实体框架，如果不指定主键就无法添加新对象

Question

I am trying to use Identity to make the tables autoincrement the key upon insert. It worked nicely when I used a simple SQL query to insert a value.

CREATE TABLE [dbo].[extrak] 
(
    [Id]                   INT         IDENTITY (1, 1) NOT NULL,
    [kategorianev]         VARCHAR(50) NULL,
    [nev]                  VARCHAR(50) NULL,
    [ar]                   INT         NULL,
    [szin]                 VARCHAR(50) NULL,
    [tobbszor_hasznalhato] TINYINT     NULL,

    PRIMARY KEY CLUSTERED ([Id] ASC)
);

However when I use C# code to add a value, I get an exception saying that I should set identity_insert on (I suppose this is when I want to specify a primary key, but I might have missed something). I tried setting It on also, but didn't work (right before calling the add method).

extrak extra = new extrak();
extra.kategorianev = categoryname;
extra.nev = name;
extra.ar = price;
extra.szin = color;
extra.tobbszor_hasznalhato = b;
Console.WriteLine("1");
DataBaseHandler.AddNewExtra(extra);
Console.WriteLine("2");
DataBaseHandler.SaveDB();

The exception happens on saving. Do I have to find the new primary key for myself, and insert that way? Or can I make Entity Framework handle It somehow?

Answer 1

My mate got It. I had to update the model in VS to make It work.

After that the code above worked nicely.