派生的RequiredAttribute不起作用
我正在尝试实现自己的RequiredAttribute，我在其中调用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); } } 我用以下方式称呼它：
[LocalizedValidationAttributes.LocalizedRequiredAttribute(ErrorMessage = "test")] public String Text { get; set; }
但是从不调用ErrorMessage的getter。
任何提示？ 谢谢！
试试这样：
public class LocalizedRequiredAttribute : RequiredAttribute { public override string FormatErrorMessage(string name) { return ResourceManager.Current.GetResourceString(name); } }
或者像这样：
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; }