C# 對 Win Form 窗口按鈕禁用

1.在FORM窗體代碼中定義如下代碼：

[DllImport("USER32.DLL")]
publicstaticexternintGetSystemMenu(inthwnd,intbRevert);
[DllImport("USER32.DLL")]
publicstaticexternintRemoveMenu(inthMenu,intnPosition,intwFlags);
constintMF_REMOVE = 0x1000;
constintSC_RESTORE = 0xF120;
constintSC_MOVE = 0xF010;
constintSC_SIZE = 0xF000;
constintSC_MINIMIZE = 0xF020;
constintSC_MAXIMIZE = 0xF030;
constintSC_CLOSE = 0xF060; 

2.假設要禁用「關閉」按鈕，則須要在FORM窗體加載的代碼中定義如下代碼（其餘按鈕的禁用能夠參照上面代碼所定義的變量）：

inthMenu;
hMenu = GetSystemMenu(this.Handle.ToInt32(), 0);
RemoveMenu(hMenu, SC_CLOSE, MF_REMOVE);