Web.config增删查改

Web.config  

首先要添加引用using System.Web.Configuration;

读取：

public ActionResult Get(string key)
{
string filepath = ConfigurationManager.AppSettings[key];
ViewBag.filepath = filepath;
return View();
}

添加：

public void add(string key, string value)
{
Configuration config = WebConfigurationManager.OpenWebConfiguration("~/");
AppSettingsSection app = config.AppSettings;
app.Settings.Add(key, value);
config.Save(ConfigurationSaveMode.Modified);

}

修改：

 public void Upt(string key,string value)
        {
            Configuration config = WebConfigurationManager.OpenWebConfiguration("~/");
            AppSettingsSection app = config.AppSettings;
            app.Settings[key].Value = value;
            config.Save(ConfigurationSaveMode.Modified);
        }

删除：

Public void Del(string key)
{
Configuration config = WebConfigurationManager.OpenWebConfiguration("~/");
        AppSettingsSection app = config.AppSettings;
        app.Settings.Remove(key);
        config.Save(ConfigurationSaveMode.Modified);
};