Silverlight/WPF 自定义控件的数据绑定问题

不知道别人有没有遇到过这个问题，在SL里自定义了一个控件，然后搞了一堆依赖属性，但是在用到这个控件，并且给这些属性再绑定值的时候死活绑不上！

一直都对这个问题很无奈，每次都费劲巴拉的在cs里写binding，不过管用就行！

不说废话了，上代码：

首先是自定义的控件 AniItem  -〉public partial class AniItem : UserControl

给它搞了几个属性： ImgPath， ImgWidth， ImgHeight

 public string ImgPath
        {
get { return (string)GetValue(ImgPathProperty); }
set { SetValue(ImgPathProperty, value); }
        }
public static readonly DependencyProperty ImgPathProperty =
            DependencyProperty.Register("ImgPath", typeof(string), typeof(AniItem), new PropertyMetadata(null));

public double ImgWidth
        {
get { return (double)GetValue(ImgWidthProperty); }
set { SetValue(ImgWidthProperty, value); }
        }
public static readonly DependencyProperty ImgWidthProperty =
            DependencyProperty.Register("ImgWidth", typeof(double), typeof(AniItem), new PropertyMetadata(0.0));

public double ImgHeight
        {
get { return (double)GetValue(ImgHeightProperty); }
set { SetValue(ImgHeightProperty, value); }
        }
public static readonly DependencyProperty ImgHeightProperty =
            DependencyProperty.Register("ImgHeight", typeof(double), typeof(AniItem), new PropertyMetadata(0.0));

控件的样式：

  <StackPanel HorizontalAlignment="Left" Margin="0,0,0,-100" VerticalAlignment="Bottom" RenderTransformOrigin="0,0.5" x:Name="stackPanel" Grid.Row="1">
                <StackPanel.RenderTransform>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform/>
                        <TranslateTransform/>
                    </TransformGroup>
                </StackPanel.RenderTransform>
                <Image Stretch="Uniform" RenderTransformOrigin="0.5,0.5" x:Name="image" Margin="0,0,0,0">
                    <Image.RenderTransform>
                        <TransformGroup>
                            <ScaleTransform/>
                            <SkewTransform/>
                            <RotateTransform/>
                            <TranslateTransform/>
                        </TransformGroup>
                    </Image.RenderTransform>
                    <Image.OpacityMask>
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                            <GradientStop Color="#00FFFFFF" Offset="0"/>
                            <GradientStop Color="#FFFFFFFF" Offset="0.018"/>
                        </LinearGradientBrush>
                    </Image.OpacityMask>
                </Image>
                <Image Stretch="Uniform" RenderTransformOrigin="0.5,0.5" IsHitTestVisible="False" x:Name="image1" Margin="0,0,0,0">
                    <Image.OpacityMask>
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                            <GradientStop Color="#00000000" Offset="0.504"/>
                            <GradientStop Color="#00FFFFFF" Offset="1"/>
                            <GradientStop Color="#33FFFFFF" Offset="0.987"/>
                        </LinearGradientBrush>
                    </Image.OpacityMask>
                    <Image.RenderTransform>
                        <TransformGroup>
                            <ScaleTransform ScaleY="-1"/>
                            <SkewTransform/>
                            <RotateTransform/>
                            <TranslateTransform/>
                        </TransformGroup>
                    </Image.RenderTransform>
                </Image>
            </StackPanel>

如果我们把ImgPath,ImgWidth,ImgHeight都在这个xaml里绑定上，在用到这个AinItem的时候是不会成功的！

<ctr:AniItem ImgPath="{Binding ImageUrl}"   

             ImgHeight="{Binding ImageHeight}"  ImgWidth="{Binding ImageWidth}" />

接下来我们需要做的是把绑定部分写在代码里：

   public AniItem()
        {
            InitializeComponent();
this.DataContext = this;

this.SetBinding(this.image, Image.WidthProperty, "ImgWidth");
this.SetBinding(this.image, Image.HeightProperty, "ImgHeight");
this.SetBinding(this.image, Image.SourceProperty, "ImgPath");

this.SetBinding(this.image1, Image.WidthProperty, "ImgWidth");
this.SetBinding(this.image1, Image.HeightProperty, "ImgHeight");
this.SetBinding(this.image1, Image.SourceProperty, "ImgPath");

this.SetBinding(this.stackPanel, StackPanel.WidthProperty, "ImgWidth");         
        }

private void SetBinding(FrameworkElement obj, DependencyProperty p, string path)
        {
            Binding b = new Binding();
            b.Source = this;
            b.Path = new PropertyPath(path);
            b.Mode = BindingMode.OneWay;
            obj.SetBinding(p, b);
        }

这样，才能让这个自定义的控件老实干活~~

 

对了， 如果自定义的控件没有用xaml+cs，而是用的cs+style，那可以把绑定的代码放到 OnApplyTemplate里头~然后那些控件的名字可以用

GetTemplateChild(name)找到