How to format file sizes?

Emre Ozpalamutcu

14y1.8kVisual Basic .NET

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...

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes14y ago
Accepted 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 < 1000) return size + " bytes";

double fileSize = size;

if (size < 1024L * 1024)
{
return FileSizeToStringHelper(fileSize / 1024, "KB");
}

if (size < 1024L * 1024 * 1024)
{
return FileSizeToStringHelper(fileSize / 1024 / 1024, "MB");
}

if (size < 1024L * 1024 * 1024 * 1024)
{
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 Ozpalamutcu14y ago
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.
Vulpes14y ago
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 Ozpalamutcu14y ago
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 Ozpalamutcu14y ago
You are a legend! I asked 8 different forums including Microsoft and no body could solve the problem but you, awesome!
Emre Ozpalamutcu14y ago
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 < format.Length && FileSize >= 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;
}
}

}
}
Vulpes14y ago
Hmm, not as easy as it sounds :)

Anyway, try this:

using System;

public static class SizeUnit
{
public static string FileSizeToString(long size)
{
if (size < 1000) return size + " bytes";

double fileSize = size;

if (size < 1024L * 1024)
{
return FileSizeToStringHelper(fileSize/1024, "KB");
}

if (size < 1024L * 1024 * 1024)
{
return FileSizeToStringHelper(fileSize/1024/1024, "MB");
}

if (size < 1024L * 1024 * 1024 * 1024)
{
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();
}
}