Is this possible somehow in C# : if (a==b==c==d) {...}

Question

Hi,

Is there a quick way to compare equality of more than one values in C#?

something like:

if (5==6==2==2){

//do something

}

Thanks

Answer 1

if (a == b && b == c && c == d) {
    // do something
}

Answer 2

No this is not possible, you have to split it into separate statements.

if(x == y && x == z) // now y == z
{
}

Good luck

Answer 3

There is no direct way to do it using C#, but you can go with some helper class. Check out this VB.NET topic dedicated to this problem http://stackoverflow.com/questions/686485/vb-net-test-multiple-values-for-equality

Answer 4

In C#, an equality operator (==) evaluates to a bool so 5 == 6 evaluates to false.

The comparison 5 == 6 == 2 == 2 would translate to

(((5 == 6) == 2) == 2)

which evaluates to

((false == 2) == 2)

which would try to compare a boolwith an int. Only if you would compare boolean values this way would the syntax be valid, but probably not do what you want.

The way to do multiple comparison is what @Joachim Sauer suggested:

 a == b && b == c && c == d

Answer 5

public static class Common {
    public static bool AllAreEqual<T>(params T[] args)
    {
        if (args != null && args.Length > 1)
        {
            for (int i = 1; i < args.Length; i++)
            {
                if (args[i] != args[i - 1]) return false;
            }
        }

        return true;
    } 
}

...

if (Common.AllAreEqual<int>(a, b, c, d, e, f, g)) 

This could help :)