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Convert.ToString Method (Int64, Int32)

Converts the value of a 64-bit signed integer to its equivalent string representation in a specified base.

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

public static string ToString(
	long value,
	int toBase
)

Parameters

value
Type: System.Int64

The 64-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 not 10, the returned string uses sign-and-magnitude representation. If value is negative and toBase is not 10, the returned string uses two's complement representation. This means that the high-order bit of the highest-order byte (bit 63) is interpreted as the sign bit. If the ToString(Int64, 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.ToInt64(String, Int32) and Int64.Parse(String, NumberStyles).

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

int[] bases = { 2, 8, 10, 16};
long[] numbers = { Int64.MinValue, -193275430, -13621, -18, 12, 
                   1914206117, Int64.MaxValue };

foreach (int baseValue in bases)
{
   Console.WriteLine("Base {0} conversion:", baseValue);
   foreach (long number in numbers)
   {
      Console.WriteLine("   {0,-23}  -->  0x{1}", 
                        number, Convert.ToString(number, baseValue));
   }
}
// The example displays the following output: 
//    Base 2 conversion: 
//       -9223372036854775808     -->  0x1000000000000000000000000000000000000000000000000000000000000000 
//       -193275430               -->  0x1111111111111111111111111111111111110100011110101101100111011010 
//       -13621                   -->  0x1111111111111111111111111111111111111111111111111100101011001011 
//       -18                      -->  0x1111111111111111111111111111111111111111111111111111111111101110 
//       12                       -->  0x1100 
//       1914206117               -->  0x1110010000110000111011110100101 
//       9223372036854775807      -->  0x111111111111111111111111111111111111111111111111111111111111111 
//    Base 8 conversion: 
//       -9223372036854775808     -->  0x1000000000000000000000 
//       -193275430               -->  0x1777777777776436554732 
//       -13621                   -->  0x1777777777777777745313 
//       -18                      -->  0x1777777777777777777756 
//       12                       -->  0x14 
//       1914206117               -->  0x16206073645 
//       9223372036854775807      -->  0x777777777777777777777 
//    Base 10 conversion: 
//       -9223372036854775808     -->  0x-9223372036854775808 
//       -193275430               -->  0x-193275430 
//       -13621                   -->  0x-13621 
//       -18                      -->  0x-18 
//       12                       -->  0x12 
//       1914206117               -->  0x1914206117 
//       9223372036854775807      -->  0x9223372036854775807 
//    Base 16 conversion: 
//       -9223372036854775808     -->  0x8000000000000000 
//       -193275430               -->  0xfffffffff47ad9da 
//       -13621                   -->  0xffffffffffffcacb 
//       -18                      -->  0xffffffffffffffee 
//       12                       -->  0xc 
//       1914206117               -->  0x721877a5 
//       9223372036854775807      -->  0x7fffffffffffffff

.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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