Question

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Will all methods in a logical expressions be executed?

Let me explain: let’s say we have theese two codes:

foreach(Object o in Objs)
    if(o is Class1 || o is Class2)
        DoSomething();

__

foreach(Object o in Objs)
    if(o is Class1)
        DoSomething();
    else if(o is Class2)
        DoSomething();

Now, of course an OR is better in this case, but my question is different and just out of curiosity: when in the first case o is of type Class1, does the compiler stop and run the code or it checks what comes next anyway?
It would do that in the second case.

Answer 1

|| is short-circuiting, which means: if the first argument returns true, the second argument is not evaluated. In this way, yes it is broadly equivalent to your second example, but more terse.