Equality operators (== and !=) on Nullable - CSharp Language Basics

Introduction

Lifted equality operators handle nulls just like reference types do. This means two null values are equal:

Console.WriteLine (       null ==        null);   // True
Console.WriteLine ((bool?)null == (bool?)null);   // True

If exactly one operand is null, the operands are unequal.

If both operands are non-null, their Values are compared.

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Related Tutorials

• Implicit and explicit nullable conversions
• Boxing and unboxing nullable values
• Operator Lifting
• Relational operators (<, <=, >=, >) on nullable value
• Mixing nullable and non-nullable operators