【Core】.NET Core中读取App.config配置文件

1.项目中添加App.config文件

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。

2.如果是asp.net迁移过来的配置文件，去除config中和需要的配置无关的内容，主要是<system.web>、 <system.webServer>、<system.codedom>等典型asp.net标签。

<?xml version="1.0" encoding="utf-8"?>
<configuration>

  <!-- To customize the asp.net core module uncomment and edit the following section.
  For more info see https://go.microsoft.com/fwlink/?linkid=838655 -->
  <!--
  <system.webServer>
    <handlers>
      <remove name="aspNetCore"/>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified"/>
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" />
  </system.webServer>
  -->

  <appSettings>
    <add key="Email" value="[e-mail]" />
  </appSettings>

  <connectionStrings>
    <add name="TestCon" connectionString="Data Source=.;Initial Catalog=OWNDB;user id=sa;pwd=123456" />
  </connectionStrings>

</configuration>

3.引入【 System.Configuration.ConfigurationManager 】NUGET包

4.读取

var email = System.Configuration.ConfigurationManager.AppSettings["Email"];

var conn = System.Configuration.ConfigurationManager.ConnectionStrings["TestCon"];