如何让messagebox.show的在父窗口上居中显示

如何让MessageBox.Show的在父窗口上居中显示...
如何在.NET Windows Form编程中让MessageBox.Show()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MessageBox.Show类似的模态窗口。

方法三：如果你一定要用MessageBox.Show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MessageBoxEx.cs的代码，可以直接使用MessageBoxEx.Show()方法实现
MessageBox.Show()的功能，并在父窗口上居中显示：using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;
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("user32.dll")]
private static extern IntPtr SetWindowsHookEx(int hookid,
HookProc pfnhook, IntPtr hinst, int
threadid);
[DllImport("user32.dll")]
private static extern IntPtr CallNextHookEx(IntPtr hhook,
int code, IntPtr wparam, IntPtr lparam);
[DllImport("kernel32.dll")]
private static extern IntPtr GetModuleHandle(string modName);
[DllImport("user32.dll")]
private static extern bool UnhookWindowsHookEx(IntPtr hhook);
[DllImport("user32.dll")]
private static extern bool
GetWindowRect(IntPtr hWnd, ref RECT rect);
[DllImport("user32.dll")]
private static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);
[DllImport("user32.dll")]
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 = IntPtr.Zero;
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 = vRectangle.right - vRectangle.left;
int height = vRectangle.bottom - vRectangle.top;
int ownerWidth = ownerRect.right - ownerRect.left;
int ownerHeight = ownerRect.bottom - ownerRect.top;
int left =
Math.Max(ownerRect.left + (ownerWidth - width) / 2, 0);
int top =
Math.Max(ownerRect.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 MessageBox.Show(text);
}
public static DialogResult
Show(IWin32Window owner, string text)
{
Lock();
return MessageBox.Show(owner, text);
}
public static DialogResult Show(string text, string caption)
{
Lock();
return MessageBox.Show(text, caption);
}
public static DialogResult
Show(IWin32Window owner, string text, string caption)
{
Lock();
return MessageBox.Show(owner, text, caption);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons)
{
Lock();
return MessageBox.Show(text, caption, buttons);
}
public static DialogResult
Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons)
{
Lock();
return MessageBox.Show(owner, text, caption, buttons);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
{
Lock();
return MessageBox.Show(text, caption, buttons, icon);
}
public static DialogResult
Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
{
Lock();
return MessageBox.Show(owner, text, caption, buttons, icon);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
{
Lock();
return MessageBox.Show(text, caption, buttons, icon, defaultButton);
}
}
}
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/707043659/blog/1247672380。