✅ typeof()?

KleinRiese · 2024-09-21T10:18:59.365Z

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?

S

SleepWellPupper•9/21/24, 11:02 AM

Does your hashmap look like

Dictionary<Type, Object>()

Dictionary<Type, Object>()

Dictionary<Type, Object>()

Dictionary<Type, Object>()?
You can indeed obtain a

Type

Type

Type

Type object representing your class using

typeof(MyClass)

typeof(MyClass)

typeof(MyClass)

typeof(MyClass).
If you don't know the class at compile time, you can use

myClassInstance.GetType()

myClassInstance.GetType()

myClassInstance.GetType()

myClassInstance.GetType() to get a

Type

Type

Type

Type instance representing

MyClass

MyClass

MyClass

MyClass at runtime.

K

KleinRieseOP•9/21/24, 11:06 AM

Thanks

K

KleinRieseOP•9/21/24, 11:06 AM

I will try to implement that

C

canton7•9/21/24, 11:07 AM

Note that, given:

string foo = "";

string foo = "";

string foo = "";

string foo = "";

You can do

typeof(string)

typeof(string)

typeof(string)

typeof(string), but

typeof(foo)

typeof(foo)

typeof(foo)

typeof(foo) makes no sense. The thing you pass to

typeof

typeof

typeof

typeof has to be a type, not a variable.

If you have:

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

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

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

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

Then again you can do

typeof(T)

typeof(T)

typeof(T)

typeof(T).

K

KleinRieseOP•9/21/24, 11:07 AM

Oh

C

canton7•9/21/24, 11:08 AM

If you have a variable and you want to get its runtime type, that's then

GetType() is used

GetType() is used

GetType() is used

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

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

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

K

KleinRieseOP•9/21/24, 11:08 AM

okay thank you

K

KleinRieseOP•9/21/24, 11:08 AM

That is exactly the thing i need

C

canton7•9/21/24, 11:09 AM

So when you do the

Dictionary<Type, object>

Dictionary<Type, object>

Dictionary<Type, object>

Dictionary<Type, object> thing, you'd normally have generic Add and Get methods, and you'd use

typeof(T)

typeof(T)

typeof(T)

typeof(T) in them

K

KleinRieseOP•9/21/24, 11:09 AM

Okay thanks

✅ typeof()?

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