Question

我使用MediaElement播放Stream音乐并通过下载进度获得该文件的下载百分比，但它总是0或1.如何获得该文件的实际下载百分比。感谢

Answer 1

我认为我们需要根据条件手动增加进度条的值，这里是代码示例

//Create a Delegate that matches 
//the Signature of the ProgressBar's SetValue method
private delegate void UpdateProgressBarDelegate(
        System.Windows.DependencyProperty dp, Object value);


private void Process()
{
    //Configure the ProgressBar
    ProgressBar1.Minimum = 0;
    ProgressBar1.Maximum = short.MaxValue;
    ProgressBar1.Value = 0;

    //Stores the value of the ProgressBar
    double value = 0;

    //Create a new instance of our ProgressBar Delegate that points
    // to the ProgressBar's SetValue method.
    UpdateProgressBarDelegate updatePbDelegate = 
        new UpdateProgressBarDelegate(ProgressBar1.SetValue);

    //Tight Loop: Loop until the ProgressBar.Value reaches the max
    do
    {
        value += 1;

        /*Update the Value of the ProgressBar:
            1) Pass the "updatePbDelegate" delegate
               that points to the ProgressBar1.SetValue method
            2) Set the DispatcherPriority to "Background"
            3) Pass an Object() Array containing the property
               to update (ProgressBar.ValueProperty) and the new value */
        Dispatcher.Invoke(updatePbDelegate, 
            System.Windows.Threading.DispatcherPriority.Background, 
            new object[] { ProgressBar.ValueProperty, value });
    }
    while (ProgressBar1.Value != ProgressBar1.Maximum);
}

这是完整的enter link description here

Answer 2

DownloadProgress是0到1之间的百分比值。所以你必须将它乘以100。 MSDN Documentation form DownloadProgress

使用MediaElement WPF下载进度

2 个答案: