如何获得根目录

Question

I have a file path as

D:\Accurev\PPF6-AvailableToUse_Test_4_4\eBizSol_App\Source\xyz.txt

If I do

Path.GetDirectoryName(fileName)

I get

D:\Accurev\PPF6-AvailableToUse_Test_4_4\eBizSol_App\Source

But I want to get only the root directory ie "D:\\\\"

How can I get it?

NB~ Is it possible without string splitting?

Answer 1

Use Path.GetPathRoot method provided by the framework

Gets the root directory information of the specified path

For your case you can use:

string rootPath = Path.GetPathRoot(filename);

Answer 2

String pathname= @"D:\Accurev\PPF6-AvailableToUse_Test_4_4\eBizSol_App\Source\xyz.txt";    
string root = Path.GetPathRoot(pathname); 

Answer 3

Directory.GetDirectoryRoot方法

Answer 4

You're in luck, there're several ways to do the same thing. Here're two of them:

1. Path.GetRootPath as other answers already shown

2. DirectoryInfo.Root property of FileInfo class:

    var fileName= @"D:\\Accurev\\PPF6-AvailableToUse_Test_4_4\\eBizSol_App\\Source\\xyz.txt"; var file=new FileInfo(fileName); var root=file.Directory.Root; 

Answer 5

You can use Path.GetPathRoot Method for this.

• This method gets the root directory information of the specified path.
• It returns the root directory of path, such as "C:\\", or null if path is null, or an empty string if path does not contain root directory information.

So, you can simply have string root = Path.GetPathRoot(fullFileName);

But , this method does not verify that the path or file name exists.

Possible patterns for the string returned by this method are on MSDN as follows:

• An empty string (path specified a relative path on the current drive or volume).
• "/" (path specified an absolute path on the current drive).
• "X:" (path specified a relative path on a drive, where X represents a drive or volume letter).
• "X:/" (path specified an absolute path on a given drive).
• "\\\\ComputerName\\SharedFolder" (a UNC path).