CODEWITHSUNDEEP
.netperformancegenerics
BanksySan
BanksySan

Reputation: 28558

typeof(T) versus o.GetType()

For a method

public void Foo<T>(T o)
{
    var oType = o.GetType();
    var tType = typeof(T);
}

Is there anything I should consider when choosing which one to use, either functional or non-functional?

Answer from Jon below.

I've created a fiddle to demonstrate it:

https://dotnetfiddle.net/Y4bAGf

Upvotes: 4

Views: 69

Answers (1)

Jon
Jon

Reputation: 437734

Of course: you should consider whether you want the resulting type to match the static or runtime type of the argument.

This may be the same type in your typical use case, but that cannot be taken for granted. For example:

Foo<object>(string.Empty); // oType = string, tType = object

Moreover, in the general case you have to be careful to not call GetType on null.

Upvotes: 4

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