C#读取数据库返回泛型集合 把DataSet类型转换为List泛型集合

http://www.cnblogs.com/wuhuisheng/category/257549.html

/// <summary>
        /// 获取UserInfo泛型集合
        /// </summary>
        /// <param name="connStr">数据库连接字符串</param>
        /// <param name="sqlStr">要查询的T-SQL</param>
        /// <returns></returns>
        public IList<UserInfo> GetUserInfoAll(string connStr, string sqlStr)
        {
            using (SqlConnection conn = new SqlConnection(connStr))
            {
                using (SqlCommand cmd = new SqlCommand(sqlStr, conn))
                {
                    SqlDataReader sdr = cmd.ExecuteReader();

                    IList<UserInfo> list = new List<UserInfo>();

                    while (sdr.Read())
                    {

                        UserInfo userInfo = new UserInfo();

                        userInfo.ID = (Guid)sdr["ID"];

                        userInfo.LoginName = sdr["LoginName"].ToString();

                        userInfo.LoginPwd = sdr["LoginPwd"].ToString();

                        list.Add(userInfo);

                    }
                    return list;
                }
            }
        }

        /// <summary>
        /// 获取泛型集合
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="connStr">数据库连接字符串</param>
        /// <param name="sqlStr">要查询的T-SQL</param>
        /// <returns></returns>
        public IList<T> GetList<T>(string connStr, string sqlStr)
        {
            using (SqlConnection conn = new SqlConnection(connStr))
            {
                using (SqlDataAdapter sda = new SqlDataAdapter(sqlStr, conn))
                {
                    DataSet ds = new DataSet();
                    sda.Fill(ds);
                    return DataSetToList<T>(ds, 0);
                }
            }
        }

        /// <summary>
        /// DataSetToList
        /// </summary>
        /// <typeparam name="T">转换类型</typeparam>
        /// <param name="dataSet">数据源</param>
        /// <param name="tableIndex">需要转换表的索引</param>
        /// <returns></returns>
        public IList<T> DataSetToList<T>(DataSet dataSet, int tableIndex)
        {
            //确认参数有效
            if (dataSet == null || dataSet.Tables.Count <= 0 || tableIndex < 0)
                return null;

            DataTable dt = dataSet.Tables[tableIndex];

            IList<T> list = new List<T>();

            for (int i = 0; i < dt.Rows.Count; i++)
            {
                //创建泛型对象
                T _t = Activator.CreateInstance<T>();
                //获取对象所有属性
                PropertyInfo[] propertyInfo = _t.GetType().GetProperties();
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    foreach (PropertyInfo info in propertyInfo)
                    {
                        //属性名称和列名相同时赋值
                        if (dt.Columns[j].ColumnName.ToUpper().Equals(info.Name.ToUpper()))
                        {
                            if (dt.Rows[i][j] != DBNull.Value)
                            {
                                info.SetValue(_t, dt.Rows[i][j], null);
                            }
                            else
                            {
                                info.SetValue(_t, null, null);
                            }
                            break;
                        }
                    }
                }
                list.Add(_t);
            }
            return list;
        }