应用程序如何访问另一个应用程序设置的环境变量？ [英] How can an application access the environment variable set by another application?

问题描述

在这种情况下，设置环境变量的应用程序在需要访问env.var的应用程序中执行。
Main（）返回值（C＃编程指南） msdn文章讨论了它在批处理文件中的使用。如果我也一样，一切都很好但是需要的是不要从批处理脚本运行，而是从应用程序中运行。

In this case the application which sets the environment variable is executed in/from the application that needs to access the env.var. The Main() Return Values (C# Programming Guide) msdn article discusses its use within a batch file. If I try the same, everything is fine; but what is required is to run not from a batch script but from within an application.

Process.Start("app","args"); // app sets the env.var.
string envVar = System.Environment.GetEnvironmentVariable("ERRORLEVEL");

显然不成功。 Process.Start使app在一个完全不同的环境中工作，我相信。换句话说，我需要在与调用者应用程序相同的环境中运行app，以达到它设置的环境变量。

was obviously unsuccessful. Process.Start made the "app" work in a completely different environment I believe. In other words, I need to run "app" in the same environment as the caller application in order to reach the environment variable it sets.

推荐答案

如果您只想从父级设置孩子的环境：

If you're just trying to set the child's environment from the parent:

var p = new Process();
p.StartInfo.EnvironmentVariables["TEST_ENV"] = "From parent";
p.StartInfo.UseShellExecute = false;
p.StartInfo.FileName = @"C:\src\bin\Debug\ChildProc.exe";
p.Start();

如果您不希望子代继承父进程环境：

If you don't want the child to inherit the parent process environment:

var psi = new ProcessStartInfo();
psi.EnvironmentVariables["TEST_ENV"] = "From parent";
psi.UseShellExecute = false;
psi.FileName = @"C:\src\bin\Debug\ChildProc.exe";
Process.Start(psi);

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