web.config 配置文件示例详解

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：

大功告成，读取的配置值完全正确。

大家可以使用这个方法快速迁移现有配置文件和代码过去啦。

以上就是web.config 配置文件示例详解的详细内容，更多请关注其它相关文章！

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