web.config中配置数据库

 

在web.config文件:加在</configSections>后面

<connectionStrings>
<add name="SqlConnection" connectionString="Data Source=MING-THINK\SQLEXPRESS;database=ming;uid=sa;pwd=sasasa" providerName="System.Data.SqlClient"/>
</connectionStrings>

注：可能会出现connectionStrings错误是因为Framework版本不正确导致的。修改版本即可

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;  //ConfigurationManager的名称空间
using System.Text;  //StringBuilder的名称空间

public partial class Default1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string name = "SqlConnection";
        string connectionString = ConfigurationManager.ConnectionStrings["SqlConnection"].ConnectionString;//中括号中的内容为web.config中的name
        string providerName = ConfigurationManager.ConnectionStrings["SqlConnection"].ProviderName;
        StringBuilder builder = new StringBuilder(string.Empty);
        builder.AppendFormat("<b>连接字符串键名：{0}</b><br/>",name);
        builder.AppendFormat("<b>数据库连接字符串：{0}</b><br/>", connectionString);
        builder.AppendFormat("<b>数据提供程序名称：{0}</b><br/>", providerName);
        this.Response.Write(builder.ToString());

    }
}

 

使用connectionStrings配置节点配置连接字符串后，任何连接字符串头可以通过ConfigurationManager静态类ConnectionStrings静态属性获取。
web.config:

 

name:连接字符串的键名

providerName：System.Data.SqlClient为sqlserver数据库。Mysql.Data.MysqlClient使用Mysql数据库

connectionString：配置的连接字符串