Hello, I have an object wich is type of ObservableCollection<T> var oc = new ObservableCollection<MyClass>(); How to get know what type uses ObservableCollection (what type is T parameter)?

Hello, Welcome to Microsoft Q&A! For your requirement, you could examine Generic Types with Reflection. For more info please refer the following code. And here is official document that you could refer to. var oc = new ObservableCollection<MyClass>(); var toc = oc.GetType(); Type[] typeParameters = toc.GetGenericArguments(); var ctype = typeParameters[0]; Thank you. If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

How to get class from ObservableCollection

Accepted answer

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,856 Reputation points

2021-12-16T01:26:42.547+00:00
Hello,
Welcome to Microsoft Q&A!

For your requirement, you could examine Generic Types with Reflection. For more info please refer the following code. And here is official document that you could refer to.

var oc = new ObservableCollection<MyClass>(); var toc = oc.GetType(); Type[] typeParameters = toc.GetGenericArguments(); var ctype = typeParameters[0];

Thank you.

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
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BitSmithy 1,751 Reputation points

2021-12-16T15:32:24.127+00:00

Ok you get the MyClass from observable collection

var oc = new ObservableCollection<MyClass>();
var toc = oc.GetType();
Type[] typeParameters = toc.GetGenericArguments();
var ctype = typeParameters[0];

but why this doesnt work? Is it possible to do something like showed below

var oc2 = new ObservableCollection<ctype>();

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,856 Reputation points

2021-12-17T01:31:09.797+00:00

No, you can't use ctype to replace MyClass as generic arguments, because ctype is Type of MyClass. but not MyClass itself.

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,856 Reputation points

2021-12-17T01:43:05.577+00:00

if you want to implement oc2 from ctype, you need call MakeGenericType like the following

var ctype = typeParameters[0]; var makeoc2 = typeof(ObservableCollection<>).MakeGenericType(ctype); object oc2 = Activator.CreateInstance(makeoc);

BitSmithy 1,751 Reputation points

2021-12-20T12:27:00.853+00:00

Is there a possiblility to get MyClass itself, and use it again

var ctype = typeParameters[0];

MyClassItself = ....//code which creates my class iself

I want to use MyClassItself in two scenarios:

var oc2 = new ObservableCollection<MyClassItself >();

if (something is MyClassItself sth)
.....

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,856 Reputation points

2021-12-21T01:33:53.387+00:00

I'm afraid there is no such api to use Type as class name directly.
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How to get class from ObservableCollection

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