Question

I’ve created an ADO.NET model called EF and added a DbContext generator, which populates my /Model folder with an EF.tt and .cs files, one for each entity.

in general the system creates classes with parameterless constructors… for some reason I can’t fathom I have an entity that’s missing this constructore. It is not an abstract class, has not base type and has public access. I have tons of other such classes but they all have parameterless constructors. I’ve googled and looked around VS trying to figure what’s special about this one, and how I can make it generate the constructor, but find no answer.

I can always create this in a partial definition but I’d rather figure it out. Also, if I right-mouse click over the EF.tt I see a choice in the menu called “Run Custom Tool” but when I select it nothing seems to happen. How does one regenerate the .cs files?

p.s. yes, I have cleaned and rebuilt the solution in case it just got messed up but still problem

Answer 1

In C# (are you using C#?):

• When you define no constructor in your class, a parameterless constructor will be created by compiler by default
• When you define parameterless constructor (and maybe some others) the parameterless constructor will also be present as you defined it
• When you define more than zero constructors, but no parameterless one, the compiler does not create a parameterless constructor for you. In this case it’s your responsibility to define it (in partial class or not).