Asp.net-core – Read environment variables in ASP.NET Core

asp.netasp.net-coreasp.net-core-mvckestrel-http-server

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

Using the same approach in 1.0:

set ASPNETCORE_ENVIRONMENT = Production
dotnet run

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

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

returns null

What am I missing?

Best Answer

Your problem is spaces around =.

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

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

Or remove spaces (better, see comment of @Isantipov below):

set ASPNETCORE_ENVIRONMENT=Production

P.S. Stop trying to "fix error with space" in this answer! It's not a typo! The real problem in question was with extra space (in SET...), so answer is either use same space in GetEnvironmentVariable() or remove it from SET... command!

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