修改自定义app.config配置节并保存

问题描述

我正在使用.NET Framework 4.6.1开发C＃WPF MVVM应用程序，并且在App.config中有一个自定义部分：

I'm developing a C# WPF MVVM application with .NET Framework 4.6.1 and I have a custom section in App.config:

<configuration>
    <configSections>
        <section name="SpeedSection" type="System.Configuration.NameValueSectionHandler" />
    </configSections>
    <SpeedSection>
        <add key="PrinterSpeed" value="150" />
        <add key="CameraSpeed" value="150" />
    </SpeedSection>
</configuration>

我想修改 PrinterSpeed 和 CameraSpeed 从我的应用中。我试过了这段代码：

I want to modify PrinterSpeed and CameraSpeed from my app. I have tried this code:

static void AddUpdateAppSettings(string key, string value)
{
    try
    {
        var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        var settings = configFile.AppSettings.Settings;
        if (settings[key] == null)
        {
            settings.Add(key, value);
        }
        else
        {
            settings[key].Value = value;
        }
        configFile.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
    }
    catch (ConfigurationErrorsException)
    {
        Console.WriteLine("Error writing app settings");
    }
}

但这不起作用，因为我不是修改 AppSettings 部分。

But it doesn't work because I'm not modifying AppSettings section.

如何修改这些值？

推荐答案

System.Configuration.NameValueSectionHandler 很难使用。您可以使用 System.Configuration.AppSettingsSection 替换它，而无需进行其他操作：

System.Configuration.NameValueSectionHandler is hard to work with. You can replace it with System.Configuration.AppSettingsSection without touching anything else:

<configuration>
    <configSections>
        <section name="SpeedSection" type="System.Configuration.AppSettingsSection" />
    </configSections>
    <SpeedSection>
        <add key="PrinterSpeed" value="150" />
        <add key="CameraSpeed" value="150" />
    </SpeedSection>
</configuration>

然后按如下所示更改您的方法：

And then change your method as follows:

static void AddUpdateAppSettings(string key, string value)
{
    try
    {
        var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        var settings = ((AppSettingsSection) configFile.GetSection("SpeedSection")).Settings;
        if (settings[key] == null)
        {
            settings.Add(key, value);
        }
        else
        {
            settings[key].Value = value;
        }
        configFile.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
    }
    catch (ConfigurationErrorsException)
    {
        Console.WriteLine("Error writing app settings");
    }
}

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