[英]Binding WindowsFormsHost Child property
我正在创建MVVM应用程序。
在我的模型中,我需要处理 View中显示的System.Windows.Forms.Panel 。 我的想法是在ViewModel中 创建此Panel,然后从一侧将View绑定到它 ,在另一侧,将其句柄传递给模型 。
我有一个WindowsFormsHost控件:
<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
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,我得到一个错误,说:
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.
如何解决这个问题?
该错误不言自明。 您不能绑定到属于WPF WindowsFormsHost控件的子对象的对象的属性
您可以创建一个带有一些附加属性的类来实现此目的: 是否无法绑定到属于C#/ XAML应用程序中WindowsFormsHost Child对象的属性的解决方法?
或者,您也可以使用ContentControl对其进行包装,如下所示: 创建了Bindable WindowsFormsHost,但子更新未反映到控件中
创建WindowsFormHost类型的依赖项属性和对象,并在属性Chaged事件处理程序中设置子属性。
using System.Windows.Forms.Integration;
namespace MainStartUp.DependencyObjects
{
public class FormHostDependencyObject : WindowsFormsHost
{
public static readonly DependencyProperty ContentControlProperty =
DependencyProperty.Register("ContentControl",
typeof(System.Windows.Forms.Control),
typeof(FormHostDependencyObject),
new PropertyMetadata(new System.Windows.Forms.Control(),
PropertyChaged));
public static void SetContentControl(UIElement element, string value)
{
element.SetValue(ContentControlProperty, value);
}
public static string GetContentControl(UIElement element)
{
return (string)element.GetValue(ContentControlProperty);
}
private static void PropertyChaged(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs e)
{
((FormHostDependencyObject)dependencyObject).Child =
(System.Windows.Forms.Control)e.NewValue;
}
}
}
如下在xaml中使用它。
<UserControl x:Class="MainStartUp.Views.WIndowsHostUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-
compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:MainStartUp.Views"
xmlns:DependecyObjects="clr-
namespace:MainStartUp.DependencyObjects"
xmlns:wf="clr-
namespace:System.Windows.Forms;assembly=System.Windows.Forms"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<!--<ContentControl Content="{Binding ContentControl}" />-->
<DependecyObjects:FormHostDependencyObject ContentControl="{Binding
ContentControl}"></DependecyObjects:FormHostDependencyObject>
</Grid>
</UserControl>
在我的视图模型中,我有一个对象属性,将为其托管窗口控件对象:
public object ContentControl
{
get
{
return _contentControl;
}
set
{
_contentControl = value;
RaisePropertyChangedEvent("ContentControl");
}
}
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