Question

Linqpad是唯一一个类似脚本的环境，我可以使用我的大型代码库。它是唯一适合我的环境的原因是其他解决方案（ironpython等）总是无法从app.config正确加载配置，但linqpad.config工作

问题是，我有多个配置文件，每次我想将其中一个用于脚本时，我必须转到linqpad安装目录，将正确的配置文件重命名为linqpad.config并重启linq。几乎没有生产力。

我试图通过以下方式设置文件：

AppDomain.CurrentDomain.SetData("APP_CONFIG_FILE", @"C:\Shared\app.config");

但它没有任何效果。有没有办法可以更改将在Linqpad中的C＃程序的Main（）方法中使用的配置文件？如果我可以调用一个设置要使用的配置文件的函数，然后运行我的其余代码，那就太好了。

Answer 1

Linq查询示例：

void Main()
{
    var configPath = Path.Combine(Path.GetDirectoryName(Util.CurrentQueryPath), "app.config");

    // Load custom config
    var configProxy = new ConfigurationProxy(configPath);
    if (!configProxy.InjectToConfigurationManager())
    {
        Trace.TraceError("Cannot load config from " + configPath);
        throw new InvalidOperationException("Cannot load config " + configPath);
    }

    ConfigurationManager.AppSettings["LogPath"].Dump();
}

将此类添加到Linq查询中

/// <summary>
/// A custom config injector.
/// </summary>
public sealed class ConfigurationProxy : IInternalConfigSystem
{
    /// <summary>
    /// The custom sections
    /// </summary>
    private readonly Dictionary<string, IConfigurationSectionHandler> customSections;

    /// <summary>
    /// The configuration
    /// </summary>
    private Configuration config;

    /// <summary>
    /// Initializes a new instance of the <see cref="ConfigurationProxy"/> class.
    /// </summary>
    /// <param name="fileName">
    /// Name of the file.
    /// </param>
    /// <remarks>
    /// this is called filename but really it's the path as needed
    /// it defaults to checking the directory you're running in.
    /// </remarks>
    public ConfigurationProxy(string fileName)
    {
        this.customSections = new Dictionary<string, IConfigurationSectionHandler>();

        if (!this.Load(fileName))
        {
            throw new ConfigurationErrorsException(string.Format(CultureInfo.CurrentCulture, "File: {0} could not be found or was not a valid configuration file.", this.config.FilePath));
        }
    }

    /// <summary>
    /// Gets the configuration.
    /// </summary>
    public Configuration Configuration
    {
        get
        {
            return this.config;
        }
    }

    /// <summary>
    /// Returns the configuration object based on the specified key.
    /// </summary>
    /// <param name="configKey">The configuration key value.</param>
    /// <returns>
    /// A configuration object.
    /// </returns>
    public object GetSection(string configKey)
    {
        if (configKey == "appSettings")
        {
            return this.BuildAppSettings();
        }

        object sect = this.config.GetSection(configKey);

        if (this.customSections.ContainsKey(configKey) && sect != null)
        {
            var xml = new XmlDocument();

            xml.LoadXml(((ConfigurationSection)sect).SectionInformation.GetRawXml());

            // I have no idea what I should normally be passing through in the first
            // two params, but I never use them in my config handlers so I opted not to
            // worry about it and just pass through something...
            sect = this.customSections[configKey].Create(this.config, this.config.EvaluationContext, xml.FirstChild);
        }

        return sect;
    }

    /// <summary>
    /// The refresh config.
    /// </summary>
    /// <param name="sectionName">
    /// The section name.
    /// </param>
    public void RefreshConfig(string sectionName)
    {
        // I suppose this will work. Reload the whole file?
        this.Load(this.config.FilePath);
    }

    /// <summary>
    /// Gets a value indicating whether supports user config.
    /// </summary>
    public bool SupportsUserConfig
    {
        get
        {
            return false;
        }
    }

    /// <summary>
    /// Injects to configuration manager.
    /// </summary>
    /// <returns>Whether the configuration was injected</returns>
    public bool InjectToConfigurationManager()
    {
        // inject self into ConfigurationManager
        var configSystem = typeof(ConfigurationManager).GetField("s_configSystem", BindingFlags.Static | BindingFlags.NonPublic);
        if (configSystem != null)
        {
            configSystem.SetValue(null, this);
        }

        // lame check, but it's something
        if (ConfigurationManager.AppSettings.Count == this.config.AppSettings.Settings.Count)
        {
            return true;
        }

        return false;
    }

    /// <summary>
    /// Loads the specified file.
    /// </summary>
    /// <param name="file">
    /// The file.
    /// </param>
    /// <returns>
    /// Is file loaded
    /// </returns>
    private bool Load(string file)
    {
        var map = new ExeConfigurationFileMap { ExeConfigFilename = file };
        this.config = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);

        var xml = new XmlDocument();
        using (var stream = new FileStream(file, FileMode.Open, FileAccess.Read))
        {
            xml.Load(stream);
        }

        // var cfgSections = xml.GetElementsByTagName("configSections");

        // if (cfgSections.Count > 0)
        // {
        // foreach (XmlNode node in cfgSections[0].ChildNodes)
        // {
        // var type = System.Activator.CreateInstance(
        // Type.GetType(node.Attributes["type"].Value))
        // as IConfigurationSectionHandler;

        // if (type == null) continue;

        // customSections.Add(node.Attributes["name"].Value, type);
        // }
        // }
        return this.config.HasFile;
    }

    /// <summary>
    /// The build app settings.
    /// </summary>
    /// <returns>
    /// The <see cref="NameValueCollection"/>.
    /// </returns>
    private NameValueCollection BuildAppSettings()
    {
        var coll = new NameValueCollection();

        foreach (var key in this.config.AppSettings.Settings.AllKeys)
        {
            coll.Add(key, this.config.AppSettings.Settings[key].Value);
        }

        return coll;
    }
}

我可以以编程方式分配要使用的linqpad配置文件吗？

1 个答案: