asp.net笔记.1

如何将数据以字符串形式输出。

首先连接数据库，vwd的项目中添加web配置文件.config为后缀。

View Code

<?xml version="1.0"?>
<configuration>
  <connectionStrings>
    <add name="ConnectionString" connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|\login.mdf;Integrated Security=True;User Instance=True"/>
  </connectionStrings>
  <system.web>
    <compilation debug="true" targetFramework="4.0"/>
  </system.web>
</configuration>

在<configuration>中添加<connectionStrings>内容，如代码所提示。

然后在建立一个asp，代码如下

View Code

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 using System.Data.SqlClient;
 8 using System.Configuration;
 9 
10 public partial class connection : System.Web.UI.Page
11 {
12     protected void Page_Load(object sender, EventArgs e)
13     {
14         string sqlconnstr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
15         SqlConnection sqlconn = new SqlConnection(sqlconnstr);
16         SqlCommand sqlcommand = new SqlCommand();
17         sqlcommand.Connection = sqlconn;
18         sqlconn.Open();
19         Label1.Text = "数据库已连接上";
20         sqlcommand.CommandText = "select* from login_table";
21         SqlDataReader sqldatareader = sqlcommand.ExecuteReader();
22         Label2.Text = "";
23         while (sqldatareader.Read())
24         {
25             Label2.Text += sqldatareader.GetInt32(0) + "";
26             Label2.Text += sqldatareader.GetString(1) + "";
27             Label2.Text += sqldatareader.GetString(2) + "  <br>";
28         }
29         sqlcommand = null;
30         sqlconn.Close();
31         Label3.Text = "数据库已关闭";
32         sqlconn = null;
33 
34     }
35 }