C Double - ToString formatting with two decimal places but no rounding

Question

How do I format a Double to a String in C  so as to have only two decimal places    If I use String Format   0 0 00     myDoubleValue  the number is then rounded and I want a simple truncate without any rounding  I also want the conversion to String to be culture sensitive

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This is working for me  string prouctPrice   Convert ToDecimal String Format   0 0 00    Convert ToDecimal yourString    ToString

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Simplest method  use numeric format strings   double total    43 257  MessageBox Show total ToString  F

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I know this is a old thread but I ve just had to do this  While the other approaches here work  I wanted an easy way to be able to affect a lot of calls to string format  So adding the Math Truncate to all the calls to wasn t really a good option  Also as some of the formatting is stored in a database  it made it even worse   Thus  I made a custom format provider which would allow me to add truncation to the formatting string  eg   string format new FormatProvider      0 T    1 1299      1 12 string format new FormatProvider      0 T 3    1 12399      1 123 string format new FormatProvider      0 T 1 0 000 0   1000 9999      1 000 9   The implementation is pretty simple and is easily extendible to other requirements   public class FormatProvider   IFormatProvider  ICustomFormatter       public object GetFormat Type formatType                if  formatType    typeof  ICustomFormatter                         return this                    return null             public string Format string format  object arg  IFormatProvider formatProvider                if  arg    null    arg GetType      typeof  double                         try                               return HandleOtherFormats format  arg                             catch  FormatException e                                throw new FormatException string Format  The format of   0   is invalid    format                                     if  format StartsWith  T                          int dp   2              int idx   1              if  format Length  gt  1                                if  format 1                                                int closeIdx   format IndexOf                           if  closeIdx  gt  0                                                if  int TryParse format Substring 2  closeIdx - 2   out dp                                                         idx   closeIdx   1                                                                      else                                               throw new FormatException string Format  The format of   0   is invalid    format                                                                      double mult   Math Pow 10  dp               arg   Math Truncate  double arg   mult    mult              format   format Substring idx                      try                       return HandleOtherFormats format  arg                     catch  FormatException e                        throw new FormatException string Format  The format of   0   is invalid    format                         private string HandleOtherFormats string format  object arg                if  arg is IFormattable                        return   IFormattable  arg  ToString format  CultureInfo CurrentCulture                     return arg    null   arg ToString     String Empty

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The c  function  as expressed by Kyle Rozendo   string DecimalPlaceNoRounding double d  int decimalPlaces   2        d   d   Math Pow 10  decimalPlaces       d   Math Truncate d       d   d   Math Pow 10  decimalPlaces       return string Format   0 N    Math Abs decimalPlaces         d

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i use price ToString  0 00   for getting the leading 0s

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The following rounds the numbers  but only shows up to 2 decimal places  removing any trailing zeros   thanks to       decimal d0   24 154m  decimal d1   24 155m  decimal d2   24 1m  decimal d3   24 0m   d0 ToString  0           24 15 d1 ToString  0           24 16  rounded up  d2 ToString  0           24 1   d3 ToString  0           24   http   dobrzanski net 2009 05 14 c-decimaltostring-and-how-to-get-rid-of-trailing-zeros

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I suggest you truncate first  and then format   double a   123 4567  double aTruncated   Math Truncate a   100    100  CultureInfo ci   new CultureInfo  de-DE    string s   string Format ci    0 0 00     aTruncated     Use the constant 100 for 2 digits truncate  use a 1 followed by as many zeros as digits after the decimal point you would like  Use the culture name you need to adjust the formatting result

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Solution   var d   0 123345678   var stringD   d ToString     int indexOfP   stringD IndexOf        var result   stringD Remove  indexOfP 1  2         indexOfP 1  2 this number depend on how many number you want to   preserve  I give it two because the question owner want

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Following can be used for display only which uses the property of String     double value   123 456789  String Format   0 0 00    value

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Also note the CultureInformation of your system  Here my solution without rounding   In this example you just have to define the variable MyValue as double  As result you get your formatted value in the string variable NewValue   Note - Also set the C  using statement   using System Globalization     string MyFormat    0   if  MyValue ToString  CultureInfo InvariantCulture  Contains  CultureInfo InvariantCulture NumberFormat NumberDecimalSeparator              MyFormat      00         string NewValue   MyValue ToString MyFormat

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To what is worth  for showing currency  you can use  C    double cost   1 99  m CostText text   cost ToString  C      C  format as currentcy      Output   1 99

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I had that problem with Xamarin Forms and solved it with this   percent ToString  0

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You could also write your own IFormatProvider  though I suppose eventually you d have to think of a way to do the actual truncation      The  NET Framework also supports custom formatting  This typically involves the creation of a formatting class that implements both IFormatProvider and ICustomFormatter   msdn    At least it would be easily reusable   There is an article about how to implement your own IFormatProvider ICustomFormatter here at CodeProject  In this case   extending  an existing numeric format might be the best bet  It doesn t look too hard

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How about adding one extra decimal that is to be rounded and then discarded   var d   0 241534545765  var result1   d ToString  0          var result2   result1 Remove result1 Length - 1

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I use the following   double x   Math Truncate myDoubleValue   100    100    For instance   If the number is 50 947563 and you use the following  the following will happen   - Math Truncate 50 947563   100    100  - Math Truncate 5094 7563    100  - 5094   100 - 50 94   And there s your answer truncated  now to format the string simply do the following   string s   string Format   0 N2     x      No fear of rounding and takes the default number format

[c#] C# Double - ToString() formatting with two decimal places but no rounding

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