ValidationContext

.NET 4 和Silverlight 中可以使用以下方法:

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public static void Validate(this Entity entity)

{

    // prepare the result

    var validationResults = new List<ValidationResult>();

    // create a validation context

    var validationContext = new ValidationContext(entity, null, null);

    // validate

    Validator.TryValidateObject(entity, validationContext, validationResults);

    // reset the validation errors of the entity

    entity.ValidationErrors.Clear();

    foreach (var error in validationResults)

        entity.ValidationErrors.Add(error);

}

.NET 3.5中的方法：

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public static class EntityValidator

{

    public static IEnumerable<ErrorField> GetErrors(object instance)

    {

        var t = instance.GetType();

        var typeDescriptor = new AssociatedMetadataTypeTypeDescriptionProvider(t).GetTypeDescriptor(t);

 

        return from prop in typeDescriptor.GetProperties().Cast<PropertyDescriptor>()

                 from attribute in prop.Attributes.OfType<ValidationAttribute>()

                 where !attribute.IsValid(prop.GetValue(instance))

                 select new ErrorField(prop.Name, attribute.FormatErrorMessage(string.Empty));

    }  

}

 

[Serializable]

public class ErrorField

{

    public string ID { get; set; }

     

    public string Msg { get; set; }

 

    public ErrorField(string id, string msg)

    {

        this.ID = id;

        this.Msg = msg;

    }

 

 

}