在 WPF PropertyGrid 中实现验证

发布于 2024-10-07 06:01:01 字数 309 浏览 4 评论 0原文

我已经实现了一个PropertyGrid，并且所选对象（在另一个库中）的属性显示在其中。属性值通过绑定绑定到 PropertyGrid 控件。现在，我想对用户在 PropertyGrid 控件（主要是 TextBox）中输入的值执行验证，并在值不正确时向用户显示一条消息。

会有一些常见的验证，如数值、必填字段等，以及一些与业务逻辑相关的验证（如值不能大于此等）。

有哪些方法可以实现此目的（IDataErrorInfo 或其他）？

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梦罢 2024-10-14 06:01:02

如果您已经在 ViewModel 上实现了 IDataErrorInfo，我发现此数据模板对于显示错误非常有用：

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

这样，您只需将 ValidatesOnDataErrors=True 设置为您的文本框绑定，如果有任何问题，您会收到一个显示错误的工具提示。这也可以应用于其他控件。

有关如何正确实现 IDataErrorInfo 的信息，请参见此处：
http://blogs .msdn.com/b/wpfsdk/archive/2007/10/02/data-validation-in-3-5.aspx
特别是看看“3.5 IDataErrorInfo Support”部分

If you already have implemented IDataErrorInfo on your ViewModels, I found this data-template to be quite useful for displaying errors:

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

That way, you only have to set ValidatesOnDataErrors=True on your textbox bindings and you get a tooltip displaying the error if anything is wrong. That can be applied to other controls as well.

For information on how to implement IDataErrorInfo properly, look here:
http://blogs.msdn.com/b/wpfsdk/archive/2007/10/02/data-validation-in-3-5.aspx
especially have a look at the section "3.5 IDataErrorInfo Support"

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鹿! 2024-10-14 06:01:02

我最近不得不处理这个问题，所以我将发布这个示例代码来帮助其他人解决同样的问题。

using System.Collections.Generic;
using System.ComponentModel;
using System.Text;

namespace ValidationExample
{

    public class SomeClass : DataErrorInfoImpl
    {
        [CustomValidation(typeof (SomeClassValidator), "ValidateSomeTextToValidate")]
        string SomeTextToValidate {get;set;}

    }

    public class SomeClassValidator
    {
        public static ValidationResult ValidateNumberOfLevelDivisons(string text)
        {
            if (text != "What every condition i want") return new ValidationResult("Text did not meet my condition.");
            return ValidationResult.Success;
        }

    }

    public class DataErrorInfoImpl : IDataErrorInfo
    {
        string IDataErrorInfo.Error { get { return string.Empty; } }

        string IDataErrorInfo.this[string columnName]
        {
            get
            {
                var pi = GetType().GetProperty(columnName);
                var value = pi.GetValue(this, null);

                var context = new ValidationContext(this, null, null) { MemberName = columnName };
                var validationResults = new List<ValidationResult>();
                if (!Validator.TryValidateProperty(value, context, validationResults))
                {
                    var sb = new StringBuilder();
                    foreach (var vr in validationResults)
                    {
                        sb.AppendLine(vr.ErrorMessage);
                    }
                    return sb.ToString().Trim();
                }
                return null;
            }
        }
    }
}

此样式应适用于 WPF Xceed.PropertyGrid 和 WPF PropertyTools.PropertyGrid。

I recently had to deal with this problem so I will post this example code to help others with the same problem.

using System.Collections.Generic;
using System.ComponentModel;
using System.Text;

namespace ValidationExample
{

    public class SomeClass : DataErrorInfoImpl
    {
        [CustomValidation(typeof (SomeClassValidator), "ValidateSomeTextToValidate")]
        string SomeTextToValidate {get;set;}

    }

    public class SomeClassValidator
    {
        public static ValidationResult ValidateNumberOfLevelDivisons(string text)
        {
            if (text != "What every condition i want") return new ValidationResult("Text did not meet my condition.");
            return ValidationResult.Success;
        }

    }

    public class DataErrorInfoImpl : IDataErrorInfo
    {
        string IDataErrorInfo.Error { get { return string.Empty; } }

        string IDataErrorInfo.this[string columnName]
        {
            get
            {
                var pi = GetType().GetProperty(columnName);
                var value = pi.GetValue(this, null);

                var context = new ValidationContext(this, null, null) { MemberName = columnName };
                var validationResults = new List<ValidationResult>();
                if (!Validator.TryValidateProperty(value, context, validationResults))
                {
                    var sb = new StringBuilder();
                    foreach (var vr in validationResults)
                    {
                        sb.AppendLine(vr.ErrorMessage);
                    }
                    return sb.ToString().Trim();
                }
                return null;
            }
        }
    }
}

This style should work on WPF Xceed.PropertyGrid and WPF PropertyTools.PropertyGrid.

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