DataReader反射泛型对象

 1     public List<T> ToList<T>(string _sql) where T :class ,new()
 2         {
 3             
 4             using (var conn = new SqlConnection(connStr))
 5             {
 6                 using (var comm = new SqlCommand(_sql, conn))
 7                 {
 8                     conn.Open();
 9                     SqlDataReader dataReader = comm.ExecuteReader();
10                     if (dataReader.HasRows)
11                     {
12                         List<T> dataList = new List<T>();
13                         
14                         while ((dataReader.Read()))
15                         {
16                             T obj = new T();
17                             //获取泛型对象的所有属性
18                             var properties = obj.GetType().GetProperties();
19                             foreach (var property in properties)
20                             {
21                                 for (int i = 0; i < dataReader.FieldCount; i++)
22                                 {
23                                     //查找与属性名称相同的列
24                                     if (dataReader.GetName(i).Equals(property.Name,StringComparison.CurrentCultureIgnoreCase))
25                                     {
26                                         //给新建的obj对象的属性赋值
27                                         property.SetValue(obj,dataReader[i]);
28                                     }
29                                 }
30                             }
31                             dataList.Add(obj);
32                         }
33                         conn.Close();
34                         return dataList;
35                     }
36                   
37                 }
38             }
39             return null;
40         }