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dominicwong

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How to convert a 39-decimal characters into hex in c#

Hi experts
I've a string representation of a 39-characters long decimal integer.
I need to convert this into hex format in C#.
eg. 340282366920938463463374607431768211455 (39 characters)
      -> ffffffffffffffffffffffffffffffff (32 characters)

By the same token, I need to be able to reverse the operation from hex to decimal.

I am using C# .NET 3.5 which hasn't got BigInteger.

Any advice please.  Thanks in advance.
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QuinnDex
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Jacques Bourgeois (James Burger)
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There is a BigInteger. It is "hidden" in the System.Numerics namespace, available after referencing the dll by the same name.

If you can get a string representation of your value, the following will do the job:

BigInteger bigInt = BigInteger.Parse ( "340282366920938463463374607431768211455" );
string bigHex = bigInt.ToString ("X");
bigInt = BigInteger.Parse ( bigHex, System.Globalization.NumberStyles.HexNumber );

Otherwise, give a look at the BigInteger Structure in the documentation, it is quite exhaustive.
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QuinnDex
BigInteger is part of .net 4, OP is working with .net 3.5
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dominicwong

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Thanks QuinnDex. That works like a charm, and is exactly what I need.

Thanks also to JamesBurger for your help.