C# 在WPF应用程序中添加到WrapPanel时，WindowsFormsHost的内容不可见

编辑：要快速介绍：

WindowsFormsHost

由

xaml

添加，包含所有内容。由

C#

添加的没有内容--->下面的图片

当我通过

XAML

在

WrapPanel x:Name=“VideoPanel”

中插入

WindowsFormsHost

，然后在.cs文件中添加

VideoStream VideoStream

时，视频流的内容在

WrapPanel

中可见。一切正常内容可见（下面的屏幕截图）

Adnotation:

VideoStream

扩展了

System.Windows.Forms.UserControl

XAML:

   <WrapPanel x:Name="VideoPanel" >
               <Border BorderBrush="Green" BorderThickness="2">
                        <WindowsFormsHost x:Name="Host" Width="400" Height="400"></WindowsFormsHost>
                    </Border>
   </WrapPanel>

VideoStream videoStream = new VideoStream();
Host.Child = VideoStream;

   WindowsFormsHost formsHost = new WindowsFormsHost();
        VideoStream videoStream = new VideoStream();
        formsHost.Child = videoStream;
        Border lineBorder = new Border();
        lineBorder.BorderBrush = Brushes.Green;
        lineBorder.BorderThickness = new Thickness(2);
        lineBorder.Child = new WindowsFormsHost();
        VideoPanel.Children.Add(lineBorder);
        videoStream.Height = 400;
        videoStream.Width = 400;
        lineBorder.Width = 400;
        lineBorder.Height = 400;
        formsHost.Width = 400;
        formsHost.Height = 400;

  <WrapPanel x:Name="VideoPanel" >
            </WrapPanel>

结果（正确结果）：

---

但是当我想通过C#code在

WrapPanel

中创建和插入

WindowsFormsHost

和

VideoStream

时，只有边框可见，没有内容如何使

视频流的内容可见？

我遇到问题的代码：

   <WrapPanel x:Name="VideoPanel" >
               <Border BorderBrush="Green" BorderThickness="2">
                        <WindowsFormsHost x:Name="Host" Width="400" Height="400"></WindowsFormsHost>
                    </Border>
   </WrapPanel>

VideoStream videoStream = new VideoStream();
Host.Child = VideoStream;

   WindowsFormsHost formsHost = new WindowsFormsHost();
        VideoStream videoStream = new VideoStream();
        formsHost.Child = videoStream;
        Border lineBorder = new Border();
        lineBorder.BorderBrush = Brushes.Green;
        lineBorder.BorderThickness = new Thickness(2);
        lineBorder.Child = new WindowsFormsHost();
        VideoPanel.Children.Add(lineBorder);
        videoStream.Height = 400;
        videoStream.Width = 400;
        lineBorder.Width = 400;
        lineBorder.Height = 400;
        formsHost.Width = 400;
        formsHost.Height = 400;

  <WrapPanel x:Name="VideoPanel" >
            </WrapPanel>

XAML:

   <WrapPanel x:Name="VideoPanel" >
               <Border BorderBrush="Green" BorderThickness="2">
                        <WindowsFormsHost x:Name="Host" Width="400" Height="400"></WindowsFormsHost>
                    </Border>
   </WrapPanel>

VideoStream videoStream = new VideoStream();
Host.Child = VideoStream;

   WindowsFormsHost formsHost = new WindowsFormsHost();
        VideoStream videoStream = new VideoStream();
        formsHost.Child = videoStream;
        Border lineBorder = new Border();
        lineBorder.BorderBrush = Brushes.Green;
        lineBorder.BorderThickness = new Thickness(2);
        lineBorder.Child = new WindowsFormsHost();
        VideoPanel.Children.Add(lineBorder);
        videoStream.Height = 400;
        videoStream.Width = 400;
        lineBorder.Width = 400;
        lineBorder.Height = 400;
        formsHost.Width = 400;
        formsHost.Height = 400;

  <WrapPanel x:Name="VideoPanel" >
            </WrapPanel>

结果（不正确）：

---

如何使

视频流的内容可见？
您的问题在于这一行：

lineBorder.Child = new WindowsFormsHost();

应该是：

lineBorder.Child = formsHost;

您正在创建新的windowsformshost，但未使用正确的windowsformshost