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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;}#endregionpublic 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);
        }