c# - MessageBox 中的粗体文本

Question

如何使用 C# 在 MessageBox.Show 显示的对话框中以粗体显示文本？

Answer 1

有可能，消息框是一个常规窗口，可以像其他任何窗口一样被弄乱。然而，这样做的代码有点粗糙。向您的项目添加一个新类并粘贴此代码:

using System;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;

class BoldMessageBox : IDisposable {
  private int mTries = 0;
  private Form mOwner;
  private Font mFont;

  public BoldMessageBox(Form owner) {
    mOwner = owner;
    owner.BeginInvoke(new MethodInvoker(findDialog));
  }

  private void findDialog() {
    // Enumerate windows to find the message box
    if (mTries < 0) return;
    EnumThreadWndProc callback = new EnumThreadWndProc(checkWindow);
    if (EnumThreadWindows(GetCurrentThreadId(), callback, IntPtr.Zero)) {
      if (++mTries < 10) mOwner.BeginInvoke(new MethodInvoker(findDialog));
    }
  }
  private bool checkWindow(IntPtr hWnd, IntPtr lp) {
    // Checks if <hWnd> is a dialog
    StringBuilder sb = new StringBuilder(260);
    GetClassName(hWnd, sb, sb.Capacity);
    if (sb.ToString() != "#32770") return true;
    // Got it, get the STATIC control that displays the text
    IntPtr hText = GetDlgItem(hWnd, 0xffff);
    if (hText != IntPtr.Zero) {
      // Get the current font
      IntPtr hFont = SendMessage(hText, WM_GETFONT, IntPtr.Zero, IntPtr.Zero);
      Font font = Font.FromHfont(hFont);
      // And make it bold (note the size change to keep enough space!!)
      mFont = new Font(font.FontFamily, font.SizeInPoints - 1f, FontStyle.Bold);
      SendMessage(hText, WM_SETFONT, mFont.ToHfont(), (IntPtr)1);
    }
    // Done
    return false;
  }
  public void Dispose() {
    mTries = -1;
    mOwner = null;
    if (mFont != null) mFont.Dispose();
  }

  // P/Invoke declarations
  private const int WM_SETFONT = 0x30;
  private const int WM_GETFONT = 0x31;
  private delegate bool EnumThreadWndProc(IntPtr hWnd, IntPtr lp);
  [DllImport("user32.dll")]
  private static extern bool EnumThreadWindows(int tid, EnumThreadWndProc callback, IntPtr lp);
  [DllImport("kernel32.dll")]
  private static extern int GetCurrentThreadId();
  [DllImport("user32.dll")]
  private static extern int GetClassName(IntPtr hWnd, StringBuilder buffer, int buflen);
  [DllImport("user32.dll")]
  private static extern IntPtr GetDlgItem(IntPtr hWnd, int item);
  [DllImport("user32.dll")]
  private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);
}

然后像这样使用它:

private void button1_Click(object sender, EventArgs e) {
  using (new BoldMessageBox(this)) {
    MessageBox.Show("Nobugz waz here");
  }
}

这种方法有一个缺陷。将字体设为粗体后，文本仍必须适合消息框为文本保留的静态控件。这要求我把字体变小。您可能需要调整此值。