2024年1月21日发(作者：)
如何让的在父窗口上居中显示...
如何在.NET Windows Form编程中让()弹出的消息框在父窗口上居中显示？
方法一：由于在VS2008中MessageBox共有21个重载方法，且没有一个方法可以指定显示的位置。这21个静态方法，实际上是调用的Windows API，你可以尝试直接调用该API来实现。
方法二（推荐）：由于MessageBox不能继承和重写，所以可以自己定义一个MessageBox窗体，注意设置DialogResult属性，设置StartPosition为CenterParent在父窗口居中，当然你可以设置Left和Top属性，使消息窗口中任意位置。使用ShowDialog方法显示与类似的模态窗口。
方法三：如果你一定要用方法，可以使用Windows API FindWindow函数通过Title找到MessageBox窗口的句柄，通过API函数MoveWindow设置窗口的位置。下面为的代码，可以直接使用()方法实现()的功能，并在父窗口上居中显示：
using System;
using c;
using ;
using pServices;
using ;
using g;
namespace WindowsFormsApplication3
{
struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
};
//实现MessageBox居中owner窗体显示
class MessageBoxEx
{
public delegate IntPtr HookProc(int nCode,
IntPtr wParam, IntPtr lParam);
[DllImport("")]
private static extern IntPtr
SetWindowsHookEx(int hookid,
HookProc pfnhook, IntPtr hinst, int
threadid);
[DllImport("")]
private static extern IntPtr
CallNextHookEx(IntPtr hhook,
int code, IntPtr wparam, IntPtr lparam);
[DllImport("")]
private static extern IntPtr
GetModuleHandle(string modName);
[DllImport("")]
private static extern bool
UnhookWindowsHookEx(IntPtr hhook);
[DllImport("")]
private static extern bool
GetWindowRect(IntPtr hWnd, ref RECT rect);
[DllImport("")]
private static extern IntPtr GetWindow(IntPtr
hWnd, uint uCmd);
[DllImport("")]
private static extern bool MoveWindow(
IntPtr hWnd, int X, int Y, int nWidth, int
nHeight, bool bRepaint);
private const int WH_CBT = 5;
private const int HCBT_ACTIVATE = 5;
private const int GW_OWNER = 4;
private static IntPtr hookHandle = ;
private static RECT GetOwnerRect(IntPtr
hwnd)
{
RECT ownerRect = new RECT();
IntPtr ownerHwnd = GetWindow(hwnd,
GW_OWNER);
GetWindowRect(ownerHwnd, ref
ownerRect);
return ownerRect;
}
private static IntPtr CBTHookCallback(int
nCode, IntPtr wParam, IntPtr lParam)
{
switch (nCode)
{
case HCBT_ACTIVATE:
RECT vRectangle = new
RECT();
RECT ownerRect =
GetOwnerRect(wParam);
GetWindowRect(wParam, ref
vRectangle);
int width = -
;
int height =
- ;
int ownerWidth =
- ;
int ownerHeight =
- ;
int left =
( + (ownerWidth - width) / 2, 0);
int top =
( + (ownerHeight - height) / 2, 0);
MoveWindow(wParam,
left,
top,
width, height, false);
UnhookWindowsHookEx(hookHandle);
break;
}
return CallNextHookEx(hookHandle,
nCode, wParam, lParam);
}
private static void Lock()
{
hookHandle =
SetWindowsHookEx(WH_CBT, new
HookProc(CBTHookCallback),
GetModuleHandle(null), 0);
}
//根据需要重载
public static DialogResult Show(string text)
{
Lock();
return (text);
}
public static DialogResult
Show(IWin32Window owner, string text)
{
Lock();
return (owner, text);
}
public static DialogResult Show(string text,
string caption)
{
Lock();
return (text, caption);
}
public static DialogResult
Show(IWin32Window owner, string text, string caption)
{
Lock();
return (owner, text,
caption);
}
public static DialogResult Show(string text,
string caption, MessageBoxButtons buttons)
{
Lock();
return (text, caption,
buttons);
}
public static DialogResult
Show(IWin32Window owner, string text, string caption,
MessageBoxButtons buttons)
{
Lock();
return (owner, text,
caption, buttons);
}
public static DialogResult Show(string text,
string caption, MessageBoxButtons buttons,
MessageBoxIcon icon)
{
Lock();
return (text, caption,
buttons, icon);
}
public static DialogResult
Show(IWin32Window owner, string text, string caption,
MessageBoxButtons buttons, MessageBoxIcon icon)
{
Lock();
return (owner, text,
caption, buttons, icon);
}
public static DialogResult Show(string text,
string caption, MessageBoxButtons buttons,
MessageBoxIcon icon, MessageBoxDefaultButton
defaultButton)
{
Lock();
return (text, caption,
buttons, icon, defaultButton);
}
}
}
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/707043659/blog/1247672380
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