问题描述
我正在尝试获取环境变量的实际值.
string query = string.Format("Select VariableValue From Win32_Environment Where Name = '{0}'", variableName);
using (var searcher = new ManagementObjectSearcher(query))
using (ManagementObject result = searcher.Get().Cast<ManagementObject>().FirstOrDefault())
{
if (result != null)
return Convert.ToString(result["VariableValue"]);
}
可行,但这是问题所在:传递"windir"作为名称获得%SystemRoot%"作为值.我真正想要的是实际路径,即"C:\ Windows".
我尝试使用递归来获取"SystemRoot"的值,但未找到匹配项.
如何确保返回实际值?
谢谢!
对于系统路径变量(如%SystemRoot%
)没有方便的方法.
您必须自己阅读相应的注册表值来查找这些值.以下是其中一些系统变量的列表(不完整):
-
%SystemRoot%:
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRoot
或
select windowsdirectory from Win32_OperatingSystem
可以通过检查%SystemRoot% 来确定 -
%SystemDrive%
诸如%AppData%之类的变量取决于用户,可以在
HKEY_USERS\<user SID>\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\AppData下找到
I'm trying to get the actual values of environment variables.
This is what I have so far:
string query = string.Format("Select VariableValue From Win32_Environment Where Name = '{0}'", variableName);
using (var searcher = new ManagementObjectSearcher(query))
using (ManagementObject result = searcher.Get().Cast<ManagementObject>().FirstOrDefault())
{
if (result != null)
return Convert.ToString(result["VariableValue"]);
}
That works, but here's the problem: passing 'windir' as name gets '%SystemRoot%' as value. What I really want is the actual path, i.e. 'C:\Windows'.
I tried using recursion to get the value of 'SystemRoot' but no matches were found.
How can I make sure that the real values get returned?
Thx!
For system path variables (like %SystemRoot%
) there's no convenient way.
You have to look for these values yourself by reading the corresponding registry values. Heres' a (not complete) list of some of these system variables:
%SystemRoot%:
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRoot
or
select windowsdirectory from Win32_OperatingSystem
%SystemDrive% can be determined by examining %SystemRoot%
Variables like %AppData% are user dependent and found under
HKEY_USERS\<user SID>\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\AppData
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