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Asked: 2026-05-11T08:19:42+00:00

I have a listview with 4 columns – Name, Extension, Size and Location. I

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I have a listview with 4 columns – Name, Extension, Size and Location. I have a method that takes the file size in bytes and converts to KB, MB, GB, etc as needed. An example output would be a 1024 byte file which is printed as ‘1KB’. This value is then placed in the listview.

What I need to do is sort the size column intelligently. Right now the sorting is just a simple comparison so 1025 KB is higher than 1024 MB. How can I make it ‘size aware’?

My current sorting code is from this KB article: http://support.microsoft.com/kb/319401 And here is my code that generates the file size text:

        public static string getDynamicFileSize(string fileName)     {         FileInfo fi = new FileInfo(fileName);         long sizeInBytes = fi.Length;         if (sizeInBytes >= 1073741824)         {             double sizeInGB = sizeInBytes / Math.Pow(1024, 3);             return Math.Round(sizeInGB, 2) + ' GB';         }          if (sizeInBytes >= 1048576)         {             double sizeInMB = sizeInBytes / Math.Pow(1024, 2);             return Math.Round(sizeInMB, 2) + ' MB';         }          if (sizeInBytes >= 1024)         {             double sizeInKB = sizeInBytes / Math.Pow(1024,1);             return Math.Round(sizeInKB, 2) + ' KB';         }          //No conversion needed         return sizeInBytes + ' bytes';     }

Thank you.

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1 Answer

  1. Most every object in .NET has a Tag member. This is a place where you can stuff anything extra you need to. In your case, I would stuff the file size in bytes into the ListViewSubItem.Tag property. Then, your sort algorithm can use that to sort by instead of the column text.

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