问题描述
在Windows Phone 8.1上，我使用的是Caliburn.Micro view-model-first方法，但是由于视图模型无法完全了解视图，因此我看不到如何将MediaCapture对象绑定到CaptureElement中。视图。
On Windows Phone 8.1, I am using the Caliburn.Micro view-model-first approach, but as the view model cannot have any knowledge of the view, I cannot see how I can bind a MediaCapture object to a CaptureElement in the view.
推荐答案
我遇到了同样的问题。我在Windows Phone 8.1 WinRT（通用应用程序）中使用了MVVM Light。
I had the same problem. I'm using MVVM Light with Windows Phone 8.1 WinRT (Universal Apps).
我使用ContentControl并绑定到CaptureElement：
I used ContentControl and binded to CaptureElement:
<ContentControl HorizontalAlignment="Left"
Width="320" Height="140" Content="{Binding CaptureElement}"/>
CaptureElement和MediaCapture是我的ViewModel中的属性：
CaptureElement and MediaCapture are properties in my ViewModel:
private MediaCapture _mediaCapture;
public MediaCapture MediaCapture
{
get
{
if (_mediaCapture == null) _mediaCapture = new MediaCapture();
return _mediaCapture;
}
set
{
Set(() => MediaCapture, ref _mediaCapture, value);
}
}
private CaptureElement _captureElement;
public CaptureElement CaptureElement
{
get
{
if (_captureElement == null) _captureElement = new CaptureElement();
return _captureElement;
}
set
{
Set(() => CaptureElement, ref _captureElement, value);
}
}
接下来，我在ViewModel的构造函数中调用ConfigureMedia（）：
And next I call ConfigureMedia() in ViewModel's constructor:
async void ConfigureMedia()
{
await MediaCapture.InitializeAsync();
CaptureElement.Source = MediaCapture;
await MediaCapture.StartPreviewAsync();
}
重要的是首先初始化MediaCapture，然后设置Source，最后是StartPeview。对我来说，它有效：）
It's important to firstly initialize MediaCapture, next set Source and finally StartPeview. For me it works :)
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