C# 里 MessageBox 怎么居中于父窗体？
public class MessageBoxEx
{
private static IWin32Window _owner;
private static HookProc _hookProc;
private static IntPtr _hHook;
public static DialogResult Show(string text)
{
Initialize();
return MessageBox.Show(text);
}
public static DialogResult Show(string text, string caption)
{
Initialize();
return MessageBox.Show(text, caption);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons)
{
Initialize();
return MessageBox.Show(text, caption, buttons);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
{
Initialize();
return MessageBox.Show(text, caption, buttons, icon);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton)
{
Initialize();
return 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 MessageBox.Show(text, caption, buttons, icon, defButton, options);
}
public static DialogResult Show(IWin32Window owner, string text)
{
_owner = owner;
Initialize();
return MessageBox.Show(owner, text);
}
public static DialogResult Show(IWin32Window owner, string text, string caption)
{
_owner = owner;
Initialize();
return MessageBox.Show(owner, text, caption);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons)
{
_owner = owner;
Initialize();
return MessageBox.Show(owner, text, caption, buttons);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
{
_owner = owner;
Initialize();
return MessageBox.Show(owner, text, caption, buttons, icon);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton)
{
_owner = owner;
Initialize();
return 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)
{
_owner = owner;
Initialize();
return MessageBox.Show(owner, text, caption, buttons, icon,
defButton, 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.Handle, ref recParent);
Point ptCenter = new Point(0, 0);
ptCenter.X = recParent.X + ((recParent.Width - recParent.X) / 2);
ptCenter.Y = recParent.Y + ((recParent.Height - recParent.Y) / 2);
Point 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;
int result = MoveWindow(hChildWnd, ptStart.X, ptStart.Y, width,
height, false);
}
}
引用地址http://*.com/questions/1732443/center-messagebox-in-parent-form second paragraph
/// <summary>
/// 对话框，能够相对于父窗体居中，不显示使用DllImport 使用从窗体继承 实现
/// </summary>
public class MessageBoxFrmEx
{
/// <summary>
/// 从窗体类继承的对话框类
/// </summary>
private class MessageBoxFrm : System.Windows.Forms.Form
{
#region 字段
private IWin32Window _BoxOwner = null;
private MessageBoxButtons _BoxButtons = MessageBoxButtons.OK;
private MessageBoxDefaultButton _BoxDefaultButton = MessageBoxDefaultButton.Button1;
private MessageBoxIcon _BoxIcon = MessageBoxIcon.None;
private Bitmap _BoxIconBmp = null;
private string _BoxCaption = string.Empty;
private string _BoxText = string.Empty;
private bool _CanClose = false;
#endregion
#region 属性
/// <summary>
/// 父窗体
/// </summary>
public IWin32Window BoxOwner
{
get { return _BoxOwner; }
set
{
_BoxOwner = value;
if (_BoxOwner == null)
{
StartPosition = FormStartPosition.CenterScreen;
}
else
{
StartPosition = FormStartPosition.CenterParent;
}
}
}
/// <summary>
/// 对话框上显示的按钮
/// </summary>
public MessageBoxButtons BoxButtons
{
get { return _BoxButtons; }
set { _BoxButtons = value; }
}
/// <summary>
/// 默认选中的那个按钮
/// </summary>
public MessageBoxDefaultButton BoxDefaultButton
{
get { return _BoxDefaultButton; }
set { _BoxDefaultButton = value; }
}
/// <summary>
/// 对话框上显示的图标
/// </summary>
public MessageBoxIcon BoxIcon
{
get { return _BoxIcon; }
set
{
_BoxIcon = value;
System.Drawing.Icon bmp = null;
if (BoxIcon == MessageBoxIcon.Asterisk)
{
bmp = SystemIcons.Asterisk;
}
else if (BoxIcon == MessageBoxIcon.Hand)
{
bmp = SystemIcons.Hand;
}
else if (BoxIcon == MessageBoxIcon.Information)
{
bmp = SystemIcons.Information;
}
else if (BoxIcon == MessageBoxIcon.Question)
{
bmp = SystemIcons.Question;
}
else if (BoxIcon == MessageBoxIcon.Exclamation || BoxIcon == MessageBoxIcon.Warning)
{
bmp = SystemIcons.Exclamation;
}
else if (BoxIcon == MessageBoxIcon.Stop || BoxIcon == MessageBoxIcon.Error)
{
bmp = SystemIcons.Warning;
}
else
{
bmp = null;
}
if (bmp != null)
_BoxIconBmp = bmp.ToBitmap();
else
_BoxIconBmp = null;
}
}
/// <summary>
/// 对话框显示的标题
/// </summary>
public string BoxCaption
{
get { return _BoxCaption; }
set
{
_BoxCaption = value;
this.Text = _BoxCaption;
}
}
/// <summary>
/// 对话框显示的文本
/// </summary>
public string BoxText
{
get { return _BoxText; }
set { _BoxText = value; }
}
#endregion
#region 构造函数
public MessageBoxFrm()
: base()
{
}
public MessageBoxFrm(IWin32Window owner, string text)
:base()
{
BoxOwner = owner;
BoxText = text;
}
public MessageBoxFrm(IWin32Window owner, string text, string caption)
: base()
{
BoxOwner = owner;
BoxText = text;
BoxCaption = caption;
}
public MessageBoxFrm(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultbutton)
: base()
{
BoxOwner = owner;
BoxCaption = caption;
BoxText = text;
BoxButtons = buttons;
BoxDefaultButton = defaultbutton;
BoxIcon = icon;
}
#endregion
#region 重载
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected override void OnLoad(EventArgs e)
{
_AdjustSize();
base.OnLoad(e);
this.FormBorderStyle = FormBorderStyle.FixedDialog;
this.MaximizeBox = false;
this.MinimizeBox = false;
this.Icon = null;
_PlaySound();
_PlaceButtons();
}
/// <summary>
/// 在对话框上 画按钮 画文本
/// </summary>
/// <param name="e"></param>
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Graphics g = e.Graphics;
int xpos = 0;
int ypos = 20;
if (_BoxIconBmp != null)
{
g.DrawImage(_BoxIconBmp, new Point(15, 15));
xpos = 60;
}
g.DrawString(BoxText, new Font(FontFamily.GenericSansSerif, 8), new SolidBrush(Color.Black), new PointF(xpos, ypos));
}
/// <summary>
/// 屏蔽通过单击窗体关闭按钮关闭窗体
/// </summary>
/// <param name="e"></param>
protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
e.Cancel = !_CanClose;
base.OnClosing(e);
if (this.Owner != null)
{
this.Owner.Show();
}
}
#region 没用？ 在按钮的 Text里 加入&大写字母后 自动关联Alt快捷键？
//protected override void OnKeyDown(KeyEventArgs e)
//{
// base.OnKeyDown(e);
// if (e.Control)
// {
// switch (e.KeyCode)
// {
// case Keys.A:
// if (BoxButtons == MessageBoxButtons.AbortRetryIgnore)
// {
// this.DialogResult = DialogResult.Abort;
// }
// break;
// case Keys.R:
// if (BoxButtons == MessageBoxButtons.RetryCancel || BoxButtons == MessageBoxButtons.AbortRetryIgnore)
// {
// this.DialogResult = DialogResult.Retry;
// }
// break;
// case Keys.Y:
// if (BoxButtons == MessageBoxButtons.YesNo || BoxButtons == MessageBoxButtons.YesNoCancel)
// {
// this.DialogResult = DialogResult.Yes;
// }
// break;
// case Keys.N:
// if (BoxButtons == MessageBoxButtons.YesNo || BoxButtons == MessageBoxButtons.YesNoCancel)
// {
// this.DialogResult = DialogResult.No;
// }
// break;
// case Keys.C:
// if (BoxButtons == MessageBoxButtons.OKCancel || BoxButtons == MessageBoxButtons.RetryCancel || BoxButtons == MessageBoxButtons.YesNoCancel)
// {
// this.DialogResult = DialogResult.Cancel;
// }
// break;
// case Keys.I:
// if (BoxButtons == MessageBoxButtons.AbortRetryIgnore)
// {
// this.DialogResult = DialogResult.Ignore;
// }
// break;
// case Keys.O:
// if (BoxButtons == MessageBoxButtons.OK || BoxButtons == MessageBoxButtons.OKCancel)
// {
// this.DialogResult = DialogResult.OK;
// }
// break;
// default: break;
// }
// }
//}
#endregion
#endregion
#region 私有方法
/// <summary>
/// 根据是否要显示图标 标题栏文字长度 内容长度 调整对话框大小
/// </summary>
private void _AdjustSize()
{
int width = 0;
int height = 0;
if (string.IsNullOrEmpty(_BoxText) && string.IsNullOrEmpty(_BoxCaption))
{
}
else
{
Graphics g = this.CreateGraphics();
Font ft = new Font(FontFamily.GenericSansSerif, 12);
SizeF size1 = g.MeasureString(BoxCaption, ft);
SizeF size2 = g.MeasureString(BoxText, ft);
width = (int)(size1.Width > width + size2.Width ? size1.Width : width + size2.Width);
height = (int)size2.Height;
g.Dispose();
g = null;
}
if (BoxIcon != MessageBoxIcon.None)
{
width += 60;
}
height = height > 25 ? height : 25;
if (BoxButtons == MessageBoxButtons.OK)
{
}
else if (BoxButtons == MessageBoxButtons.OKCancel || BoxButtons == MessageBoxButtons.RetryCancel
|| BoxButtons == MessageBoxButtons.YesNo)
{
width = width > 180 ? width : 180;
}
else if (BoxButtons == MessageBoxButtons.AbortRetryIgnore || BoxButtons == MessageBoxButtons.YesNoCancel)
{
width = width > 260 ? width : 260;
}
height += 35 + 15 + 15 + 30 + 5; //标题栏高 35px 受图标影响 上空15pc 下空15px 按钮栏高度30px 底部边框5px
width += 5 + 25 + 5; //做边框5px 受图标影响左空25px 右边框5px
this.Width = width;
this.Height = height;
}
/// <summary>
/// 显示对话框上的按钮
/// </summary>
private void _PlaceButtons()
{
Button button1 = null;
Button button2 = null;
Button button3 = null;
switch (BoxButtons)
{
case MessageBoxButtons.AbortRetryIgnore:
button1 = new Button();
button1.Text = "终止(&A)";
button1.Height = 20;
button1.DialogResult = DialogResult.Abort;
button2 = new Button();
button2.Height = 20;
button2.Text = "重试(&R)";
button2.DialogResult = DialogResult.Cancel;
button3 = new Button();
button3.Height = 20;
button3.Text = "忽略(&I)";
button3.DialogResult = DialogResult.Ignore;
break;
case MessageBoxButtons.RetryCancel:
button1 = new Button();
button1.Text = "重试(&R)";
button1.Height = 20;
button1.DialogResult = DialogResult.Retry;
button2 = new Button();
button2.Text = "取消(&Y)";
button2.Height = 20;
button2.DialogResult = DialogResult.Cancel;
break;
case MessageBoxButtons.YesNoCancel:
button1 = new Button();
button1.Text = "是(&Y)";
button1.Height = 20;
button1.DialogResult = DialogResult.Yes;
button2 = new Button();
button2.Text = "否(&N)";
button2.Height = 20;
button2.DialogResult = DialogResult.No;
button3 = new Button();
button3.Text = "取消(&C)";
button3.Height = 20;
button3.DialogResult = DialogResult.Cancel;
break;
case MessageBoxButtons.YesNo:
button1 = new Button();
button1.Text = "是(&Y)";
button1.Height = 20;
button1.DialogResult = DialogResult.Yes;
button2 = new Button();
button2.Text = "否(&N)";
button2.Height = 20;
button2.DialogResult = DialogResult.No;
break;
case MessageBoxButtons.OKCancel:
button1 = new Button();
button1.Text = "确定(&O)";
button1.Height = 20;
button1.DialogResult = DialogResult.OK;
button2 = new Button();
button2.Text = "取消(&C)";
button2.Height = 20;
button2.DialogResult = DialogResult.Cancel;
break;
case MessageBoxButtons.OK:
default:
button1 = new Button();
button1.Text = "确定(&O)";
button1.Height = 20;
button1.DialogResult = DialogResult.OK;
break;
}
int ypos = this.Height - button1.Height - 30 - 10;
/* 窗体高度 - 按钮高度 - 窗体标题栏高度 - 距底调节高度 */
if (button3 != null)
{
button1.Location = new Point((this.Width - (button1.Width + 5) * 3) / 2, ypos);
button2.Location = new Point(button1.Location.X + button1.Width + 5, ypos);
button3.Location = new Point(button2.Location.X + button2.Width + 5, ypos);
button1.Click += new EventHandler(Right_Close_Click);
button2.Click += new EventHandler(Right_Close_Click);
button3.Click += new EventHandler(Right_Close_Click);
this.CancelButton = button2;
this.Controls.Add(button2);
this.Controls.Add(button3);
}
else if (button2 != null)
{
button1.Location = new Point((this.Width - (button1.Width + 5) * 2) / 2, ypos);
button2.Location = new Point(button1.Location.X + button1.Width + 5, ypos);
button1.Click += new EventHandler(Right_Close_Click);
button2.Click += new EventHandler(Right_Close_Click);
this.CancelButton = button2;
this.Controls.Add(button2);
}
else
{
button1.Location = new Point((this.Width - button1.Width) / 2, ypos);
button1.Click += new EventHandler(Right_Close_Click);
}
this.AcceptButton = button1;
this.Controls.Add(button1);
if (BoxDefaultButton == MessageBoxDefaultButton.Button1)
button1.Focus();
else if (BoxDefaultButton == MessageBoxDefaultButton.Button2)
{
if (button2 == null)
button1.Focus();
else
button2.Focus();
}
else if (BoxDefaultButton == MessageBoxDefaultButton.Button3)
{
if (button3 == null)
button1.Focus();
else
button3.Focus();
}
}
/// <summary>
/// 根据要显示的对话框类型，播放声音
/// </summary>
private void _PlaySound()
{
if (BoxIcon == MessageBoxIcon.Asterisk || BoxIcon == MessageBoxIcon.Information)
{
System.Media.SystemSounds.Asterisk.Play();
}
else if (BoxIcon == MessageBoxIcon.Error || BoxIcon == MessageBoxIcon.Stop || BoxIcon == MessageBoxIcon.Hand)
{
System.Media.SystemSounds.Hand.Play();
}
else if (BoxIcon == MessageBoxIcon.Exclamation || BoxIcon == MessageBoxIcon.Warning)
{
System.Media.SystemSounds.Exclamation.Play();
}
else if(BoxIcon == MessageBoxIcon.Question)
{
System.Media.SystemSounds.Question.Play();
}
}
/// <summary>
/// 屏蔽单击窗体关闭按钮关闭窗体
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Right_Close_Click(object sender, EventArgs e)
{
_CanClose = true;
}
#endregion
}
#region 字段
#endregion
#region 属性
#endregion
#region
static MessageBoxFrmEx()
{
}
#endregion
#region 公共方法
public static DialogResult Show(IWin32Window owner , string text)
{
return new MessageBoxFrm(owner, text).ShowDialog();
}
public static DialogResult Show( string text)
{
return new MessageBoxFrm(null, text).ShowDialog();
}
public static DialogResult Show(IWin32Window owner, string text, string caption)
{
return new MessageBoxFrm(owner, text, caption).ShowDialog();
}
public static DialogResult Show( string text, string caption)
{
return new MessageBoxFrm(null, text, caption).ShowDialog();
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons)
{
return new MessageBoxFrm(owner, text, caption, buttons, MessageBoxIcon.None, MessageBoxDefaultButton.Button1).ShowDialog();
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons)
{
return new MessageBoxFrm(null, text, caption, buttons, MessageBoxIcon.None, MessageBoxDefaultButton.Button1).ShowDialog();
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
{
return new MessageBoxFrm(owner, text, caption, buttons, icon, MessageBoxDefaultButton.Button1).ShowDialog();
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
{
return new MessageBoxFrm(null, text, caption, buttons, icon, MessageBoxDefaultButton.Button1).ShowDialog();
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon,MessageBoxDefaultButton defaultButton)
{
return new MessageBoxFrm(owner, text, caption, buttons, icon, defaultButton).ShowDialog();
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
{
return new MessageBoxFrm(null, text, caption, buttons, icon, defaultButton).ShowDialog();
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions option)
{
throw new NotImplementedException("不支持指定MessageBoxOptions");
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions option)
{
throw new NotImplementedException("不支持指定MessageBoxOptions");
}
#endregion
#region 私有方法
#endregion
}
此段代码 求测试