C#•2mo ago

✅ typeof()?

I am trying to arrange objects in a hashmap: The key should be the class and the Value a List with the instances of this class. Is typeof ()the right function for this?

8 Replies

SleepWellPupper•2mo ago

Does your hashmap look like Dictionary<Type, Object>()? You can indeed obtain a Type object representing your class using typeof(MyClass). If you don't know the class at compile time, you can use myClassInstance.GetType() to get a Type instance representing MyClass at runtime.

KleinRiese•2mo ago

Thanks I will try to implement that

canton7•2mo ago

Note that, given:

string foo = "";

string foo = "";

You can do typeof(string), but typeof(foo) makes no sense. The thing you pass to typeof has to be a type, not a variable. If you have:

public void Add<T>(T foo)
{
    // ...
}

public void Add<T>(T foo)
{
    // ...
}

Then again you can do typeof(T).

KleinRiese•2mo ago

canton7•2mo ago

If you have a variable and you want to get its runtime type, that's then GetType() is used. Note that this might not be the same as its compile-time type:

object foo = "";
typeof(object) // object
foo.GetType() // string

object foo = "";
typeof(object) // object
foo.GetType() // string

KleinRiese•2mo ago

okay thank you That is exactly the thing i need

canton7•2mo ago

So when you do the Dictionary<Type, object> thing, you'd normally have generic Add and Get methods, and you'd use typeof(T) in them

KleinRiese•2mo ago

Okay thanks

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✅ typeof()?