Specific methods to modify web.config nodes in asp.net code

But this variable will not have a fixed value and will change according to the actual situation. For example, when you need to read the path of a configuration file, and this path is the actual hard disk path published by the site, if it is directly the compile-time state, no problem. But if the site iis changes the path, you need to modify the parameters in this web.config. If this compile-time state can be modified into a run-time state, it will be more reasonable and convenient. This requires a solution that can dynamically modify web.config in code.
Code

 /// <summary>
          /// 写入web.config
          /// </summary>
          /// <param name="item">appSettings等</param>
          /// <param name="key">键</param>
          /// <param name="value">值</param>
          public void WriteConfig(string item, string key, string value)
          {
              if (item == "")
             {
                 item = "appSettings";
             }
             Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(System.Web.HttpContext.Current.Request.ApplicationPath);
             AppSettingsSection appSection = (AppSettingsSection)config.GetSection(item);
             if (appSection.Settings[key] == null)
             {
                 appSection.Settings.Add(key, value);
                 config.Save();
             }
             else
             {
                 appSection.Settings.Remove(key);
                 appSection.Settings.Add(key, value);
                 config.Save();
            }
         }

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