Convert.ToInt64 Method (Double)
.NET Framework (current version)
Converts the value of the specified double-precision floating-point number to an equivalent 64-bit signed integer.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
-
Type:
System.Double
The double-precision floating-point number to convert.
Return Value
Type: System.Int64value, 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.
| Exception | Condition |
|---|---|
| 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.
Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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