常见.NET功能代码汇总

long appId = 123;

 //修改网站的配置文件
 var configFile = new FileInfo(configFilePath);
 var vdm = new VirtualDirectoryMapping(configFile.DirectoryName, true, configFile.Name);
 var wcfm = new WebConfigurationFileMap();
 wcfm.VirtualDirectories.Add("/", vdm);
 var config = WebConfigurationManager.OpenMappedWebConfiguration(wcfm, "/", siteName);
 AppSettingsSection appSection = (AppSettingsSection)config.GetSection("appSettings");
 appSection.Settings["abc"].Value = "system tag";
 appSection.Settings["appId"].Value = appId.ToString();
 config.Save();