Using String Format to show decimal up to 2 places or simple integer

Question

I have got a price field to display which sometimes can be either 100 or 100 99 or 100 9  What I want is to display the price in 2 decimal places only if the decimals are entered for that price   for instance if its 100 so it should only show 100 not 100 00 and if the price is 100 2 it should display 100 20 similarly for 100 22 should be same   I googled and came across some examples but they didn t match exactly what i wanted       just two decimal places String Format   0 0 00    123 4567            123 46  String Format   0 0 00    123 4               123 40  String Format   0 0 00    123 0               123 00

User · Answer

Try   String Format   0 0 00    Convert ToDecimal totalPrice

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This is a common formatting floating number use case   Unfortunately  all of the built-in one-letter format strings  eg  F  G  N  won t achieve this directly  For example  num ToString  F2   will always show 2 decimal places like 123 40   You ll have to use 0    pattern even it looks a little verbose   A complete code example   double a   123 4567  double b   123 40  double c   123 00   string sa   a ToString  0          123 46 string sb   b ToString  0          123 4 string sc   c ToString  0          123

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This worked for me   String amount   123 0000   String Format   0 0       amount            123 00

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A recent project has a similar requirement  I wrote this decimal extension method  which uses the currency   quot C quot   Format Specifier  In addition to removing zeros  it also has options for decimal digits precision  currency symbol  separator and culture  public static DecimalExtension        public static string ToCurrency this decimal val                                        int precision   2                                        bool currencySymbol   false                                        bool separator   false                                        CultureInfo culture   null                        if culture    null  culture   new CultureInfo  quot en-US quot                                                                 NumberFormatInfo nfi   culture NumberFormat           nfi CurrencyDecimalDigits   precision                        string zeros   new String  0   precision                                          Remove zeros          var result   val ToString  quot C quot  fi  Replace nfi CurrencyDecimalSeparator   zeros  quot  quot                                   if  separator  result   result Replace nfi CurrencyGroupSeparator  quot  quot                                  return currencySymbol  result  result Replace nfi CurrencySymbol  quot  quot                          Examples  decimal Total   123 00M  Console WriteLine Total ToCurrency         output  123  decimal Total   1123 12M  Console WriteLine Total ToCurrency        Output   1123 12  Console WriteLine Total ToCurrency 4      Output   1123 1200  Console WriteLine Total ToCurrency 2 true true      output    1 123 12   CultureInfo culture   new CultureInfo  quot pt-BR quot      Brazil Console WriteLine Total ToCurrency 2 true true  culture      output   R  1 123 12

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I am afraid there is no built-in format that will do this  You will have to use a different format depending on whether the value is a whole number or not  Or always format to 2 decimal places  and manipulate the string afterwards to remove any trailing   00

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Simple one line code    public static string DoFormat double myNumber        return string Format   0 0 00    myNumber  Replace   00

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Here is an alternative to Uwe Keim s method  which would still maintain the same method call   var example1   MyCustomFormat 123 1       Output  123 10 var example2   MyCustomFormat 123 95      Output  123 95 var example3   MyCustomFormat 123         Output  123   With MyCustomFormat being something like   public static string MyCustomFormat  double myNumber         var str  string Format   0 0 00    myNumber       return  str EndsWith   00     str Substring 0  strLastIndexOf   00      str

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I don t know of anyway to put a condition in the format specifier  but you can write your own formatter   using System  using System Collections Generic  using System Globalization  using System Linq  using System Text   namespace ConsoleApplication1       class Program               static void Main string   args                              all of these don t work             Console WriteLine   0 C    10               Console WriteLine   0 00 0    10               Console WriteLine   0 0    10               Console WriteLine   0 0 00    10               Console WriteLine   0 0    10 0               Console WriteLine   0 0    10 1               Console WriteLine   0 0 00    10 1                 works             Console WriteLine String Format new MyFormatter     0 custom    9                Console WriteLine String Format new MyFormatter     0 custom    9 1                Console ReadKey                         class MyFormatter   IFormatProvider  ICustomFormatter               public string Format string format  object arg  IFormatProvider formatProvider                        switch  format ToUpper                                  case  CUSTOM                       if  arg is short    arg is int    arg is long                          return arg ToString                        if  arg is Single    arg is Double                          return String Format   0 0 00   arg                       break                     Handle other                 default                      try                                               return HandleOtherFormats format  arg                                             catch  FormatException e                                                throw new FormatException String Format  The format of   0   is invalid    format   e                                                   return arg ToString       only as a last resort                    private string HandleOtherFormats string format  object arg                        if  arg is IFormattable                  return   IFormattable arg  ToString format  CultureInfo CurrentCulture               if  arg    null                  return arg ToString                return String Empty                     public object GetFormat Type formatType                        if  formatType    typeof ICustomFormatter                   return this              return null

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When dealing with decimals coming from a  T- SQL database  you want to be able to convert nullable and non-nullable decimals with x decimal places and be able to review the code easily against your table definitions - and of course  display the right number of decimals to the user    Unfortunately  the Entity Framework doesn t automatically convert something like a SQL decimal 18 2  into a  NET equivalent with the same number of decimal places  since there is only decimal with full precision available   You have to truncate the decimal places manually   So  I did it this way   public static class Extensions       public static string ToStringDecimal this decimal d  byte decimals                var fmt    decimals gt 0     0     new string  0   decimals     0           return d ToString fmt              public static string ToStringDecimal this decimal  d  byte decimals                if   d HasValue  return             return ToStringDecimal d Value  decimals             Example Usage   void Main         decimal d    decimal 1 2345      decimal  d2   null        Console WriteLine d ToStringDecinal 2       prints   1 23   2 decimal places      Console WriteLine d ToStringDecinal 0       prints   1   show integer number      Console WriteLine d2 ToStringDecimal 2       prints      show null as empty string

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Sorry for reactivating this question  but I didn t find the right answer here  In formatting numbers you can use 0 as a mandatory place and   as an optional place  So     just two decimal places String Format  quot  0 0     quot   123 4567            quot 123 46 quot  String Format  quot  0 0     quot   123 4               quot 123 4 quot  String Format  quot  0 0     quot   123 0               quot 123 quot   You can also combine 0 with    String Format  quot  0 0 0   quot   123 4567            quot 123 46 quot  String Format  quot  0 0 0   quot   123 4               quot 123 4 quot  String Format  quot  0 0 0   quot   123 0               quot 123 0 quot   For this formating method is always used CurrentCulture  For some Cultures   will be changed to    Answer to original question  The simpliest solution comes from  Andrew  here   So I personally would use something like this  var number   123 46  String Format number   1    0    quot  0 0  quot     quot  0 0 00  quot   number

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try  double myPrice   123 0   String Format   Math Round myPrice     myPrice      0 0       0 0 00     myPrice

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If none of the other answers work for you  it may be because you are binding the ContentProperty of a control in the OnLoad function  which means this won t work   private void UserControl Load object sender  RoutedEventArgs e      Bind SetBindingElement labelName  String Format   0 0 00    PropertyName   Label ContentProperty       The solution is simple  there is a ContentStringFormat property in the xaml  So when you create the label do this     if you want the decimal places definite  lt Label Content  0  Name  labelName  ContentStringFormat  0 00   gt    Or    if you want the decimal places to be optional  lt Label Content  0  Name  labelName  ContentStringFormat  0      gt

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To make the code more clear that Kahia wrote in  it is clear but gets tricky when you want to add more text to it    try this simple solution   if  Math Round  decimal user CurrentPoints     user CurrentPoints       ViewBag MyCurrentPoints   String Format  Your current Points   0 0   user CurrentPoints   else      ViewBag MyCurrentPoints   String Format  Your current Points   0 0 0   user CurrentPoints     I had to add the extra cast  decimal  to have Math Round compare the two decimal variables

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If your program needs to run quickly  call value ToString formatString  for  35  faster string formatting performance relative to    value formatString   and string Format formatString  value    Data    Code  using System  using System Diagnostics   public static class StringFormattingPerformance      public static void Main              Console WriteLine  C  String Formatting Performance          Console WriteLine  Milliseconds Per 1 Million Iterations - Best Of 5          long stringInterpolationBestOf5   Measure1MillionIterationsBestOf5             double randomDouble    gt                           return    randomDouble 0                           long stringDotFormatBestOf5   Measure1MillionIterationsBestOf5             double randomDouble    gt                           return string Format   0 0       randomDouble                       long valueDotToStringBestOf5   Measure1MillionIterationsBestOf5             double randomDouble    gt                           return randomDouble ToString  0                           Console WriteLine                      value formatString       stringInterpolationBestOf5  ms  string Format formatString  value    stringDotFormatBestOf5  ms        value ToString formatString    valueDotToStringBestOf5  ms             private static long Measure1MillionIterationsBestOf5         Func lt double  string gt  formatDoubleUpToTwoDecimalPlaces             long elapsedMillisecondsBestOf5   long MaxValue        for  int perfRunIndex   0  perfRunIndex  lt  5    perfRunIndex                   var random   new Random             var stopwatch   Stopwatch StartNew             for  int i   0  i  lt  1000000    i                         double randomDouble   random NextDouble                formatDoubleUpToTwoDecimalPlaces randomDouble                       stopwatch Stop             elapsedMillisecondsBestOf5   Math Min              elapsedMillisecondsBestOf5  stopwatch ElapsedMilliseconds                 return elapsedMillisecondsBestOf5           Code Output  C  String Formatting Performance Milliseconds Per 1 Million Iterations - Best Of 5                value formatString    419 ms  string Format formatString  value   419 ms        value ToString formatString   264 ms   References  Custom Numeric Format Strings  docs microsoft com   Qt Charts BarChart Example  doc qt io

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something like this will work too    String Format   0 P    decimal Parse Resellers Fee   Replace   00

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Old question but I wanted to add the simplest option in my opinion   Without thousands separators   value ToString value   1    0    F0     F2     With thousands separators   value ToString value   1    0    N0     N2     The same but with String Format   String Format value   1    0     0 F0       0 F2    value     Without thousands separators String Format value   1    0     0 N0       0 N2    value     With thousands separators   If you need it in many places  I would use this logic in an extension method   public static string ToCoolString this decimal value        return value ToString value   1    0    N0     N2       Or F0 F2

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An inelegant way would be   var my   DoFormat 123 0     With DoFormat being something like   public static string DoFormat  double myNumber         var s   string Format   0 0 00    myNumber        if   s EndsWith  00                   return   int myNumber  ToString              else               return s            Not elegant but working for me in similar situations in some projects

[c#] Using String Format to show decimal up to 2 places or simple integer

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