<p>Is there any easy way to create a class that uses <strong>IFormatProvider</strong> that writes out a user-friendly file-size?</p>

<pre><code>public static string GetFileSizeString(string filePath)
{
    FileInfo info = new FileInfo(@"c:\windows\notepad.exe");
    long size = info.Length;
    string sizeString = size.ToString(FileSizeFormatProvider); // This is where the class does its magic...
}
</code></pre>

<p>It should result in strings formatted something like "<em>2,5 MB</em>", "<em>3,9 GB</em>", "<em>670 bytes</em>" and so on.</p>

I use this one, I get it from the web
```
```
public class FileSizeFormatProvider : IFormatProvider, ICustomFormatter
{
    public object GetFormat(Type formatType)
    {
        if (formatType == typeof(ICustomFormatter)) return this;
        return null;
    }

    private const string fileSizeFormat = "fs";
    private const Decimal OneKiloByte = 1024M;
    private const Decimal OneMegaByte = OneKiloByte * 1024M;
    private const Decimal OneGigaByte = OneMegaByte * 1024M;

    public string Format(string format, object arg, IFormatProvider formatProvider)
    {    
        if (format == null || !format.StartsWith(fileSizeFormat))    
        {    
            return defaultFormat(format, arg, formatProvider);    
        }

        if (arg is string)    
        {    
            return defaultFormat(format, arg, formatProvider);    
        }

        Decimal size;

        try    
        {    
            size = Convert.ToDecimal(arg);    
        }    
        catch (InvalidCastException)    
        {    
            return defaultFormat(format, arg, formatProvider);    
        }

        string suffix;
        if (size > OneGigaByte)
        {
            size /= OneGigaByte;
            suffix = "GB";
        }
        else if (size > OneMegaByte)
        {
            size /= OneMegaByte;
            suffix = "MB";
        }
        else if (size > OneKiloByte)
        {
            size /= OneKiloByte;
            suffix = "kB";
        }
        else
        {
            suffix = " B";
        }

        string precision = format.Substring(2);
        if (String.IsNullOrEmpty(precision)) precision = "2";
        return String.Format("{0:N" + precision + "}{1}", size, suffix);

    }

    private static string defaultFormat(string format, object arg, IFormatProvider formatProvider)
    {
        IFormattable formattableArg = arg as IFormattable;
        if (formattableArg != null)
        {
            return formattableArg.ToString(format, formatProvider);
        }
        return arg.ToString();
    }

}
```
```
an example of use would be:
```
```
Console.WriteLine(String.Format(new FileSizeFormatProvider(), "File size: {0:fs}", 100));
Console.WriteLine(String.Format(new FileSizeFormatProvider(), "File size: {0:fs}", 10000));
```
```
Credits for
http://flimflan.com/blog/FileSizeFormatProvider.aspx
There is a problem with ToString(), it's expecting a NumberFormatInfo type that implements IFormatProvider but the NumberFormatInfo class is sealed :(
If you're using C# 3.0 you can use an extension method to get the result you want:
```
```
public static class ExtensionMethods
{
    public static string ToFileSize(this long l)
    {
        return String.Format(new FileSizeFormatProvider(), "{0:fs}", l);
    }
}
```
```
You can use it like this.
```
```
long l = 100000000;
Console.WriteLine(l.ToFileSize());
```
```
Hope this helps.