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What is the difference between these operators?

var c = foo?.Prop1; 
var c = foo!.Prop1;

Btw, Prop1 is an int.

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    ! tells the compiler: "trust me, this isn't null" but at runtime an exception can happen if you've lied. ? handles a possible null value, so that everything after it is also null. Commented Oct 24, 2022 at 14:01

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Well ? is null conditional when ! is null forgiving operators:

  • ?. in case of full is null do nothing (or return null)
  • !. do not believe that foo can ever be null and stop warning me.

So if foo is null

var c = foo?.Prop1; // c will be null (c will be of type int?) var d = foo!.Prop1; // exception will be thrown (d is int)
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Also worth mentioning that if Prop1 is an int, than c is a nullable int and d is an int .

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