WPF: NotSupportedException: The URI prefix is not recognized.

1.如果你有MyWindow的源代码，添加前缀pack://application:,,, 

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_dictionary.Source = new Uri("pack://application:,,,/RibbonControlsLibrary;component/Themes/RibbonWindow.xaml", UriKind.Relative);

2.如果MyWindow是第三方提供的，你就需要在new MyWindow()之前加上下面的语句： 

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System.Windows.Application app = new System.Windows.Application();
app.ShutdownMode = System.Windows.ShutdownMode.OnExplicitShutdown;

分析Applicaiton的源代码其实就会发现，在它的静态构造函数中有下面的代码：