警告"System.Configuration.ConfigurationSettings.AppSettings”已过时

在读取配置文件时

string cnnStr = System.Configuration.ConfigurationSettings.AppSettings["cnn"];

 

得出以下的警告

“System.Configuration.ConfigurationSettings.AppSettings”已过时:“"This method is obsolete, it has been replaced by System.Configuration!System.Configuration.ConfigurationManager.AppSettings。

 

直接把ConfigurationSettings写成ConfigurationManager，但是提示没有ConfigurationManager语句。

 

 

需要引用System.configuration.

Using System.Configuration;

 

最后，再把ConfigurationSettings写成ConfigurationManager。这样就OK了。