C# Why does '+' + a short convert to 44

I have a line of code that looks like this:

MyObject.PhoneNumber = '+' + ThePhonePrefix + TheBizNumber;

Basically, I'm creating a phone number in E164 format and then I assign that string to a string property of an object. ThePhonePrefix is a short that holds the international phone prefix and TheBizNumber is a string that holds the phone number digits.

Why didn't the compiler bug when I was concatenating a short in the string in the first place? And then why does '+' + 1 equal 44?? This was a pretty hard bug to track because there was no compile error and 44 is the phone prefix for the UK so everything "looked"
like it was working because the client-side code just saw a UK number. Why 44?

Thanks.

Answer:

Why didn't the compiler bug when I was concatenating a short in the string in the first place?

String concatenation using + sign
internally calls string.Concat,
which internally calls ToStringon
each parameter. Hence no error.

why does '+' + 1

You are doing character/numeric arithmetic. 43 being
value of + and
short/int 1 is
44.

Because of operator + associativity from left to right it is first character/numeric addition and then string concatenation.

So it is like:

MyObject.PhoneNumber = ('+' + ThePhonePrefix) + TheBizNumber;

You can use "+" to
mark it as a string or explicitly call String.Concat like:

var result = string.Concat('+', ThePhonePrefix, TheBizNumber);

website:http://stackoverflow.com/questions/29397495/why-does-a-short-convert-to-44