web.config 設定檔樣本詳解

這篇文章主要給大家介紹了關於.NET Core 2.0遷移技巧之web.config 設定檔的相關資料，文中通過範例程式碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面跟著小編來一起學習學習吧。

前言

相信大家應該都知道.NET Core現在不再支援原來的web.config設定檔了，取而代之的是json或xml設定檔。官方推薦項目配置方式是使用appsettings.json設定檔，這對現有一些重度使用web.cofig配置的項目遷移可能是不可接受的。

但是好訊息是，我們是可以直接在.NET Core 2.0項目種利用上現有的web.config的。本文將詳細介紹.NET Core 2.0遷移之web.config 設定檔的相關內容，下面話不多說了，來一起看看詳細的介紹吧。

遷移方法

1.首先在解決方案中引入System.Configuration.ConfigurationManager,只有引入它才可以讓我們已有的讀取web.config代碼起作用.

　　

2. 匯入web.config檔案到項目根目錄，並將名稱修改為app.config. 因為.NET Core的項目本質是控制台應用，所以ConfigurationManager的API會去預設讀取app.config設定檔，而不是web.config設定檔。

3.去除config中和需要的配置無關的內容，主要是<system.web> , <system.webServer>和<system.codedom>等典型asp.net標籤。

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>

修改後：

<?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.測試原ASP.NET代碼，查看讀取配置值

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; } }}

打個斷點，看下讀取配置值是否正確：

大功告成，讀取的配置值完全正確。

大家可以使用這個方法快速遷移現有設定檔和代碼過去啦。