用keyDown事件 private void TextBox_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if (e.Key != Key.Back && e.Key < Key.D0 || e.Key > Key.D9 && e.Key < Key.NumPad0 || e.Key > Key.NumPad9)
            {
                e.Handled = true;
            }
        }

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C# code

用keyDown事件 private void TextBox_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if (e.Key != Key.Back &amp;&amp; e.Key < Key.D0 || e.Key > Key.D9 &amp;&a……


------解决方案--------------------
C# code
/// <summary>
  /// 限制输入数字以外的字符
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void textbox_KeyPress(object sender, KeyPressEventArgs e)
  {
  if (((int)e.KeyChar < 48 || (int)e.KeyChar > 57) && e.KeyChar != 8)
  {
  e.Handled = true;
  }
  }