你如何在 web.config 中放置环境变量? [英] How do you put environmental variables in web.config?

问题描述

我目前 遵循这些教程，我想从 Azure 的 Web 应用程序应用程序设置中调用明文字符串.我的印象是环境变量是 用于非配置文件.但是，我想对 web.config 文件使用相同的方法.

I am currently Following these tutorials, and I am wanting to call the clear text string from Azure's Application Settings for Web Apps. I am under the impression that environmental variables are used for non-config files. However, I am wanting to use the same methodology for web.config files.

  <connectionStrings configSource="/config/ConnectionStrings.config">
    <add name="DefaultConnection" connectionString="@Environment.GetEnvironmentalVariable('SQLAZURECONNSTR_DefaultConnection')" providerName="System.Data.SqlClient" />
  </connectionStrings>
  <appSettings file="configAppSettingsSecret.config">
    <!-- Code Removed for Conciseness-->
    <add key="mailAccount" value="@Environment.GetEnvironmentalVariable('APPSETTING_mailAccount')" />
    <add key="mailPassword" value="@Environment.GetEnvironmentalVariable('APPSETTING_mailPassword')" />
    <!-- Twilio-->
    <add key="TwilioSid" value="@Environment.GetEnvironmentalVariable('APPSETTING_TwilioSid')" />
    <add key="TwilioToken" value="@Environment.GetEnvironmentalVariable('APPSETTING_TwilioToken')" />
    <add key="TwilioFromPhone" value="@Environment.GetEnvironmentalVariable('APPSETTING_TwilioFromPhone')" />
  </appSettings>

注意:我包含了用于本地测试的 configSource="/example/".

Note: I included the configSource="/example/" for local testing.

推荐答案

对于应用程序，包括 Web 应用程序，在 Windows 上:

中的值只是字符串.如果您希望扩展环境变量，您的应用程序将需要自行完成.

For Applications, including Web Applications, On Windows:

The values in <appSettings> are just strings. If you want environmental variables to be expanded your application will need to do that itself.

执行此操作的常用方法是使用 cmd 语法 %variable% 然后使用 Environment.ExpandEnvironmentVariables 来扩展它们.

A common way of doing this is to use the cmd syntax %variable% and then using Environment.ExpandEnvironmentVariables to expand them.

规则不同(请参阅问题中的链接):但值似乎在环境变量中，因此，在配置文件中:

The rules are different (see links in the question): but the values appear to be in environment variables so, in the config file:

<add key='SomeSetting' value='%APPSETTING_some_key%'/>

然后检索:

var someSetting = Environment.ExpandEnvironmentVariables(
                     ConfigurationManager.AppSetting("SomeSetting"))

可能很好用.

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