How to format file sizes?

Question

Currently I have this code:

[CODE]

public static class SizeUnit

{

public static string FileSizeToString(long size)

{

double FileSize = size;

string[] format = new string[] { "{0} bytes", "{0:0.00} KB", "{0:0.00} MB", "{0:0.00} GB", "{0:0.00} TB" };

int i = 0;

while (i < format.Length && FileSize >= 1024)

{

FileSize = (int)(100 * FileSize / 1024) / 100.0;

i++;

}

return string.Format(format[i], FileSize);

}

[/CODE]

The problem is I want it to display the size in this format with max 3 numbers!

3.90 MB | 322 KB | 4.33 KB | 300 Bytes | 0 Bytes | 3 MB | 12.5 MB | 300 MB | 32.5 KB | 700 Bytes
I use this code to display the result:

[CODE]

SizeUnit.FileSizeToString(fileInfo.Length)

[/CODE]

Thanks...

Vulpes · Answer

There was actually a bug in my previous code which I've corrected though it doesn't appear to have anything to do with the problem you mentioned. Anyway the following now seems to be working fine: namespace Disk_Cleaner__Test_ { public partial class Form1 : Form { public Form1() { InitializeComponent(); listView1.Columns.Add(File Name 225 System.Windows.Forms.HorizontalAlignment.Left); listView1.Columns.Add(Folder Path 325 System.Windows.Forms.HorizontalAlignment.Left); listView1.Columns.Add(File Size 100 System.Windows.Forms.HorizontalAlignment.Left); } public static class SizeUnit { public static string FileSizeToString(long size) { if (size double fileSize = size; if (size { return FileSizeToStringHelper(fileSize / 1024 KB); } if (size { return FileSizeToStringHelper(fileSize / 1024 / 1024 MB); } if (size { return FileSizeToStringHelper(fileSize / 1024 / 1024 / 1024 GB); } return FileSizeToStringHelper(fileSize / 1024 / 1024 / 1024 / 1024 TB); } private static string FileSizeToStringHelper(double fileSize string abbreviation) { string temp = fileSize.ToString(); int index = temp.IndexOf(.); if (index == -1 || index > 2) return temp.Substring(0 Math.Min(3 temp.Length)) +   + abbreviation; temp = temp.Substring(0 Math.Min(4 temp.Length)); if (temp.EndsWith(.0)) temp = temp.Replace(.0 ); else if (temp.EndsWith(.00)) temp = temp.Replace(.00 ); return temp +   + abbreviation; } } private void button1_Click(object sender EventArgs e) { listView1.Items.Clear(); string[] directories = new string[] { @C:\Windows @C:\Users\Emre\AppData\Local\CrashDumps }; string[] extensions = new string[] { * }; foreach (var dir in directories) { var dirInfo = new DirectoryInfo(dir); foreach (var ext in extensions) { foreach (var fileInfo in dirInfo.GetFiles(ext)) { listView1.Items.Add(new ListViewItem(new string[] { fileInfo.Name Path.GetDirectoryName(fileInfo.FullName) + @\ SizeUnit.FileSizeToString(fileInfo.Length) })); } } } } private void checkBox1_CheckedChanged(object sender EventArgs e) { foreach (ListViewItem listItem in listView1.Items) { if (checkBox1.Checked) listItem.Checked = true; else listItem.Checked = false; } } } }

Emre Ozpalamutcu · Answer

I'm not a C# expert so I won't be able to edit that code into the way I want thanks for the help. I will just keep checking Google maybe I can find something closer to what I want and edit it.

Vulpes · Answer

You have to use the ListViewItemSorter property in combination with the Sort() method if you want to be able to sort on different columns. There's an example here on MSDN: http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.listviewitemsorter.aspx

Emre Ozpalamutcu · Answer

Do you how I could sort the columns on the list view (Asc & Dsc) I want users to be able to sort the each column by clicking each column header. I made column header click able but I been searching Google for hours and still couldn't figure out how to sort the items. Thanks.

Emre Ozpalamutcu · Answer

You are a legend! I asked 8 different forums including Microsoft and no body could solve the problem but you awesome!

Emre Ozpalamutcu · Answer

Sorry but it doesn't work what happens is that it just writes each file 10 times and altough its the same file it has different sizes. and if you re-write it plz dont include console stuff and if it might help you here is all of my code: namespace Disk_Cleaner__Test_ { public partial class Form1 : Form { public Form1() { InitializeComponent(); listView1.Columns.Add(File Name 225 System.Windows.Forms.HorizontalAlignment.Left); listView1.Columns.Add(Folder Path 325 System.Windows.Forms.HorizontalAlignment.Left); listView1.Columns.Add(File Size 100 System.Windows.Forms.HorizontalAlignment.Left); } public static class SizeUnit { public static string FileSizeToString(long size) { double FileSize = size; string[] format = new string[] { {0} bytes {0:0.00} KB {0:0.00} MB {0:0.00} GB {0:0.00} TB }; int i = 0; while (i = 1024) { FileSize = (int)(100 * FileSize / 1024) / 100.0; i++; } return string.Format(format[i] FileSize); } } private void button1_Click(object sender EventArgs e) { listView1.Items.Clear(); string[] directories = new string[] { @C:\Windows @C:\Users\Emre\AppData\Local\CrashDumps }; string[] extensions = new string[] { * }; foreach (var dir in directories) { var dirInfo = new DirectoryInfo(dir); foreach (var ext in extensions) { foreach (var fileInfo in dirInfo.GetFiles(ext)) { listView1.Items.Add(new ListViewItem(new string[] { fileInfo.Name Path.GetDirectoryName(fileInfo.FullName) + @\ SizeUnit.FileSizeToString(fileInfo.Length) })); } } } } private void checkBox1_CheckedChanged(object sender EventArgs e) { foreach (ListViewItem listItem in listView1.Items) { if (checkBox1.Checked) listItem.Checked = true; else listItem.Checked = false; } } } }

Vulpes · Answer

Hmm not as easy as it sounds :) Anyway try this: using System; public static class SizeUnit { public static string FileSizeToString(long size) { if (size double fileSize = size; if (size { return FileSizeToStringHelper(fileSize/1024 KB); } if (size { return FileSizeToStringHelper(fileSize/1024/1024 MB); } if (size { return FileSizeToStringHelper(fileSize/1024/1024/1024 GB); } return FileSizeToStringHelper(fileSize/1024/1024/1024/1024 TB); } private static string FileSizeToStringHelper(double fileSize string abbreviation) { string temp = fileSize.ToString(); int index = temp.IndexOf(.); if (index == -1 || index > 2) return temp.Substring(0 Math.Min(3 temp.Length) ) +   + abbreviation; // EDITED temp = temp.Substring(0 Math.Min(4 temp.Length) ); // EDITED if (temp.EndsWith(.0)) temp = temp.Replace(.0 ); else if (temp.EndsWith(.00)) temp = temp.Replace(.00 ); return temp +   + abbreviation; } } class Program { static void Main() { long[] numbers = {4090000 330000 4440 300 0 3150000 13110000 315000000 33300 700 1002 4300000000L}; foreach(long number in numbers) Console.WriteLine({0} bytes => {1} number SizeUnit.FileSizeToString(number)); Console.ReadKey(); } }