如何将给定正整数(字符串格式)转换为十六进制格式?(c#)

Given a potentially huge integer value (in C# string format), I want to be able to generate its hex equivalent. Normal methods don't apply here as we are talking arbitrarily large numbers, 50 digits or more. The techniques I've seen which use a technique like this:Given a potentially huge integer value (in C# s