DataReader数据反射成实体List

再灌一篇,把DataReader取的数据反射成List<entity>

 

   public class ListEx<T> : List<T>
    {
        /// <summary>
        /// 从DataReader中加载数据
        /// </summary>
        /// <param name="reader"></param>
        public void Load(IDataReader reader)
        {
            this.Clear();
            while (reader.Read())
            {
                //获取字段总数
                int colCount = reader.FieldCount;
                //获取实体类型
                Type objType = typeof(T);
                //实例化实体
                ConstructorInfo constructor = objType.GetConstructor(Type.EmptyTypes);
                T entity = (T)constructor.Invoke(null);
                //给实体赋值
                for (int i = 0; i < colCount; i++)
                {
                    PropertyInfo property = objType.GetProperty(reader.GetName(i));
                    if (property != null)
                    {
                        property.SetValue(entity, reader[i], null);
                    }
                }
                //将实体添加至集合中
                this.Add(entity);
            }
            reader.Dispose();
        }
    }