我有一个 Windows 窗体控件,我正在尝试使用WindowsFormsHost类将其包装为 WPF 控件;我想将旧控件绑定到视图模型。具体来说,该控件公开了一个网格属性GridVisible,我想将视图模型绑定到该属性。我使用一个私有的、静态的支持字段和一个静态的、只读的属性来表示依赖属性(功能上与静态的公共字段相同,但不那么混乱)。当我尝试通过 XAML 设置控件的GridVisible属性时,它没有更新。想法?我做错了什么?
绘图主机类
/// <summary>
/// Provides encapsulation of a drawing control.
/// </summary>
public class DrawingHost : WindowsFormsHost
{
#region Data Members
/// <summary>
/// Holds the disposal flag.
/// </summary>
private bool disposed;
/// <summary>
/// Holds the grid visible property.
/// </summary>
private static readonly DependencyProperty gridVisibleProperty =
DependencyProperty.Register("GridVisible", typeof(bool),
typeof(DrawingHost), new FrameworkPropertyMetadata(false,
FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
/// <summary>
/// Holds the pad.
/// </summary>
private readonly DrawingPad pad = new DrawingPad();
#endregion
#region Properties
/// <summary>
/// Get or set whether the grid is visible.
/// </summary>
public bool GridVisible
{
get { return (bool)GetValue(GridVisibleProperty); }
set { SetValue(GridVisibleProperty, pad.GridVisible = value); }
}
/// <summary>
/// Get the grid visible property.
/// </summary>
public static DependencyProperty GridVisibleProperty
{
get { return gridVisibleProperty; }
}
#endregion
/// <summary>
/// Default-construct a drawing host.
/// </summary>
public DrawingHost()
{
this.Child = this.pad;
}
/// <summary>
/// Dispose of the drawing host.
/// </summary>
/// <param name="disposing">The disposal invocation flag.</param>
protected override void Dispose(bool disposing)
{
if (disposing && !disposed)
{
if (pad != null)
{
pad.Dispose();
}
disposed = true;
}
base.Dispose(disposing);
}
}
XAML
<UserControl x:Class="Drawing.DrawingView"
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"
mc:Ignorable="d"
xmlns:local="clr-namespace:Drawing">
<local:DrawingHost GridVisible="True"/></UserControl>