用C#读SQL SERVER到控制台的简单示例

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data.SqlClient;namespace ConsoleApplication4{ class Program { static void Main(string[] args) { //sqlserver身份验证 //string sqlconn = "server=(local);database=keede1228;user id=sa;password=123;"; //windows身份验证 string sqlconn = "server=(local);database=keede1228;integrated security=SSPI;"; string select = "select * from dbo.lmShop_City"; SqlConnection conn = new SqlConnection(sqlconn); Console.WriteLine("33"); conn.Open(); Console.WriteLine("11"); SqlCommand cmd = new SqlCommand(select, conn); SqlDataReader reader = cmd.ExecuteReader(); while (reader.Read()) { Console.WriteLine("cityid:{0} city:{1} area:{2}", reader[0], reader[1], reader[2]); } conn.Close(); Console.WriteLine("22"); Console.ReadKey(); } }}

 

有一点疑问：最后输出到控制台的时候，如果不加"cityid:{0} city:{1} area:{2}"就会报错，不知道是为什么，好像是类型转换的事，有明白的帮我解答一下，谢谢。