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Convert.ToString Method (Int32, Int32)

Converts the value of a 32-bit signed integer to its equivalent string representation in a specified base.

Namespace:  System
Assemblies:   System.Runtime.Extensions (in System.Runtime.Extensions.dll)
  mscorlib (in mscorlib.dll)

public static string ToString(
	int value,
	int toBase
)

Parameters

value
Type: System.Int32

The 32-bit signed integer to convert.

toBase
Type: System.Int32

The base of the return value, which must be 2, 8, 10, or 16.

Return Value

Type: System.String
The string representation of value in base toBase.

ExceptionCondition
ArgumentException

toBase is not 2, 8, 10, or 16.

If value is positive and toBase is 2, 8, or 16, the returned string uses sign-and-magnitude representation. If value is negative and toBase is 2, 8, or 16, the returned string uses two's complement representation. This means that the high-order bit of the highest-order byte (bit 31) is interpreted as the sign bit. If the ToString(Int32, Int32) method is called to create a string that will later be converted back to a number, a corresponding method that assumes a similar numeric representation should be called to perform the conversion. Such methods include Convert.ToInt32(String, Int32) and Int32.Parse(String, NumberStyles).

The following example converts each element in an integer array to its equivalent binary, hexadecimal, decimal, and hexadecimal string representations.

int[] bases = { 2, 8, 10, 16};
int[] numbers = { Int32.MinValue, -19327543, -13621, -18, 12, 
                             19142, Int32.MaxValue };

foreach (int baseValue in bases)
{
   Console.WriteLine("Base {0} conversion:", baseValue);
   foreach (int number in numbers)
   {
      Console.WriteLine("   {0,-15}  -->  0x{1}", 
                        number, Convert.ToString(number, baseValue));
   }
}
// The example displays the following output: 
//    Base 2 conversion: 
//       -2147483648      -->  0x10000000000000000000000000000000 
//       -19327543        -->  0x11111110110110010001010111001001 
//       -13621           -->  0x11111111111111111100101011001011 
//       -18              -->  0x11111111111111111111111111101110 
//       12               -->  0x1100 
//       19142            -->  0x100101011000110 
//       2147483647       -->  0x1111111111111111111111111111111 
//    Base 8 conversion: 
//       -2147483648      -->  0x20000000000 
//       -19327543        -->  0x37666212711 
//       -13621           -->  0x37777745313 
//       -18              -->  0x37777777756 
//       12               -->  0x14 
//       19142            -->  0x45306 
//       2147483647       -->  0x17777777777 
//    Base 10 conversion: 
//       -2147483648      -->  0x-2147483648 
//       -19327543        -->  0x-19327543 
//       -13621           -->  0x-13621 
//       -18              -->  0x-18 
//       12               -->  0x12 
//       19142            -->  0x19142 
//       2147483647       -->  0x2147483647 
//    Base 16 conversion: 
//       -2147483648      -->  0x80000000 
//       -19327543        -->  0xfed915c9 
//       -13621           -->  0xffffcacb 
//       -18              -->  0xffffffee 
//       12               -->  0xc 
//       19142            -->  0x4ac6 
//       2147483647       -->  0x7fffffff       

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

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

Portable Class Library

Supported in: Portable Class Library
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