WPF登录窗口淡入淡出效果

C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.exe C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.pdb C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.csprojResolveAssemblyReference.cache C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.baml C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.g.cs C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\App.g.cs C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1_MarkupCompile.cache C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.g.resources C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.Properties.Resources.resources C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.csproj.GenerateResource.Cache C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.exe C:\Users\Administrator\Desktop\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.pdb F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.exe F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.pdb F:\@Demo练习\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.exe F:\@Demo练习\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.pdb F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.csprojResolveAssemblyReference.cache F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.baml F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.g.cs F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\App.g.cs F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1_MarkupCompile.cache F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.g.resources F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.Properties.Resources.resources F:\@Demo练习\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.csproj.GenerateResource.Cache