使用c＃的窗口中没有设置环境。我哪里错了？ [英] Environment is not being set in windows using c#. Where am I going wrong?

问题描述

string path = System.Environment.GetEnvironmentVariable("Path");
Console.WriteLine(path);
if (!path.Contains("C:\ccstg"))
{
    if (!path.EndsWith(";"))
        path = path + ';';
    var v=@"C:\ccstg;";
    path = path + v;
    Environment.SetEnvironmentVariable("Path",path);
    Console.WriteLine(path);
    Console.WriteLine("Path Set");
    Console.ReadKey();
}

我正在尝试使用c＃设置路径环境变量，我可以得到路径，但在设置它时未设置。它也不显示任何错误。我已经尝试以管理员身份运行，没有帮助。

I am trying to set path environment variable using c#, I am able to get "Path" but while setting it is not being set. It doesn't show any error either. I have tried running it as administrator also , no help.

有没有人在这里缺少什么？

Does anybody what am I missing here ?

推荐答案

首先，您需要更加谨慎的使用字符串文字，因为\c不是有效的字符串文字转义序列，所以您发布的代码将无法编译。要修复：

Firstly, you need to be a little more careful with your string literals, the code you posted won't compile because "\c" is not a valid string literal escape sequence. To fix:

        string newPathComponent = @"C:\ccstg";
        if (!path.Contains(newPathComponent))
        {
            if (!path.EndsWith(";"))
                path = path + ';';
            path = path + newPathComponent;
            Environment.SetEnvironmentVariable("Path", path);

现在，此代码可以在进程 >。如果要永久设置路径，则需要使用 Environment.SetEnvironmentVariable方法（String，String，EnvironmentVariableTarget） ，例如：

Now, this code works and sets the path for the duration of the process. If you want to set the path permanently, you need to use Environment.SetEnvironmentVariable Method (String, String, EnvironmentVariableTarget), for instance:

            var target = EnvironmentVariableTarget.User; // Or EnvironmentVariableTarget.Machine
            Environment.SetEnvironmentVariable("Path", path, target);

更多这里。

但是，如果你这样做，你必须小心地将您的路径组件添加到与 EnvironmentVariableTarget 相关联的路径中。这是因为％PATH％环境变量实际上是从几个来源。如果您不小心，可以将组合路径复制到只有 EnvironmentVariableTarget.Machine 或 EnvironmentVariableTarget.User 源 - 你不想做的。

However, if you do that, you have to be careful to add your path component only to the path associated with that EnvironmentVariableTarget. That's because the %PATH% environment variable is actually combined from several sources. If you aren't careful, you may copy the combined path into just the EnvironmentVariableTarget.Machine or EnvironmentVariableTarget.User source -- which you do not want to do.

因此：

    static void AddToEnvironmentPath(string pathComponent, EnvironmentVariableTarget target)
    {
        string targetPath = System.Environment.GetEnvironmentVariable("Path", target) ?? string.Empty;
        if (!string.IsNullOrEmpty(targetPath) && !targetPath.EndsWith(";"))
            targetPath = targetPath + ';';
        targetPath = targetPath + pathComponent;
        Environment.SetEnvironmentVariable("Path", targetPath, target);
    }

最后，如果你在 Visual Studio主机进程进行调试，我观察到，如果您使用 Environment.SetEnvironmentVariable （路径，路径，EnvironmentVariableTarget.User），永久环境的更改将不会被选中，直到您退出并重新启动visual studio。与视觉工作室托管过程有些奇怪，我估计。为了处理这个奇怪的情况，你可能需要同时执行以下操作：

Finally, if you are running inside the Visual Studio Hosting Process for debugging, I have observed that if you use Environment.SetEnvironmentVariable("Path",path, EnvironmentVariableTarget.User), changes to the permanent environment will not be picked up until you exit and restart visual studio. Something weird to do with the visual studio hosting process, I reckon. To handle this odd scenario you might want to do both:

AddToEnvironmentPath(@"C:\ccstg", EnvironmentVariableTarget.User)
AddToEnvironmentPath(@"C:\ccstg", EnvironmentVariableTarget.Process)

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