Get size of file on disk

user_167897 0
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var length = new System.IO.FileInfo(path).Length;

This gives the logical size of the file, not the size on the disk.

I wish to get the size of a file on the disk in C# (preferably without interop) as would be reported by Windows Explorer.

It should give the correct size, including for:

  • A compressed file
  • A sparse file
  • A fragmented file
filesize .net c#
4 Answers

I think it will be like this:

double ifileLength = (finfo.Length / 1048576); //return file size in MB ....

I'm still doing some testing for this, to get a confirmation.

user_19119470
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