C# 读取指定路径配置文件的方法

execonfigurationfilemap map = new execonfigurationfilemap();
            map.execonfigfilename = @"f:\app1.config"; ;
            configuration config = configurationmanager.openmappedexeconfiguration(map, configurationuserlevel.none);
            string connstr = config.connectionstrings.connectionstrings["connstr"].connectionstring;
            messagebox.show(connstr);
            string key = config.appsettings.settings["key"].value;
            messagebox.show(key);