C#, the single case of a parent window and child window display mode is how to achieve

单例模式\单例模式\bin\Debug\单例模式.exe
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........\........\...\...\.....\单例模式.csproj.FileListAbsolute.txt
........\........\...\...\.....\单例模式.exe
........\........\...\...\.....\单例模式.frmChildren.resources
........\........\...\...\.....\单例模式.frmMdiParent.resources
........\........\...\...\.....\单例模式.pdb
........\........\...\...\.....\单例模式.Properties.Resources.resources
........\........\Program.cs
........\........\...perties\AssemblyInfo.cs
........\........\..........\Resources.Designer.cs
........\........\..........\Resources.resx
........\........\..........\Settings.Designer.cs
........\........\..........\Settings.settings
........\........\单例模式.csproj
........\单例模式.sln
........\单例模式.suo
........\........\obj\x86\Debug\TempPE
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........\........\Properties
........\单例模式
单例模式

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