.NET Core环境变量返回null [英] .NET Core environment variable returns null

问题描述

我有一个.NET Core控制台应用程序.我正在尝试使用以下代码检索环境变量.

  var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT"); 

但是，变量环境"始终返回null.我通过设置环境变量"ASPNETCORE_ENVIRONMENT"

控制面板->系统属性->环境变量->系统变量

我还尝试使用命令 set ASPNETCORE_ENVIRONMENT = development 设置环境变量，但这也没有用.当我在Visual Studio中调试代码( F5 )时，变量始终返回null.我确保在设置变量或在代码中没有任何空格读取它.我有什么想念的吗?

解决方案

我认为设置环境变量仅在通过 dotnet run 启动控制台应用程序时有效:

全局设置ASPNETCORE_ENVIRONMENT环境变量时，它使dotnet在以下命令后打开的任何命令窗口中运行均有效值已设置.

来自:

I have a .NET Core console application. I'm trying to retrieve the environment variable using the below code.

var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

However, the variable "environment" always return null. I set the environment variable "ASPNETCORE_ENVIRONMENT" through

Control Panel -> System Properties -> Environment Variables -> System Variables

I also tried setting the environment variable using the command set ASPNETCORE_ENVIRONMENT=development, but that also did not work. When I debug the code (F5) in Visual Studio, the variable always return null. I have made sure that there aren't any spaces where I set the variable, or in my code where I read it. Is there anything I'm missing?

解决方案

I think setting the environment variable would only work if you started your console application via dotnet run:

When the ASPNETCORE_ENVIRONMENT environment variable is set globally, it takes effect for dotnet run in any command window opened after the value is set.

From: Use multiple environments in ASP.NET Core

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Try setting it it your Debug properties.

Right click your project in Visual Studio and select Properties → Debug.

Set the environment variable as shown in the image below.

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