RequiredAttribute标签派生不工作

本文介绍了RequiredAttribute标签派生不工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想实现我自己的RequiredAttribute标签，我在其中调用自定义的资源处理程序：

I'm trying to implement my own RequiredAttribute, in which I call a custom resource handler:

public class LocalizedValidationAttributes
{
    public class LocalizedRequiredAttribute : RequiredAttribute
    {
        private String _resourceString = String.Empty;

        public new String ErrorMessage
        {
            get { return _resourceString; }
            set { _resourceString = GetMessageFromResource(value); }
        }
    }

    private static String GetMessageFromResource(String resourceTag)
    {
        return ResourceManager.Current.GetResourceString(resourceTag);
    }

}

我把这个方式如下：

I call this the following way:

[LocalizedValidationAttributes.LocalizedRequiredAttribute(ErrorMessage = "test")]
public String Text { get; set; }

不过的ErrorMessage的吸气剂是永远不会被调用。

But the getter of ErrorMessage is never called.

任何提示？谢谢！

推荐答案

尝试这样的：

public class LocalizedRequiredAttribute : RequiredAttribute
{
    public override string FormatErrorMessage(string name)
    {
        return ResourceManager.Current.GetResourceString(name);
    }
}

或者是这样的：

or like this:

public class LocalizedRequiredAttribute : RequiredAttribute
{
    public LocalizedRequiredAttribute(string resourceTag)
    {
        ErrorMessage = GetMessageFromResource(resourceTag);
    }

    private static String GetMessageFromResource(String resourceTag)
    {
        return ResourceManager.Current.GetResourceString(resourceTag);
    }
}

然后：

[LocalizedValidationAttributes.LocalizedRequiredAttribute("test")]
public String Text { get; set; }

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