在外部文件中编写appSettings

Question

我有一个配置文件app.exe.config和appSettings部分有这样的:

<configuration>
    <appSettings configSource="app.file.config" />
</configuration>

app.file.config文件有这样的东西:

<?xml version="1.0" encoding="utf-8" ?>
<appSettings>
  <add key="var1" value="value 1" />
  <add key="var2" value="value 2" />
  <add key="var3" value="value 3" />
</appSettings>

我需要在运行时编辑var1,var2和var3,我有这样的代码:

Configuration config = ConfigurationManager.OpenExeConfiguration("...path\app.exe);

config.AppSettings.SectionInformation.ConfigSource = "app.file.config";

config.AppSettings.Settings["var1"].Value = "value 11";
config.AppSettings.Settings["var2"].Value = "value 22";
config.AppSettings.Settings["var3"].Value = "value 33";
config.Save(ConfigurationSaveMode.Modified);

ConfigurationManager.RefreshSection("appSettings");

当我运行config.Save ....文件app.file.config有一个appSettings节点,其属性为"file".此属性具有app.file.config的值

<appSettings file="app.file.config">
<add key="var1" value="value 1" />
  <add key="var2" value="value 2" />
  <add key="var3" value="value 3" />
</appSettings>

现在,如果我尝试加载配置文件,我有一个例外,消息"无法识别的属性'文件'.请注意,属性名称区分大小写." 在app.file.config中.

如果手动删除文件属性,则会正确加载配置文件.

有任何想法吗？

保存配置文件时如何避免写入文件属性.

谢谢

Answer 1

使用外部配置文件对于应用程序是透明的,

这部分还可以

</configuration>
    <appSettings configSource="app.file.config" />
</configuration>

还有这个:

<?xml version="1.0" encoding="utf-8" ?>

<appSettings>
  <add key="var1" value="value 1" />
  <add key="var2" value="value 2" />
  <add key="var3" value="value 3" />
</appSettings>

将代码更改为:

Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
config.AppSettings.Settings["var1"].Value = "value 11";
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");

引用外部配置文件对应用程序是透明的,因此您不必直接调用它.您可以使用配置管理器中的默认appSetting部分.

祝好运

Answer 2

一个更完整的答案，以防止混淆：

设置：

1. 名为“app”的命令行项目

2. app.exe.config 文件，App.config：

   <appSettings file="App.Settings.config"></appSettings>
   

3. 带有“复制到输出目录”=“始终复制”的 App.Settings.config 文件

   <?xml version="1.0" encoding="utf-8"?>
   <appSettings>
     <add key="test" value="OVERRIDDEN"/>
   </appSettings>
   

4. 程序.cs：

   static void Main(string[] args)
   {
       try
       {
           Console.WriteLine("Local Config sections");
           var exepath = (new Uri(System.Reflection.Assembly.GetExecutingAssembly().CodeBase)).LocalPath;
           Configuration config = ConfigurationManager.OpenExeConfiguration(exepath);
   
           config.AppSettings.SectionInformation.ConfigSource = "App.Settings.config";
   
           Console.WriteLine("BEFORE[test]=" + config.AppSettings.Settings["test"].Value);
           Console.WriteLine($"BEFORE[testExternalOnly]={config.AppSettings.Settings["testExternalOnly"]?.Value}");
   
           //to avoid: Error CS0266
           //Explicitly cast 'System.Configuration.AppSettingsSection'
           AppSettingsSection myAppSettings = (AppSettingsSection)config.GetSection("appSettings");
   
           myAppSettings.Settings["test"].Value = "NEW";
           if (!myAppSettings.Settings.AllKeys.Contains("testExternalOnly"))
               myAppSettings.Settings.Add("testExternalOnly", "NEWEXTERNAL");
   
           config.Save(ConfigurationSaveMode.Modified);
           ConfigurationManager.RefreshSection("appSettings");
   
           //Read updated config
           Console.WriteLine("AFTER[test]=" + config.AppSettings.Settings["test"].Value);
           Console.WriteLine("AFTER[testExternalOnly]=" + config.AppSettings.Settings["testExternalOnly"].Value);
   
           Console.WriteLine("AFTER CONFIG EXTERNAL FILE: " + System.IO.File.ReadAllText("App.Settings.config"));
   
           Console.WriteLine("AFTER CONFIG FILE: " + System.IO.File.ReadAllText(System.AppDomain.CurrentDomain.FriendlyName + ".config"));
   
   
           //Shut current config
           config = null;
   
           //Open config
           config = ConfigurationManager.OpenExeConfiguration(exepath);
           config.AppSettings.SectionInformation.ConfigSource = "App.Settings.config";
   
           Console.WriteLine("AFTER[test]=" + config.AppSettings.Settings["test"].Value);
           Console.WriteLine("AFTER[testExternalOnly]=" + config.AppSettings.Settings["testExternalOnly"].Value);
   
           Console.WriteLine("AFTER CONFIG EXTERNAL FILE: " + System.IO.File.ReadAllText("App.Settings.config"));
   
           Console.WriteLine("AFTER CONFIG FILE: " + System.IO.File.ReadAllText(System.AppDomain.CurrentDomain.FriendlyName + ".config"));
       }
       catch (Exception ex)
       {
           Console.WriteLine(ex.Message);
       }
       Console.WriteLine("press the ENTER key to end");
       Console.ReadLine();
   
   }
   

这将导致 App.Settings.config 文件更新到文件系统上，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<appSettings>
  <add key="test" value="NEW" />
  <add key="testExternalOnly" value="NEWEXTERNAL" />
</appSettings>

Answer 3

将配置文件声明如下：

<appSettings configSource="app.file.config">
<add key="var1" value="value 1" />
  <add key="var2" value="value 2" />
  <add key="var3" value="value 3" />
</appSettings>

并从代码中

Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
AppSettingsSection myAppSettings = config.GetSection("appSettings")
myAppSettings.Settings["var1"].Value = "value 11";
config.Save(ConfigurationSaveMode.Modified);

请注意，我使用 GetSection("appSettings") 而不是 config.AppSettings.Settings

感谢 StackOverflow 中所有帮助人们的人。