节能以下MVVM模式一个WPF画布图像 [英] Saving a WPF canvas as an image following MVVM Pattern

问题描述

我有一个画布，例如类似该解决方案或许多他人使用的ItemsControl 。

I have a canvas, e.g. similar to this solution or many others using the ItemsControl.

现在我想这应该绑定到一个ICommand的按钮。该命令应调用视图模型类的方法，可以保存图像。
的保存方法是明确的，但我怎么做MVVM模式下的结合？

Now I want a button which should be bound to an ICommand. This command should call a method of ViewModel class which can save the image. The saving method is clear, but how do I do the binding following the MVVM pattern?

推荐答案

您可以传递画布使用CommandParameter视图模型的保存方法。

You could pass the Canvas to the ViewModel's Save method using a CommandParameter

<Button Content="Save" 
        Command="{Binding SaveCanvasCommand}" 
        CommandParameter="{Binding ElenementName=myCanvas}" ?>

<Canvas x:Name="myCanvas">
   <!-- Stuff to save -->
</Canvas>

和地方在你的ViewModel或命令你必须

And somewhere in you ViewModel or Command you'd have

void SaveCanvasCommandExecute(object parameter)
{
    UIElement toSave = (UIElement)parameter;
    //.. You'd probably use RenderTargetBitmap here to save toSave.
}

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