Convert a binary, octal, or hexadecimal value to decimal

Convert a binary, octal, or hexadecimal value to decimal

The Convert class offers a few static methods that let you easily and quickly convert a binary, octal, or hexadecimal number(stored in a String) into the equivalent Byte, Short, Integer, or Long value. These are the methods in question:

Dim b As Byte = Convert.ToByte(value, fromBase)Dim s As Short = Convert.ToInt16(value, fromBase)Dim i As Integer = Convert.ToInt32(value, fromBase)Dim l As Long = Convert.ToInt64(value, fromBase)

In all cases, value is a string that holds a number in the base indicated by the fromBase argument, which can only be 2, 8, 10, or 16. There are also methods for converting to signed bytes or unsigned 16-, 32-, and 64-bit integers, but you rarely need them becase VB.NET doesn’t support these data types.

Here’s an example that uses the ToInt32 method to convert an hexadecimal value:

Console.WriteLine ( Convert.ToInt32("ABCD", 16))   ' => 43981

These methods throw a FormatException if the first argument contains one or more chracters that aren’t compatible with the base specified in the second argument.

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