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NumberFormatInfo.NumberGroupSizes Property

Gets or sets the number of digits in each group to the left of the decimal in numeric values.

Namespace:  System.Globalization
Assembly:  mscorlib (in mscorlib.dll)

public int[] NumberGroupSizes { get; set; }

Property Value

Type: System.Int32[]
The number of digits in each group to the left of the decimal in numeric values. The default for InvariantInfo is a one-dimensional array with only one element, which is set to 3.

ExceptionCondition
ArgumentNullException

The property is being set to null.

ArgumentException

The property is being set and the array contains an entry that is less than 0 or greater than 9.

-or-

The property is being set and the array contains an entry, other than the last entry, that is set to 0.

InvalidOperationException

The property is being set and the NumberFormatInfo object is read-only.

The value of the NumberGroupSizes property affects the result of number values that are formatted by using the "N" standard numeric format string. If a custom numeric format string or other standard numeric format strings are used, the value of the NumberGroupSizes property is ignored.

Every element in the one-dimensional array must be an integer from 1 through 9. The last element can be 0.

The first element of the array defines the number of elements in the least significant group of digits immediately to the left of the NumberDecimalSeparator. Each subsequent element refers to the next significant group of digits to the left of the previous group. If the last element of the array is not 0, the remaining digits are grouped based on the last element of the array. If the last element is 0, the remaining digits are not grouped.

For example, if the array contains { 3, 4, 5 }, the digits are grouped similar to "55,55555,55555,55555,4444,333.00". If the array contains { 3, 4, 0 }, the digits are grouped similar to "55555555555555555,4444,333.00".

The following example demonstrates the effect of changing the NumberGroupSizes property.

using System;
using System.Globalization;

class NumberFormatInfoSample {

   public static void Main() {

      // Gets a NumberFormatInfo associated with the en-US culture.
      NumberFormatInfo nfi = new CultureInfo( "en-US", false ).NumberFormat;

      // Displays a value with the default separator (".").
      Int64 myInt = 123456789012345;
      Console.WriteLine( myInt.ToString( "N", nfi ) );

      // Displays the same value with different groupings. 
      int[] mySizes1 = {2,3,4};
      int[] mySizes2 = {2,3,0};
      nfi.NumberGroupSizes = mySizes1;
      Console.WriteLine( myInt.ToString( "N", nfi ) );
      nfi.NumberGroupSizes = mySizes2;
      Console.WriteLine( myInt.ToString( "N", nfi ) );

   }
}


/* 
This code produces the following output.

123,456,789,012,345.00
12,3456,7890,123,45.00
1234567890,123,45.00
*/
   

The following example prints a value using different NumberGroupSizes arrays.

using System;
using System.Globalization;
class SamplesNumberFormatInfo  {

   public static void Main()  {

      // Creates a new NumberFormatinfo.
      NumberFormatInfo myNfi = new NumberFormatInfo();

      // Takes a long value.
      Int64 myInt = 123456789012345;

      // Displays the value with default formatting.
      Console.WriteLine( "Default  \t\t:\t{0}", myInt.ToString( "N", myNfi ) );

      // Displays the value with three elements in the GroupSize array.
      myNfi.NumberGroupSizes = new int[]  { 2, 3, 4 };
      Console.WriteLine( "Grouping ( {0} )\t:\t{1}",
         PrintArraySet( myNfi.NumberGroupSizes ), myInt.ToString( "N", myNfi ) );

      // Displays the value with zero as the last element in the GroupSize array.
      myNfi.NumberGroupSizes = new int[]  { 2, 4, 0 };
      Console.WriteLine( "Grouping ( {0} )\t:\t{1}",
         PrintArraySet( myNfi.NumberGroupSizes ), myInt.ToString( "N", myNfi ) );
   }

   public static string PrintArraySet( int[] myArr )  {
      string myStr = null;
      myStr = myArr[0].ToString();
      for ( int i = 1; i < myArr.Length; i++ )
         myStr += ", " + myArr[i].ToString();
      return( myStr );
   }
}
/*
This code produces the following output. 

Default                 :       123,456,789,012,345.00
Grouping ( 2, 3, 4 )    :       12,3456,7890,123,45.00
Grouping ( 2, 4, 0 )    :       123456789,0123,45.00
*/

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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