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绑定不工作…(WPF)“x:Name”问题?

binding wpf

1

serhio · 技术社区 · 15 年前

我有两个按钮,需要用一条线把它们连接起来。我将线坐标绑定到按钮位置。

我需要通过代码添加这个绑定。

在XAML中,这项工作非常好,如下所示:

<Button x:Name="button1" Width="10" Height="10" Canvas.Left="150"  Canvas.Top="150"/>
<Button x:Name="button2" Width="10" Height="10" Canvas.Left="250"  Canvas.Top="100"/>

<Line x:Name="testLine" Stroke="Black"
      X1="{Binding ElementName=button1, Path=(Canvas.Left)}"
      Y1="{Binding ElementName=button1, Path=(Canvas.Top)}"
      X2="{Binding ElementName=button2, Path=(Canvas.Left)}"
      Y2="{Binding ElementName=button2, Path=(Canvas.Top)}"/>

现在,在代码中,我尝试:

    Binding b = new Binding("(Canvas.Left)");
    b.ElementName = "button1";
    testLine.SetBinding(System.Windows.Shapes.Line.X1Property, "(Canvas.Left)");

但这不起作用。。。(

编辑:

动态创建元素时有一个问题:

Button button1 = new Button();
Canvas.SetLeft(button1, 50);
Canvas.SetTop(button1, 50);
button1.Name = "be1";
mainCanvas.Children.Add(button1);

Button button2 = new Button();
Canvas.SetLeft(button2, 150);
Canvas.SetTop(button2, 150);
button2.Name = "be2";
mainCanvas.Children.Add(button2);

Binding b1 = new Binding() { ElementName = "be1", Path = new PropertyPath("(Canvas.Left)") };
Binding b2 = new Binding() { ElementName = "be2", Path = new PropertyPath("(Canvas.Left)") };

testLine.SetBinding(System.Windows.Shapes.Line.X1Property, b1);
testLine.SetBinding(System.Windows.Shapes.Line.X2Property, b2);

好像“be1”不存在或者我不知道是什么。。。

button1.RegisterName(button1.Name, button1); //does not help, error...

3 回复 | 直到 15 年前

1

2

MrDosu 15 年前

    Binding b = new Binding("(Canvas.Left)");
    b.ElementName = "button1";
    testLine.SetBinding(System.Windows.Shapes.Line.X1Property, b);

编辑:

您根本不需要元素名称:

Button button1 = new Button();
Canvas.SetLeft(button1, 50);
Canvas.SetTop(button1, 50);
mainCanvas.Children.Add(button1);

Button button2 = new Button();
Canvas.SetLeft(button2, 150);
Canvas.SetTop(button2, 150);
mainCanvas.Children.Add(button2);

//juse Source reference not ElementName
Binding b1 = new Binding() { Source = button1, Path = new PropertyPath("(Canvas.Left)") };
Binding b2 = new Binding() { Source = button2, Path = new PropertyPath("(Canvas.Left)") };

testLine.SetBinding(System.Windows.Shapes.Line.X1Property, b1);
testLine.SetBinding(System.Windows.Shapes.Line.X2Property, b2);

2

1

HCL 15 年前

可能只是打字错误。创建绑定但不使用它。尝试:

testLine.SetBinding(System.Windows.Shapes.Line.X1Property, b);

3

1

Philip Rieck 15 年前

试着用另一个超负荷的SetBinding。。。您正在代码中创建一个新绑定,但实际上并没有使用它。

Binding b = new Binding("(Canvas.Left)");
b.ElementName = "button1";
testLine.SetBinding(System.Windows.Shapes.Line.X1Property, b);