.Net App.Config 读取

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经常能在.Net 项目中看到App.Config/Web.Config , 一直没有了解过.Net 自带的对配置文件的读写操作，常规的操作类在 System.Configuration.dll 中，比较重要的类为ConfigurationManager

底部有全部代码+单元测试

	`<?xml version="1.0" encoding="utf-8" ?>`
	`<configuration>`
	`<configSections>`
	`<sectionGroup name="MyGroup" type="AppConfig.MyGroup,Appconfig">`
	`<section name="MySection" type="AppConfig.MySection,Appconfig" />`
	`</sectionGroup>`
	`<section name="MySection" type="AppConfig.MySection,Appconfig" />`
	`</configSections>`
	`<appSettings>`
	`<add key="A" value="a"/>`
	`<add key="B" value="b"/>`
	`<add key="C" value="c"/>`
	`</appSettings>`
	`<connectionStrings>`
	`<add connectionString="123" name="1"/>`
	`<add connectionString="456" name="2"/>`
	`</connectionStrings>`
	`<MySection Code="asdas">`
	`<Member Id="dasd"/>`
	`<Members>`
	`<add Id="1"/>`
	`<add Id="2"/>`
	`<add Id="3"/>`
	`</Members>`
	`</MySection>`
	`<MyGroup>`
	`<MySection Code="asdas1">`
	`<Member Id="dasd1"/>`
	`<Members>`
	`<add Id="12"/>`
	`<add Id="22"/>`
	`</Members>`
	`</MySection>`
	`</MyGroup>`
	`</configuration>`

指定AppSetting 的读取

	`public string GetAppSettingValue(string appSettingName)`
	`{`
	`return ConfigurationManager.AppSettings.AllKeys.FirstOrDefault(item => item.Equals(appSettingName)) != null ? ConfigurationManager.AppSettings[appSettingName] : null;`
	`}`

指定ConnecString的获取

	`public string GetConnectString(string name)`
	`{`
	`return ConfigurationManager.ConnectionStrings[name]?.ConnectionString;`
	`}`

表示配置文件中的节。

	`// 自定义一个Section`
	`internal class MySection : ConfigurationSection`
	`{`
	`[ConfigurationProperty(nameof(Code))]`
	`public string Code`
	`{`
	`get => base[nameof(Code)].ToString();`
	`}`
	`}`

需要在属性上使用ConfigurationPropertyAttribute

	`//调用方法`
	`public string GetMySectionCode()`
	`{`
	`return (ConfigurationManager.GetSection("MySection") as MySection)?.Code;`
	`}`

表示Section的成员

	`//根据Config 配置属性`
	`public class MyElement : ConfigurationElement`
	`{`
	`[ConfigurationProperty(nameof(Id))]`
	`public string Id`
	`{`
	`get => this[nameof(Id)].ToString();`
	`}`
	`}`
	`//同时在MySection 中进行扩展`
	`internal class MySection : ConfigurationSection`
	`{`
	`...`
	`[ConfigurationProperty(nameof(Member))]`
	`public MyElement Member`
	`{`
	`get => base[nameof(Member)] as MyElement;`
	`}`
	`...`
	`}`
	`//调用方法`
	`public string GetMySectionMember()`
	`{`
	`return (ConfigurationManager.GetSection("MySection") as MySection)?.Member?.Id;`
	`}`

表示Element的集合

	`//定义一个MyElement 的集合`
	`[ConfigurationCollection(typeof(MyElement))]`
	`internal class MyElementCollection : ConfigurationElementCollection`
	`{`
	`protected override ConfigurationElement CreateNewElement()`
	`{`
	`return new MyElement();`
	`}`

	`protected override object GetElementKey(ConfigurationElement element)`
	`{`
	`return (element as MyElement).Id;`
	`}`
	`}`
	`//在Section 中进行填充`
	`internal class MySection : ConfigurationSection`
	`{`
	`[ConfigurationProperty(nameof(Members)), ConfigurationCollection(typeof(MyElement))]`
	`public MyElementCollection Members`
	`{`
	`get => base[nameof(Members)] as MyElementCollection;`
	`}`
	`}`
	`//调用`
	`public int GetMySectionMembers()`
	`{`
	`return (int)(ConfigurationManager.GetSection("MySection") as MySection)?.Members?.Count;`
	`}`

在Section 外面在套一个类

	`public class MyGroup : ConfigurationSectionGroup`
	`{`
	`[ConfigurationProperty(nameof(MySection))]`
	`public MySection MySection { get => this.Sections[nameof(MySection)] as MySection; }`
	`}`

	`// 两种调用方式都可以`
	`public int GetMySectionMembersInGroup()`
	`{`
	`return (int)(ConfigurationManager.GetSection("MyGroup/MySection") as MySection)?.Members?.Count;`
	`}`
	`public int GetMySectionMembersInGroupByOpenConfig()`
	`{`
	`Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);`
	`var group = (MyGroup)config.GetSectionGroup("MyGroup");`
	`return group.MySection.Members.Count;`
	`}`

	`ExeConfigurationFileMap exeConfigurationFileMap = new ExeConfigurationFileMap() { ExeConfigFilename = @".\App1.config" };`
	`Configuration config = ConfigurationManager.OpenMappedExeConfiguration(exeConfigurationFileMap,ConfigurationUserLevel.None);`

这边加载方式与上面的不同后续一致

出处：https://www.cnblogs.com/dongyaosheng/p/16982434.html

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