App.config中的ConnectionStrings的问题

Question

 Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                ConnectionStringSettings settingConn = new ConnectionStringSettings();
                settingConn.Name = key;
                settingConn.ConnectionString = keyValue;
                config.ConnectionStrings.ConnectionStrings.Add(settingConn);
                //config.Save();
                config.Save(ConfigurationSaveMode.Modified);
 帮忙看看代码有什么问题？为什么不能添加ConnectionString

Answer 1

需要在app.config里面加 connectionstring 的value 阿。
<configuration>
  <appSettings>
   <add key="Connectionname" value="Connection Source"">
  </appSettings>
</configuration>
然后再调用其值就可以了阿

Answer 2

ConnectionStringSettings mySettings =    
new ConnectionStringSettings(newName, newConString, newProviderName);   Configuration config =    
ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);   
config.ConnectionStrings.ConnectionStrings.Add(mySettings);   
config.Save(ConfigurationSaveMode.Modified);   
ConfigurationManager.RefreshSection("ConnectionStrings");