C#, how to make an increment of int declared as object?

Question

I have an external system which gives me an object value (I know that this value always a boxed integer type). I would like to increment it in the usual way: int value += otherIntValue, but I get an error from the compiler:

Operator '+=' cannot be applied to operands of type

For example:

//source values i cannot to change it
object targetInt = 100;
int incrementedValue = 20;

//usual way - not works
targetInt += incrementedValue;    

//ugly workaround
targetInt = ((int) targetInt) + incrementedValue;

Is there a way to increment instances of int and object with targetInt += incrementedValue;?

Answer 1

Just don't change your code. It's perfectly fine to cast your object to an integer so it is possible to make the addition with another integer.