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这可能是一个愚蠢的问题,但我一直在寻找几个小时才能得到答案。c#wpf刷新绘制的矩形画布
我在我的主窗口中有一些矩形的画布。一个文本框和一个按钮,我想修改矩形的宽度
这就是我的WPF代码(画布):
<Canvas Name="IV" Width="{Binding Path=Länge}" Height="280" VerticalAlignment="Top" Margin="443,22,443.5,0">
<Rectangle Canvas.Left="0" Canvas.Top="157.5" Width="{Binding Path=Länge}" Height="136" Name="rect3704" Fill="#FF999999" StrokeThickness="0.26458332"/>
<Rectangle Canvas.Left="0" Canvas.Top="20.5" Width="{Binding Path=Länge}" Height="136" Name="rect37047" Fill="#FF999999" StrokeThickness="0.26458332"/>
<Rectangle Canvas.Left="0" Canvas.Top="294.5" Width="{Binding Path=Länge}" Height="2.5" Name="rect3721" Fill="#FF999999" StrokeThickness="0.26458332"/>
<Rectangle Canvas.Left="0" Canvas.Top="17" Width="{Binding Path=Länge}" Height="2.5" Name="rect37217" Fill="#FF999999" StrokeThickness="0.26458332"/>
<Rectangle Canvas.Left="0" Canvas.Top="293.5" Width="{Binding Path=Länge}" Height="1" Name="rect3738" Fill="#FF333333" StrokeThickness="0.26458332"/>
<Rectangle Canvas.Left="0" Canvas.Top="156.5" Width="{Binding Path=Länge}" Height="1" Name="rect37386" Fill="#FF333333" StrokeThickness="0.26458332"/>
<Rectangle Canvas.Left="0" Canvas.Top="19.5" Width="{Binding Path=Länge}" Height="1" Name="rect373867" Fill="#FF333333" StrokeThickness="0.26458332"/>
</Canvas>
我的C#代码是
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
}
public int Länge { get; set; } = 50;
public void button_Click(object sender, RoutedEventArgs e)
{
int Length = Convert.ToInt32(textBox.Text);
Länge = Length;
IV.InvalidateVisual();
IV.InvalidateMeasure();
IV.UpdateLayout();
Action emptyDelegate = delegate { };
IV.Dispatcher.Invoke(emptyDelegate, DispatcherPriority.Render);
MessageBox.Show(Convert.ToString(Länge));
}
}
如果我在声明变量'Länge'的地方修改起始值,矩形将采用指定的宽度。但通过按钮更新除了消息框以外不会执行任何操作。正如你所看到的,我尝试了Dispatcher.Invoke或canvas.InvalidateVisual()等一些soloutings,但没有任何作品.. 对不起,新来的C#,只能通过做。
看到[这个答案](http://stackoverflow.com/a/13956932/5615980) – Ron