winform程序中读取config文件获得连接字符串

在App.Config文件加下两个节点中任意一个<appSettings>……</appSettings>或

<connectionStrings>……</connectionStrings>

App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <appSettings >
        <add key="constri" value ="Data Source=.;Initial Catalog=travel;Integrated Security=True"/>
    </appSettings>
    
    <connectionStrings>        
        <add name="constri" connectionString="Data Source=.;Initial Catalog=travel;Integrated Security=True"/>
        </connectionStrings>
</configuration>

然后在.cs文件中的读取连接字符串的方法为：

using System.Configuration;

1    string constr = ConfigurationSettings.AppSettings["constri"].ToString ();
2                 //string constr = System.Configuration.ConfigurationManager.ConnectionStrings["constri"].ConnectionString;

       

首先引入命名空间，第1行是如果config文件加入的是<appSettings>节点的读取方式，第二行是另一种字节的读取方法。