反射测试

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样本：

    public class PrimaryKeyAttribute : Attribute    { }    public class DbColumnAttribute : Attribute    {        public string Name { get; set; }        public DbColumnAttribute(string name)        {            this.Name = name;        }    }    public class Client    {        [PrimaryKey]        [DbColumn("client_id")]        public int ClientId { get; set; }        [DbColumn("last_name")]        public string LastName { get; set; }        [DbColumn("first_name")]        public string FirstName { get; set; }        [DbColumn("email")]        public string Email { get; set; }    }

代码：

        static void Test3()        {            var client = new Client() { ClientId = 2, LastName = "James", FirstName = "jon", Email = "jon@163.com" };            WritePK<Client>(client);            Console.WriteLine();            WriteColumnMappings<Client>(client);        }        public static void WritePK<T>(T item) where T : new()        {            var type = item.GetType();            var queryPts = type.GetProperties();            Console.WriteLine("Finding PK for {0} ...", type.Name);            var pk = queryPts.FirstOrDefault(x =>                        x.GetCustomAttributes(false).Any(                            a => a.GetType() == typeof(PrimaryKeyAttribute)                        )                    );            if (pk != null)            {                string msg = "The Primary Key for the {0} class is the {1} property";                Console.WriteLine(msg, type.Name, pk.Name);            }        }        public static void WriteColumnMappings<T>(T item) where T : new()        {            var type = item.GetType();            var queryPts = type.GetProperties();            Console.WriteLine("Finding properties for {0} ...", type.Name);            foreach (var p in queryPts)            {                var attributes = p.GetCustomAttributes(false); //获取属性的特性                var columnMapping = attributes.FirstOrDefault(a =>                                        a.GetType() == typeof(DbColumnAttribute)                                    );                if (columnMapping != null)                {                    string msg = "the {0} property maps to the {1} database column";                    var mapsto = columnMapping as DbColumnAttribute;                    Console.WriteLine(msg, p.Name, mapsto.Name);                }            }        }

结果：

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