WPF程序设计指南中的一个计算你至今活了多少年多少月多少天的例子
这个程序是第六章讲Grid布局控件的时候用到了
用了一个3行2列的grid来布局界面
这里我主要是跟大家分享下作者的算法
书中源程序如下：
//--------------------------------------------------
// CalculateYourLife.cs (c) 2006 by Charles Petzold
//--------------------------------------------------
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
namespace Petzold.CalculateYourLife
{
class CalculateYourLife : Window
{
TextBox txtboxBegin, txtboxEnd;
Label lblLifeYears;
[STAThread]
public static void Main()
{
Application app = new Application();
app.Run(new CalculateYourLife());
}
public CalculateYourLife()
{
Title = "Calculate Your Life";
SizeToContent = SizeToContent.WidthAndHeight;
ResizeMode = ResizeMode.CanMinimize;
// Create the grid.
Grid grid = new Grid();
Content = grid;
// Row and column definitions.
for (int i = 0; i < 3; i++)
{
RowDefinition rowdef = new RowDefinition();
rowdef.Height = GridLength.Auto;
grid.RowDefinitions.Add(rowdef);
}
for (int i = 0; i < 2; i++)
{
ColumnDefinition coldef = new ColumnDefinition();
coldef.Width = GridLength.Auto;
grid.ColumnDefinitions.Add(coldef);
}
// First label.
Label lbl = new Label();
lbl.Content = "Begin Date: ";
grid.Children.Add(lbl);
Grid.SetRow(lbl, 0);
Grid.SetColumn(lbl, 0);
// First TextBox.
txtboxBegin = new TextBox();
txtboxBegin.Text = new DateTime(1980, 1, 1).ToShortDateString();
txtboxBegin.TextChanged += TextBoxOnTextChanged;
grid.Children.Add(txtboxBegin);
Grid.SetRow(txtboxBegin, 0);
Grid.SetColumn(txtboxBegin, 1);
// Second label.
lbl = new Label();
lbl.Content = "End Date: ";
grid.Children.Add(lbl);
Grid.SetRow(lbl, 1);
Grid.SetColumn(lbl, 0);
// Second TextBox.
txtboxEnd = new TextBox();
txtboxEnd.TextChanged += TextBoxOnTextChanged;
grid.Children.Add(txtboxEnd);
Grid.SetRow(txtboxEnd, 1);
Grid.SetColumn(txtboxEnd, 1);
// Third label.
lbl = new Label();
lbl.Content = "Life Years: ";
grid.Children.Add(lbl);
Grid.SetRow(lbl, 2);
Grid.SetColumn(lbl, 0);
// Label for calculated result.
lblLifeYears = new Label();
grid.Children.Add(lblLifeYears);
Grid.SetRow(lblLifeYears, 2);
Grid.SetColumn(lblLifeYears, 1);
// Set margin for everybody.
Thickness thick = new Thickness(5); // ~1/20 inch.
grid.Margin = thick;
foreach (Control ctrl in grid.Children)
ctrl.Margin = thick;
// Set focus and trigger the event handler.
txtboxBegin.Focus();
txtboxEnd.Text = DateTime.Now.ToShortDateString();
}
void TextBoxOnTextChanged(object sender, TextChangedEventArgs args)
{
DateTime dtBeg, dtEnd;
if (DateTime.TryParse(txtboxBegin.Text, out dtBeg) &&
DateTime.TryParse(txtboxEnd.Text, out dtEnd))
{
int iYears = dtEnd.Year - dtBeg.Year;
int iMonths = dtEnd.Month - dtBeg.Month;
int iDays = dtEnd.Day - dtBeg.Day;
if (iDays < 0)
{
iDays += DateTime.DaysInMonth(dtEnd.Year,
1 + (dtEnd.Month + 10) % 12);
iMonths -= 1;
}
if (iMonths < 0)
{
iMonths += 12;
iYears -= 1;
}
lblLifeYears.Content =
String.Format("{0} year{1}, {2} month{3}, {4} day{5}",
iYears, iYears == 1 ? "" : "s",
iMonths, iMonths == 1 ? "" : "s",
iDays, iDays == 1 ? "" : "s");
}
else
{
lblLifeYears.Content = "";
}
}
}
}
我截图了
如下：
