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The 5 Different Meanings Of The Question Mark In C#

The 5 Different Meanings of the Question Mark in C#

In C# the question mark has 5 meanings as of C# 8.

  1. Ternary operators
(true ? "true": "false")

2. Null conditional operator


3. Nullable types (this should be rebranded as nullable value types)


4. Null-coalescing operator

isnull ?? string.Empty

5. Nullable reference types


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