WPF动态文本框验证

时间:2017-06-15 16:39:29

标签: c# wpf xaml

我不清楚wpf中的验证规则是如何运作的。似乎我错过了很多。我正在学习一个关于“#34;文本框是必需的"验证TextBox。

本教程已在xaml上完成。但是,我在后面的代码(C#)中创建了动态文本框。

在Xaml中我添加了以下资源

<UserControl.Resources>
    <ControlTemplate x:Key="validationTemplate">
        <DockPanel>
            <TextBlock Foreground="Red" FontSize="25" Text="*" DockPanel.Dock="Right"></TextBlock>
            <AdornedElementPlaceholder/>
        </DockPanel>
    </ControlTemplate>

    <Style x:Key="InputControlErrors" TargetType="{x:Type TextBox}">
        <Style.Triggers>
            <Trigger Property="Validation.HasError" Value="true">
                <Setter Property="ToolTip"    
          Value="{Binding RelativeSource={x:Static RelativeSource.Self},    
                          Path=(Validation.Errors)[0].ErrorContent}"/>
            </Trigger>
        </Style.Triggers>
    </Style>
</UserControl.Resources>

另外,我添加了验证类

 public class RequiredFiedValidationRule : ValidationRule {
 public RequiredFiedValidationRule() {

  }
  public override ValidationResult Validate(object value, CultureInfo cultureInfo) {
      if (value.ToString().Length > 0) {
          return new ValidationResult(true, null);
      }
      else {
          return new ValidationResult(false, "Required Field Validation");
      }
  }
}

在我的代码的这一部分中,我在for循环中生成Textboxes。本教程在Xaml中完成了所有绑定,并且在创建每个TextBox期间我尝试在我的代码中执行相同的操作。代码符号没有错误但在验证部分没有结果(它仍然接受空值)。注意:这只是for循环中代码的一部分,我删除了不重要的内容。

 foreach (Department department in Departments) { 
            TextBox textBox = new TextBox();
            textBox.Name = "Department" + department.Id.ToString();
            textBox.Width = 70;
            textBox.MaxWidth = 70;
            textBox.HorizontalAlignment = HorizontalAlignment.Center;
            textBox.VerticalAlignment = VerticalAlignment.Center;
            Grid.SetColumn(textBox, 1);
            Grid.SetRow(textBox, row);

            //me trying to attache the validation rule with no luck :(

            Validation.SetErrorTemplate(textBox, this.FindResource("validationTemplate") as ControlTemplate);
            textBox.Style= this.FindResource("InputControlErrors") as Style;
            Binding binding = new Binding();
            binding.Source = this;
            binding.Path = new PropertyPath(textBox.Name);
            binding.Mode = BindingMode.TwoWay;
            binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            RequiredFiedValidationRule textBoxRequiredRule = new RequiredFiedValidationRule();
            binding.ValidationRules.Add(textBoxRequiredRule);
            BindingOperations.SetBinding(textBox, TextBox.TextProperty, binding);
            NCRGrid.Children.Add(textBox);
        }
    }
说实话,我不确定我在验证部分做了什么,我只是想让它发挥作用。

1 个答案:

答案 0 :(得分:1)

您需要将Text的{​​{1}}属性绑定到源属性才能使验证生效。

TextBox类应该有Department属性,我们称之为stringName绑定到:{/ p>

TextBox