我一直在关注这个问题:如何让MessageBox.Show()弹出在我WPF应用程序的中间?
我使用了Framnk的代码,如下:
using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Drawing;
namespace dsmgmt
{
public class MessageBoxEx
{
private static IntPtr _owner;
private static HookProc _hookProc;
private static IntPtr _hHook;
public static MessageBoxResult Show(string text)
{
Initialize();
return MessageBox.Show(text);
}
public static MessageBoxResult Show(string text, string caption)
{
Initialize();
return MessageBox.Show(text, caption);
}
public static MessageBoxResult Show(string text, string caption, MessageBoxButton buttons)
{
Initialize();
return MessageBox.Show(text, caption, buttons);
}
public static MessageBoxResult Show(string text, string caption, MessageBoxButton buttons, MessageBoxImage icon)
{
Initialize();
return MessageBox.Show(text, caption, buttons, icon);
}
public static MessageBoxResult Show(string text, string caption, MessageBoxButton buttons, MessageBoxImage icon, MessageBoxResult defResult)
{
Initialize();
return MessageBox.Show(text, caption, buttons, icon, defResult);
}
public static MessageBoxResult Show(string text, string caption, MessageBoxButton buttons, MessageBoxImage icon, MessageBoxResult defResult, MessageBoxOptions options)
{
Initialize();
return MessageBox.Show(text, caption, buttons, icon, defResult, options);
}
public static MessageBoxResult Show(Window owner, string text)
{
_owner = new WindowInteropHelper(owner).Handle;
Initialize();
return MessageBox.Show(owner, text);
}
public static MessageBoxResult Show(Window owner, string text, string caption)
{
_owner = new WindowInteropHelper(owner).Handle;
Initialize();
return MessageBox.Show(owner, text, caption);
}
public static MessageBoxResult Show(Window owner, string text, string caption, MessageBoxButton buttons)
{
_owner = new WindowInteropHelper(owner).Handle;
Initialize();
return MessageBox.Show(owner, text, caption, buttons);
}
public static MessageBoxResult Show(Window owner, string text, string caption, MessageBoxButton buttons, MessageBoxImage icon)
{
_owner = new WindowInteropHelper(owner).Handle;
Initialize();
return MessageBox.Show(owner, text, caption, buttons, icon);
}
public static MessageBoxResult Show(Window owner, string text, string caption, MessageBoxButton buttons, MessageBoxImage icon, MessageBoxResult defResult)
{
_owner = new WindowInteropHelper(owner).Handle;
Initialize();
return MessageBox.Show(owner, text, caption, buttons, icon, defResult);
}
public static MessageBoxResult Show(Window owner, string text, string caption, MessageBoxButton buttons, MessageBoxImage icon, MessageBoxResult defResult, MessageBoxOptions options)
{
_owner = new WindowInteropHelper(owner).Handle;
Initialize();
return MessageBox.Show(owner, text, caption, buttons, icon,
defResult, options);
}
public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
public delegate void TimerProc(IntPtr hWnd, uint uMsg, UIntPtr nIDEvent, uint dwTime);
public const int WH_CALLWNDPROCRET = 12;
public 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")]
public static extern UIntPtr SetTimer(IntPtr hWnd, UIntPtr nIDEvent, uint uElapse, TimerProc lpTimerFunc);
[DllImport("User32.dll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll")]
public static extern int UnhookWindowsHookEx(IntPtr idHook);
[DllImport("user32.dll")]
public static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
public static extern int GetWindowTextLength(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int maxLength);
[DllImport("user32.dll")]
public static extern int EndDialog(IntPtr hDlg, IntPtr nResult);
[StructLayout(LayoutKind.Sequential)]
public struct CWPRETSTRUCT
{
public IntPtr lResult;
public IntPtr lParam;
public IntPtr wParam;
public uint message;
public IntPtr hwnd;
};
static MessageBoxEx()
{
_hookProc = new HookProc(MessageBoxHookProc);
_hHook = IntPtr.Zero;
}
private static void Initialize()
{
if (_hHook != IntPtr.Zero)
{
throw new NotSupportedException("multiple calls are not supported");
}
if (_owner != null)
{
_hHook = SetWindowsHookEx(WH_CALLWNDPROCRET, _hookProc, IntPtr.Zero, AppDomain.GetCurrentThreadId());
}
}
private static IntPtr MessageBoxHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode < 0)
{
return CallNextHookEx(_hHook, nCode, wParam, lParam);
}
CWPRETSTRUCT msg = (CWPRETSTRUCT)Marshal.PtrToStructure(lParam, typeof(CWPRETSTRUCT));
IntPtr 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)
{
Rectangle recChild = new Rectangle(0, 0, 0, 0);
bool success = GetWindowRect(hChildWnd, ref recChild);
int width = recChild.Width - recChild.X;
int height = recChild.Height - recChild.Y;
Rectangle recParent = new Rectangle(0, 0, 0, 0);
success = GetWindowRect(_owner, ref recParent);
System.Drawing.Point ptCenter = new System.Drawing.Point(0, 0);
ptCenter.X = recParent.X + ((recParent.Width - recParent.X) / 2);
ptCenter.Y = recParent.Y + ((recParent.Height - recParent.Y) / 2);
System.Drawing.Point ptStart = new System.Drawing.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;
int result = MoveWindow(hChildWnd, ptStart.X, ptStart.Y, width,
height, false);
}
}
}
然后我使用 MessageBoxEx.Show('something', 'sometihng')
进行调用,结果非常奇怪。
消息框出现在屏幕左上角(不是窗口),无论我移动窗口并尝试调用该消息框,它都会始终出现在屏幕左上角。我该如何解决这个问题?