Cannot assign null to an implicitly-typed variable

Question

According to Visual Studio this is not ok:

var foo = null;

But this is ok:

var foo = false ? (double?)null : null;
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Answer 1

Assigning null to a var to a value, VS can't identify what type gonna be (double,int,bool etc). Var is commonly used when you don't know what type your value gonna be.

Your second declaration pinpoints the type as Nullable that's why you don't get an exception/error.