C# 在后面的代码中更改 Canvas.Left 属性？
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Change Canvas.Left property in code behind?
提问by Edward Tanguay
I have a rectangle in my XAML and want to change its Canvas.Leftproperty in code behind:
我的 XAML 中有一个矩形，想Canvas.Left在后面的代码中更改其属性：
<UserControl x:Class="Second90.Page"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="400" Height="300" KeyDown="txt_KeyDown">
<Canvas>
<Rectangle
Name="theObject"
Canvas.Top="20"
Canvas.Left="20"
Width="10"
Height="10"
Fill="Gray"/>
</Canvas>
</UserControl>
But this doesn't work:
但这不起作用：
private void txt_KeyDown(object sender, KeyEventArgs e)
{
theObject.Canvas.Left = 50;
}
Does anyone know what the syntax is to do this?
有谁知道这样做的语法是什么？
采纳答案by AnthonyWJones
Canvas.SetLeft(theObject, 50)
回答by JaredPar
Try this
尝试这个
theObject.SetValue(Canvas.LeftProperty, 50d);
There is a group of methods on DependencyObject (base of most WPF classes) which allow the common access to all dependency properties. They are
DependencyObject（大多数 WPF 类的基础）上有一组方法，它们允许对所有依赖属性进行公共访问。他们是
- SetValue
- GetValue
- ClearValue
- 设定值
- 获取值
- 清除值
EditUpdated the set to use a double literal since the target type is a double.
编辑更新集合以使用双精度文字，因为目标类型是双精度。
回答by Budda
As we are changing the property of the 'object', it would be better to use method suggedte by JaredPar:
由于我们正在更改“对象”的属性，因此最好使用 JaredPar 建议的方法：
theObject.SetValue(Canvas.LeftProperty, 50d);
