ASP.NET系列：自定义配置节点的复用

2019-11-14 14:32:56

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appSettings太简单，为每个程序自定义配置节点太复杂，因此要解决app.config&web.config自定义配置的复用问题。

1.读取不依赖SectionName,根节点可以定义为任何名称。

2.足够简单，配置项采用name value的形式；足够复杂，采用树型结构，每个节点都可以有多个配置项和子节点。

3.使用简单，采用路径简化配置项的读取。如: config.Get<string>("root.sub.item-test")。

一、调用方式：

1.配置文件：

<?xml version="1.0" encoding="utf-8" ?><configuration>  <configSections>    <section name="node" type="Onion.Configuration.AppConfig.ConfigSection,Onion.Configuration" />  </configSections>  <node name="root">    <items>      <item name="version" value="1.0.0.1" />    </items>    <nodes>      <node name="runtime">        <items>          <item name="debug" value="false" />          <item name="ioc" value="IoC.Contianer.StructureMapIoC" />        </items>      </node>      <node name="upload">        <items>          <item name="auth" value="true" />          <item name="path" value="~/upload" />          <item name="url" value="~/Upload/Index" />        </items>      </node>      <node name="captcha">        <items>          <item name="timeout" value="3000" />          <item name="url" value="~/Captcha/Index" />        </items>      </node>      <node name="oauth2">        <items>          <item name="disabled" value ="false" />          <item name="callback" value ="/Home/ExternalLoginCallBack?PRoviderName=" />        </items>        <nodes>          <node name="QQclient">            <items>              <item name="disabled" value="false" />              <item name="method" value="get" />              <item name="key" value="9233e24d" />              <item name="secret" value="1ac35907-7cfa-4079-975c-959b98d23a95" />            </items>          </node>          <node name="weiboclient">            <items>              <item name="disabled" value="true" />              <item name="method" value="post" />              <item name="key" value="0cdea8f3" />              <item name="secret" value="dc679dbb-7e75-44f7-a99e-5359259fc94b" />            </items>          </node>        </nodes>      </node>    </nodes>  </node></configuration>

2.调用代码：

[Fact]        public void Tests()        {            var config = new AppConfigAdapter();            Assert.True(config.Get<string>("version") == "1.0.0.1");            Assert.True(config.Get<bool>("runtime.debug") == false);            Assert.True(config.Get<string>("runtime.ioc") == "IoC.Contianer.StructureMapIoC");            Assert.True(config.Get<bool>("upload.auth") == true);            Assert.True(config.Get<string>("upload.path") == "~/upload");            Assert.True(config.Get<string>("upload.url") == "~/Upload/Index");            Assert.True(config.Get<int>("captcha.timeout") == 3000);            Assert.True(config.Get<string>("captcha.url") == "~/Captcha/Index");            Assert.True(config.Get<bool>("oauth2.disabled") == false);            Assert.True(config.Get<string>("oauth2.callback") == "/Home/ExternalLoginCallBack?ProviderName=");            Assert.True(config.GetNode("oauth2").Nodes.Any(o => o.GetItem<bool>("disabled")));            foreach (var node in config.GetNode("oauth2").Nodes)            {                if (node.Name == "qqclient")                {                    Assert.True(node.GetItem<bool>("disabled") == false);                    Assert.True(node.GetItem<string>("method") == "get");                    Assert.True(node.GetItem<string>("key") == "9233e24d");                    Assert.True(node.GetItem<string>("secret") == "1ac35907-7cfa-4079-975c-959b98d23a95");                }                else if (node.Name == "weiboclient")                {                    Assert.True(node.GetItem<bool>("disabled") == true);                    Assert.True(node.GetItem<string>("method") == "post");                    Assert.True(node.GetItem<string>("key") == "0cdea8f3");                    Assert.True(node.GetItem<string>("secret") == "dc679dbb-7e75-44f7-a99e-5359259fc94b");                }            }        }

二、接口定义：

1.配置项定义：IItem接口定义最基础的配置项，只包含Name和Value属性。

public interface IItem{    string Name { get; set; }     string Value { get; set; }}

2.配置节点定义：INode接口定义了配置节点的树形结构

public interface INode{    string Name { get; set; }     IEnumerable<IItem> Items { get; set; }     IEnumerable<INode> Nodes { get; set; }     string GetItem(string itemName);     T GetItem<T>(string itemName);}

3.读取接口定义：IConfig接口定义了配置节点和配置项的读取

public interface IConfig{    INode GetNode(string nodeName);     string Get(string nameOrPath);     T Get<T>(string nameOrPath);}

以上3个接口定义了所有的逻辑。

三、接口实现：

1.自定义ItemElement（IItem）和ItemElementCollection用于实现单个节点的配置项读取。

    public class ItemElement : ConfigurationElement, IItem    {        [ConfigurationProperty("name", IsRequired = true)]        public string Name        {            get { return Convert.ToString(this["name"]); }            set { this["name"] = value; }        }        [ConfigurationProperty("value", IsRequired = true)]        public string Value        {            get { return Convert.ToString(this["value"]); }            set { this["value"] = value; }        }    }    public class ItemElementCollection : ConfigurationElementCollection, IEnumerable<IItem>    {        protected override ConfigurationElement CreateNewElement()        {            return new ItemElement();        }        protected override object GetElementKey(ConfigurationElement element)        {            return ((ItemElement)element).Name;        }        public new IEnumerator<IItem> GetEnumerator()        {            for (int i = 0; i < base.Count; i++)            {                yield return base.BaseGet(i) as IItem;            }        }    }

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2.自定义NodeElement（INode）和NodeElementCollection用于实现节点树功能。

    public class NodeElement : ConfigurationElement, INode    {        [ConfigurationProperty("name", IsRequired = true)]        public string Name        {            get { return Convert.ToString(this["name"]); }            set { this["name"] = value; }        }        [ConfigurationProperty("items")]        [ConfigurationCollection(typeof(ItemElementCollection), AddItemName = "item")]        public ItemElementCollection ItemElements        {            get            {                return this["items"] as ItemElementCollection;            }            set { this["items"] = value; }        }        [ConfigurationProperty("nodes")]        [ConfigurationCollection(typeof(NodeElementCollection), AddItemName = "node")]        public NodeElementCollection NodeElements        {            get            {                return this["nodes"] as NodeElementCollection;            }            set { this["nodes"] = value; }        }        public IEnumerable<IItem> Items        {            get            {                return this["items"] as ItemElementCollection;            }            set { this["items"] = value; }        }        public IEnumerable<INode> Nodes        {            get            {                return this["nodes"] as NodeElementCollection;            }            set { this["nodes"] = value; }        }        public string GetItem(string itemName)        {            return this.Items.FirstOrDefault(o => o.Name == itemName)?.Value;        }        public T GetItem<T>(string itemName)        {            return (T)Convert.ChangeType(this.GetItem(itemName), typeof(T));        }    }    public class NodeElementCollection : ConfigurationElementCollection, IEnumerable<INode>    {        protected override ConfigurationElement CreateNewElement()        {            return new NodeElement();        }        protected override object GetElementKey(ConfigurationElement element)        {            return ((NodeElement)element).Name;        }        public new IEnumerator<INode> GetEnumerator()        {            for (int i = 0; i < base.Count; i++)            {                yield return base.BaseGet(i) as INode;            }        }    }

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3.自定义ConfigSection实现配置节点和配置项读取。

    public class ConfigSection : ConfigurationSection, INode    {        [ConfigurationProperty("name", IsRequired = true)]        public string Name        {            get { return Convert.ToString(this["name"]); }            set { this["name"] = value; }        }        [ConfigurationProperty("items")]        [ConfigurationCollection(typeof(ItemElementCollection), AddItemName = "item")]        public ItemElementCollection ItemElements        {            get            {                return this["items"] as ItemElementCollection;            }            set { this["items"] = value; }        }        [ConfigurationProperty("nodes")]        [ConfigurationCollection(typeof(NodeElementCollection), AddItemName = "node")]        public NodeElementCollection NodeElements        {            get            {                return (NodeElementCollection)this["nodes"];            }            set { this["nodes"] = value; }        }        public IEnumerable<IItem> Items        {            get            {                return this["items"] as ItemElementCollection;            }            set { this["items"] = value; }        }        public IEnumerable<INode> Nodes        {            get            {                return (NodeElementCollection)this["nodes"];            }            set { this["nodes"] = value; }        }        public string GetItem(string itemName)        {            return this.Items.FirstOrDefault(o => o.Name == itemName)?.Value;        }        public T GetItem<T>(string itemName)        {            return (T)Convert.ChangeType(this.GetItem(itemName), typeof(T));        }    }

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4.自定义AppConfigAdapter实现IConfig接口。

    public class AppConfigAdapter : IConfig    {        private INode _section;        public AppConfigAdapter()        {            var sectionName = (HostingEnvironment.IsHosted ? WebConfigurationManager.OpenWebConfiguration("~") : ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None))                .Sections.Cast<ConfigurationSection>()                .FirstOrDefault(o => o.SectionInformation.Type.IndexOf("Onion.Configuration.AppConfig.ConfigSection") != -1)                .SectionInformation.Name ?? "Node";            _section = (INode)ConfigurationManager.GetSection(sectionName);        }        public INode GetNode(string nodeName)        {            return this.GetNode(nodeName, this._section);        }        public string Get(string nameOrPath)        {            if (nameOrPath.IndexOf('.') == -1)            {                return this._section.Items.FirstOrDefault(o => o.Name == nameOrPath)?.Value;            }            var nodeItemPath = nameOrPath.Split('.');            var node = this.GetNode(nodeItemPath.FirstOrDefault());            var nodeNameList = nodeItemPath.Skip(1).Take(nodeItemPath.Length - 2);            if (node != null)            {                foreach (var item in nodeNameList)                {                    if (node.Nodes.Any(o => o.Name == item))                    {                        node = node.Nodes.FirstOrDefault(o => o.Name == item);                    }                    else                    {                        throw new System.ArgumentException(string.Format("node name {0} error", item));                    }                }                return node.Items.FirstOrDefault(o => o.Name == nodeItemPath.LastOrDefault()).Value;            }            return null;        }        public T Get<T>(string nameOrPath)        {            var value = this.Get(nameOrPath);            return (T)Convert.ChangeType(value, typeof(T));        }        #region private        private INode GetNode(string nodeName, INode node)        {            INode result = null;            if (node.Name == nodeName)            {                return node;            }            else if (node.Nodes.Any())            {                foreach (var item in node.Nodes)                {                    result = GetNode(nodeName, item);                    if (result != null)                    {                        break;                    }                }            }            return result;        }        #endregion private    }