一、说明
本文代码来源：
《windows phone 7 程序设计》 Charles Petzold
控件效果：
二、要点：
1.ItemControl、子项容器模板（ItemsControl.ItemsPanel）和子项模板（ItemsControl.ItemTemplate）
<ScrollViewer>
<ItemsControl ItemsSource="{Binding Students}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<local:StudentCard />
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<petzold:OverlapPanel Orientation="Vertical"
MinimumOverlap="24" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</ScrollViewer>
2.UseControl、VisualStateManager
1）.VisualStateManager必须紧跟在于UseControl*控件：
<UserControl.RenderTransform>
<TranslateTransform x:Name="translate" />
</UserControl.RenderTransform>
<!-- Border是StudentCard控件的*控件-->
<Border.....>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Open">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="translate"
Storyboard.TargetProperty="X"
To="" Duration="0:0:1" />
</Storyboard>
</VisualState>
<VisualState x:Name="Normal">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="translate"
Storyboard.TargetProperty="X"
Duration="0:0:1" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
...
</Border>
2).当依赖属性
public static readonly DependencyProperty IsOpenProperty =
DependencyProperty.Register("IsOpen",
typeof(bool),
typeof(StudentCard),
new PropertyMetadata(false, OnIsOpenChanged));
改变时就改变控件的视觉状态：
static void OnIsOpenChanged(DependencyObject obj,
DependencyPropertyChangedEventArgs args)
{
(obj as StudentCard).OnIsOpenChanged(args);
}
void OnIsOpenChanged(DependencyPropertyChangedEventArgs args)
{
VisualStateManager.GoToState(this, IsOpen ? "Open" : "Normal", false);
}
3.重写布局控件Panel中的方法：
1）. protected override Size MeasureOverride(Size availableSize);
MeasureOverride方法为该布局控件确定每个子元素的大小。
MeasureOverride调用其所有子元素的Measure方法（UIElement中定义的，密封的Sealed方法）。
各个子元素的Measure方法又调用自己的MeasureOverride，这样一直持续遍历完整棵树。
2).protected override Size ArrangeOverride(Size finalSize);
ArrangeOverride方法为该布局控件把子元素排列到相对于自身的位置。
ArrangeOverride调用其所有子元素的Arrange方法（UIElement中定义的，密封的Sealed方法）。
各个子元素的Arrange方法又调用自己的ArrangeOverride，这样一直持续遍历完整棵树。
三、源码
Mainpage.xmal:
<phone:PhoneApplicationPage
x:Class="StudentCardFile.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:elpaso="clr-namespace:ElPasoHighSchool;assembly=ElPasoHighSchool"
xmlns:petzold="clr-namespace:Petzold.Phone.Silverlight;assembly=Petzold.Phone.Silverlight"
xmlns:local="clr-namespace:StudentCardFile"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="" d:DesignHeight=""
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True"> <phone:PhoneApplicationPage.Resources>
<elpaso:StudentBodyPresenter x:Key="studentBodyPresenter" />
</phone:PhoneApplicationPage.Resources> <!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions> <!--TitlePanel contains the name of the application and page title-->
<StackPanel x:Name="TitlePanel" Grid.Row="" Margin="12,17,0,28">
<TextBlock x:Name="ApplicationTitle" Text="STUDENT CARD FILE" Style="{StaticResource PhoneTextNormalStyle}"/>
</StackPanel> <!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Grid.Row="" Margin="12,0,12,0"
DataContext="{Binding Source={StaticResource studentBodyPresenter},
Path=StudentBody}">
<ScrollViewer>
<ItemsControl ItemsSource="{Binding Students}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<local:StudentCard />
</DataTemplate>
</ItemsControl.ItemTemplate> <ItemsControl.ItemsPanel>
<ItemsPanelTemplate> <petzold:OverlapPanel Orientation="Vertical"
MinimumOverlap="" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl> </ScrollViewer> </Grid>
</Grid> <!--Sample code showing usage of ApplicationBar-->
<!--<phone:PhoneApplicationPage.ApplicationBar>
<shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
<shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="Button 1"/>
<shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="Button 2"/>
<shell:ApplicationBar.MenuItems>
<shell:ApplicationBarMenuItem Text="MenuItem 1"/>
<shell:ApplicationBarMenuItem Text="MenuItem 2"/>
</shell:ApplicationBar.MenuItems>
</shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar>--> </phone:PhoneApplicationPage>
StudentCard.xaml
<UserControl x:Class="StudentCardFile.StudentCard"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
Width="" Height=""> <UserControl.RenderTransform>
<TranslateTransform x:Name="translate" />
</UserControl.RenderTransform> <Border BorderBrush="{StaticResource PhoneAccentBrush}"
BorderThickness=""
Background="{StaticResource PhoneChromeBrush}"
CornerRadius=""
Padding="6 0"> <VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Open">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="translate"
Storyboard.TargetProperty="X"
To="" Duration="0:0:1" />
</Storyboard>
</VisualState> <VisualState x:Name="Normal">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="translate"
Storyboard.TargetProperty="X"
Duration="0:0:1" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups> <Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions> <TextBlock Grid.Row=""
Text="{Binding FullName}" /> <Rectangle Grid.Row=""
Fill="{StaticResource PhoneAccentBrush}"
Height=""
Margin="0 0 0 4" /> <Image Grid.Row=""
Source="{Binding PhotoFilename}" /> <StackPanel Grid.Row=""
Orientation="Horizontal"
HorizontalAlignment="Center">
<TextBlock Text="GPA = " />
<TextBlock Text="{Binding GradePointAverage}" />
</StackPanel>
</Grid>
</Border>
</UserControl>
StudentCard.xaml.cs
using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media; namespace StudentCardFile
{
public partial class StudentCard : UserControl
{
static List<StudentCard> studentCards = new List<StudentCard>();
static int contactTime;
static Point contactPoint; public static readonly DependencyProperty IsOpenProperty =
DependencyProperty.Register("IsOpen",
typeof(bool),
typeof(StudentCard),
new PropertyMetadata(false, OnIsOpenChanged)); static StudentCard()
{
Touch.FrameReported += OnTouchFrameReported;
} static void OnIsOpenChanged(DependencyObject obj,
DependencyPropertyChangedEventArgs args)
{
(obj as StudentCard).OnIsOpenChanged(args);
} static void OnTouchFrameReported(object sender, TouchFrameEventArgs args)
{
TouchPoint touchPoint = args.GetPrimaryTouchPoint(null); if (touchPoint != null && touchPoint.Action == TouchAction.Down)
{
contactPoint = touchPoint.Position;
contactTime = args.Timestamp;
}
else if (touchPoint != null && touchPoint.Action == TouchAction.Up)
{
// Check if finger is directly over StudentCard or child
DependencyObject element = touchPoint.TouchDevice.DirectlyOver; while (element != null && !(element is StudentCard))
element = VisualTreeHelper.GetParent(element); if (element == null)
return; // Get lift point and calculate difference
Point liftPoint = touchPoint.Position;
double distance = Math.Sqrt(Math.Pow(contactPoint.X - liftPoint.X, ) +
Math.Pow(contactPoint.Y - liftPoint.Y, )); // Qualify as a Tap if distance < 12 pixels within 1/4 second
if (distance < && args.Timestamp - contactTime < )
{
// Enumerate StudentCard objects and set IsOpen property
foreach (StudentCard studentCard in studentCards)
studentCard.IsOpen = (element == studentCard && !studentCard.IsOpen);
}
}
} public StudentCard()
{
InitializeComponent();
studentCards.Add(this);
} bool IsOpen
{
set { SetValue(IsOpenProperty, value); }
get { return (bool)GetValue(IsOpenProperty); }
} void OnIsOpenChanged(DependencyPropertyChangedEventArgs args)
{
VisualStateManager.GoToState(this, IsOpen ? "Open" : "Normal", false);
}
}
}
用反射工具得到布局控件OverlapPanel的代码：
public class OverlapPanel : Panel
{
// Fields
private Size maxChildSize = new Size();
public static readonly DependencyProperty MinimumOverlapProperty = DependencyProperty.Register("MinimumOverlap", typeof(double), typeof(OverlapPanel), new PropertyMetadata(0.0, new PropertyChangedCallback(null, (IntPtr) OnAffectsMeasure)));
public static readonly DependencyProperty OrientationProperty = DependencyProperty.Register("Orientation", typeof(Orientation), typeof(OverlapPanel), new PropertyMetadata((Orientation) , new PropertyChangedCallback(null, (IntPtr) OnAffectsMeasure))); // Methods
protected override Size ArrangeOverride(Size finalSize)
{
if (base.get_Children().get_Count() != )
{
double num = 0.0;
if (this.Orientation == )
{
num = Math.Max(this.MinimumOverlap, (finalSize.get_Width() - this.maxChildSize.get_Width()) / ((double) (base.get_Children().get_Count() - )));
}
else
{
num = Math.Max(this.MinimumOverlap, (finalSize.get_Height() - this.maxChildSize.get_Height()) / ((double) (base.get_Children().get_Count() - )));
}
Point point = new Point();
foreach (UIElement element in base.get_Children())
{
element.Arrange(new Rect(point, this.maxChildSize));
if (this.Orientation == )
{
point.set_X(point.get_X() + num);
}
else
{
point.set_Y(point.get_Y() + num);
}
}
}
return finalSize;
} protected override Size MeasureOverride(Size availableSize)
{
if (base.get_Children().get_Count() == )
{
return new Size(0.0, 0.0);
}
this.maxChildSize = new Size();
foreach (UIElement element in base.get_Children())
{
if (this.Orientation == )
{
element.Measure(new Size(double.PositiveInfinity, availableSize.get_Height()));
}
else
{
element.Measure(new Size(availableSize.get_Width(), double.PositiveInfinity));
}
this.maxChildSize.set_Width(Math.Max(this.maxChildSize.get_Width(), element.get_DesiredSize().get_Width()));
this.maxChildSize.set_Height(Math.Max(this.maxChildSize.get_Height(), element.get_DesiredSize().get_Height()));
}
if (this.Orientation == )
{
double num = this.maxChildSize.get_Width() * base.get_Children().get_Count();
double num2 = this.maxChildSize.get_Width() + (this.MinimumOverlap * (base.get_Children().get_Count() - ));
if (!double.IsPositiveInfinity(availableSize.get_Width()))
{
if (num < availableSize.get_Width())
{
return new Size(num, this.maxChildSize.get_Height());
}
if (num2 < availableSize.get_Width())
{
return new Size(availableSize.get_Width(), this.maxChildSize.get_Height());
}
}
return new Size(num2, this.maxChildSize.get_Height());
}
double num3 = this.maxChildSize.get_Height() * base.get_Children().get_Count();
double num4 = this.maxChildSize.get_Height() + (this.MinimumOverlap * (base.get_Children().get_Count() - ));
if (double.IsPositiveInfinity(availableSize.get_Height()))
{
return new Size(this.maxChildSize.get_Width(), num4);
}
if (num3 < availableSize.get_Height())
{
return new Size(this.maxChildSize.get_Width(), num3);
}
if (num4 < availableSize.get_Height())
{
return new Size(this.maxChildSize.get_Width(), availableSize.get_Height());
}
return new Size(this.maxChildSize.get_Width(), num4);
} private static void OnAffectsMeasure(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
(obj as OverlapPanel).InvalidateMeasure();
} // Properties
public double MinimumOverlap
{
get
{
return (double) base.GetValue(MinimumOverlapProperty);
}
set
{
base.SetValue(MinimumOverlapProperty, value);
}
} public Orientation Orientation
{
get
{
return (Orientation) base.GetValue(OrientationProperty);
}
set
{
base.SetValue(OrientationProperty, value);
}
}
} Collapse Methods
四、MainPage.xmal中的数据源：
。。。
xmlns:elpaso="clr-namespace:ElPasoHighSchool;assembly=ElPasoHighSchool"
。。。
<phone:PhoneApplicationPage.Resources>
<elpaso:StudentBodyPresenter x:Key="studentBodyPresenter" />
</phone:PhoneApplicationPage.Resources>
ElPasoHighSchool.dll 反射工具得到如下用到得类：
Student.c
public class Student : INotifyPropertyChanged
{
// Fields
private string firstName;
private string fullName;
private decimal gradePointAverage;
private string lastName;
private string middleName;
private string photoFilename;
private PropertyChangedEventHandler PropertyChanged;
private string sex; // Events
public event PropertyChangedEventHandler PropertyChanged
{
add
{
PropertyChangedEventHandler handler2;
PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
do
{
handler2 = propertyChanged;
PropertyChangedEventHandler handler3 = (PropertyChangedEventHandler) Delegate.Combine(handler2, value);
propertyChanged = Interlocked.CompareExchange<PropertyChangedEventHandler>(ref this.PropertyChanged, handler3, handler2);
}
while (propertyChanged != handler2);
}
remove
{
PropertyChangedEventHandler handler2;
PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
do
{
handler2 = propertyChanged;
PropertyChangedEventHandler handler3 = (PropertyChangedEventHandler) Delegate.Remove(handler2, value);
propertyChanged = Interlocked.CompareExchange<PropertyChangedEventHandler>(ref this.PropertyChanged, handler3, handler2);
}
while (propertyChanged != handler2);
}
} // Methods
protected virtual void OnPropertyChanged(string propChanged)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propChanged));
}
} // Properties
public string FirstName
{
get
{
return this.firstName;
}
set
{
if (this.firstName != value)
{
this.firstName = value;
this.OnPropertyChanged("FirstName");
}
}
} public string FullName
{
get
{
return this.fullName;
}
set
{
if (this.fullName != value)
{
this.fullName = value;
this.OnPropertyChanged("FullName");
}
}
} public decimal GradePointAverage
{
get
{
return this.gradePointAverage;
}
set
{
if (this.gradePointAverage != value)
{
this.gradePointAverage = value;
this.OnPropertyChanged("GradePointAverage");
}
}
} public string LastName
{
get
{
return this.lastName;
}
set
{
if (this.lastName != value)
{
this.lastName = value;
this.OnPropertyChanged("LastName");
}
}
} public string MiddleName
{
get
{
return this.middleName;
}
set
{
if (this.middleName != value)
{
this.middleName = value;
this.OnPropertyChanged("MiddleName");
}
}
} public string PhotoFilename
{
get
{
return this.photoFilename;
}
set
{
if (this.photoFilename != value)
{
this.photoFilename = value;
this.OnPropertyChanged("PhotoFilename");
}
}
} public string Sex
{
get
{
return this.sex;
}
set
{
if (this.sex != value)
{
this.sex = value;
this.OnPropertyChanged("Sex");
}
}
}
} Collapse Methods
StudentBody.cs
public class StudentBody : INotifyPropertyChanged
{
// Fields
private PropertyChangedEventHandler PropertyChanged;
private string school;
private ObservableCollection<Student> students = new ObservableCollection<Student>(); // Events
public event PropertyChangedEventHandler PropertyChanged
{
add
{
PropertyChangedEventHandler handler2;
PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
do
{
handler2 = propertyChanged;
PropertyChangedEventHandler handler3 = (PropertyChangedEventHandler) Delegate.Combine(handler2, value);
propertyChanged = Interlocked.CompareExchange<PropertyChangedEventHandler>(ref this.PropertyChanged, handler3, handler2);
}
while (propertyChanged != handler2);
}
remove
{
PropertyChangedEventHandler handler2;
PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
do
{
handler2 = propertyChanged;
PropertyChangedEventHandler handler3 = (PropertyChangedEventHandler) Delegate.Remove(handler2, value);
propertyChanged = Interlocked.CompareExchange<PropertyChangedEventHandler>(ref this.PropertyChanged, handler3, handler2);
}
while (propertyChanged != handler2);
}
} // Methods
protected virtual void OnPropertyChanged(string propChanged)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propChanged));
}
} // Properties
public string School
{
get
{
return this.school;
}
set
{
if (this.school != value)
{
this.school = value;
this.OnPropertyChanged("School");
}
}
} public ObservableCollection<Student> Students
{
get
{
return this.students;
}
set
{
if (this.students != value)
{
this.students = value;
this.OnPropertyChanged("Students");
}
}
}
} Collapse Methods
public class StudentBodyPresenter : INotifyPropertyChanged
{
// Fields
private PropertyChangedEventHandler PropertyChanged;
private Random rand = new Random();
private StudentBody studentBody; // Events
public event PropertyChangedEventHandler PropertyChanged
{
add
{
PropertyChangedEventHandler handler2;
PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
do
{
handler2 = propertyChanged;
PropertyChangedEventHandler handler3 = (PropertyChangedEventHandler) Delegate.Combine(handler2, value);
propertyChanged = Interlocked.CompareExchange<PropertyChangedEventHandler>(ref this.PropertyChanged, handler3, handler2);
}
while (propertyChanged != handler2);
}
remove
{
PropertyChangedEventHandler handler2;
PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
do
{
handler2 = propertyChanged;
PropertyChangedEventHandler handler3 = (PropertyChangedEventHandler) Delegate.Remove(handler2, value);
propertyChanged = Interlocked.CompareExchange<PropertyChangedEventHandler>(ref this.PropertyChanged, handler3, handler2);
}
while (propertyChanged != handler2);
}
} // Methods
public StudentBodyPresenter()
{
Uri uri = new Uri("http://www.charlespetzold.com/Students/students.xml");
WebClient client = new WebClient();
client.add_DownloadStringCompleted(new DownloadStringCompletedEventHandler(this, (IntPtr) this.OnDownloadStringCompleted));
client.DownloadStringAsync(uri);
} private void OnDownloadStringCompleted(object sender, DownloadStringCompletedEventArgs args)
{
StringReader reader = new StringReader(args.get_Result());
XmlSerializer serializer = new XmlSerializer(typeof(StudentBody));
this.StudentBody = serializer.Deserialize(reader) as StudentBody;
DispatcherTimer timer = new DispatcherTimer();
timer.add_Tick(new EventHandler(this.TimerOnTick));
timer.set_Interval(TimeSpan.FromMilliseconds(100.0));
timer.Start();
} protected virtual void OnPropertyChanged(string propChanged)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propChanged));
}
} private void TimerOnTick(object sender, EventArgs args)
{
int num = this.rand.Next(this.studentBody.Students.Count);
Student student = this.studentBody.Students[num];
double num2 = 1.0 + ((this.rand.NextDouble() - 0.5) / 5.0);
student.GradePointAverage = Math.Max(0M, Math.Min(5M, decimal.Round(((decimal) num2) * student.GradePointAverage, )));
} // Properties
public StudentBody StudentBody
{
get
{
return this.studentBody;
}
protected set
{
if (this.studentBody != value)
{
this.studentBody = value;
this.OnPropertyChanged("StudentBody");
}
}
}
} Collapse Methods
要点：
1）.数据是存在一个名为students.xml，地址为：
http://www.charlespetzold.com/Students/students.xml
students.xml:
<?xml version="1.0" encoding="utf-8" ?>
- <StudentBody xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<School>El Paso High School</School>
- <Students>
- <Student>
<FullName>Adkins Bowden</FullName>
<FirstName>Adkins</FirstName>
<MiddleName />
<LastName>Bowden</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/AdkinsBowden.png</PhotoFilename>
<GradePointAverage>2.71</GradePointAverage>
</Student>
- <Student>
<FullName>Alfred Black</FullName>
<FirstName>Alfred</FirstName>
<MiddleName />
<LastName>Black</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/AlfredBlack.png</PhotoFilename>
<GradePointAverage>2.87</GradePointAverage>
</Student>
- <Student>
<FullName>Alice Bishop</FullName>
<FirstName>Alice</FirstName>
<MiddleName />
<LastName>Bishop</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/AliceBishop.png</PhotoFilename>
<GradePointAverage>3.68</GradePointAverage>
</Student>
- <Student>
<FullName>Alma Hermine Morrison</FullName>
<FirstName>Alma</FirstName>
<MiddleName>Hermine</MiddleName>
<LastName>Morrison</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/AlmaHermineMorrison.png</PhotoFilename>
<GradePointAverage>1.99</GradePointAverage>
</Student>
- <Student>
<FullName>Angie Foster</FullName>
<FirstName>Angie</FirstName>
<MiddleName />
<LastName>Foster</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/AngieFoster.png</PhotoFilename>
<GradePointAverage>1.37</GradePointAverage>
</Student>
- <Student>
<FullName>Antoinette Matkin</FullName>
<FirstName>Antoinette</FirstName>
<MiddleName />
<LastName>Matkin</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/AntoinetteMatkin.png</PhotoFilename>
<GradePointAverage>1.17</GradePointAverage>
</Student>
- <Student>
<FullName>Barbara Byers</FullName>
<FirstName>Barbara</FirstName>
<MiddleName />
<LastName>Byers</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/BarbaraByers.png</PhotoFilename>
<GradePointAverage>1.85</GradePointAverage>
</Student>
- <Student>
<FullName>Bernadine Wilma Schultz</FullName>
<FirstName>Bernadine</FirstName>
<MiddleName>Wilma</MiddleName>
<LastName>Schultz</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/BernadineWilmaSchultz.png</PhotoFilename>
<GradePointAverage>3.65</GradePointAverage>
</Student>
- <Student>
<FullName>Bernita Thomas</FullName>
<FirstName>Bernita</FirstName>
<MiddleName />
<LastName>Thomas</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/BernitaThomas.png</PhotoFilename>
<GradePointAverage>1.96</GradePointAverage>
</Student>
- <Student>
<FullName>Camille Kibler</FullName>
<FirstName>Camille</FirstName>
<MiddleName />
<LastName>Kibler</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/CamilleKibler.png</PhotoFilename>
<GradePointAverage>2.54</GradePointAverage>
</Student>
- <Student>
<FullName>Charles Carter</FullName>
<FirstName>Charles</FirstName>
<MiddleName />
<LastName>Carter</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/CharlesCarter.png</PhotoFilename>
<GradePointAverage>1.12</GradePointAverage>
</Student>
- <Student>
<FullName>Charles Edgar Virden</FullName>
<FirstName>Charles</FirstName>
<MiddleName>Edgar</MiddleName>
<LastName>Virden</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/CharlesEdgarVirden.png</PhotoFilename>
<GradePointAverage>2.28</GradePointAverage>
</Student>
- <Student>
<FullName>Charles Kilburn</FullName>
<FirstName>Charles</FirstName>
<MiddleName />
<LastName>Kilburn</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/CharlesKilburn.png</PhotoFilename>
<GradePointAverage>1.72</GradePointAverage>
</Student>
- <Student>
<FullName>Christian Jungjohann</FullName>
<FirstName>Christian</FirstName>
<MiddleName />
<LastName>Jungjohann</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ChristianJungjohann.png</PhotoFilename>
<GradePointAverage>3.73</GradePointAverage>
</Student>
- <Student>
<FullName>Christina Moelich</FullName>
<FirstName>Christina</FirstName>
<MiddleName />
<LastName>Moelich</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ChristinaMoelich.png</PhotoFilename>
<GradePointAverage>2.41</GradePointAverage>
</Student>
- <Student>
<FullName>Clara Louise Fink</FullName>
<FirstName>Clara</FirstName>
<MiddleName>Louise</MiddleName>
<LastName>Fink</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ClaraLouiseFink.png</PhotoFilename>
<GradePointAverage>3.21</GradePointAverage>
</Student>
- <Student>
<FullName>Clarinda Corbin</FullName>
<FirstName>Clarinda</FirstName>
<MiddleName />
<LastName>Corbin</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ClarindaCorbin.png</PhotoFilename>
<GradePointAverage>2.73</GradePointAverage>
</Student>
- <Student>
<FullName>Dayverne Stearns</FullName>
<FirstName>Dayverne</FirstName>
<MiddleName />
<LastName>Stearns</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/DayverneStearns.png</PhotoFilename>
<GradePointAverage>1.28</GradePointAverage>
</Student>
- <Student>
<FullName>Dorothy Congdon</FullName>
<FirstName>Dorothy</FirstName>
<MiddleName />
<LastName>Congdon</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/DorothyCongdon.png</PhotoFilename>
<GradePointAverage>2.07</GradePointAverage>
</Student>
- <Student>
<FullName>Earl Weisiger</FullName>
<FirstName>Earl</FirstName>
<MiddleName />
<LastName>Weisiger</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/EarlWeisiger.png</PhotoFilename>
<GradePointAverage>1.28</GradePointAverage>
</Student>
- <Student>
<FullName>Edna Richardson</FullName>
<FirstName>Edna</FirstName>
<MiddleName />
<LastName>Richardson</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/EdnaRichardson.png</PhotoFilename>
<GradePointAverage>2.39</GradePointAverage>
</Student>
- <Student>
<FullName>Eldon Routledge</FullName>
<FirstName>Eldon</FirstName>
<MiddleName />
<LastName>Routledge</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/EldonRoutledge.png</PhotoFilename>
<GradePointAverage>3.26</GradePointAverage>
</Student>
- <Student>
<FullName>Elgie Means</FullName>
<FirstName>Elgie</FirstName>
<MiddleName />
<LastName>Means</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ElgieMeans.png</PhotoFilename>
<GradePointAverage>1.16</GradePointAverage>
</Student>
- <Student>
<FullName>Elizabeth Barnes</FullName>
<FirstName>Elizabeth</FirstName>
<MiddleName />
<LastName>Barnes</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ElizabethBarnes.png</PhotoFilename>
<GradePointAverage>3.68</GradePointAverage>
</Student>
- <Student>
<FullName>Elizabeth Bruce Lucas</FullName>
<FirstName>Elizabeth</FirstName>
<MiddleName>Bruce</MiddleName>
<LastName>Lucas</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ElizabethBruceLucas.png</PhotoFilename>
<GradePointAverage>3.43</GradePointAverage>
</Student>
- <Student>
<FullName>Elizabeth Routledge</FullName>
<FirstName>Elizabeth</FirstName>
<MiddleName />
<LastName>Routledge</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ElizabethRoutledge.png</PhotoFilename>
<GradePointAverage>3.86</GradePointAverage>
</Student>
- <Student>
<FullName>Eugene Smith</FullName>
<FirstName>Eugene</FirstName>
<MiddleName />
<LastName>Smith</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/EugeneSmith.png</PhotoFilename>
<GradePointAverage>3.92</GradePointAverage>
</Student>
- <Student>
<FullName>Eunice Anderson</FullName>
<FirstName>Eunice</FirstName>
<MiddleName />
<LastName>Anderson</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/EuniceAnderson.png</PhotoFilename>
<GradePointAverage>3.96</GradePointAverage>
</Student>
- <Student>
<FullName>Eunice Winifred Preston</FullName>
<FirstName>Eunice</FirstName>
<MiddleName>Winifred</MiddleName>
<LastName>Preston</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/EuniceWinifredPreston.png</PhotoFilename>
<GradePointAverage>2.70</GradePointAverage>
</Student>
- <Student>
<FullName>George Johnston</FullName>
<FirstName>George</FirstName>
<MiddleName />
<LastName>Johnston</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/GeorgeJohnston.png</PhotoFilename>
<GradePointAverage>1.07</GradePointAverage>
</Student>
- <Student>
<FullName>Grace Fleck</FullName>
<FirstName>Grace</FirstName>
<MiddleName />
<LastName>Fleck</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/GraceFleck.png</PhotoFilename>
<GradePointAverage>1.96</GradePointAverage>
</Student>
- <Student>
<FullName>Harry Stearns</FullName>
<FirstName>Harry</FirstName>
<MiddleName />
<LastName>Stearns</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/HarryStearns.png</PhotoFilename>
<GradePointAverage>3.61</GradePointAverage>
</Student>
- <Student>
<FullName>Henry Avery Schumacher</FullName>
<FirstName>Henry</FirstName>
<MiddleName>Avery</MiddleName>
<LastName>Schumacher</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/HenryAverySchumacher.png</PhotoFilename>
<GradePointAverage>1.31</GradePointAverage>
</Student>
- <Student>
<FullName>Idus Gilbert</FullName>
<FirstName>Idus</FirstName>
<MiddleName />
<LastName>Gilbert</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/IdusGilbert.png</PhotoFilename>
<GradePointAverage>1.23</GradePointAverage>
</Student>
- <Student>
<FullName>Irene Bryan</FullName>
<FirstName>Irene</FirstName>
<MiddleName />
<LastName>Bryan</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/IreneBryan.png</PhotoFilename>
<GradePointAverage>2.52</GradePointAverage>
</Student>
- <Student>
<FullName>Isabelle Valentine</FullName>
<FirstName>Isabelle</FirstName>
<MiddleName />
<LastName>Valentine</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/IsabelleValentine.png</PhotoFilename>
<GradePointAverage>2.80</GradePointAverage>
</Student>
- <Student>
<FullName>Joseph Idus Lambert</FullName>
<FirstName>Joseph</FirstName>
<MiddleName>Idus</MiddleName>
<LastName>Lambert</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/JosephIdusLambert.png</PhotoFilename>
<GradePointAverage>2.13</GradePointAverage>
</Student>
- <Student>
<FullName>Kate Mulcahy</FullName>
<FirstName>Kate</FirstName>
<MiddleName />
<LastName>Mulcahy</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/KateMulcahy.png</PhotoFilename>
<GradePointAverage>2.80</GradePointAverage>
</Student>
- <Student>
<FullName>Katherine Glenn</FullName>
<FirstName>Katherine</FirstName>
<MiddleName />
<LastName>Glenn</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/KatherineGlenn.png</PhotoFilename>
<GradePointAverage>1.88</GradePointAverage>
</Student>
- <Student>
<FullName>Kathleen Elizabeth Faris</FullName>
<FirstName>Kathleen</FirstName>
<MiddleName>Elizabeth</MiddleName>
<LastName>Faris</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/KathleenElizabethFaris.png</PhotoFilename>
<GradePointAverage>2.69</GradePointAverage>
</Student>
- <Student>
<FullName>Lena Butchofsky</FullName>
<FirstName>Lena</FirstName>
<MiddleName />
<LastName>Butchofsky</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/LenaButchofsky.png</PhotoFilename>
<GradePointAverage>2.72</GradePointAverage>
</Student>
- <Student>
<FullName>Lillian Lockwood</FullName>
<FirstName>Lillian</FirstName>
<MiddleName />
<LastName>Lockwood</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/LillianLockwood.png</PhotoFilename>
<GradePointAverage>1.07</GradePointAverage>
</Student>
- <Student>
<FullName>Louise Isabelle Springer</FullName>
<FirstName>Louise</FirstName>
<MiddleName>Isabelle</MiddleName>
<LastName>Springer</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/LouiseIsabelleSpringer.png</PhotoFilename>
<GradePointAverage>1.66</GradePointAverage>
</Student>
- <Student>
<FullName>Lucas Bacon</FullName>
<FirstName>Lucas</FirstName>
<MiddleName />
<LastName>Bacon</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/LucasBacon.png</PhotoFilename>
<GradePointAverage>1.17</GradePointAverage>
</Student>
- <Student>
<FullName>Margaret Bryan</FullName>
<FirstName>Margaret</FirstName>
<MiddleName />
<LastName>Bryan</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MargaretBryan.png</PhotoFilename>
<GradePointAverage>3.21</GradePointAverage>
</Student>
- <Student>
<FullName>Maria Mateus</FullName>
<FirstName>Maria</FirstName>
<MiddleName />
<LastName>Mateus</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MariaMateus.png</PhotoFilename>
<GradePointAverage>3.92</GradePointAverage>
</Student>
- <Student>
<FullName>Marie Schwartz</FullName>
<FirstName>Marie</FirstName>
<MiddleName />
<LastName>Schwartz</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MarieSchwartz.png</PhotoFilename>
<GradePointAverage>3.53</GradePointAverage>
</Student>
- <Student>
<FullName>Mary Frances Henderson</FullName>
<FirstName>Mary</FirstName>
<MiddleName>Frances</MiddleName>
<LastName>Henderson</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MaryFrancesHenderson.png</PhotoFilename>
<GradePointAverage>3.91</GradePointAverage>
</Student>
- <Student>
<FullName>Mary Keating</FullName>
<FirstName>Mary</FirstName>
<MiddleName />
<LastName>Keating</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MaryKeating.png</PhotoFilename>
<GradePointAverage>3.53</GradePointAverage>
</Student>
- <Student>
<FullName>Mary Redmond</FullName>
<FirstName>Mary</FirstName>
<MiddleName />
<LastName>Redmond</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MaryRedmond.png</PhotoFilename>
<GradePointAverage>3.51</GradePointAverage>
</Student>
- <Student>
<FullName>Mattie Clark</FullName>
<FirstName>Mattie</FirstName>
<MiddleName />
<LastName>Clark</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MattieClark.png</PhotoFilename>
<GradePointAverage>1.98</GradePointAverage>
</Student>
- <Student>
<FullName>Mildred Helen Marston</FullName>
<FirstName>Mildred</FirstName>
<MiddleName>Helen</MiddleName>
<LastName>Marston</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MildredHelenMarston.png</PhotoFilename>
<GradePointAverage>2.70</GradePointAverage>
</Student>
- <Student>
<FullName>Mineta Henning</FullName>
<FirstName>Mineta</FirstName>
<MiddleName />
<LastName>Henning</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MinetaHenning.png</PhotoFilename>
<GradePointAverage>2.71</GradePointAverage>
</Student>
- <Student>
<FullName>Minnie Lee Lassiter</FullName>
<FirstName>Minnie</FirstName>
<MiddleName>Lee</MiddleName>
<LastName>Lassiter</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MinnieLeeLassiter.png</PhotoFilename>
<GradePointAverage>1.26</GradePointAverage>
</Student>
- <Student>
<FullName>Moline Lopas Hughes</FullName>
<FirstName>Moline</FirstName>
<MiddleName>Lopas</MiddleName>
<LastName>Hughes</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/MolineLopasHughes.png</PhotoFilename>
<GradePointAverage>1.79</GradePointAverage>
</Student>
- <Student>
<FullName>Nannie Hammons</FullName>
<FirstName>Nannie</FirstName>
<MiddleName />
<LastName>Hammons</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/NannieHammons.png</PhotoFilename>
<GradePointAverage>1.70</GradePointAverage>
</Student>
- <Student>
<FullName>Nell Mulcahy</FullName>
<FirstName>Nell</FirstName>
<MiddleName />
<LastName>Mulcahy</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/NellMulcahy.png</PhotoFilename>
<GradePointAverage>2.33</GradePointAverage>
</Student>
- <Student>
<FullName>Nelson Rheinheimer</FullName>
<FirstName>Nelson</FirstName>
<MiddleName />
<LastName>Rheinheimer</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/NelsonRheinheimer.png</PhotoFilename>
<GradePointAverage>3.56</GradePointAverage>
</Student>
- <Student>
<FullName>Opal Edson Hadlock</FullName>
<FirstName>Opal</FirstName>
<MiddleName>Edson</MiddleName>
<LastName>Hadlock</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/OpalEdsonHadlock.png</PhotoFilename>
<GradePointAverage>2.42</GradePointAverage>
</Student>
- <Student>
<FullName>Ralph O'Neill</FullName>
<FirstName>Ralph</FirstName>
<MiddleName />
<LastName>O'Neill</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/RalphO'Neill.png</PhotoFilename>
<GradePointAverage>3.18</GradePointAverage>
</Student>
- <Student>
<FullName>Ramiel Jungjohann</FullName>
<FirstName>Ramiel</FirstName>
<MiddleName />
<LastName>Jungjohann</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/RamielJungjohann.png</PhotoFilename>
<GradePointAverage>3.90</GradePointAverage>
</Student>
- <Student>
<FullName>Reed Harlan</FullName>
<FirstName>Reed</FirstName>
<MiddleName />
<LastName>Harlan</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ReedHarlan.png</PhotoFilename>
<GradePointAverage>3.46</GradePointAverage>
</Student>
- <Student>
<FullName>Rose Clayton</FullName>
<FirstName>Rose</FirstName>
<MiddleName />
<LastName>Clayton</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/RoseClayton.png</PhotoFilename>
<GradePointAverage>2.11</GradePointAverage>
</Student>
- <Student>
<FullName>Ross Hill</FullName>
<FirstName>Ross</FirstName>
<MiddleName />
<LastName>Hill</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/RossHill.png</PhotoFilename>
<GradePointAverage>2.83</GradePointAverage>
</Student>
- <Student>
<FullName>Ruy Darnall</FullName>
<FirstName>Ruy</FirstName>
<MiddleName />
<LastName>Darnall</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/RuyDarnall.png</PhotoFilename>
<GradePointAverage>1.75</GradePointAverage>
</Student>
- <Student>
<FullName>Steve Lattner</FullName>
<FirstName>Steve</FirstName>
<MiddleName />
<LastName>Lattner</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/SteveLattner.png</PhotoFilename>
<GradePointAverage>2.44</GradePointAverage>
</Student>
- <Student>
<FullName>Therese Youngberg</FullName>
<FirstName>Therese</FirstName>
<MiddleName />
<LastName>Youngberg</LastName>
<Sex>Female</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/ThereseYoungberg.png</PhotoFilename>
<GradePointAverage>2.95</GradePointAverage>
</Student>
- <Student>
<FullName>Walter Ponsford</FullName>
<FirstName>Walter</FirstName>
<MiddleName />
<LastName>Ponsford</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/WalterPonsford.png</PhotoFilename>
<GradePointAverage>2.52</GradePointAverage>
</Student>
- <Student>
<FullName>William Sheley Warnock</FullName>
<FirstName>William</FirstName>
<MiddleName>Sheley</MiddleName>
<LastName>Warnock</LastName>
<Sex>Male</Sex>
<PhotoFilename>http://www.charlespetzold.com/Students/WilliamSheleyWarnock.png</PhotoFilename>
<GradePointAverage>1.82</GradePointAverage>
</Student>
</Students>
</StudentBody>
用到如下方法获得xml文件：
public StudentBodyPresenter()
{
Uri uri = new Uri("http://www.charlespetzold.com/Students/students.xml");
WebClient client = new WebClient();
client.add_DownloadStringCompleted(new DownloadStringCompletedEventHandler(this, (IntPtr) this.OnDownloadStringCompleted));
client.DownloadStringAsync(uri);
}
2）.然后用反序列化得到StudentBody对象：
private void OnDownloadStringCompleted(object sender, DownloadStringCompletedEventArgs args)
{
StringReader reader = new StringReader(args.get_Result());
XmlSerializer serializer = new XmlSerializer(typeof(StudentBody));
this.StudentBody = serializer.Deserialize(reader) as StudentBody;
DispatcherTimer timer = new DispatcherTimer();
timer.add_Tick(new EventHandler(this.TimerOnTick));
timer.set_Interval(TimeSpan.FromMilliseconds(100.0));
timer.Start();
} private void TimerOnTick(object sender, EventArgs args)
{
int num = this.rand.Next(this.studentBody.Students.Count);
Student student = this.studentBody.Students[num];
double num2 = 1.0 + ((this.rand.NextDouble() - 0.5) / 5.0);
student.GradePointAverage = Math.Max(0M, Math.Min(5M, decimal.Round(((decimal) num2) * student.GradePointAverage, )));
}
StudentBody用private ObservableCollection<Student> students;保存所有的Student对象，反序列化时，students得到赋值。