读写值in.NET .config文件 [英] Reading and writing values in.NET .config files

问题描述

我想用一个自定义路径的user.config文件，而不是让.NET从默认位置读取。

I want to use a custom path for a user.config file, rather than have .NET read it from the default location.

我打开该文件是这样的：

I am opening the file like this:

ExeConfigurationFileMap configMap = new ExeConfigurationFileMap();
configMap.ExeConfigFilename = String.Format("{0}\\user.config",AppDataPath);
Configuration config = ConfigurationManager.OpenMappedExeConfiguration(configMap, ConfigurationUserLevel.PerUserRoamingAndLocal);

但我想不出如何实际读取设置了它，我得到一个编译错误，说值是不可访问，当我试图通过应用程序数据或配置节得到的值。

But I can't figure out how to actually read settings out of it, I get a compile error saying that the values are inaccessible when I try to get a value through AppData or ConfigurationSection.

我是否需要建立某种形式的包装类的正确使用数据？

Do I need to create some sort of a wrapper class to consume the data properly?

推荐答案

我最近负责过类似的问题，我不得不改变在哪里设置文件是从AppData的默认位置的应用程序目录中读取的位置。我的解决办法是建立一个从 ApplicationSettingsBase 其中指定了自定义 SettingsProvider 。虽然该解决方案感到有点小题大做起初，我发现它是更加灵活和易于维护的，比我的预期。

I was recently tasked with a similar problem, I had to change the location of where settings files were read from the default location in AppData to the Application directory. My solution was to create my own settings files that derived from ApplicationSettingsBase which specified a custom SettingsProvider. While the solution felt like overkill at first, I've found it to be more flexible and maintainable than I had anticipated.

更新：

示例设置文件：

public class BaseSettings : ApplicationSettingsBase
{
    protected BaseSettings(string settingsKey)
       { SettingsKey = settingsKey.ToLower(); }


    public override void Upgrade()
    {
         if (!UpgradeRequired)
             return;
         base.Upgrade();
         UpgradeRequired = false;
         Save();
    }


    [SettingsProvider(typeof(MySettingsProvider)), UserScopedSetting]
    [DefaultSettingValue("True")]
    public bool UpgradeRequired
    {
         get { return (bool)this["UpgradeRequired"]; }
         set { this["UpgradeRequired"] = value; }
    }
}

样品SettingsProvider：

Sample SettingsProvider:

public sealed class MySettingsProvider : SettingsProvider
{
    public override string ApplicationName { get { return Application.ProductName; } set { } }
    public override string Name { get { return "MySettingsProvider"; } }


    public override void Initialize(string name, NameValueCollection col)
         { base.Initialize(ApplicationName, col); }


    public override void SetPropertyValues(SettingsContext context, SettingsPropertyValueCollection propertyValues)
    {
       // Use an XmlWriter to write settings to file. Iterate PropertyValueCollection and use the SerializedValue member
    }


    public override SettingsPropertyValueCollection GetPropertyValues(SettingsContext context, SettingsPropertyCollection props)
    {
       // Read values from settings file into a PropertyValuesCollection and return it
    }


    static MySettingsProvider()
    {
        appSettingsPath_ = Path.Combine(new FileInfo(Application.ExecutablePath).DirectoryName, settingsFileName_);

        settingsXml_ = new XmlDocument();
        try { settingsXml_.Load(appSettingsPath_); }
        catch (XmlException) { CreateXmlFile_(settingsXml_); } //Invalid settings file
        catch (FileNotFoundException) { CreateXmlFile_(settingsXml_); } // Missing settings file
    }
}

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