/// <summary>
/// 用户信息
/// </summary>
public class User
{
 [DbKey]
 public string Id { get; set; }
 public string Name { get; set; }
}

namespace CustomerAttribute
{
 /// <summary>
 /// 数据库主键
 /// </summary>
 public class DbKey : Attribute
 {
 public string Description { get; set; }
 public DbKey()
 {
 }
 public DbKey(string description)
 {
 this.Description = description;
 }
 }
}

namespace CustomerAttribute
{
 /// <summary>
 /// 用户信息
 /// </summary>
 public class User
 {
 [DbKey]
 public string Id { get; set; }
 public string Name { get; set; }
 }
 /// <summary>
 /// 用户角色
 /// </summary>
 public class UserRole
 {
 [DbKey("用户ID")]
 public string UserId { get; set; }
 [DbKey("角色ID")]
 public string RoleId { get; set; }
 }
}

namespace CustomerAttribute
{
 class Program
 {
 /// <summary>
 /// 获取数据库主键字段
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <returns></returns>
 private static IEnumerable<PropertyInfo> getDbKeyFields<T>()
 {
 // 获取当前类中的公共字段
 var fields = typeof(T).GetProperties();
 // 查找有DbKey特性的字段
 var keyFields = fields.Where(field => (DbKey)Attribute.GetCustomAttribute(field, typeof(DbKey)) != null);
 return keyFields;
 }
 private static string getDescription(PropertyInfo field)
 {
 string result = string.Empty;
 var dbKey = (DbKey)Attribute.GetCustomAttribute(field, typeof(DbKey));
 if (dbKey != null) result = dbKey.Description;
 return result;
 }
 static void Main(string[] args)
 {
 try
 {
 var userKeyFields = getDbKeyFields<User>();
 Console.WriteLine("User表的主键为:" + string.Join(",", userKeyFields.Select(field => field.Name)));
 var userRoleKeyFields = getDbKeyFields<UserRole>();
 Console.WriteLine("UserRole表的主键为:" + string.Join(",", userRoleKeyFields.Select(field => field.Name)));
 foreach (PropertyInfo field in userRoleKeyFields)
 {
 string description = getDescription(field);
 Console.WriteLine(string.Format("{0}字段的描述信息为:{1}", field.Name, description));
 }
 }
 catch (Exception ex)
 {
 Console.WriteLine(ex);
 }
 finally
 {
 Console.ReadLine();
 }
 }
 }
}