Cannot convert lambda expression to type 'object' because it is not a delegate type

Question

I have a base class that has a bool property which looks like this:

public abstract class MyBaseClass
{
     public bool InProgress { get; protected set; }
}         


        

Answer 1

I ran into this problem while writing unit tests. I was attempting to mock the behavior of a database to return a new object from a repository instead of actually connecting to a database.

Make sure your object has a usable constructor. You may not be able to successfully instantiate that object the way you want to. Ensure if you using a lambda to point to a constructor that the constructor can be called in the same way in a normal instantiation statement.

i.e.

return x => new FakeObject();

say in the case of

var fake = new FakeObject();

would not work then the lambda will also fail so be careful.