绑定WindowsFormsHost子级属性 [英] Binding WindowsFormsHost Child property

问题描述

我正在创建MVVM应用程序.

I am creating an MVVM application.

在我的模型中，我需要句柄到显示在视图.我的想法是在 ViewModel 中创建该面板，然后从一侧-将视图绑定到它，在另一侧，传递其处理模型.

In my model I need handle to a System.Windows.Forms.Panel that is being displayed in the View. My idea is to create this Panel in the ViewModel and then from one side - bind the View to it, on the other side, pass its handle to the model.

我有一个WindowsFormsHost控件:

I've got an WindowsFormsHost control:

<Page x:Class="Test.Views.RenderPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:WinForms="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:Test.Views"
      mc:Ignorable="d" 
      d:DesignHeight="800" d:DesignWidth="1200"
      Title="Page1">

    <DockPanel>
        <WindowsFormsHost x:Name="winformsHost" Child="{Binding RenderPanel}"/>
    </DockPanel>
</Page>

我想将其Child属性与ViewModel提供的RenderPanel绑定

And I would like to bind it's Child property with my RenderPanel provided by ViewModel

public ObservableObject<System.Windows.Forms.Panel> RenderPanel { get; private set; }

public VideoRecorderViewModel ()
{
    RenderPanel = new System.Windows.Forms.Panel (); //Bind it here
    var model = new Model (RenderPanel.Handle); pass it to the model
}

但是，我收到一个错误消息:

However, I am getting an error saying that:

System.Windows.Markup.XamlParseException: 
A 'Binding' cannot be set on the 'Child' property of type 'WindowsFormsHost'. 
A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

该如何解决?

推荐答案

该错误不言自明.您不能绑定到属于WPF WindowsFormsHost控件的子级对象的属性

The error is self explanatory. You can't bind to a property belonging to an object that is the child of a WPF WindowsFormsHost control

您可以创建一个具有一些附加属性的类来实现此目的: 无法绑定到的解决方法属于C#/XAML应用程序中WindowsFormsHost子对象的属性?

You could create a class with some attached properties to achieve this: Workaround for inability to bind to a property that belongs to a WindowsFormsHost Child object in C#/XAML app?

或者您也可以使用ContentControl对其进行包装，如下所示:

Or you could wrap it using a ContentControl like here: Created Bindable WindowsFormsHost, but child update is not being reflected to control

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