Test for equality to the default value

Question

The following doesn\'t compile:

public void MyMethod(T value)
{
    if (value == default(T))
    {
        // do stuff
    }
}

Answer 1

To avoid boxing for struct / Nullable, I would use:

if (EqualityComparer.Default.Equals(value,default(T)))
{
    // do stuff
}

This supports any T that implement IEquatable, using object.Equals as a backup, and handles null etc (and lifted operators for Nullable) automatically.

There is also Comparer.Default which handles comparison tests. This handles T that implement IComparable, falling back to IComparable - again handling null and lifted operators.