Question

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How to convert numbers between hexadecimal and decimal in C#?

I need to be able to take a hexadecimal string and convert it into actual hexadecimal value in .NET. How do I do this?

For instance, in Delphi, you can take string of “FF” and add the dollar sign as follow to it.

tmpstr := '$'+ 'FF';

Then, convert tmpstr string variable into an integer to get the actual hexidecimal. The result would be 255.

Answer 1

Assuming you are trying to convert your string to an int:

var i = Int32.Parse("FF", System.Globalization.NumberStyles.HexNumber)

Your example 1847504890 does not fit on an int, however. Use a longer type instead.

var i = Int64.Parse("1847504890", System.Globalization.NumberStyles.HexNumber)