Winform添加App.config文件，和调用连接字符串的两种写法

1.App.config文件写法

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="conn" value="Data Source=.\sqlexpress;Initial Catalog=School;Integrated Security=True"/>
  </appSettings>
</configuration>

调用如下：

public static string connStr = ConfigurationManager.AppSettings["conn"].ToString();

2.App.config文件写法

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="TrackingDatabase" connectionString="Data Source=127.0.0.1;Initial Catalog=WorkflowTracking;User ID=sa;Password=123" providerName="System.Data.SqlClient" />
  </connectionStrings>
</configuration>

调用如下：

String conn = ConfigurationManager.ConnectionStrings["TrackingDatabase"].ConnectionString.ToString();