如何在Winform程序中实现遮罩层对话框（蒙版窗口）源码示例

E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\bin\Debug\MaskDialogDemo.exe.config E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\bin\Debug\MaskDialogDemo.exe E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\bin\Debug\MaskDialogDemo.pdb E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.csproj.AssemblyReference.cache E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.csproj.SuggestedBindingRedirects.cache E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.FormDialog.resources E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.FormMain.resources E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.Properties.Resources.resources E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.csproj.GenerateResource.cache E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.csproj.CoreCompileInputs.cache E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.exe E:\hyq\CODE\MyApps\MaskDialogDemo\MaskDialogDemo\obj\Debug\MaskDialogDemo.pdb