如何使用WPF和C＃对文本框条目仅接受数字，逗号，点和退格 [英] How can I do to textbox entry accept only number, comma, point and backspace with WPF and C#

问题描述

我有一个WPF表单。我需要做一些控件文本框只接受数字，点，逗号和退格。我对此有些困惑，因为我知道winform和winform代码在WPF项目中不起作用。 

解决方案

您可以尝试使用

希望它有所帮助。

最诚挚的问候，

Bob

I have a form with WPF. I need to do some controls textbox to accept only number, point, comma and backspace. I'm having some dificult with this, because I know winform and winform code do not work in WPF project. 

解决方案

Hi，

You can try to use ValidationRule Class to create a custom rule in order to check the validity of user input.

Below sample for your reference.

namespace wpfAppDemo.wpfDataValidation
{
   
    public partial class sample1 : Window
    {
        public sample1()
        {
            InitializeComponent();
        }
    }
    public class sample1_ViewModel
    {
        private string _name;

        public string Name
        {
            get { return _name; }
            set
            {
                _name = value;
            }
        }
    }
    public class StringValidationRule : ValidationRule
    {
        private string _errorMessage;
        public string ErrorMessage
        {
            get { return _errorMessage; }
            set { _errorMessage = value; }
        }
        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            string input = value.ToString();
            bool rt = Regex.IsMatch(input, "^[0-9.,\\s]*

"); if (!rt) { return new ValidationResult(false,this.ErrorMessage); } else { return new ValidationResult(true, null); } } } }

<Window x:Class="wpfAppDemo.wpfDataValidation.sample1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:wpfAppDemo.wpfDataValidation"
        mc:Ignorable="d"
        Title="sample1" Height="300" Width="500">
    <Window.DataContext>
        <local:sample1_ViewModel/>
    </Window.DataContext>
    <StackPanel>
        <!--PropertyChanged-->
        <TextBox Height="20" Margin="20" >
            <TextBox.Style>
                <Style TargetType="{x:Type TextBox}">
                    <Setter Property="Validation.ErrorTemplate">
                        <Setter.Value>
                            <ControlTemplate>
                                <DockPanel LastChildFill="True">
                                    <TextBlock  DockPanel.Dock="Bottom" Foreground="Red" FontSize="10pt" Text="{Binding ElementName=MyAdorner,Path=AdornedElement.(Validation.Errors)[0].ErrorContent}">
                                    </TextBlock>
                                    <Border  BorderBrush="Red" BorderThickness="2">
                                        <AdornedElementPlaceholder Name="MyAdorner" />
                                    </Border>
                                </DockPanel>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </TextBox.Style>
            <TextBox.Text>
                <Binding Path="Name" UpdateSourceTrigger="PropertyChanged">
                    <Binding.ValidationRules>
                        <local:StringValidationRule  ErrorMessage="input should only include number, comma, point and backspace " />
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>
    </StackPanel>
</Window>

How to: Implement Binding Validation

Hope it helps.

Best Regards,

Bob

这篇关于如何使用WPF和C＃对文本框条目仅接受数字，逗号，点和退格的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！