将结果集从OleDbDataReader转换为列表

考虑连接到SQL Server 2008数据库并运行SQL SELECT语句的Winforms应用程序：

 string myConnectionString = "Provider=SQLOLEDB;Data Source=hermes;Initial Catalog=qcvaluestest;Integrated Security=SSPI;"; string mySelectQuery = "SELECT top 500 name, finalconc from qvalues where rowid between 0 and 25000;"; OleDbConnection myConnection = new OleDbConnection(myConnectionString); OleDbCommand myCommand = new OleDbCommand(mySelectQuery, myConnection); myCommand.Connection.Open(); OleDbDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection); 

如何将查询结果读入列表？

Answer 1

假设您已经定义了类似的类

 class MyData { public string Name {get; set;} public int FinalConc {get; set;} // or whatever the type should be } 

您将迭代查询结果以加载列表。

 List list = new List(); while (myReader.Read()) { MyData data = new MyData(); data.Name = (string)myReader["name"]; data.FinalConc = (int)myReader["finalconc"]; // or whatever the type should be list.Add(data); } // work with the list 

如果您只需要一个给定的字段，则可以放弃类定义，只需要一个List ，其中T是您要保留的任何字段的类型。

Answer 2

您可以尝试一下（为方便起见，进行调整）：

 public class Person { public string Name { get; set; } public int Age { get; set; } } List dbItems = new List(); while(myReader.Read()) { Person objPerson = new Person(); objPerson.Name = Convert.ToString(myReader["Name"]); objPerson.Age = Convert.ToInt32(myReader["Age"]); dbItems.Add(objPerson); } 

Answer 3

清单是什么？ 你有一个具有name和finalconc属性的类设置吗？ 说你做，看起来像这样：

 public class QueryResult { public string Name { get; set; } //not sure what finalconc type would be, so here just using string public string FinalConc { get; set; } } 

然后你会做这样的事情：

 var queryResults = new List(); using(var myReader = myCommand.ExecuteReader()) { while(myReader.Read()) { queryResults.Add(new QueryResult { Name = myReader.GetString(myReader.GetOrdinal("name")), FinalConc = myReader.GetString(myReader.GetOrdinal("finalconc")) }); } }