C# Get file size of array with paths

Question

I am new to arrays and I want to display the size (in MB) of multiple files into a textBox. The paths to the files are in an array.

var Files = Directory.GetFiles(Path, "*" + filetype, SearchOption.AllDirectories);

I saw this code in another post to get the size of a file:

long length = new System.IO.FileInfo(file).Length;

How can I add all of the file sizes to an int/string and write them into the textBox?

Answer 1

If i understand you correctly, just use Linq Select and string.Join

var results = Directory.GetFiles(Path, "*" + filetype, SearchOption.AllDirectories)
                        .Select(file => new FileInfo(file).Length);

 TextBox1.Text = string.Join(", ", results);

if you want to sum them, just use Enumerable.Sum

 TextBox1.Text = $"{results.Sum():N3}";

Update

public static class MyExtension
{
    public enum SizeUnits
    {
        Byte, KB, MB, GB, TB, PB, EB, ZB, YB
    }

    public static string ToSize(this Int64 value, SizeUnits unit)
    {
        return (value / (double)Math.Pow(1024, (Int64)unit)).ToString("0.00");
    }
}

 TextBox1.Text = results.Sum().ToSize();