Question

c# 关闭右上角的X 如何设置为退出程序

Answer 1

是FormClosing的事件,在窗体执行关闭时触发的代码，不是FormClosed，那是在窗体关闭后才触发，不过系统默认X就是关闭，没必要去特意设置，除非你是子窗体关了连同父窗体一起关

Answer 2

调用windows
api试一下
[dllimport("user32.dll")]
internal
static
extern
intptr
getsystemmenu(intptr
hwnd,bool
brevert);
[dllimport("user32.dll")]
internal
static
extern
int
getmenuitemcount(intptr
hmenu);
[dllimport("user32.dll")]
internal
static
extern
int
removemenu(intptr
hmenu,int
uposition,int
uflags);
///
///
窗体的关闭按钮失效
///
protected
void
closebuttonenable(){
//
默认窗口去除关闭按钮
const
int
mf_byposition
=
0x00000400;
intptr
hwindow
=
this.handle;
intptr
hmenu
=
getsystemmenu(hwindow,false);
int
count
=
getmenuitemcount(hmenu);
removemenu(hmenu,count
-
1,mf_byposition);
removemenu(hmenu,count
-
2,mf_byposition);
}