在 ASP.NET Core 中读取环境变量

问题描述

使用 DNX 运行我的 ASP.NET Core 应用程序，我能够从命令行设置环境变量，然后像这样运行它:

Running my ASP.NET Core application using DNX, I was able to set environment variables from the command line and then run it like this:

set ASPNET_ENV = Production
dnx web

在 1.0 中使用相同的方法:

Using the same approach in 1.0:

set ASPNETCORE_ENVIRONMENT = Production
dotnet run

不起作用 - 应用程序似乎无法读取环境变量.

does not work - the application does not seem to be able to read environment variables.

Console.WriteLine(Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT"));

返回空值

我错过了什么?

推荐答案

您的问题是 = 周围的空格.

Your problem is spaces around =.

这会起作用(在结束引用之前注意空格):

This will work (attention to space before closing quote):

Console.WriteLine(Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT "));

这段代码中ASPNETCORE_ENVIRONMENT后面的空格不是错字！问题中的问题是有额外的空间(在 SET... 中)，因此您必须在 GetEnvironmentVariable() 中使用相同的空间.

The space after ASPNETCORE_ENVIRONMENT in this code is not a typo! The problem in the question was having extra space (in SET...), so you must use the same space in GetEnvironmentVariable().

如 Isantipov 在评论中所述，更好的解决方案是从 SET 命令中完全删除空格:

As noted by Isantipov in a comment, an even better solution is to remove the spaces entirely from the SET command:

set ASPNETCORE_ENVIRONMENT=Production

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