public class TextBoxInt : TextBox

     {

         public TextBoxInt()

         {

             KeyDown += TextBoxInt_KeyDown;

             TextChanged += TextBoxInt_TextChanged;

         }

         private void TextBoxInt_TextChanged(object sender, TextChangedEventArgs e)

         {

             //屏蔽非法字符粘贴

             var textBox = sender as TextBox;

             if (textBox != null)

             {

                 var change = new TextChange[e.Changes.Count];

                 e.Changes.CopyTo(change, );

                 int offset = change[].Offset;

                 if (change[].AddedLength > )

                 {

                     int num;

                     if (!int.TryParse(textBox.Text, out num))

                     {

                         textBox.Text = textBox.Text.Remove(offset, change[].AddedLength);

                         textBox.Select(offset, );

                     }

                 }

             }

         }

         private void TextBoxInt_KeyDown(object sender, KeyEventArgs e)

         {

             if (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)

             {

                 // 允许输入数字小键盘上的数字0-9

                 e.Handled = false;

             }

             else if ((e.Key >= Key.D0 && e.Key <= Key.D9) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)

             {

                 // 允许输入数字0-9，并且不能同时按着Shift键

                 e.Handled = false;

             }

             else if (e.Key == Key.Enter)

             {

                 // 允许输入回车

                 e.Handled = false;

             }

             else

             {

                 e.Handled = true;

             }

         }

     }