'How to compare nullable types?

I have a few places where I need to compare 2 (nullable) values, to see if they're the same.

I think there should be something in the framework to support this, but can't find anything, so instead have the following:

public static bool IsDifferentTo(this bool? x, bool? y)
{
    return (x.HasValue != y.HasValue) ? true : x.HasValue && x.Value != y.Value;
}

Then, within code I have if (x.IsDifferentTo(y)) ...

I then have similar methods for nullable ints, nullable doubles etc.

Is there not an easier way to see if two nullable types are the same?

Update:

Turns out that the reason this method existed was because the code has been converted from VB.Net, where Nothing = Nothing returns false (compare to C# where null == null returns true). The VB.Net code should have used .Equals... instead.

c++sharpextension-methodsnullable


Solution 1:[1]

Nullable.Equals<T>?

Solution 2:[2]

if (x.Equals(y))

Solution 3:[3]

You can use the static Equals method on System.Object:

var equal = object.Equals(objA, objB);

Solution 4:[4]

Use Compare:

http://msdn.microsoft.com/en-us/library/dxxt7t2a.aspx

Solution 5:[5]

Just use ==, or .Equals().

Solution 6:[6]

I wanted to find how to compare two nullable int on C#, but I always get this link after search, so if someone needs to compare exactly two nullable int, then this can be helpful

a.GetValueOrDefault(int.MinValue).CompareTo(b.GetValueOrDefault(long.MinValue));

Solution 7:[7]

(x?? 0).Equals(y)

will handle null as well as equals.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Anton Gogolev
Solution 2 Kashif
Solution 3 Mark Seemann
Solution 4 Lucero
Solution 5 Lucero
Solution 6 hdd42
Solution 7 Zoe stands with Ukraine

Related Questions