Question

我正在尝试在WPF应用程序（这是Solidworks的插件）中实现输入验证。我使用此示例作为参考，我相信我已正确应用它-https://developingfor.net/2009/10/13/using-custom-validation-rules-in-wpf/。我代码中的规则应检查文本框中的输入是否为整数。但是，由于某些原因，验证检查不会触发。我在代码中放置了断点，但它从未运行过验证功能。我的WPF的相关部分：

<UserControl x:Class="SolidworksPlugin.MyAddInControl" 
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Solidworks_Plugin"
             xmlns:ValidationRules="clr-namespace:CustomValidationRules"
             mc:Ignorable="d" 
             Height="600" Width="300">

    <StackPanel>
        <TextBox
            x:Name="Int1TextBox"
            VerticalAlignment="Center"
            HorizontalAlignment="Center"
            MinWidth="50"
            Margin="0,0,6,0">
            <Binding
                Path="Int1"
                UpdateSourceTrigger="PropertyChanged"
                Mode="TwoWay">
                <Binding.ValidationRules>
                    <ValidationRules:IntegerValidationRule
                        Min="1"
                        Max="9999999"
                        FieldName="Int1" 
                    />
                </Binding.ValidationRules>
            </Binding>
        </TextBox>
    </StackPanel>

</UserControl>

以及此WPF为验证规则引用的InputValidator类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Controls;

namespace CustomValidationRules
{
    public class IntegerValidationRule : ValidationRule
    {
        private int _min = int.MinValue;
        private int _max = int.MaxValue;
        private string _fieldName = "Field";
        private string _customMessage = String.Empty;

        public int Min
        {
            get { return _min; }
            set { _min = value; }
        }

        public int Max
        {
            get { return _max; }
            set { _max = value; }
        }

        public string FieldName
        {
            get { return _fieldName; }
            set { _fieldName = value; }
        }

        public string CustomMessage
        {
            get { return _customMessage; }
            set { _customMessage = value; }
        }


        public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
        {
            int num = 0;

            if (!int.TryParse(value.ToString(), out num))
                return new ValidationResult(false, String.Format("{0} must contain an integer value.", FieldName));

            if (num < Min || num > Max)
            {
                if (!String.IsNullOrEmpty(CustomMessage))
                    return new ValidationResult(false, CustomMessage);


                return new ValidationResult(false, String.Format("{0} must be between {1} and {2}.",
                                           FieldName, Min, Max));
            }

            return new ValidationResult(true, null);
        }
    }
}

编译器不会引发任何错误，并且当我在该文本框中写入任何内容时，验证规则将不起作用。从未达到Validate()。我的错误在哪里？

Answer 1

您提供的示例代码对我来说很好用，我在ValidationRule中遇到了断点。

我使用此MainWindow代码测试了Binding：

<Window x:Class="SolidworksPlugin.MainWindow"
        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"
        x:Name="window"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        Topmost="True"
        RenderTransformOrigin="0 0">
    <Grid>
        <MyAddInControl></MyAddInControl>
    </Grid>
</Window>

和下面的示例代码创建一个ViewModel：

public partial class MainWindow : Window {

    public MainWindow() {
        InitializeComponent();
        DataContext = new MyViewModel();
    }
}

public class MyViewModel {
    public int Int1 { get; set; }
}

如果ValidationRule本身无法正确解析，则不会调用Binding，因此请检查您的视图模型是否确实具有名为Int1的属性以及{{1 }}正确设置为该视图模型。

C＃WPF自定义验证规则不会触发

1 个答案: