C# 读取 appconfig文件配置数据库连接字符串，和配置文件

1、首先先在工程里添加system.configuration.dll程序集的引用


<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="TQ电力.Properties.Settings.wx2010ConnectionString" connectionString="Data Source=*****;Initial Catalog=wx2010;Persist Security Info=True;User ID=sa;Password=******"
            providerName="System.Data.SqlClient" />
    </connectionStrings>
    <appSettings>
       <add key="ConnectionString" value="server=127.0.0.1;user id=sa; password=csw; database=testDB;"/>
       <add key="ConStringEncrypt" value="true"/>
    </appSettings>
</configuration>

//访问数据库连接字符串
string connStr1 = System.Configuration.ConfigurationManager.ConnectionStrings["TQ电力.Properties.Settings.wx2010ConnectionString"].ToString();
//访问元应用程序配置
string connStr2 = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"].ToString();

MessageBox.Show(connStr1);
MessageBox.Show(connStr2);