Can parameters be constant?

Question

I\'m looking for the C# equivalent of Java\'s final. Does it exist?

Does C# have anything like the following:

public Fo         


        

Answer 1

If struct is passed into a method, unless it's passed by ref, it will not be changed by the method it's passed into. So in that sense, yes.

Can you create a parameter whose value can't be assigned within the method or whose properties cannot be set while within the method? No. You cannot prevent the value from being assigned within the method, but you can prevent it's properties from being set by creating an immutable type.

The question isn't whether the parameter or it's properties can be assigned to within the method. The question is what it will be when the method exits.

The only time any outside data is going to be altered is if you pass a class in and change one of it's properties, or if you pass a value by using the ref keyword. The situation you've outlined does neither.

Answer 2

Here's a short and sweet answer that will probably get a lot of down votes. I haven't read all of the posts and comments, so please forgive me if this has been previously suggested.

Why not take your parameters and pass them into an object that exposes them as immutable and then use that object in your method?

I realize this is probably a very obvious work around that has already been considered and the OP is trying to avoid doing this by asking this question, but I felt it should be here none-the-less...

Good luck :-)

Answer 3

The answer: C# doesn't have the const functionality like C++.

I agree with Bennett Dill.

The const keyword is very useful. In the example, you used an int and people don't get your point. But, why if you parameter is an user huge and complex object that can't be changed inside that function? That's the use of const keyword: parameter can't change inside that method because [whatever reason here] that doesn't matters for that method. Const keyword is very powerful and I really miss it in C#.