C#鼠标动态矩形

【例子介绍】C#鼠标动态矩形
根据鼠标按下（不分左右键）拖动实时画矩形，菜鸟级代码，纯属分享。

【相关图片】

【源码结构】
文件清单
└── WindowsFormsApplication1
    ├── WindowsFormsApplication1
    │   ├── bin
    │   │   └── Debug
    │   │       ├── WindowsFormsApplication1.vshost.exe
    │   │       └── WindowsFormsApplication1.vshost.exe.manifest
    │   ├── Form1.cs
    │   ├── Form1.Designer.cs
    │   ├── Form1.resx
    │   ├── obj
    │   │   └── x86
    │   │       └── Debug
    │   │           ├── DesignTimeResolveAssemblyReferences.cache
    │   │           ├── DesignTimeResolveAssemblyReferencesInput.cache
    │   │           ├── Interop.FOXITREADEROCXLib.dll
    │   │           └── TempPE
    │   ├── Program.cs
    │   ├── Properties
    │   │   ├── AssemblyInfo.cs
    │   │   ├── Resources.Designer.cs
    │   │   ├── Resources.resx
    │   │   ├── Settings.Designer.cs
    │   │   └── Settings.settings
    │   ├── Service References
    │   └── WindowsFormsApplication1.csproj
    ├── WindowsFormsApplication1.sln
    └── WindowsFormsApplication1.suo

10 directories, 17 files