问题描述
我有一些关于 元数据类型.我有使用 LinqToSQL 从 MS SQL Server 访问数据的 DLL 帮助程序项目.我还需要为生成的类 ClientInfoView 添加元数据.我已经按照以下方式完成了:
I've got a some problem/question about MetadataType. I've got DLL helper-project for data access from MS SQL Server using LinqToSQL. I've also need to add a metadata for a generated class ClientInfoView. I've done it following way:
using System; using System.ComponentModel.DataAnnotations; using System.ComponentModel; namespace DataAPI.LINQToSQL { [MetadataType(typeof(ClientInfoViewMetaData))] public partial class ClientInfoView { internal sealed class ClientInfoViewMetaData { [Category("Main Data"), DisplayName("Client ID")] public int ID { get; set; } [Category("Main Data"), DisplayName("Login")] public string Login { get; set; } ... } } }
但是当我在运行时检查属性时,我发现 ClientInfoView 没有任何属性.
But when I checked the attributes in runtime, I've found that ClientInfoView hasn't got any attributes.
你能帮我找出错误吗?
推荐答案
要给出部分答案,您可以检查 ClientInfoView 是否具有属性.一些对我有用的小演示.仍在试图找出为什么我无法访问 ClientInfoViewMetaData 单个属性中的这些属性
To give some part of the answer , you can check ClientInfoView has got attributes. Some small demo that worked for me. Still trying to find why I can't access those attributes in ClientInfoViewMetaData individual properties
static void Main(string[] args) { TypeDescriptor.AddProviderTransparent( new AssociatedMetadataTypeTypeDescriptionProvider(typeof(ClientInfoView), typeof(ClientInfoViewMetaData)), typeof(ClientInfoView)); ClientInfoView cv1 = new ClientInfoView() { ID = 1 }; var df = cv1.GetType().GetCustomAttributes(true); var dfd = cv1.ID.GetType().GetCustomAttributes(typeof(DisplayNameAttribute), true); var context = new ValidationContext(cv1, null, null); var results = new List<ValidationResult>(); var isValid = Validator.TryValidateObject( cv1,context, results, true); } } [MetadataType(typeof(ClientInfoViewMetaData))] public partial class ClientInfoView { public int ID { get; set; } public string Login { get; set; } } public class ClientInfoViewMetaData { [Required] [Category("Main Data"), DisplayName("Client ID")] public int ID { get; set; } [Required] [Category("Main Data"), DisplayName("Login")] public string Login { get; set; } }