Second path fragment must not be a drive or UNC name - Create Subdirectory Error

问题

I have an exception in the third line ofthis code "Second path fragment must not be a drive or UNC name"

DirectoryInfo labdi = new DirectoryInfo(Back.mainfolderpath + @"\news\l");
DirectoryInfo tld = new DirectoryInfo(labdi.FullName + @"\" + NorA.sn.labl[i]);
tld = labdi.CreateSubdirectory(labdi.FullName + @"\" + NorA.sn.labl[i] + @"\");

There is no useful way on the web. Thank You.:!

回答1:

I ran into this one today and finally tracked it down.

The exception is trying to tell you that when a DirectoryInfo takes a path as an argument (e.g., CreateSubdirectory or GetFiles), it will object if the path argument contains the Root and throw this elusive exception.

So path arguments that contain "C:\" or "D:\" etc do not work. Armed with this context, the exception message actually makes a bit of sense.

In your code, you were using the FullName property and this string contains "C:\" or whatever the root is.

Given the age of the question, I should add c#, .NET 4.5, VS2013.

回答2:

The easiest solution to this problem is to use the static version of the Directory and File methods. You do not have to remove the root doing it this way. You also do not need the DirectoryInfo or FileInfo objects, they are what giving you headaches

string someFile = @"C:\somefolder\somefile.txt";
string directory = Path.GetDirectoryName(someFile);

foreach(var file in Directory.GetFiles(directory))
{
   File.Delete(file);
}

来源：https://stackoverflow.com/questions/18596774/second-path-fragment-must-not-be-a-drive-or-unc-name-create-subdirectory-error

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