当用户在文本框中输入ssn时添加破折号。无法使用delete\backbutton删除hyphons [英] Add dashes when user is entering ssn in a text box.unable to delete hyphons using delete\backbutton

问题描述

当用户在文本框中输入ssn时，我有一个XAML要求添加破折号。我尝试下面的代码，能够添加短划线，但无法从文本框中删除破折号。每当我尝试删除或使用后退空间连字符都不会被删除



我尝试过：



XAML：

Hi I have a XAML requirement to add dashes when user is entering ssn in a text box. I tried below code, am able to add dashes, but unable to delete dashes from text box. Whenever i try to delete or use back space hyphens are not deleted

What I have tried:

XAML:

<Window x:Class="WpfApplication2.MainWindow"                  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    Title="MainWindow" Height="350" Width="525">
    <grid>
    <TextBox HorizontalAlignment="Left" Height="23"                    Margin="10,10,0,0"

    TextWrapping="Wrap" Name="Txtssn"

    Text=""

                                 MaxLength="11"

                                 VerticalAlignment="Top"

                                 Width="120"

                                 TextChanged="TextBox_TextChanged"/>

C＃：

C#:

using System.Windows;
using System.Windows.Controls;

namespace WpfApplication2
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            var textBox = sender as TextBox;

            string data = textBox.Text;

            if (data.Length == 3)
            {
                string formattedSSN = data.Insert(3, "-");
                Txtssn.Text = formattedSSN.ToString();
                textBox.Focus();
                textBox.SelectionStart = textBox.Text.Length;
            }
            else if (data.Length == 6)
            {
                string formattedSSN = data.Insert(6, "-");
                Txtssn.Text = formattedSSN.ToString();
                textBox.Focus();
                textBox.SelectionStart = textBox.Text.Length;
}}}

推荐答案

为了正确添加或删除你应该处理的连字符，例如< a href =https://msdn.microsoft.com/en-us/library/system.windows.uielement.keydown(v=vs.110).aspx> UIElement.KeyDown事件（System.Windows） [ ^ ]。在事件处理程序中，检查用户是否正在添加文本或将其删除（按下退格键）。此外，您还需要考虑是否按下删除键和/或是否选择了文本区域和文本中的插入位置。



有相当的几个例子，如如何实施WPF中文本框的掩码 [ ^ ]。但是，也许最简单的方法是使用扩展WPF工具包的现成控件[ ^ ]

In order to correctly add or remove the hyphen you should handle for example UIElement.KeyDown Event (System.Windows)[^] . In the event handler, check if the user is adding text or removing it (backspace pressed). Also you need to take into consideration if delete key is pressed and/or if an area of text is selected and the caret position in the text.

There are quite a few example, like How To Implement a Mask for a Text Box in W.P.F.[^]. However, perhaps the easiest way would be to use a ready made control from Extended WPF Toolkit™[^]

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