C# 派生的RequiredAttribute不'；行不通

我正在尝试实现自己的RequiredAttribute，在其中我调用了一个自定义资源处理程序：

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);
    }

}

我这样称呼它：

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

但是ErrorMessage的getter永远不会被调用

有什么提示吗？谢谢

试着这样做：

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

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

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

或者像这样：

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

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; }