WPF限制文本框只能输入数字

在一个程序中有时候文本框需要添加限制，比如需要限制文本框只能输入数字，限制文本框只能输入数字和字母等等。先来介绍文本框只能输入数字

<TextBox    PreviewTextInput="UserName_PreviewTextInput"  //限制输入特殊字符
                         PreviewKeyDown="Space_PreviewKeyDown" //限制输入空格
                          InputMethod.IsInputMethodEnabled="False" >

                <TextBox.CommandBindings>//禁止复制粘贴
                    <CommandBinding  Command="ApplicationCommands.Paste" CanExecute="CommandBinding_CanExecute"/>
                    <CommandBinding  Command="ApplicationCommands.Copy" CanExecute="CommandBinding_CanExecute"/>
                    <CommandBinding  Command="ApplicationCommands.Cut" CanExecute="CommandBinding_CanExecute"/>
                </TextBox.CommandBindings>
           

</TextBox>

需要类

public class TextRestrict
    {
        

        /// <summary>
        /// 禁止文本框复制粘贴
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void Prohibit(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = false;
            e.Handled = true;
        }



        
        /// <summary>
        /// 鼠标按下事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void ButtonDown(PasswordBox pwd, TextBox txt)
        {
            txt.Text = pwd.Password;
            txt.IsEnabled = true;
            txt.Visibility = Visibility.Visible;
            pwd.IsEnabled = false;
            pwd.Visibility = Visibility.Hidden;
        }

        #endregion

        public void SpaceKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Space)
            {
                e.Handled = true;
            }
        }

       
    }
        }
       

在根据textbox中的所写的属性写方法

限制输入空格
TextRestrict text = new TextRestrict();
 private void Space_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            text.SpaceKeyDown(sender, e);
        }

限制特殊字符
 private void UserName_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            Astrict astrict = new Astrict();
            astrict.Number(sender, e);
        }

禁止粘贴复制
 private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {

            text.Prohibit(sender, e);
        }