将另一个列表中的属性添加到实体

Question

I have spent hours to find the answers on SO. I either don't know how to search or maybe I am asking the question wrong.

Here is the situation:

I have an entity Customers. I get this from my db context like db.Customers. I have users. Those are not in my own database but in the database of the CMS. I can retrieve all the users using a thing like UserManager.GetUsers which will give me a IQueryable of the User object (same User object as in System.Web.Security.

Now I want to create one list containing all the customers, but I want in that same list also the properties from the User object like IsLockedOut and LastActivityDate.

I thought it would be simple by creating a new object that has a property Customer and then the other properties. But everytime I put something in the Linq query as GetUser or IsUserLockedOut I get compile errors like "LINQ to Entities does not recognize the method" or "Only parameterless constructors and initializers are allowed".

Is there any way in getting this to work?

Answer 1

You can't simply add properties to a concrete type using a Linq query - you can certainly create an anonymous type that has a Customer property and whatever other fields you want to add to the anonymous type.

The error you are getting is because you are embedding a custom method call that can't be directly translated to SQL into your Linq query somewhere. Post your Linq query and it will probably be easy to spot.