玩在Silverlight中声音的MediaElement和微卡利 [英] Playing a sound in Silverlight with MediaElement and Caliburn Micro

问题描述

如何播放使用微卡利在Silverlight中的MP3？

How can I play an MP3 in Silverlight using Caliburn Micro?

本的MediaElement的玩（）方法需要基于视图模型一个布尔变量来执行。

The MediaElement's "play()" method needs to be executed based on a boolean variable in the ViewModel.

在此先感谢！

推荐答案

使用的IResult。 样品code
编辑：基于一个布尔值，如果你描述的这个场景我可以改变样品

Use an IResult. sample code based on a Boolean value, if you describe the scenario of this I can alter the sample.

查看：

<Grid>
        <MediaElement AutoPlay="False"
                      Source="../Assests/Kalimba.mp3"></MediaElement>
        <Button x:Name="Play"
                Content="Play"
                Height="50"
                Width="150" />
    </Grid>

视图模型：

public class MediaViewModel : Screen
    {
        public MediaViewModel()
        {
            DisplayName = "Media Sample";
        }

        public IEnumerable<IResult> Play()
        {
            var result = new PlayMediaResult();
            yield return result;
        }
    }

PlayMediaResult：

PlayMediaResult:

 public class PlayMediaResult : IResult
    {
        public void Execute(ActionExecutionContext context)
        {
            var view = context.View as FrameworkElement;
            var mediaElement = FindVisualChild<MediaElement>(view);

            if (mediaElement != null)
            {
                mediaElement.Play();
                Completed(this, new ResultCompletionEventArgs {});
            }

            Completed(this, new ResultCompletionEventArgs {});
        }

        public event EventHandler<ResultCompletionEventArgs> Completed;

        public static TChildItem FindVisualChild<TChildItem>(DependencyObject obj)
            where TChildItem : DependencyObject
        {
            for (var i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
            {
                var child = VisualTreeHelper.GetChild(obj, i);
                if (child != null && child is TChildItem)
                    return (TChildItem) child;

                var childOfChild = FindVisualChild<TChildItem>(child);
                if (childOfChild != null)
                    return childOfChild;
            }
            return null;
        }
    }
}

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