PATH 变量的 GetEnvironmentVariable() 和 SetEnvironmentVariable()

问题描述

我想用 C# 程序扩展当前的 PATH 变量.这里我有几个问题:

I want to extend the current PATH variable with a C# program. Here I have several problems:

1. 使用GetEnvironmentVariable("PATH", EnvironmentVariableTarget.Machine)替换占位符(即'%SystemRoot%system32'替换为当前路径<代码>'C:Windowssystem32').更新PATH变量，我不想用路径替换占位符.

1. Using GetEnvironmentVariable("PATH", EnvironmentVariableTarget.Machine) replaces the placeholders (i.e. '%SystemRoot%system32' is replaced by the current path 'C:Windowssystem32'). Updating the PATH variable, I dont want to replace the placeholder with the path.

SetEnvironmentVariable 之后，无法再从命令框中打开任何程序(即命令框中的 calc.exe 不起作用).我使用以下代码:

After SetEnvironmentVariable no program can't be opened from the command box anymore (i.e. calc.exe in the command box doesn't work). Im using following code:

String oldPath = Environment.GetEnvironmentVariable("PATH", EnvironmentVariableTarget.Machine);
Environment.SetEnvironmentVariable("PATH", oldPath + ";%MYDIR%", EnvironmentVariableTarget.Machine);

在使用 Windows 编辑和更改 PATH 变量后，一切都会再次运行.(我的东西需要改变，否则不会被覆盖)

After editing and changing the PATH variable with Windows everything works again. (I thing changes are required, otherwise it is not overwritten)

推荐答案

可以使用注册表读取更新:

You can use the registry to read and update:

string keyName = @"SYSTEMCurrentControlSetControlSession ManagerEnvironment";
//get non-expanded PATH environment variable            
string oldPath = (string)Registry.LocalMachine.CreateSubKey(keyName).GetValue("Path", "", RegistryValueOptions.DoNotExpandEnvironmentNames);

//set the path as an an expandable string
Registry.LocalMachine.CreateSubKey(keyName).SetValue("Path", oldPath + ";%MYDIR%",    RegistryValueKind.ExpandString);

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