EF Code First从DB不为所有表创建实体

Question

I have an existing Database I am trying to use Entity Framework Code First From Database to generate C# entities for. To do this I am doing Add -> New Item -> ADO.NET Entity Data Model -> Code First from database inside Visual Studio 2015. When I go though the Entity Data Model Wizard I see that every table is selected but when the import finishes entities for some of the tables where not created. I have tried this twice and double checked that the table with no entities are indeed selected for import. No errors are thrown during the import so I am not sure why some of the tables are missing there entitles. What might be going wrong and how do I get an entities for every single selected table?

SQL Create Table Code for one of the missing tables:

CREATE TABLE [dbo].[ProgramControl] (
    [CodeName]    VARCHAR (80) NULL,
    [CodeValue1]  VARCHAR (50) NULL,
    [CodeValue2]  VARCHAR (50) NULL,
    [CodeValue3]  VARCHAR (50) NULL,
    [CodeValue4]  VARCHAR (50) NULL,
    [Description] TEXT         NULL
);

Answer 1

EF code-first requires the use of a primary key on every entity, so the tool is not able to map these tables.

It looks like you might be able to work around this with some trickery , but adding a PK to every table is almost certainly the best approach.

Answer 2

If Table does not have at least one parameter not null ADO.NET will not generate the class. I don't know if it is a bug, just happened to me. It is not necessary to have a primary key but a not null.