SetEnvironmentVariable doesn’t work for %var%\target.extension

Question

string var1 = "drive";
string var2 = "parent";
string var3 = "testpath";
string var4 = "mypath";
string var5 = "partpath";
string var6 = "mypath2";
string path1 = "E:\\";
string path2 = "%drive%ParentFolder";
string path3 = "%parent%\\Parent.txt";
string path4 = "E:\\ParentFolder\\Parent.txt";
string path5 = "E:\\ParentFolder\\";
string path6 = "%partpath%Parent.txt";
Environment.SetEnvironmentVariable(var1, path1, EnvironmentVariableTarget.User);
Environment.SetEnvironmentVariable(var2, path2, EnvironmentVariableTarget.User);
Environment.SetEnvironmentVariable(var3, path3, EnvironmentVariableTarget.User);
Environment.SetEnvironmentVariable(var4, path4, EnvironmentVariableTarget.User);
Environment.SetEnvironmentVariable(var5, path5, EnvironmentVariableTarget.User);
Environment.SetEnvironmentVariable(var6, path6, EnvironmentVariableTarget.User);

If I were to start %testpath% (which is var3 path3), result: %parent%Parent.txt not found

If I were to start %mypath% (which is var4 path4), result: successfully open Parent.txt

If I were to start %mypath2% (which is var6 path6), result: %parent%Parent.txt not found

It appears it has problem using %var%\\application.exe set through SetEnvironmentVariable.

Anyone shares the same problem?

Thanks in advance

Answer 1

如果递归逻辑不起作用，请用getenvironmentalvariable值替换。