CODEWITHSUNDEEP
c#linqentity-frameworkentity-framework-4
kkocabiyik
kkocabiyik

Reputation: 4416

Dynamic check of derived class type in Linq C#

I have a Platform class as a base class and there are 2 more classes IOSPlatform and AndroidPlatform that are derived from Platform.

In addition to this, there is a Device class that has Platform object as a navigation property.

While querying all IOS platform devices, the linq expression below is working like a charm.

devices.Where(t=> t.Platform is IOSPlatform)

I want to improve this query with making it dynamic check of class type such as: 

Platform p = new IOSPlatform();
devices.Where(t=> t.Platform is /*derived class of p object*/)

Is there a way to do this ?

Best Regards,

Kemal

Upvotes: 0

Views: 1195

Answers (4)

Jeppe Stig Nielsen
Jeppe Stig Nielsen

Reputation: 62002

I'm not sure I understand, but it sounds like you want

devices.Where(t =>
    p.GetType().IsAssignableFrom(t.Platform.GetType())
    );

Upvotes: 1

L.B
L.B

Reputation: 116168

Platform p = new IOSPlatform();
devices.Where(t=> t.Platform.GetType()==p.GetType())

Upvotes: 4

Omar
Omar

Reputation: 16623

What about:

Platform p = new IOSPlatform();
devices.Where(t=> t.Platform.GetType().BaseType == p.GetType());

Upvotes: 1

Rodrigo Vedovato
Rodrigo Vedovato

Reputation: 1008

Are you trying to verify if the object on your list inherits from Platform? The "is" operator already verifies that .. you could just use this:

devices.Where(d => d.Platform is Platform);

Or even use the OfType method:

devices.OfType<IOSPlatform>();

Upvotes: 0

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