更新资料 <appSettings> 在App.config winForm C＃中

Question

I write class when the program run, it check Connection to SQL Server. if the connection is not Ok, the new form Show up and ask for ServerName, DBName, UserName, and Password , then check the connection again if it is Ok it enter the program

I write Code if new information For connection Ok It save in App.Config But It doesn't Work

public static void SaveToConfig(string key,string value)
    {
        Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        config.AppSettings.Settings[key].Value = value;
        config.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection("appSettings");

    }

Answer 1

Try this,

First, include using a statement like :

1 using System.Configuration;

2 Edit App.config so that you add your settings in the appSetting.config file and add an element with key and value parameters eg

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>

    <appSettings>
      <add key="server" value="localhost" />
      <add key="port" value="5432" />
      <add key="username" value="myusername" />
      <add key="password" value="mypass" />
      <add key="database" value="mydb" />
    </appSettings>
</configuration>

Now you can access your settings in your given code.