What type can't C# Generic class parameter be?

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I know that C# generic class CAN'T take as a parameter
1. static class

C#

public static class StaticClass
{...}

...
GenericClass<StaticClass> obj= new GenericClass<StaticClass>();
...

2. pointer( in unsafe mode )

C#

...
GenericClass<int*> obj = new GenericClass<int*>();
...

What type else generic class parameter can't be?

Posted 15-May-14 3:22am

kDiana

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thursunamy 15-May-14 9:58am

Hi,

Actually it is related to your Generic Class Definition. It changes according to your definition. You can check http://msdn.microsoft.com/en-us/library/d5x73970.aspx

kDiana 16-May-14 2:24am

Question is not related to Generic class parameter constraints.

Sergey Alexandrovich Kryukov 15-May-14 17:37pm

Why not reading standard MSDN documentation?
—SA

kDiana 16-May-14 1:25am

Sergey Alexandrovich, I've looked through whole c# documentation, googled a lot but can't found anything proper. If you could provide my question answer in MSDN I'd be very thankful to you.

Vedat Ozan Oner 16-May-14 2:40am

actually that is an interesting question, but I try to understand the motivation behind it. why do you ask such a question about what can't be done? you use a language to do something. not 'not to do' something. yes, you can find 'to do' set by negating 'not to do' list, but you can ask 'to do' set directly :) the next question after that question would be 'why', which makes more sense in terms of understanding the background of the design. for example why not to use a static type parameter with a generic class. this may lead to another good talk.

kDiana 16-May-14 6:03am

I know it seem strange, that I try to find something that is not allowed, but it will help to understand generics background more better than I do now.
I can explain you why you can't use static class as Generic class parameter - Why do we use generics? Because we want to combine similar functionality for different types. And what is static class? It is unique data set. You can't find similar static classes which differ only by inner used type(by generic parameter). That is why you can't use it as generic class parameter. And we have the same situation with pointers.

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kDiana · Answer 1 · 2015-02-01T23:30:00

Finally, I found it!!!
It is dynamic class.
Dynamic class can't be parameter of Generic class.

When talking about dynamic class, I mean this =>

C#

/* Load in the assembly. */
 moduleAssembly = Assembly.LoadFile(fileName);

  /* Get the types of classes that are in this assembly. */
  Type type = moduleAssembly.GetTypes();

/* Create a new instance */
Activator.CreateInstance(type);