读取数据库返回泛型集合 把DataSet类型转换为List<T>泛型集合

转自 http://www.cnblogs.com/wuhuisheng/archive/2012/04/26/2471733.html

  1 /// <summary>
  2         /// 获取UserInfo泛型集合
  3         /// </summary>
  4         /// <param name="connStr">数据库连接字符串</param>
  5         /// <param name="sqlStr">要查询的T-SQL</param>
  6         /// <returns></returns>
  7         public IList<UserInfo> GetUserInfoAll(string connStr, string sqlStr)
  8         {
  9             using (SqlConnection conn = new SqlConnection(connStr))
 10             {
 11                 using (SqlCommand cmd = new SqlCommand(sqlStr, conn))
 12                 {
 13                     SqlDataReader sdr = cmd.ExecuteReader();
 14
 15                     IList<UserInfo> list = new List<UserInfo>();
 16
 17                     while (sdr.Read())
 18                     {
 19
 20                         UserInfo userInfo = new UserInfo();
 21
 22                         userInfo.ID = (Guid)sdr["ID"];
 23
 24                         userInfo.LoginName = sdr["LoginName"].ToString();
 25
 26                         userInfo.LoginPwd = sdr["LoginPwd"].ToString();
 27
 28                         list.Add(userInfo);
 29
 30                     }
 31                     return list;
 32                 }
 33             }
 34         }
 35
 36         /// <summary>
 37         /// 获取泛型集合
 38         /// </summary>
 39         /// <typeparam name="T">类型</typeparam>
 40         /// <param name="connStr">数据库连接字符串</param>
 41         /// <param name="sqlStr">要查询的T-SQL</param>
 42         /// <returns></returns>
 43         public IList<T> GetList<T>(string connStr, string sqlStr)
 44         {
 45             using (SqlConnection conn = new SqlConnection(connStr))
 46             {
 47                 using (SqlDataAdapter sda = new SqlDataAdapter(sqlStr, conn))
 48                 {
 49                     DataSet ds = new DataSet();
 50                     sda.Fill(ds);
 51                     return DataSetToList<T>(ds, 0);
 52                 }
 53             }
 54         }
 55
 56         /// <summary>
 57         /// DataSetToList
 58         /// </summary>
 59         /// <typeparam name="T">转换类型</typeparam>
 60         /// <param name="dataSet">数据源</param>
 61         /// <param name="tableIndex">需要转换表的索引</param>
 62         /// <returns></returns>
 63         public IList<T> DataSetToList<T>(DataSet dataSet, int tableIndex)
 64         {
 65             //确认参数有效
 66             if (dataSet == null || dataSet.Tables.Count <= 0 || tableIndex < 0)
 67                 return null;
 68
 69             DataTable dt = dataSet.Tables[tableIndex];
 70
 71             IList<T> list = new List<T>();
 72
 73             for (int i = 0; i < dt.Rows.Count; i++)
 74             {
 75                 //创建泛型对象
 76                 T _t = Activator.CreateInstance<T>();
 77                 //获取对象所有属性
 78                 PropertyInfo[] propertyInfo = _t.GetType().GetProperties();
 79                 for (int j = 0; j < dt.Columns.Count; j++)
 80                 {
 81                     foreach (PropertyInfo info in propertyInfo)
 82                     {
 83                         //属性名称和列名相同时赋值
 84                         if (dt.Columns[j].ColumnName.ToUpper().Equals(info.Name.ToUpper()))
 85                         {
 86                             if (dt.Rows[i][j] != DBNull.Value)
 87                             {
 88                                 info.SetValue(_t, dt.Rows[i][j], null);
 89                             }
 90                             else
 91                             {
 92                                 info.SetValue(_t, null, null);
 93                             }
 94                             break;
 95                         }
 96                     }
 97                 }
 98                 list.Add(_t);
 99             }
100             return list;
101         }

public class UserInfo
    {
        public System.Guid ID { get; set; }

public string LoginName { get; set; }

public string LoginPwd { get; set; }
    }