Convert.ToInt64 Method (String, Int32)

ConvertToInt64 Method (String, Int32)

Converts the string representation of a number in a specified base to an equivalent 64-bit signed integer.

Namespace: System
Assembly: mscorlib (in mscorlib.dll) Version: 4.0.0.0

Syntax

public static long ToInt64(
	string value,
	int fromBase
)

value: Type: SystemString
A string that contains the number to convert.
fromBase: Type: SystemInt32
The base of the number in value, which must be 2, 8, 10, or 16.

Type: Int64
A 64-bit signed integer that is equivalent to the number in value, or 0 (zero) if value is null.

Exceptions

Exception	Condition
ArgumentException	fromBase is not 2, 8, 10, or 16. -or-value, which represents a non-base 10 signed number, is prefixed with a negative sign.
FormatException	value contains a character that is not a valid digit in the base specified by fromBase. The exception message indicates that there are no digits to convert if the first character in value is invalid; otherwise, the message indicates that value contains invalid trailing characters.
OverflowException	value, which represents a non-base 10 signed number, is prefixed with a negative sign.-or-value represents a number that is less than MinValue or greater than MaxValue.