web.config 配置文件示例详解

互联网 17-9-1

这篇文章主要给大家介绍了关于.NET Core 2.0迁移技巧之web.config 配置文件的相关资料，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面跟着小编来一起学习学习吧。

前言

相信大家应该都知道.NET Core现在不再支持原来的web.config配置文件了，取而代之的是json或xml配置文件。官方推荐的项目配置方式是使用appsettings.json配置文件，这对现有一些重度使用web.cofig配置的项目迁移可能是不可接受的。

但是好消息是，我们是可以直接在.NET Core 2.0项目种利用上现有的web.config的。本文将详细介绍.NET Core 2.0迁移之web.config 配置文件的相关内容，下面话不多说了，来一起看看详细的介绍吧。

迁移方法

1.首先在解决方案中引入System.Configuration.ConfigurationManager,只有引入它才可以让我们已有的读取web.config代码起作用.

2. 导入web.config文件到项目根目录，并将名称修改为app.config. 因为.NET Core的项目本质是控制台应用，所以ConfigurationManager的API会去默认读取app.config配置文件，而不是web.config配置文件。

3.去除config中和需要的配置无关的内容，主要是<system.web> , <system.webServer>和<system.codedom>等典型asp.net标签。

移除前：

<?xml version="1.0" encoding="utf-8"?>  <configuration> <configSections> <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --> <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /> </configSections> <connectionStrings> <add name="DefaultConnection" connectionString="Data Source=(LocalDb)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\aspnet-WebApplication24-20170824065102.mdf;Initial Catalog=aspnet-WebApplication24-20170824065102;Integrated Security=True"   providerName="System.Data.SqlClient" /> </connectionStrings>   <appSettings>   <add key="webpages:Version" value="3.0.0.0" />   <add key="webpages:Enabled" value="false" />   <add key="ClientValidationEnabled" value="true" />   <add key="UnobtrusiveJavaScriptEnabled" value="true" />   <add key="MyKey" value="true"/>   </appSettings>   <system.web>   <compilation debug="true" targetFramework="4.7" />   <httpRuntime targetFramework="4.7" />   <httpModules>   <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" />   </httpModules>   </system.web>   <runtime>   <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">   <dependentAssembly>   <assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />   <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />   </dependentAssembly>   <dependentAssembly>   <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />   <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />   </dependentAssembly>   <dependentAssembly>   <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />   <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />   </dependentAssembly>   <dependentAssembly>   <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />   <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />   </dependentAssembly>   <dependentAssembly>   <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />   <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />   </dependentAssembly>   <dependentAssembly>   <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />   <bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" />   </dependentAssembly>   </assemblyBinding>   </runtime>   <system.webServer>   <validation validateIntegratedModeConfiguration="false" />   <modules>   <remove name="ApplicationInsightsWebTracking" />   <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" />   </modules>   </system.webServer>   <system.codedom>   <compilers>   <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />   <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\"Web\" /optionInfer+" />   </compilers>   </system.codedom>  </configuration>

修改后：

<?xml version="1.0" encoding="utf-8"?>  <configuration>   <configSections>   <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->   <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />   </configSections>   <connectionStrings>   <add name="DefaultConnection" connectionString="Data Source=(LocalDb)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\aspnet-WebApplication24-20170824065102.mdf;Initial Catalog=aspnet-WebApplication24-20170824065102;Integrated Security=True"   providerName="System.Data.SqlClient" />   </connectionStrings>   <appSettings>   <add key="webpages:Version" value="3.0.0.0" />   <add key="webpages:Enabled" value="false" />   <add key="ClientValidationEnabled" value="true" />   <add key="UnobtrusiveJavaScriptEnabled" value="true" />   <add key="MyKey" value="true"/>   </appSettings>  </configuration>

4.测试原ASP.NET代码，查看读取配置值

using System.Configuration;    namespace WebConfigTest.Configuration  {   public class ConfigurationService   {   public static bool GetConfigValue(string key)   {   var result = false;   var val= ConfigurationManager.AppSettings[key];   if (val != null)   {   result = bool.Parse(val);   }   return result;   }   }  }

打个断点，看下读取配置值是否正确：