Convert.ToInt64 Method (Object)
.NET Framework (current version)
Converts the value of the specified object to a 64-bit signed integer.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
-
Type:
System.Object
An object that implements the IConvertible interface, or null.
Return Value
Type: System.Int64A 64-bit signed integer that is equivalent to value, or zero if value is null.
| Exception | Condition |
|---|---|
| FormatException | value is not in an appropriate format. |
| InvalidCastException | |
| OverflowException | value represents a number that is less than Int64.MinValue or greater than Int64.MaxValue. |
If value is not null, this method wraps a call to the IConvertible.ToInt64 implementation of the underlying type of value.
The following example attempts to convert each element in an object array to a long integer.
object[] values = { true, -12, 163, 935, 'x', new DateTime(2009, 5, 12), "104", "103.0", "-1", "1.00e2", "One", 1.00e2, 16.3e42}; long result; foreach (object value 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 (OverflowException) { Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", value.GetType().Name, value); } catch (FormatException) { Console.WriteLine("The {0} value {1} is not in a recognizable format.", value.GetType().Name, value); } catch (InvalidCastException) { Console.WriteLine("No conversion to an Int64 exists for the {0} value {1}.", value.GetType().Name, value); } } // The example displays the following output: // Converted the Boolean value True to the Int64 value 1. // Converted the Int32 value -12 to the Int64 value -12. // Converted the Int32 value 163 to the Int64 value 163. // Converted the Int32 value 935 to the Int64 value 935. // Converted the Char value x to the Int64 value 120. // No conversion to an Int64 exists for the DateTime value 5/12/2009 12:00:00 AM. // Converted the String value 104 to the Int64 value 104. // The String value 103.0 is not in a recognizable format. // Converted the String value -1 to the Int64 value -1. // The String value 1.00e2 is not in a recognizable format. // The String value One is not in a recognizable format. // Converted the Double value 100 to the Int64 value 100. // The Double value 1.63E+43 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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