What is the fastest way of getting a file length in .net?

Question

What is the fastest way of getting a file length in .net?

Note: I am accessing files via a network share.

So far I have

• 1.5ms FileInfo.Length
• .5ms FileStream().Length

Answer 1

Why not just use FileInfo.Length?

You could p/invoke the Win32 APIs: CreateFile, GetFileSizeEx, and CloseHandle if you really wanted to.

Answer 2

long size = File.OpenRead(path).Length;

Answer 3

You could PInvoke the FindFirstFile or GetFileAttributesEx API calls, but that seems like a lot of extra work that the FileInfo class is already doing for you. Otherwise I'm wondering the same thing Scott is: why would you not want to use FileInfo?

Answer 4

Derived from Adi_aks answer

public static long GetFileLength(string path)
{
    using (var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
    {
        return fileStream.Length;
    }
}