Convert.ToDouble Method (Int64)

Converts the value of the specified 64-bit signed integer to an equivalent double-precision floating-point number.

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

public static double ToDouble(
	long value
)

Parameters

value
Type: System.Int64

The 64-bit signed integer to convert.

Return Value

Type: System.Double
A double-precision floating-point number that is equivalent to value.

The following example converts each element in an array of signed long integers to a Double value.

long[] numbers = { Int64.MinValue, -903, 0, 172, Int64.MaxValue};
double result;

foreach (long number in numbers)
{
   result = Convert.ToDouble(number);
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", 
                     number.GetType().Name, number, 
                     result.GetType().Name, result);
}
// The example displays the following output: 
//    Converted the Int64 value '-9223372036854775808' to the Double value -9.22337203685478E+18. 
//    Converted the Int64 value '-903' to the Double value -903. 
//    Converted the Int64 value '0' to the Double value 0. 
//    Converted the Int64 value '172' to the Double value 172. 
//    Converted the Int64 value '9223372036854775807' to the Double value 9.22337203685478E+18.

.NET Framework

Supported in: 4.6, 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

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: 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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