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SO C＃で数値をフォーマットする方法は？

10、5k、.。

c#.netnumber-formatting
31
Yoann. B

このように：（[〜＃〜] edit [〜＃〜]：テスト済み）

static string FormatNumber(int num) {
    if (num >= 100000)
        return FormatNumber(num / 1000) + "K";
    if (num >= 10000) {
        return (num / 1000D).ToString("0.#") + "K";
    }
    return num.ToString("#,0");
}

例：

  • 1 => 1
  • 23 => 23
  • 136 => 136
  • 6968 => 6,968
  • 23067 => 23.1K
  • 133031 => 133K

これにより、10以上の数値に奇妙な値が与えられることに注意してください8。
たとえば、12345678は12.3KKになります。

30
SLaks

以下のコードはint.MaxValueまでテストされています。これは最も美しいコードではありませんが、最も効率的です。ただし、次のように使用できます。

123.KiloFormat（）; 4332.KiloFormat（）; 2332124.KiloFormat（）; int.MaxValue.KiloFormat（）; （int1-int2 * int3）.KiloFormat（）;

等...

public static class Extensions
{
    public static string KiloFormat(this int num)
    {
        if (num >= 100000000)
            return (num / 1000000).ToString("#,0M");

        if (num >= 10000000)
            return (num / 1000000).ToString("0.#") + "M";

        if (num >= 100000)
            return (num / 1000).ToString("#,0K");

        if (num >= 10000)
            return (num / 1000).ToString("0.#") + "K";

        return num.ToString("#,0");
    } 
}
20
please delete me

次のようにCustomFormaterを作成できます。

public class KiloFormatter: ICustomFormatter, IFormatProvider
{
    public object GetFormat(Type formatType)
    {
        return (formatType == typeof(ICustomFormatter)) ? this : null;
    }

    public string Format(string format, object arg, IFormatProvider formatProvider)
    {
        if (format == null || !format.Trim().StartsWith("K")) {
            if (arg is IFormattable) {
                return ((IFormattable)arg).ToString(format, formatProvider);
            }
            return arg.ToString();
        }

        decimal value = Convert.ToDecimal(arg);

        //  Here's is where you format your number

        if (value > 1000) {
            return (value / 1000).ToString() + "k";
        }

        return value.ToString();
    }
}

そして、次のように使用します。

String.Format(new KiloFormatter(), "{0:K}", 15600);

編集：CurrencyFormatterの名前をKiloFormatterに変更

17
Alex LE

完全な情報を提供するためにいくつか書いた

public static class SIPrefix
{
    private static List<SIPrefixInfo> _SIPrefixInfoList = new
        List<SIPrefixInfo>();

    static SIPrefix()
    {
        _SIPrefixInfoList = new List<SIPrefixInfo>();
        LoadSIPrefix();
    }

    public static List<SIPrefixInfo> SIPrefixInfoList
    { 
        get 
        { 
            SIPrefixInfo[] siPrefixInfoList = new SIPrefixInfo[6];
            _SIPrefixInfoList.CopyTo(siPrefixInfoList);
            return siPrefixInfoList.ToList();
        }
    }

    private static void LoadSIPrefix()
    {
        _SIPrefixInfoList.AddRange(new SIPrefixInfo[]{
            new SIPrefixInfo() {Symbol = "Y", Prefix = "Yotta", Example = 1000000000000000000000000.00M, ZeroLength = 24, ShortScaleName = "Septillion", LongScaleName = "Quadrillion"},
            new SIPrefixInfo() {Symbol = "Z", Prefix = "zetta", Example = 1000000000000000000000M, ZeroLength = 21, ShortScaleName = "Sextillion", LongScaleName = "Trilliard"},
            new SIPrefixInfo() {Symbol = "E", Prefix = "exa", Example = 1000000000000000000M, ZeroLength = 18, ShortScaleName = "Quintillion", LongScaleName = "Trillion"},
            new SIPrefixInfo() {Symbol = "P", Prefix = "peta", Example = 1000000000000000M, ZeroLength = 15, ShortScaleName = "Quadrillion", LongScaleName = "Billiard"},
            new SIPrefixInfo() {Symbol = "T", Prefix = "tera", Example = 1000000000000M, ZeroLength = 12, ShortScaleName = "Trillion", LongScaleName = "Billion"},
            new SIPrefixInfo() {Symbol = "G", Prefix = "giga", Example = 1000000000M, ZeroLength = 9, ShortScaleName = "Billion", LongScaleName = "Milliard"},
            new SIPrefixInfo() {Symbol = "M", Prefix = "mega", Example = 1000000M, ZeroLength = 6, ShortScaleName = "Million", LongScaleName = "Million"},
            new SIPrefixInfo() {Symbol = "K", Prefix = "kilo", Example = 1000M, ZeroLength = 3, ShortScaleName = "Thousand", LongScaleName = "Thousand"},
            new SIPrefixInfo() {Symbol = "h", Prefix = "hecto", Example = 100M, ZeroLength = 2, ShortScaleName = "Hundred", LongScaleName = "Hundred"},
            new SIPrefixInfo() {Symbol = "da", Prefix = "deca", Example = 10M, ZeroLength = 1, ShortScaleName = "Ten", LongScaleName = "Ten"},
            new SIPrefixInfo() {Symbol = "", Prefix = "", Example = 1M, ZeroLength = 0, ShortScaleName = "One", LongScaleName = "One"},
        });
    }

    public static SIPrefixInfo GetInfo(long amount, int decimals)
    {
        return GetInfo(Convert.ToDecimal(amount), decimals);
    }

    public static SIPrefixInfo GetInfo(decimal amount, int decimals)
    {
        SIPrefixInfo siPrefixInfo = null;
        decimal amountToTest = Math.Abs(amount);

        var amountLength = amountToTest.ToString("0").Length;
        if(amountLength < 3)
        {
            siPrefixInfo = _SIPrefixInfoList.Find(i => i.ZeroLength == amountLength).Clone() as SIPrefixInfo;
            siPrefixInfo.AmountWithPrefix =  Math.Round(amount, decimals).ToString();

            return siPrefixInfo;
        }

        siPrefixInfo = _SIPrefixInfoList.Find(i => amountToTest > i.Example).Clone() as SIPrefixInfo;

        siPrefixInfo.AmountWithPrefix = Math.Round(
            amountToTest / Convert.ToDecimal(siPrefixInfo.Example), decimals).ToString()
                                        + siPrefixInfo.Symbol;

        return siPrefixInfo;
    }
}

public class SIPrefixInfo : ICloneable
{
    public string Symbol { get; set; }
    public decimal Example { get; set; }
    public string Prefix { get; set; }
    public int ZeroLength { get; set; }
    public string ShortScaleName { get; set; }
    public string LongScaleName { get; set; }
    public string AmountWithPrefix { get; set; }

    public object Clone()
    {
        return new SIPrefixInfo()
                            {
                                Example = this.Example,
                                LongScaleName = this.LongScaleName,
                                ShortScaleName = this.ShortScaleName,
                                Symbol = this.Symbol,
                                Prefix = this.Prefix,
                                ZeroLength = this.ZeroLength
                            };

    }
}

使用する：

var amountInfo = SIPrefix.GetInfo(10250, 2);
var amountInfo2 = SIPrefix.GetInfo(2500000, 0);

amountInfo.AmountWithPrefix // 10.25K
amountInfo2.AmountWithPrefix // 2M
11
Cruiser KID

SLaksコード のわずかに変更されたバージョン

static string FormatNumber(long num)
{
    if (num >= 100000000) {
        return (num / 1000000D).ToString("0.#M");
    }
    if (num >= 1000000) {
        return (num / 1000000D).ToString("0.##M");
    }
    if (num >= 100000) {
        return (num / 1000D).ToString("0.#k");
    }
    if (num >= 10000) {
        return (num / 1000D).ToString("0.##k");
    }

    return num.ToString("#,0");
}

これにより、次の値が返されます。

 123        ->  123
 1234       ->  1,234
 12345      ->  12.35k
 123456     ->  123.4k
 1234567    ->  1.23M
 12345678   ->  12.35M
 123456789  ->  123.5M
9
hex

longの数値を縮小するためにこのメソッドを作成しました。

public string minifyLong(long value)
    {
        if (value >= 100000000000)
            return (value / 1000000000).ToString("#,0") + " B";
        if (value >= 10000000000)
            return (value / 1000000000D).ToString("0.#") + " B";
        if (value >= 100000000)
            return (value / 1000000).ToString("#,0") + " M";
        if (value >= 10000000)
            return (value / 1000000D).ToString("0.#") + " M";
        if (value >= 100000)
            return (value / 1000).ToString("#,0") + " K";
        if (value >= 10000)
            return (value / 1000D).ToString("0.#") + " K";
        return value.ToString("#,0"); 
    }
2
Majid

これは非常に古いスレッドであることは知っていますが、もっと一般的な答えが役立つと思います。

追加：C＃である必要があることを見逃したため、ここで翻訳します。

    //--Formats the number after scaling by factors of 1000, and appends a metric unit prefix (e.g. M for *1000000)
    //--Mask, Prov are the standard ToString() parameters (after metric scaling has been performed)
    //--MinPow10 (/Max) should be multipla of 3 and a usually a negative (/Positve) number or zero, if say +9 is used, all is in G or above (/below)
    //--SwitchLimit usualy 1, but could be say 10 or 100 with few/zero decimals, The limit at which to switch prefix, if say 33 then 33000000->33M but 32900000->32900K
    static string FormatMetricPrefix(double Input, String Mask ="F2", IFormatProvider Prov=null, int MinPow10 =-24, int MaxPow10 =24, int SwitchLimit =1) {
        string Prefixes ="yzafpnμm KMGTPEZY";
        int idx=9;
        double tmp=Input;
        if (Input!=0.0) {
            if (+24<MaxPow10)MaxPow10=+24;
            if (MinPow10<-24)MaxPow10=-24;
            idx=(int)Math.Truncate(9.0+Math.Log(Math.Abs(Input/SwitchLimit))/Math.Log(1000.0));
            if (idx<9+(MinPow10/3)) idx=9+(MinPow10/3); // below lower limit
            if (9+(MaxPow10/3)<idx) idx=9+(MaxPow10/3); // Above upper limit
            if (idx<=9)tmp *=Math.Pow(1000.0,9-idx);
            if (9<idx) tmp /=Math.Pow(1000.0,idx-9);
        }
        if (Prov==null)Prov=CultureInfo.InvariantCulture;
        return tmp.ToString(Mask,Prov)+Prefixes.Substring(idx-1,1).Trim();
    }

    static string FormatMetricPrefixF2DK(double Input){return FormatMetricPrefix(Input, Prov:CultureInfo.GetCultureInfo("da-DK"));}
    static string FormatMetricPrefixF2US(double Input){return FormatMetricPrefix(Input, Prov:CultureInfo.GetCultureInfo("en-US"));}
    static string FormatMetricPrefixF0DK(double Input){return FormatMetricPrefix(Input, Mask:"F0", MinPow10:0, Prov:CultureInfo.GetCultureInfo("da-DK"),SwitchLimit:100);}
    static string FormatMetricPrefixF0US(double Input){return FormatMetricPrefix(Input, Mask:"F0", MinPow10:0, Prov:CultureInfo.GetCultureInfo("en-US"),SwitchLimit:100);}
    static void Main(string[] args)
    {
        Console.WriteLine(FormatMetricPrefixF2US(1.234567890E+27));
        Console.WriteLine(FormatMetricPrefixF2US(1234567890));
        Console.WriteLine(FormatMetricPrefixF2US(0.01234567890));
        Console.WriteLine(FormatMetricPrefixF2US(0.00000001234567890));
        Console.WriteLine(FormatMetricPrefixF2US(1.234567890E-26));
        Console.WriteLine(FormatMetricPrefixF0US(0.5));
        Console.WriteLine(FormatMetricPrefixF0US(2));
        Console.WriteLine(FormatMetricPrefixF0US(20000));
        Console.WriteLine(FormatMetricPrefixF0US(87654321));

    }

そしてこれはSQL用です：

--Formats the number after scaling by factors of 1000, and appends a metric unit prefix (e.g. M for *1000000)
--@Mask, @Cult are the standard FORMAT parameters (after metric scaling has been performed)
--@MinPow10 (/Max) should be multipla of 3 and a usually a negative (/Positve) number or zero, if say +9 is used, all is in G or above (/below)
--@SwitchLimit usualy 1, but could be say 10 or 100 with few/zero decimals, The limit at which to switch prefix, if say 33 then 33000000->33M but 32900000->32900K
CREATE function FormatMetricPrefix(@Input float, @Mask Varchar(22)='F2', @Cult Varchar(9)='en-us', @MinPow10 int =-24, @MaxPow10 int =24, @SwitchLimit int=1) returns Varchar(99) as
Begin
  Declare @Prefixes Varchar(17)='yzafpnμm KMGTPEZY'
  Declare @idx int = 9
  Declare @tmp float=@input
  if @Input<>0.0
  begin
    if +24<@MaxPow10 set @MaxPow10=+24 --highest limit is y 10^24
    if @MinPow10<-24 set @MinPow10=-24 --lowest limit is y 10^-24
    set @idx=9.0+Log(Abs(@input/@SwitchLimit))/Log(1000)
    If @idx<9+(@MinPow10/3) set @idx=9+(@MinPow10/3) -- below lower limit
    If 9+(@MaxPow10/3)<@idx set @idx=9+(@MaxPow10/3) --above upper limit
    if @idx<=9set @tmp=@tmp*POWER(1000.0,9-@idx)
    if 9<@idx set @tmp=@tmp/POWER(1000.0,@idx-9)
  end
  Return FORMAT(@tmp,@mask,@Cult)+LTrim(Substring(@Prefixes,@idx,1))
end
GO

そして、おそらく、使用を容易にするためのいくつかの関連するラッパー関数。

CREATE function FormatMetricPrefixF2US(@Input float) returns Varchar(99) as
begin
    return dbo.FormatMetricPrefix(@Input, default,default,default,default,default)
end
GO
CREATE function FormatMetricPrefixF0US(@Input float) returns Varchar(99) as
begin
    return dbo.FormatMetricPrefix(@Input,  'F0'  ,default,   0   ,default,  100  )
end
GO

そして、たくさんのテスト/例：

      Select  0, dbo.FormatMetricPrefixF2US(1.234567890E+27)+'g'
union Select  1, dbo.FormatMetricPrefixF2US(1234567890)+'g'
union Select  2, dbo.FormatMetricPrefixF2US(123456789.0)+'g'
union Select  3, dbo.FormatMetricPrefixF2US(12345678.90)+'g'
union Select  4, dbo.FormatMetricPrefixF2US(1234567.890)+'g'
union Select  5, dbo.FormatMetricPrefixF2US(123456.7890)+'g'
union Select  6, dbo.FormatMetricPrefixF2US(12345.67890)+'g'
union Select  7, dbo.FormatMetricPrefixF2US(1234.567890)+'g'
union Select  8, dbo.FormatMetricPrefixF2US(123.4567890)+'g'
union Select  9, dbo.FormatMetricPrefixF2US(12.34567890)+'g'
union Select 10, dbo.FormatMetricPrefixF2US(1.234567890)+'g'
union Select 11, dbo.FormatMetricPrefixF2US(0.1234567890)+'g'
union Select 12, dbo.FormatMetricPrefixF2US(0.01234567890)+'g'
union Select 13, dbo.FormatMetricPrefixF2US(0.001234567890)+'g'
union Select 14, dbo.FormatMetricPrefixF2US(0.0001234567890)+'g'
union Select 15, dbo.FormatMetricPrefixF2US(0.00001234567890)+'g'
union Select 16, dbo.FormatMetricPrefixF2US(0.000001234567890)+'g'
union Select 17, dbo.FormatMetricPrefixF2US(0.0000001234567890)+'g'
union Select 18, dbo.FormatMetricPrefixF2US(0.00000001234567890)+'g'
union Select 19, dbo.FormatMetricPrefixF2US(1.234567890E-26)+'g'
union Select 20, dbo.FormatMetricPrefixF0US(0.5)
union Select 20, dbo.FormatMetricPrefixF0US(2)
union Select 21, dbo.FormatMetricPrefixF0US(20000)
union Select 22, dbo.FormatMetricPrefixF0US(87654321)
1
Eske Rahn

私は少し遅れていますが、これを思いついた：

`private static List<Tuple<int, string>> ZeroesAndLetters = new List<Tuple<int, string>>()
{
    new Tuple<int, string>(15, "Q"),
    new Tuple<int, string>(12, "T"),
    new Tuple<int, string>(9, "B"),
    new Tuple<int, string>(6, "M"),
    new Tuple<int, string>(3, "K"),
};

public static string GetPointsShortened(ulong num)
{
    int zeroCount = num.ToString().Length;
    for (int i = 0; i < ZeroesAndLetters.Count; i++)
        if (zeroCount >= ZeroesAndLetters[i].Item1)
            return (num / Math.Pow(10, ZeroesAndLetters[i].Item1)).ToString() + ZeroesAndLetters[i].Item2;
    return num.ToString();
}`

ZeroesAndLettersリストに、必要な数を追加するだけです。

15、12、9および...はゼロの数であり、Q、T、Bおよび...は短縮名です。

0
A.Tikadze

このようなもの：

string formatted;
if (num >= 1000) {
    formatted = ((double)num / 1000.0).ToString("N1") + "k";
} else {
    formatted = num.ToString("N0");
}
0
Guffa

数値がしきい値よりも大きい場合は、1000で除算してから、必要な小数点以下の桁数にフォーマットします。

int input = 12392; // for example

if (input >= 10000)
{
    double thousands = input/1000.0;
    Console.WriteLine(string.Format("{0}K", thousands));
}
0
Daniel Earwicker
public static class NumberDisplayHelper
{
    public static string KiloFormat(this decimal number)
    {
        return number >= 1000
            ? $"{(number / 1000):0.##}K"
            : number.ToString(CultureInfo.CurrentCulture);
    }

    public static string KiloFormat(this int number)
    {
        return number >= 1000
            ? $"{((decimal)number / 1000):0.##}K"
            : number.ToString();
    }
}

[Test()]
public void KiloFormatter()
{
    Assert.AreEqual("900", 900m.KiloFormat());
    Assert.AreEqual("1,2K", 1203m.KiloFormat());
    Assert.AreEqual("1,59K", 1588.84m.KiloFormat());
    Assert.AreEqual("1,52K", 1522.84m.KiloFormat());
    Assert.AreEqual("589", 589.KiloFormat());
    Assert.AreEqual("1K", 1001.KiloFormat());
    Assert.AreEqual("1,46K", 1455.KiloFormat());
    Assert.AreEqual("1K", 1000m.KiloFormat());
}
0
xleon