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代码说明：

说明：  C#画图,画线，画圆，橡皮擦 C#画图,画线，画圆，橡皮擦(C#画图)

文件列表：

Ex13_47\bin\Debug\Ex13_47.exe
Ex13_47\bin\Debug\Ex13_47.pdb
Ex13_47\bin\Debug\Ex13_47.vshost.exe
Ex13_47\Ex13_47.csproj
Ex13_47\Form1.cs
Ex13_47\Form1.designer.cs
Ex13_47\Form1.resx
Ex13_47\obj\Debug\Ex13_47.csproj.GenerateResource.Cache
Ex13_47\obj\Debug\Ex13_47.exe
Ex13_47\obj\Debug\Ex13_47.Form1.resources
Ex13_47\obj\Debug\Ex13_47.pdb
Ex13_47\obj\Debug\Ex13_47.Properties.Resources.resources
Ex13_47\obj\Ex13_47.csproj.FileList.txt
Ex13_47\obj\Ex13_47.csproj.FileListAbsolute.txt
Ex13_47\Program.cs
Ex13_47\Properties\AssemblyInfo.cs
Ex13_47\Properties\Resources.Designer.cs
Ex13_47\Properties\Resources.resx
Ex13_47\Properties\Settings.Designer.cs
Ex13_47\Properties\Settings.settings
Ex13_47\obj\Debug\Refactor
Ex13_47\obj\Debug\TempPE
Ex13_47\bin\Debug
Ex13_47\obj\Debug
Ex13_47\bin
Ex13_47\obj
Ex13_47\Properties
Ex13_47