c# - 从 Asp.Net Core 中的 web.config 读取环境变量

Question

这是我的 web.config 文件:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified"/>
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false">
      <environmentVariables>
        <environmentVariable name="TEST_WEBCONFIG_VARIABLE" value="some test webconfig variable value" />
      </environmentVariables>
    </aspNetCore>
  </system.webServer>
</configuration>

如何从 Startup.cs 中的 web.config 读取 TEST_WEBCONFIG_VARIABLE？

我尝试了 Configuration["TEST_WEBCONFIG_VARIABLE"]，但配置值列表中不存在此变量。

Answer 1

从 Visual Studio 运行时，像这样使用 launchSettings.json-

  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development",
        "TEST_WEBCONFIG_VARIABLE":"123"
      }
    },
    "SamplePractice": {
      "commandName": "Project",
      "launchBrowser": true,
      "launchUrl": "http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development",
        "TEST_WEBCONFIG_VARIABLE":"123"
      }
    }
  }

由于launchSettings.json 仅限于Visual Studio，如果发布版本使用web.config 像这样-

<aspNetCore processPath="dotnet" arguments=".\MyAspNetCoreApplication.dll" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false" >
  <environmentVariables>
    <environmentVariable name="ASPNETCORE_ENVIRONMENT" value="Development" />
    <environmentVariable name="TEST_WEBCONFIG_VARIABLE" value="123" />
  </environmentVariables>
</aspNetCore>

并且此环境值将使用 -

跨应用程序读取

Environment.GetEnvironmentVariable("TEST_WEBCONFIG_VARIABLE");

注意!它仅在发布时有效。