Convert.ToInt64 Method (UInt64)


Converts the value of the specified 64-bit unsigned integer to an equivalent 64-bit signed integer.

This API is not CLS-compliant.

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

Public Shared Function ToInt64 (
	value As ULong
) As Long


Type: System.UInt64

The 64-bit unsigned integer to convert.

Return Value

Type: System.Int64

A 64-bit signed integer that is equivalent to value.

Exception Condition

value is greater than Int64.MaxValue.

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

Dim numbers() As ULong = { UInt64.MinValue, 121, 340, UInt64.MaxValue }
Dim result As Long

For Each number As ULong In numbers
      result = Convert.ToInt64(number)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", _
                        number.GetType().Name, number)
   End Try
' The example displays the following output:
'    Converted the UInt64 value 0 to the Int64 value 0.
'    Converted the UInt64 value 121 to the Int64 value 121.
'    Converted the UInt64 value 340 to the Int64 value 340.
'    The UInt64 value 18446744073709551615 is outside the range of the Int64 type.

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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