Process.StartInfo.FileName 
Process.StartInfo.FileName = "cmd.exe"

Process.StartInfo.UseShellExecute 
Process.StartInfo.UseShellExecute = false

// Run "csc.exe /r:System.dll /out:sample.exe stdstr.cs". UseShellExecute is false because we're specifying
// an executable directly and in this case depending on it being in a PATH folder. By setting
// RedirectStandardOutput to true, the output of csc.exe is directed to the Process.StandardOutput stream
// which is then displayed in this console window directly.
using (Process compiler = new Process())
{
    compiler.StartInfo.FileName = "csc.exe";
    compiler.StartInfo.Arguments = "/r:System.dll /out:sample.exe stdstr.cs";
    compiler.StartInfo.UseShellExecute = false;
    compiler.StartInfo.RedirectStandardOutput = true;
    compiler.Start();

    Console.WriteLine(compiler.StandardOutput.ReadToEnd());

    compiler.WaitForExit();
}

public static extern bool SendMessage(IntPtr hwdn, int wMsg, int mParam, int lParam);
//從exe\dll\ico文件中獲取指定索引或ID號的圖標句柄
[DllImport("shell32.dll", EntryPoint = "ExtractIcon")]

//獲取文件圖標的API函數
[DllImport("shell32.dll", EntryPoint = "SHGetFileInfo")]
public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttribute, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint Flags);

//從exe\dll\ico文件中生成圖標句柄數組
[DllImport("shell32.dll")]
public static extern uint ExtractIconEx(string lpszFile, int nIconIndex, int[] phiconLarge, int[] phiconSmall, uint nIcons);

//清空指定驅動器的回收站
[DllImport("shell32.dll")]
public static extern int SHEmptyRecycleBin(IntPtr hwnd, int pszRootPath, int dwFlags);

//打開系統的命令窗口
[DllImport("shell32.dll", EntryPoint = "ShellExecute")]
public static extern int ShellExecute(int hwnd, String lpOperation, String lpFile, String lpParameters, String lpDirectory, int nShowCmd);

  //用來釋放被當前線程中某個窗口捕獲的光標
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        //向指定的窗體發送Windows消息
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwdn, int wMsg, int mParam, int lParam);
        //獲取文件夾圖標的API函數
        [DllImport("User32.dll", EntryPoint = "DestroyIcon")]
        public static extern int DestroyIcon(IntPtr hIcon);
        //查詢或設置系統級參數
        [DllImport("user32.dll", EntryPoint = "SystemParametersInfoA")]
        public static extern Int32 SystemParametersInfo(Int32 uAction, Int32 uParam, string lpvparam, Int32 fuwinIni);
        //定義系統API入口點，用來關閉、注銷或者重啟計算機
        [DllImport("user32.dll", EntryPoint = "ExitWindowsEx", CharSet = CharSet.Ansi)]
        public static extern int ExitWindowsEx(int uFlags, int dwReserved);

//public為修飾符，People為結構體名稱，name、age、sex為結構體成員，每個成員包括修飾符、數據類型。
public struct People
{
   public string name;
   public int age;
   public char sex ;
};  

[StructLayout(LayoutKind.Sequential)]
struct num
{
    int a;
    int b;
}
//默認情況下在內存里是先排a,再排b
//也就是如果能取到a的地址,和b的地址,則相差一個int類型的長度,4字節

[StructLayout(LayoutKind.Explicit)]
struct S1
{
  [FieldOffset(0)]
  int a;
  [FieldOffset(0)]
  int b;
}
//需要用FieldOffset()設置每個成員的位置
//這樣就可以實現類似c的公用體的功能

[StructLayout(LayoutKind.Sequential)]
 public struct SHFILEINFO
 {
     public IntPtr hIcon;//圖標句柄
     public IntPtr iIcon;//系統圖標列表的索引
     public uint dwAttributes;//文件屬性
     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
     public string szDisplayName;//文件的路徑
     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
     public string szTypeName;//文件的類型名
 }

//定義系統API入口點，用來關閉、注銷或者重啟計算機
[DllImport("user32.dll", EntryPoint = "ExitWindowsEx", CharSet = CharSet.Ansi)]
public static extern int ExitWindowsEx(int uFlags, int dwReserved)

 public void CMDOperator(string cmd)
 {
     Process myProcess = new Process();//創建進程對象
     myProcess.StartInfo.FileName = "cmd.exe";//設置打開cmd命令窗口
     myProcess.StartInfo.UseShellExecute = false;//不使用操作系統shell啟動進程的值
     myProcess.StartInfo.RedirectStandardInput = true;//設置可以從標準輸入流讀取值
     myProcess.StartInfo.RedirectStandardOutput = true;//設置可以向標準輸出流寫入值
     myProcess.StartInfo.RedirectStandardError = true;//設置可以顯示輸入輸出流中出現的錯誤
     myProcess.StartInfo.CreateNoWindow = true;//設置在新窗口中啟動進程
     myProcess.Start();//啟動進程
     myProcess.StandardInput.WriteLine(cmd);//傳入要執行的命令
}

//注銷按鈕事件程序
//調用win32類中的ExitWindowsEx方法。
 private void button1_Click(object sender, EventArgs e)
{
    Win32.ExitWindowsEx(0, 0);//注銷計算機
}
//關機按鈕事件程序
//調用Opera類中的CMDOperator方法。使用shell腳本觸發
 private void button2_Click(object sender, EventArgs e)
 {
     oper.CMDOperator("shutdown -s -t 0");//關閉計算機
 }
//重啟按鈕事件程序
//調用Opera類中的CMDOperator方法。使用shell腳本觸發
private void button3_Click(object sender, EventArgs e)
{
    oper.CMDOperator("shutdown -r -t 0");//重啟計算機
}