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c#genericsextension-methods
Scott Baker
Scott Baker

Reputation: 10443

What determines whether I can use the comparison operators?

I wrote a generic extension method to see if a Key is in a certain range:

public static bool IsInRange(this Key key, Key lowerBoundKey, Key upperBoundKey )
{
    return lowerBoundKey <= key && key <= upperBoundKey;
}

That seems simple enough, but suppose I want to write a generic method equivalent that will work with any type that can use the <= comparison operator:

public static bool IsInRange(this T value, T lowerBound, T upperBound )
{
    return lowerBound <= value && value <= upperBound;
}

How do I apply where T : ISomethingIDontKnow so I can make this compile?

Upvotes: 1

Views: 42

Answers (1)

Nkosi
Nkosi

Reputation: 247123

Converting the method to a generic method with where T : IComparable should be enough for this to work. 

public static bool IsInRange<T>(this T value, T lowerBound, T upperBound ) 
    where T : IComparable {

    return value != null && lowrBound != null && upperBound !=null
           && lowerBound.CompareTo(value) <= 0 && value.CompareTo(upperBound) <= 0;
}

Upvotes: 3

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