|ZYCWPF| InkCanvas控件如何MVVM绑定StrokeCollected StrokeErased StrokeErasing

Question

            <InkCanvas x:Name="inkCanv" Margin="10" Background="White" StrokeCollected="{Binding OnSaveInkStroke}" StrokeErased="{Binding OnSaveInkStroke}" StrokeErasing="{Binding OnSaveInkStroke}">
            </InkCanvas>
        public ICommand OnSaveInkStroke { get; set; }
        public void SaveInkStroke()
        {        }以上绑定在运行时报错：
{"无法将类型为“System.Reflection.RuntimeEventInfo”的对象强制转换为类型“System.Reflection.MethodInfo”。"}谢谢

Answer 1

这个和上一个帖子是同样的问题，事件不能绑定。要么用事件触发器去InvokeCommandAction，要么在code behind类里写事件处理方法。
如果你要用inline的附加属性方法的话，在前一贴的基础上再加上下面这些类定义： public class StrokeCollected : EventCommand<StrokeCollected> { static StrokeCollected() { Register(InkCanvas.StrokeCollectedEvent); } }
public class StrokeErased : EventCommand<StrokeErased> { static StrokeErased() { Register(InkCanvas.StrokeErasedEvent); } }
public class StrokeErasing : EventCommand<StrokeErasing> {
static StrokeErasing() { Register<InkCanvas>(x=>x.StrokeErasing+=InvokeCommand, x=>x.StrokeErasing-=InvokeCommand); }
}前台改成：    <InkCanvas x:Name="inkCanv" Margin="10" Background="White"
                local:StrokeCollected.Command="{Binding OnSaveInkStroke}" 
                local:StrokeErased.Command="{Binding OnSaveInkStroke}" 
                local:StrokeErasing.Command="{Binding OnSaveInkStroke}">
    </InkCanvas>