是否.NET提供了一种简单的方法将字节转换为KB,MB,GB等?(Does .NET provide

2019-07-18 14:58发布

只是想知道如果.NET提供了一个干净的方式来做到这一点:

int64 x = 1000000;
string y = null;
if (x / 1024 == 0) {
    y = x + " bytes";
}
else if (x / (1024 * 1024) == 0) {
    y = string.Format("{0:n1} KB", x / 1024f);
}

等等...

Answer 1:

这是一个相当简洁的方式来做到这一点:

static readonly string[] SizeSuffixes = 
                   { "bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
static string SizeSuffix(Int64 value, int decimalPlaces = 1)
{
    if (decimalPlaces < 0) { throw new ArgumentOutOfRangeException("decimalPlaces"); }
    if (value < 0) { return "-" + SizeSuffix(-value); } 
    if (value == 0) { return string.Format("{0:n" + decimalPlaces + "} bytes", 0); }

    // mag is 0 for bytes, 1 for KB, 2, for MB, etc.
    int mag = (int)Math.Log(value, 1024);

    // 1L << (mag * 10) == 2 ^ (10 * mag) 
    // [i.e. the number of bytes in the unit corresponding to mag]
    decimal adjustedSize = (decimal)value / (1L << (mag * 10));

    // make adjustment when the value is large enough that
    // it would round up to 1000 or more
    if (Math.Round(adjustedSize, decimalPlaces) >= 1000)
    {
        mag += 1;
        adjustedSize /= 1024;
    }

    return string.Format("{0:n" + decimalPlaces + "} {1}", 
        adjustedSize, 
        SizeSuffixes[mag]);
}

而这里的原始实现我建议,这可能是稍微慢一些,但更容易一点如下:

static readonly string[] SizeSuffixes = 
                  { "bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };

static string SizeSuffix(Int64 value, int decimalPlaces = 1)
{
    if (value < 0) { return "-" + SizeSuffix(-value); } 

    int i = 0;
    decimal dValue = (decimal)value;
    while (Math.Round(dValue, decimalPlaces) >= 1000)
    {
        dValue /= 1024;
        i++;
    }

    return string.Format("{0:n" + decimalPlaces + "} {1}", dValue, SizeSuffixes[i]);
}

Console.WriteLine(SizeSuffix(100005000L));


Answer 2:

检出ByteSize库。 这是System.TimeSpan为字节!

它为您处理转换和格式化。

var maxFileSize = ByteSize.FromKiloBytes(10);
maxFileSize.Bytes;
maxFileSize.MegaBytes;
maxFileSize.GigaBytes;

它也确实字符串表示和解析。

// ToString
ByteSize.FromKiloBytes(1024).ToString(); // 1 MB
ByteSize.FromGigabytes(.5).ToString();   // 512 MB
ByteSize.FromGigabytes(1024).ToString(); // 1 TB

// Parsing
ByteSize.Parse("5b");
ByteSize.Parse("1.55B");


Answer 3:

因为其他人都在发布自己的方法,我想我会发布的扩展方法我通常使用这个:

编辑:增加INT /长变种...并修复了copypasta错字...

public static class Ext
{
    private const long OneKb = 1024;
    private const long OneMb = OneKb * 1024;
    private const long OneGb = OneMb * 1024;
    private const long OneTb = OneGb * 1024;

    public static string ToPrettySize(this int value, int decimalPlaces = 0)
    {
        return ((long)value).ToPrettySize(decimalPlaces);
    }

    public static string ToPrettySize(this long value, int decimalPlaces = 0)
    {
        var asTb = Math.Round((double)value / OneTb, decimalPlaces);
        var asGb = Math.Round((double)value / OneGb, decimalPlaces);
        var asMb = Math.Round((double)value / OneMb, decimalPlaces);
        var asKb = Math.Round((double)value / OneKb, decimalPlaces);
        string chosenValue = asTb > 1 ? string.Format("{0}Tb",asTb)
            : asGb > 1 ? string.Format("{0}Gb",asGb)
            : asMb > 1 ? string.Format("{0}Mb",asMb)
            : asKb > 1 ? string.Format("{0}Kb",asKb)
            : string.Format("{0}B", Math.Round((double)value, decimalPlaces));
        return chosenValue;
    }
}


Answer 4:

我会用它解决Extension methodsMath.Pow功能和Enums

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");
    }
}

并使用它,如:

string h = x.ToSize(MyExtension.SizeUnits.KB);


Answer 5:

号主要是因为它是一个相当小众需求,有太多的可能的变化。 (它是 “KB”, “KB” 或 “KO” 是一兆1024个* 1024个字节,或者1024个* 1000个字节 - ?!是的,有些地方使用)



Answer 6:

下面是更容易比你扩展的选项,但没有的,没有内置到库本身。

private static List<string> suffixes = new List<string> { " B", " KB", " MB", " GB", " TB", " PB" };
public static string Foo(int number)
{
    for (int i = 0; i < suffixes.Count; i++)
    {
        int temp = number / (int)Math.Pow(1024, i + 1);
        if (temp == 0)
            return (number / (int)Math.Pow(1024, i)) + suffixes[i];
    }
    return number.ToString();
}


Answer 7:

最投票回答的短版与TB值的问题。

我调整了它恰当地也处理TB值,仍然没有一个循环,还增加了一个小错误检查负值。 这里是我的解决方案:

static readonly string[] SizeSuffixes = { "bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
static string SizeSuffix(long value, int decimalPlaces = 0)
{
    if (value < 0)
    {
        throw new ArgumentException("Bytes should not be negative", "value");
    }
    var mag = (int)Math.Max(0, Math.Log(value, 1024));
    var adjustedSize = Math.Round(value / Math.Pow(1024, mag), decimalPlaces);
    return String.Format("{0} {1}", adjustedSize, SizeSuffixes[mag]);
}


Answer 8:

    private string GetFileSize(double byteCount)
    {
        string size = "0 Bytes";
        if (byteCount >= 1073741824.0)
            size = String.Format("{0:##.##}", byteCount / 1073741824.0) + " GB";
        else if (byteCount >= 1048576.0)
            size = String.Format("{0:##.##}", byteCount / 1048576.0) + " MB";
        else if (byteCount >= 1024.0)
            size = String.Format("{0:##.##}", byteCount / 1024.0) + " KB";
        else if (byteCount > 0 && byteCount < 1024.0)
            size = byteCount.ToString() + " Bytes";

        return size;
    }

    private void btnBrowse_Click(object sender, EventArgs e)
    {
        if (openFile1.ShowDialog() == DialogResult.OK)
        {
            FileInfo thisFile = new FileInfo(openFile1.FileName);

            string info = "";

            info += "File: " + Path.GetFileName(openFile1.FileName);
            info += Environment.NewLine;
            info += "File Size: " + GetFileSize((int)thisFile.Length);

            label1.Text = info;
        }
    }

这是做一个藏汉方式(数字1073741824.0为1024 * 1024 * 1024又名GB)



Answer 9:

基于NeverHopeless的优雅的解决方案:

private static readonly KeyValuePair<long, string>[] Thresholds = 
{
    // new KeyValuePair<long, string>(0, " Bytes"), // Don't devide by Zero!
    new KeyValuePair<long, string>(1, " Byte"),
    new KeyValuePair<long, string>(2, " Bytes"),
    new KeyValuePair<long, string>(1024, " KB"),
    new KeyValuePair<long, string>(1048576, " MB"), // Note: 1024 ^ 2 = 1026 (xor operator)
    new KeyValuePair<long, string>(1073741824, " GB"),
    new KeyValuePair<long, string>(1099511627776, " TB"),
    new KeyValuePair<long, string>(1125899906842620, " PB"),
    new KeyValuePair<long, string>(1152921504606850000, " EB"),

    // These don't fit into a int64
    // new KeyValuePair<long, string>(1180591620717410000000, " ZB"), 
    // new KeyValuePair<long, string>(1208925819614630000000000, " YB") 
};

/// <summary>
/// Returns x Bytes, kB, Mb, etc... 
/// </summary>
public static string ToByteSize(this long value)
{
    if (value == 0) return "0 Bytes"; // zero is plural
    for (int t = Thresholds.Length - 1; t > 0; t--)
        if (value >= Thresholds[t].Key) return ((double)value / Thresholds[t].Key).ToString("0.00") + Thresholds[t].Value;
    return "-" + ToByteSize(-value); // negative bytes (common case optimised to the end of this routine)
}

也许有过多的评论,但我倾向于让他们防止自己犯同样的错误在今后的访问...



Answer 10:

我曾经联合一些问题的答案在这里变成了两个方法,工作的伟大。 第二种方法将在下文从一个字节串(如1.5.1 GB)转换回字节(如1621350140),其为长型的值。 我希望这是对别人寻找一个解决方案,以字节转换为字符串并回字节有用。

public static string BytesAsString(float bytes)
{
    string[] suffix = { "B", "KB", "MB", "GB", "TB" };
    int i;
    double doubleBytes = 0;

    for (i = 0; (int)(bytes / 1024) > 0; i++, bytes /= 1024)
    {
        doubleBytes = bytes / 1024.0;
    }

    return string.Format("{0:0.00} {1}", doubleBytes, suffix[i]);
}

public static long StringAsBytes(string bytesString)
{
    if (string.IsNullOrEmpty(bytesString))
    {
        return 0;
    }

    const long OneKb = 1024;
    const long OneMb = OneKb * 1024;
    const long OneGb = OneMb * 1024;
    const long OneTb = OneGb * 1024;
    double returnValue;
    string suffix = string.Empty;

    if (bytesString.IndexOf(" ") > 0)
    {
        returnValue = float.Parse(bytesString.Substring(0, bytesString.IndexOf(" ")));
        suffix = bytesString.Substring(bytesString.IndexOf(" ") + 1).ToUpperInvariant();
    }
    else
    {
        returnValue = float.Parse(bytesString.Substring(0, bytesString.Length - 2));
        suffix = bytesString.ToUpperInvariant().Substring(bytesString.Length - 2);
    }

    switch (suffix)
    {
        case "KB":
            {
                returnValue *= OneKb;
                break;
            }

        case "MB":
            {
                returnValue *= OneMb;
                break;
            }

        case "GB":
            {
                returnValue *= OneGb;
                break;
            }

        case "TB":
            {
                returnValue *= OneTb;
                break;
            }

        default:
            {
                break;
            }
    }

    return Convert.ToInt64(returnValue);
}


Answer 11:

没有。

但是你可以实现这样的;

    static double ConvertBytesToMegabytes(long bytes)
    {
    return (bytes / 1024f) / 1024f;
    }

    static double ConvertKilobytesToMegabytes(long kilobytes)
    {
    return kilobytes / 1024f;
    }

还检查了如何正确地转换文件大小以字节为单位成百万或千兆字节?



Answer 12:

怎么样:

public void printMB(uint sizekB)   
{
    double sizeMB = (double) sizekB / 1024;
    Console.WriteLine("Size is " + sizeMB.ToString("0.00") + "MB");
}

例如像电话

printMB(123456);

将导致输出

"Size is 120,56 MB"


Answer 13:

我去JerKimballs的解决方案,并竖起大拇指了这一点。 不过,我想补充/指出,这确实是争议作为一个整体的问题。 在我的研究(其他原因),我想出了以下的信息。

当正常的人(我听说它们存在)讲GB的他们指的是公制系统,其中1000至3功率从原来的字节数==千兆字节数。 然而,当然存在IEC / JEDEC标准,是很好的总结在维基百科,其中代替1000〜x的功率它们具有1024其中用于物理存储设备(我想逻辑如亚马逊等)是指不断增长的指标之间的差异VS IEC。 因此,例如1个TB == 1 TB的指标是1000 4的权力,但IEC正式条款类似号码为1的TiB,tebibyte为1024至4.将电源但是,唉,在非技术的应用(我会由观众去)的标准是度量,并在自己的应用程序供内部使用目前我解释文件的差异。 但是,为了显示我甚至不提供任何东西,但度量。 在内部,即使它不是在我的应用我只存储字节相关的和做显示的计算。

作为一个方面说明我觉得有些平淡了.NET Framework AFAIK(和我常常是错的感谢是权力),甚至在它的4.5化身不包含这事,在任何图书馆内。 人们期望某种形式的开源库是NuGettable在某些时候,但我承认这是一个小的忿怒。 在另一方面System.IO.DriveInfo和其他人也只有字节(长),这是相当清楚的。



Answer 14:

https://github.com/logary/logary/blob/master/src/Logary/DataModel.fs#L832-L837

let scaleBytes (value : float) : float * string =
    let log2 x = log x / log 2.
    let prefixes = [| ""; "Ki"; "Mi"; "Gi"; "Ti"; "Pi" |] // note the capital K and the 'i'
    let index = int (log2 value) / 10
    1. / 2.**(float index * 10.),
sprintf "%s%s" prefixes.[index] (Units.symbol Bytes)


Answer 15:

public static class MyExtension
{
    public static string ToPrettySize(this float Size)
    {
        return ConvertToPrettySize(Size, 0);
    }
    public static string ToPrettySize(this int Size)
    {
        return ConvertToPrettySize(Size, 0);
    }
    private static string ConvertToPrettySize(float Size, int R)
    {
        float F = Size / 1024f;
        if (F < 1)
        {
            switch (R)
            {
                case 0:
                    return string.Format("{0:0.00} byte", Size);
                case 1:
                    return string.Format("{0:0.00} kb", Size);
                case 2:
                    return string.Format("{0:0.00} mb", Size);
                case 3:
                    return string.Format("{0:0.00} gb", Size);
            }
        }
        return ConvertToPrettySize(F, ++R);
    }
}


Answer 16:

怎么样递归:

private static string ReturnSize(double size, string sizeLabel)
{
  if (size > 1024)
  {
    if (sizeLabel.Length == 0)
      return ReturnSize(size / 1024, "KB");
    else if (sizeLabel == "KB")
      return ReturnSize(size / 1024, "MB");
    else if (sizeLabel == "MB")
      return ReturnSize(size / 1024, "GB");
    else if (sizeLabel == "GB")
      return ReturnSize(size / 1024, "TB");
    else
      return ReturnSize(size / 1024, "PB");
  }
  else
  {
    if (sizeLabel.Length > 0)
      return string.Concat(size.ToString("0.00"), sizeLabel);
    else
      return string.Concat(size.ToString("0.00"), "Bytes");
  }
}

然后,你可以调用它:

ReturnSize(size, string.Empty);


Answer 17:

正如上面贴的递归是最喜欢的方式,用对数的帮助。

下面的函数有3个参数:输入,输出的尺寸约束,即第三个参数。

int ByteReDim(unsigned long ival, int constraint, unsigned long *oval)
{
    int base = 1 + (int) log10(ival);

    (*oval) = ival;
    if (base > constraint) {
        (*oval) = (*oval) >> 10;
        return(1 + ByteReDim((*oval), constraint, oval));
    } else
        return(0);
}

现在,让我们转换12GB的RAM在几个单位:

int main(void)
{
    unsigned long RAM;
    int unit; // index of below symbols array
    char symbol[5] = {'B', 'K', 'M', 'G', 'T'};

    unit = ByteReDim(12884901888, 12, &RAM);
    printf("%lu%c\n", RAM, symbol[unit]); // output is 12884901888B

    unit = ByteReDim(12884901888, 9, &RAM);
    printf("%lu%c\n", RAM, symbol[unit]); // output is 12582912K

    unit = ByteReDim(12884901888, 6, &RAM);
    printf("%lu%c\n", RAM, symbol[unit]); // output is 12288M

    unit = ByteReDim(12884901888, 3, &RAM);
    printf("%lu%c\n", RAM, symbol[unit]); // output is 12G
}


Answer 18:

@ Servy的回答是不错的简洁。 我认为它可以更简单?

private static string[] suffixes = new [] { " B", " KB", " MB", " GB", " TB", " PB" };

public static string ToSize(double number, int precision = 2)
{
    // unit's number of bytes
    const double unit = 1024;
    // suffix counter
    int i = 0;
    // as long as we're bigger than a unit, keep going
    while(number > unit)
    {
        number /= unit;
        i++;
    }
    // apply precision and current suffix
    return Math.Round(number, precision) + suffixes[i];
}


Answer 19:

我用这个的Windows(二进制前缀):

static readonly string[] BinaryPrefix = { "bytes", "KB", "MB", "GB", "TB" }; // , "PB", "EB", "ZB", "YB"
string GetMemoryString(double bytes)
{
    int counter = 0;
    double value = bytes;
    string text = "";
    do
    {
        text = value.ToString("0.0") + " " + BinaryPrefix[counter];
        value /= 1024;
        counter++;
    }
    while (Math.Floor(value) > 0 && counter < BinaryPrefix.Length);
    return text;
}


文章来源: Does .NET provide an easy way convert bytes to KB, MB, GB, etc.?