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释放 WMPLib 的资源

//定义
WindowsMediaPlayerClass wmp = new WindowsMediaPlayerClass();

//释放
public void DisposeWMPLib()
{
    if (wmp != null)
    {
        System.Runtime.InteropServices.Marshal.FinalReleaseComObject(wmp);
        wmp = null;
        System.GC.Collect();
    }
}