How do you get the file size in C#?

user_41543 0
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I need a way to get the size of a file using C#, and not the size on disk. How is this possible?

Currently I have this loop

foreach (FileInfo file in downloadedMessageInfo.GetFiles())
{
    //file.Length (will this work)
}

Will this return the size or the size on disk?

filesize c#
7 Answers

The FileInfo class' Length property returns the size of the file (not the size on disk). If you want a formatted file size (i.e. 15 KB) rather than a long byte value you can use CSharpLib, a package I've made that adds more functionality to the FileInfo class. Here's an example:

using CSharpLib;
FileInfo info = new FileInfo("sample.txt");
Console.WriteLine(info.FormatBytes());  // Output: 15 MB
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