IConfigurationSectionHandler 使用~

读取webconfig中自定义的xml  处理对特定的配置节的访问。

webconfig

  <configSections>
    <section name="NopConfig" type="BotanicSystem.Core.Configuration.NopConfig, BotanicSystem.Core" requirePermission="false" />
  </configSections>

  <NopConfig>
    <!-- Web farm support
    Enable "MultipleInstancesEnabled" if you run multiple instances.
    Enable "RunOnAzureWebsites" if you run on Windows Azure Web sites (not cloud services). -->
    <WebFarms MultipleInstancesEnabled="False" RunOnAzureWebsites="False" />
    <!-- Windows Azure BLOB storage. Specify your connection string, container name, end point for BLOB storage here -->
    <AzureBlobStorage ConnectionString="" ContainerName="" EndPoint="" />
    <!-- Redis support (used by web farms, Azure, etc). Find more about it at https://azure.microsoft.com/en-us/documentation/articles/cache-dotnet-how-to-use-azure-redis-cache/ -->
    <RedisCaching Enabled="false" ConnectionString="localhost" />
    <!-- You can get the latest version of user agent strings at http://browscap.org/ -->
    <UserAgentStrings databasePath="~/App_Data/browscap.xml" />
    <!-- Set the setting below to "False" if you did not upgrade from one of the previous versions. It can slightly improve performance -->
    <SupportPreviousNopcommerceVersions Enabled="True" />
    <!-- Do not edit this element. For advanced users only -->
    <Installation DisableSampleDataDuringInstallation="False" UseFastInstallationService="False" PluginsIgnoredDuringInstallation="" />
  </NopConfig>

解析读取

    /// <summary>
    /// Represents a NopConfig
    /// </summary>
    public partial class NopConfig : IConfigurationSectionHandler
    {
        /// <summary>
        /// Creates a configuration section handler.
        /// </summary>
        /// <param name="parent">Parent object.</param>
        /// <param name="configContext">Configuration context object.</param>
        /// <param name="section">Section XML node.</param>
        /// <returns>The created section handler object.</returns>
        public object Create(object parent, object configContext, XmlNode section)
        {
            var config = new NopConfig();

            var startupNode = section.SelectSingleNode("Startup");
            config.IgnoreStartupTasks = GetBool(startupNode, "IgnoreStartupTasks");
           
            var redisCachingNode = section.SelectSingleNode("RedisCaching");
            config.RedisCachingEnabled = GetBool(redisCachingNode, "Enabled");
            config.RedisCachingConnectionString = GetString(redisCachingNode, "ConnectionString");

            var userAgentStringsNode = section.SelectSingleNode("UserAgentStrings");
            config.UserAgentStringsPath = GetString(userAgentStringsNode, "databasePath");
           
            var supportPreviousNopcommerceVersionsNode = section.SelectSingleNode("SupportPreviousNopcommerceVersions");
            config.SupportPreviousNopcommerceVersions = GetBool(supportPreviousNopcommerceVersionsNode, "Enabled");
            
            var webFarmsNode = section.SelectSingleNode("WebFarms");
            config.MultipleInstancesEnabled = GetBool(webFarmsNode, "MultipleInstancesEnabled");
            config.RunOnAzureWebsites = GetBool(webFarmsNode, "RunOnAzureWebsites");

            var azureBlobStorageNode = section.SelectSingleNode("AzureBlobStorage");
            config.AzureBlobStorageConnectionString = GetString(azureBlobStorageNode, "ConnectionString");
            config.AzureBlobStorageContainerName = GetString(azureBlobStorageNode, "ContainerName");
            config.AzureBlobStorageEndPoint = GetString(azureBlobStorageNode, "EndPoint");

            var installationNode = section.SelectSingleNode("Installation");
            config.DisableSampleDataDuringInstallation = GetBool(installationNode, "DisableSampleDataDuringInstallation");
            config.UseFastInstallationService = GetBool(installationNode, "UseFastInstallationService");
            config.PluginsIgnoredDuringInstallation = GetString(installationNode, "PluginsIgnoredDuringInstallation");

            return config;
        }

        private string GetString(XmlNode node, string attrName)
        {
            return SetByXElement<string>(node, attrName, Convert.ToString);
        }

        private bool GetBool(XmlNode node, string attrName)
        {
            return SetByXElement<bool>(node, attrName, Convert.ToBoolean);
        }

        private T SetByXElement<T>(XmlNode node, string attrName, Func<string, T> converter)
        {
            if (node == null || node.Attributes == null) return default(T);
            var attr = node.Attributes[attrName];
            if (attr == null) return default(T);
            var attrVal = attr.Value;
            return converter(attrVal);
        }

        /// <summary>
        /// Indicates whether we should ignore startup tasks
        /// </summary>
        public bool IgnoreStartupTasks { get; private set; }

        /// <summary>
        /// Path to database with user agent strings
        /// </summary>
        public string UserAgentStringsPath { get; private set; }



        /// <summary>
        /// Indicates whether we should use Redis server for caching (instead of default in-memory caching)
        /// </summary>
        public bool RedisCachingEnabled { get; private set; }
        /// <summary>
        /// Redis connection string. Used when Redis caching is enabled
        /// </summary>
        public string RedisCachingConnectionString { get; private set; }



        /// <summary>
        /// Indicates whether we should support previous nopCommerce versions (it can slightly improve performance)
        /// </summary>
        public bool SupportPreviousNopcommerceVersions { get; private set; }



        /// <summary>
        /// A value indicating whether the site is run on multiple instances (e.g. web farm, Windows Azure with multiple instances, etc).
        /// Do not enable it if you run on Azure but use one instance only
        /// </summary>
        public bool MultipleInstancesEnabled { get; private set; }

        /// <summary>
        /// A value indicating whether the site is run on Windows Azure Websites
        /// </summary>
        public bool RunOnAzureWebsites { get; private set; }

        /// <summary>
        /// Connection string for Azure BLOB storage
        /// </summary>
        public string AzureBlobStorageConnectionString { get; private set; }
        /// <summary>
        /// Container name for Azure BLOB storage
        /// </summary>
        public string AzureBlobStorageContainerName { get; private set; }
        /// <summary>
        /// End point for Azure BLOB storage
        /// </summary>
        public string AzureBlobStorageEndPoint { get; private set; }


        /// <summary>
        /// A value indicating whether a store owner can install sample data during installation
        /// </summary>
        public bool DisableSampleDataDuringInstallation { get; private set; }
        /// <summary>
        /// By default this setting should always be set to "False" (only for advanced users)
        /// </summary>
        public bool UseFastInstallationService { get; private set; }
        /// <summary>
        /// A list of plugins ignored during nopCommerce installation
        /// </summary>
        public string PluginsIgnoredDuringInstallation { get; private set; }
    }

使用

var config = ConfigurationManager.GetSection("NopConfig") as NopConfig;

IConfigurationSectionHandler  是 在System.Configuration 下