C# What does ? in Arguments Allow

Question

I have some code: partial void FuncName(TimeSpan? value) What does having the nullable operator there allow me to do? If it wasn't there could I not pass a null TimeSpan at all? Do I need it for every argument I pass that could be null?

Thanks

That means it is `Nullable` type. – Hari Prasad May 18 '15 at 04:25 — Hari Prasad, May 18 '15 at 04:25

score 2 · Accepted Answer · answered May 18 '15 at 04:26

The ? is for nullable, it will allow you to pass null in the TimeSpan.

Nullable Types

Nullable types are instances of the System.Nullable struct. A nullable type can represent the correct range of values for its underlying value type, plus an additional null value. For example, a Nullable, pronounced "Nullable of Int32," can be assigned any value from -2147483648 to 2147483647, or it can be assigned the null value.

score 1 · Answer 2 · answered May 18 '15 at 04:30

1

The sign ? with DataType indicates that Datatype is nullable.

You can read more about Nullable types here

answered May 18 '15 at 04:30

Hari Prasad

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C# What does ? in Arguments Allow

2 Answers2