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Asked: 2026-05-21T08:46:24+00:00

Possible Duplicate: Can’t operator == be applied to generic types in C#? I have

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Possible Duplicate:
Can’t operator == be applied to generic types in C#?

I have a DatabaseLookup{} class where the parameter T will be used by the lookup methods in the class. Before lookup, I want to see if T was already looked up with something like

if (T == previousLookupObject) ...

This doesn’t compile at all. What is preventing me from making a simple comparison like this?

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1 Answer

  1. Editorial Team

    T is the type parameter. If your previousLookupObject is an object of Type, you need to do typeof(T) == previousLookupObject.

    If previousLookupObject is variable of type T, you need to have an actual object of T to compare it to.

    If you want to find out if previousLookupObject is of type T, you need to use the is operator: if (previousLookupObject is T).

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