Question

我正在尝试验证一些控件，当我输入断点并运行应用程序时，我的customValidation类被调用，我可以通过我的断点，逻辑似乎工作正常但是当我在文本框中输入数据时，UpdateSourceTrigger不会火和文本框边框仍然是红色，我发布我的代码请告诉我我做错了什么。

自定义类：

 public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
    {
       // try
        //{
            string letter = "/[a-zA-Z]/";
            string number = "/[0-9]/";
            string val = null;
            if (value != null)
            {
              val = value.ToString();
            }
            String regex="/^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/";
            if(this.ControlName.ToString()=="username")
            {
                    if (val == "" || val == null )
                    {
                        return new ValidationResult(false, "Please enter a valid Username ");
                    }
            }
            else if(this.ControlName.ToString()=="password")
            {

                    if (val == null || val == "" || val.Length < 4 || val.Length > 15 )
                    {
                        return new ValidationResult(false, "Please enter a Valid password");
                    }
            }
            return new ValidationResult(true, null);
       // }
    }

XAML页面：

<TextBox HorizontalAlignment="Stretch"  Grid.Column="1" Grid.Row="3" Name="txtusername" Height="23" TextWrapping="Wrap" VerticalAlignment="Center" >
                <TextBox.Text>
                    <Binding Mode="TwoWay" Path="username" UpdateSourceTrigger="PropertyChanged" ValidatesOnDataErrors="True" ValidatesOnNotifyDataErrors="True" NotifyOnValidationError="True">
                        <Binding.ValidationRules>
                            <local:CustomValidator ControlName="username" ValidatesOnTargetUpdated="True"/>
                        </Binding.ValidationRules>
                    </Binding>
                </TextBox.Text>
            </TextBox>

Answer 1

此代码适用于我：

<TextBox HorizontalAlignment="Stretch" Name="txtusername" Height="23" TextWrapping="Wrap" VerticalAlignment="Center" >
            <TextBox.Text>
                <Binding Path="username" UpdateSourceTrigger="PropertyChanged">
                    <Binding.ValidationRules>
                        <l:CustomValidator ControlName="username" />
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>



public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new Test();
        }
    }

    public class Test
    {
        public string username { get; set; }
    }

    public class CustomValidator : ValidationRule
    {
        public string ControlName { get; set; }

        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            string letter = "/[a-zA-Z]/";
            string number = "/[0-9]/";
            string val = null;
            if (value != null)
            {
                val = value.ToString();
            }

            String regex = "/^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/";
            if (this.ControlName.ToString() == "username")
            {
                if (val == "" || val == null)
                {
                    return new ValidationResult(false, "Please enter a valid Username ");
                }
            }
            else if (this.ControlName.ToString() == "password")
            {
                if (val == null || val == "" || val.Length < 4 || val.Length > 15)
                {
                    return new ValidationResult(false, "Please enter a Valid password");
                }
            }

            return new ValidationResult(true, null);
        }
    }

WPF验证UpdateSourceTrigger不会触发

1 个答案: