WPF TextBox水印效果+ MVVM数据绑定

C:\Users\PC\source\repos\TextBoxVerification\bin\Debug\TextBoxVerification.exe.config C:\Users\PC\source\repos\TextBoxVerification\bin\Debug\TextBoxVerification.exe C:\Users\PC\source\repos\TextBoxVerification\bin\Debug\TextBoxVerification.pdb C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification.csproj.AssemblyReference.cache C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\MainWindow.g.cs C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\App.g.cs C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification_MarkupCompile.cache C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification_MarkupCompile.lref C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\MainWindow.baml C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification.g.resources C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification.Properties.Resources.resources C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification.csproj.GenerateResource.cache C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification.csproj.CoreCompileInputs.cache C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification.exe C:\Users\PC\source\repos\TextBoxVerification\obj\Debug\TextBoxVerification.pdb