以前写的，最近用到了，搬运一下
/*
* 名称:MessageBox
* 依赖:无
* 功能:MessageBox对话框，能够相对于父窗体居中
* 作者:冰麟轻武
* 日期:2011年5月18日
* 版本:1.3
* 最后更新:2018年4月6日
*/
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
namespace 直接替换自己的命名空间
{
/// <summary>
/// MessageBox对话框，能够相对于父窗体居中
/// </summary>
public class MessageBox
{
public static DialogResult Show(string text)
{
Initialize();
return System.Windows.Forms.MessageBox.Show(text);
}
public static DialogResult Show(string text, string caption)
{
Initialize();
return System.Windows.Forms.MessageBox.Show(text, caption);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons)
{
var frm = Form.ActiveForm;
_owner = frm.IsMdiContainer ? frm.ActiveMdiChild : frm;
Initialize();
return System.Windows.Forms.MessageBox.Show(text, caption, buttons);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
{
Initialize();
return System.Windows.Forms.MessageBox.Show(text, caption, buttons, icon);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton)
{
Initialize();
return System.Windows.Forms.MessageBox.Show(text, caption, buttons, icon, defButton);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options)
{
Initialize();
return System.Windows.Forms.MessageBox.Show(text, caption, buttons, icon, defButton, options);
}
public static DialogResult Show(IWin32Window owner, string text)
{
Initialize(owner);
return System.Windows.Forms.MessageBox.Show(owner, text);
}
public static DialogResult Show(IWin32Window owner, string text, string caption)
{
Initialize(owner);
return System.Windows.Forms.MessageBox.Show(owner, text, caption);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons)
{
Initialize(owner);
return System.Windows.Forms.MessageBox.Show(owner, text, caption, buttons);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
{
Initialize(owner);
return System.Windows.Forms.MessageBox.Show(owner, text, caption, buttons, icon);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton)
{
Initialize(owner);
return System.Windows.Forms.MessageBox.Show(owner, text, caption, buttons, icon, defButton);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options)
{
Initialize(owner);
return System.Windows.Forms.MessageBox.Show(owner, text, caption, buttons, icon,
defButton, options);
}
#region 私有API
private static IWin32Window _owner;
private static HookProc _hookProc;
private static IntPtr _hHook;
delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
const int WH_CALLWNDPROCRET = 12;
enum CbtHookAction : int
{
HCBT_MOVESIZE = 0,
HCBT_MINMAX = 1,
HCBT_QS = 2,
HCBT_CREATEWND = 3,
HCBT_DESTROYWND = 4,
HCBT_ACTIVATE = 5,
HCBT_CLICKSKIPPED = 6,
HCBT_KEYSKIPPED = 7,
HCBT_SYSCOMMAND = 8,
HCBT_SETFOCUS = 9
}
[DllImport("user32.dll")]
private static extern bool GetWindowRect(IntPtr hWnd, ref Rectangle lpRect);
[DllImport("user32.dll")]
private static extern int MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);
[DllImport("user32.dll")]
static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll")]
static extern int UnhookWindowsHookEx(IntPtr idHook);
[DllImport("user32.dll")]
static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, IntPtr wParam, IntPtr lParam);
[StructLayout(LayoutKind.Sequential)]
struct CWPRETSTRUCT
{
public IntPtr lResult;
public IntPtr lParam;
public IntPtr wParam;
public uint message;
public IntPtr hwnd;
};
static MessageBox()
{
_hookProc = new HookProc(MessageBoxHookProc);
_hHook = IntPtr.Zero;
}
private static void Initialize(IWin32Window owner = null)
{
if (_hHook != IntPtr.Zero)
{
return;
}
if (owner == null)
{
_owner = Form.ActiveForm;
}
if (_owner is Form frm)
{
if (frm.Visible == false)
{
_owner = null;
}
else if (frm.IsMdiContainer)
{
_owner = frm.ActiveMdiChild;
}
}
if (_owner != null)
{
_hHook = SetWindowsHookEx(WH_CALLWNDPROCRET, _hookProc, IntPtr.Zero, AppDomain.GetCurrentThreadId());
}
else
{
_hHook = IntPtr.Zero;
}
}
private static IntPtr MessageBoxHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode < 0)
{
return CallNextHookEx(_hHook, nCode, wParam, lParam);
}
var msg = (CWPRETSTRUCT)Marshal.PtrToStructure(lParam, typeof(CWPRETSTRUCT));
var hook = _hHook;
if (msg.message == (int)CbtHookAction.HCBT_ACTIVATE)
{
try
{
CenterWindow(msg.hwnd);
}
finally
{
UnhookWindowsHookEx(_hHook);
_hHook = IntPtr.Zero;
}
}
return CallNextHookEx(hook, nCode, wParam, lParam);
}
private static void CenterWindow(IntPtr hChildWnd)
{
var recChild = new Rectangle(0, 0, 0, 0);
var success = GetWindowRect(hChildWnd, ref recChild);
var width = recChild.Width - recChild.X;
var height = recChild.Height - recChild.Y;
var recParent = new Rectangle(0, 0, 0, 0);
success = GetWindowRect(_owner.Handle, ref recParent);
var ptCenter = new Point(0, 0);
ptCenter.X = recParent.X + ((recParent.Width - recParent.X) / 2);
ptCenter.Y = recParent.Y + ((recParent.Height - recParent.Y) / 2);
var ptStart = new Point(0, 0);
ptStart.X = (ptCenter.X - (width / 2));
ptStart.Y = (ptCenter.Y - (height / 2));
ptStart.X = (ptStart.X < 0) ? 0 : ptStart.X;
ptStart.Y = (ptStart.Y < 0) ? 0 : ptStart.Y;
var result = MoveWindow(hChildWnd, ptStart.X, ptStart.Y, width,
height, false);
}
#endregion
}
}
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