环境变量在c＃ [英] environmental variable in a c#

问题描述

我使用以下命令在ac＃Console应用程序中为环境变量设置一个值。

I am using the following command to set a value to the environmental variable in a c# Console application.

 System.Environment.SetEnvironmentVariable(envvar, result,EnvironmentVariableTarget.Process);

在命令窗口中运行应用程序后，当我尝试回显该变量时，值。
我必须在批处理文件中使用这个应用程序。
我想要的功能，如SET命令。请帮助..

After running the application in the command window, when I try to echo that variable ,I cannot see the value. I have to use this application in a batch file. I want the functionality like SET command. Please help..

编辑：
我尝试使用System.Environment.SetEnvironmentVariable（envvar，result，EnvironmentVariableTarget.user）为了传播更改，我尝试了在Env VAr中传播更改。但我不能在同一命令窗口回显变量。

I tried using System.Environment.SetEnvironmentVariable(envvar,result,EnvironmentVariableTarget.user) and to propagate the change I tried this Propagating Change in Env VAr. But I cant echo the variable in same command window.

让我重写一个问题：
我想在c＃中为Env Var设置一个值。我必须能够在同一命令窗口中使用该变量（即我不应该打开一个新的cmd窗口来看到更改）。我们使用SET命令，我们可以立即使用该变量.. rt？我想要这样的功能。 Plzz帮助

Let me rephrase the question: I want to set a value to a Env Var in c#. I must be able to use that variable in same command window (ie i should not open a new cmd window to see the change). We use SET command and we can use that variable immediately .. rt ? I want such functionality. Plzz help

推荐答案

当您使用EnvironmentVariableTarget.Process时，变量集只会在当前进程中可见， ：

When you use EnvironmentVariableTarget.Process the variable set will only visible in the current process as you can see in this sample:

System.Environment.SetEnvironmentVariable("myVar", "myValue", EnvironmentVariableTarget.Process);
string s = System.Environment.GetEnvironmentVariable("myVar",EnvironmentVariableTarget.Process);

上面myVar将显示s =myValue，但在命令窗口中不可见。

Above myVar will show s = "myValue" but not visible in command window.

如果你想设置在命令窗口可见的值，那么你需要使用EnvironmentVariableTarget.User：

If you want to set the value visible at command windows then you need to use EnvironmentVariableTarget.User:

System.Environment.SetEnvironmentVariable("myVar", "myValue", EnvironmentVariableTarget.User);

这样设置myVar = myValue将被存储，然后你可以在命令窗口看到。

This way the setting myVar=myValue will be stored and then you can see on command windows.

详细示例位于这里

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