如何检查ItemsControl中的所有文本框是否有效

ValidationChecker 类,该类将使用检查是否存在验证错误 IsValid 方法

public class ValidationChecker : Freezable
{
    public static List<DependencyObject> elements = new List<DependencyObject>();

    public static int GetValidationObject(DependencyObject obj)
    {
        return (int)obj.GetValue(ValidationObjectProperty);
    }

    public static void SetValidationObject(DependencyObject obj, int value)
    {
        obj.SetValue(ValidationObjectProperty, value);
    }

    // Using a DependencyProperty as the backing store for ErrorCount.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty ValidationObjectProperty =
        DependencyProperty.RegisterAttached("ValidationObject", typeof(DependencyObject), typeof(ValidationChecker), new PropertyMetadata(null, OnValueChanged));


    public static bool IsValid()
    {
        foreach (var item in elements)
        {
            if (Validation.GetHasError(item)) return false;
        }
        return true;
    }

    private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        elements.Add(d);
    }

    protected override Freezable CreateInstanceCore()
    {
        return new ValidationChecker();
    }
}

ValidationObject

<DataTemplate>
    <TextBox local:ValidationChecker.ValidationObject="{Binding RelativeSource={RelativeSource Self}}">
         <TextBox.Text>
             <Binding Path="Value">
                 <Binding.ValidationRules>
                      <local:NotEmptyValidationRule ValidatesOnTargetUpdated="True"></local:NotEmptyValidationRule>
                 </Binding.ValidationRules>
              </Binding>
          </TextBox.Text>
       </TextBox>
</DataTemplate>

您已经提到您的 Button 已绑定到 Command . 所以实施 CanExecute 方法 ValidationChecker.Isvalid() . 别忘了调用 RaiseCanExecute 此方法 命令 只要你需要。