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Convert.ToInt64 Method (Double)

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

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

'Declaration
Public Shared Function ToInt64 ( _
	value As Double _
) As Long

Parameters

value
Type: System.Double
The double-precision floating-point number to convert.

Return Value

Type: System.Int64
value, rounded to the nearest 64-bit signed integer. If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

ExceptionCondition
OverflowException

value is greater than Int64.MaxValue or less than Int64.MinValue.

The following example attempts to convert each element in an array of Double values to a long integer.


Dim values() As Double = { Double.MinValue, -1.38e10, -1023.299, -12.98, _
                           0, 9.113e-16, 103.919, 17834.191, Double.MaxValue }
Dim result As Long

For Each value As Double In values
   Try
      result = Convert.ToInt64(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the Int64 type.", value)
   End Try   
Next                                 
'    -1.79769313486232E+308 is outside the range of the Int64 type.
'    -13800000000 is outside the range of the Int16 type.
'    Converted the Double value '-1023.299' to the Int64 value -1023.
'    Converted the Double value '-12.98' to the Int64 value -13.
'    Converted the Double value '0' to the Int64 value 0.
'    Converted the Double value '9.113E-16' to the Int64 value 0.
'    Converted the Double value '103.919' to the Int64 value 104.
'    Converted the Double value '17834.191' to the Int64 value 17834.
'    1.79769313486232E+308 is outside the range of the Int64 type.


.NET Framework

Supported in: 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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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