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Convert long to decimal in C #

I have a value stored in a variable that is of type "long".

long fileSizeInBytes = FileUploadControl.FileContent.Length;
Decimal fileSizeInMB = Convert.ToDecimal(fileSizeInBytes / (1024 * 1024));

I want to convert fileSizeInBytes to a decimal number, rounded to 2 decimal places (for example: 1.74, 2.45, 3.51), but I cannot get the required result. As a result, I get only one digit without decimals. Can anyone help me with this?

Thanks pending

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4 answers
Decimal fileSizeInMB = Convert.ToDecimal(fileSize) / (1024.0m * 1024.0m);

What you are doing is dividing the file by an integer, resulting in an integer, not a decimal. The remaining residues will be chopped off.

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, , , ..

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.Runtime.InteropServices;
using System.Threading;

namespace ConsoleApplication1
{ 

    class Program
    {

        /// <summary>
        /// Formats the given size to the order of magniture given
        /// Order is 1 for KB, 2 for MB etc up to 8, after that you get exponents for the same notations
        /// </summary>
        /// <param name="size">The total size in bytes</param>
        /// <param name="order">+1 for each 1024 B,M,... 0 for nothing</param>
        /// <param name="unit">Usually you will want B for bytes denotation, but maybe "bit" or "bi" or W for watt</param>
        /// <param name="decimal_places">Number of desired decimal places</param>
        /// <param name="add_space">Separate KB MB etc from the number with a space?</param>
        /// <returns>Formatted size</returns>
        public static string FormatSize(string unit, double size, int order, int decimal_places, bool add_space) {

            string[] suffixes = new string[] {"", "K","M","G","T","P","E","Z","Y"};

            int exponent = order - 8 > 0 ? order - 8 : 0;
            order -= exponent;

            string suffix = suffixes[order];

            while (order > 0) {
                size /= 1024;
                order--;
            }

            string sDecimals = new String('0', decimal_places);
            string sExponent = exponent != 0 ? "E" + exponent : "";
            string dot = decimal_places > 0 ? "." : "";

            return size.ToString("#,##0" + dot + sDecimals + sExponent) + (add_space ? " " : "") + suffix + unit;
        }

        public static void Main(string[] Args)
        {
            Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;

            string sz;
            sz = FormatSize("B", 1024, 1, 0, false);
            Console.WriteLine(sz);
            sz = FormatSize("B", 1024*1024 + 512, 1, 0, true);
            Console.WriteLine(sz);
            sz = FormatSize("W", 1024 * 1024 + 512, 1, 2, true);
            Console.WriteLine(sz);
            sz = FormatSize("B", 1024 * 1024 + 512, 2, 2, true);
            Console.WriteLine(sz);
            sz = FormatSize("B", 1024 * 1024 * 1024 + 1024 * 1024 * 1024 / 2, 3, 0, false);
            Console.WriteLine(sz);
            sz = FormatSize("bit", 1024 * 1024 * 1024 + 1024 * 1024 * 1024 / 2, 3, 1, false);
            Console.WriteLine(sz);
            sz = FormatSize("B", 1024 * 1024 * 1024 + 1024 * 1024 * 1024 / 2 - 1, 3, 2, false);
            Console.WriteLine(sz);
            sz = FormatSize("Ω", 1024 * 1024 * 1024 + 1024 * 1024 * 1024 / 2 - 1, 3, 1, false);
            Console.WriteLine(sz);
            sz = FormatSize("B", 1024 * 1024 * 1024 + 1024 * 1024 * 1024 / 2 - 10000000, 3, 2, false);
            Console.WriteLine(sz);
            sz = FormatSize("B", 1024 * 1024 * 1024 + 1024 * 1024 * 1024 / 2 - 1, 3, 0, false);
            Console.WriteLine(sz);
            sz = FormatSize("bit", 1208925819614629174706176f, 9, 2, true);
            Console.WriteLine(sz);
        }
    }
}

:

1KB
1,025 KB
1,024.50 KW
1.00 MB
2GB
1.5Gbit
1.50GB
1.5GΩ
1.49GB
1GB
1.00E1 Ybit
+2

I do not see fileSizeannounced anywhere, but I will consider it long. Therefore it fileSize / (1024 * 1024)is called up to a long value that does not contain decimal places, so you get something like:

Convert.ToDecimal(someLongValue)

Which will not have decimal places. First convert the division to double (or some other decimal number) before passing it toConvert.ToDecimal

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here is the function i use to display file size

//---------------------------------------------------------------------------------------------------------------------------------
        /// <summary>
        /// Formats from bytes to KB,MB,GB,TB 
        /// </summary>
        /// <param name="number">Bytes to format</param>
        /// <returns></returns>
        public static string AutoFileSize(long number)
        {
            double tmp = number;
            string suffix = " B ";
            if (tmp > 1024) { tmp = tmp / 1024; suffix = " KB"; }
            if (tmp > 1024) { tmp = tmp / 1024; suffix = " MB"; }
            if (tmp > 1024) { tmp = tmp / 1024; suffix = " GB"; }
            if (tmp > 1024) { tmp = tmp / 1024; suffix = " TB"; }
            return tmp.ToString("n") + suffix;
        }
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