应用程序如何访问由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，该设置环境变量在/从该需要访问env.var应用程序执行的应用。
中的 main（）的返回值（C＃编程指南） MSDN文章论述了一个批处理文件中使用。如果我尝试同样的，一切都很好;但什么是需要的是不是从一个批处理脚本，但在应用程序中运行。

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");

显然是不成功的。的Process.Start在一个完全不同的环境，我相信做出的应用程序的工作。换句话说，我需要在相同的环境中，以达到环境变量它设置主叫方运行应用程序应用程序。

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

如果你只是想设置从父孩子的环境：

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();

如果你不希望孩子继承父进程环境：

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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