C# 为每个代码隐藏的附加属性添加数据绑定
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Add DataBinding for attached Property per Code Behind
提问by Taladan
I want to add a DataBinding per Codebehind for an attached Property and want to show the Canvas.Leftproperty in a TextBox. How do I add this property?
我想为附加的属性添加每个代码隐藏的数据绑定，并希望Canvas.Left在文本框中显示该属性。如何添加此属性？
采纳答案by ageektrapped
It's somewhat unclear from your question, but I think you're asking how one would bind to the attached property Canvas.Leftand show it in a TextBox. I'll assume you want it for a control other than the TextBox.
从您的问题中有点不清楚，但我认为您是在问如何绑定到附加属性Canvas.Left并将其显示在 TextBox 中。我假设您希望它用于 TextBox 以外的控件。
<Canvas>
<TextBox x:Name="textBox" Text="{Binding ElementName=button, Path=(Canvas.Left)}" />
<Button x:Name="button" Content="Press me" />
</Canvas>
Note the brackets around the attached property.
请注意附加属性周围的括号。
EDIT: To do the equivalent in code, use the following:
编辑：要在代码中执行等效操作，请使用以下内容：
Binding binding = new Binding();
binding.Source = button;
binding.Path = new PropertyPath(Canvas.LeftProperty);
textBox.SetBinding(TextBlock.TextProperty, binding);
回答by Taladan
Yes, a canvas has no left property. it is a attached property for a FrameworkItem in a Canvas Content.
是的，画布没有左属性。它是画布内容中 FrameworkItem 的附加属性。
<Canvas Width="100" Height="100">
<TextBox Name="top" Canvas.Left="12"></TextBox>
</Canvas>
