实体框架分配ID

Question

I'm working on a program using a SQL Server database. Using PUT/POST, I'm adding elements to the database. I run some code on the data, and then delete them afterwards. The issue now is, that when I add new data, the data added gets added with an increasingly high id number, rather than starting from 0.

I searched around, and found something that I thought would work, which is adding the below line above the Id. This, however, doesn't work, and I'm still getting an increasingly large Id number, when put into the database.

Is there a workaround for this?

[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public virtual int Id { get; set; }

public int ProducedkW { get; set; }
public int ConsumedkW { get; set; }

public string Type { get; set; }
public int DifferencekW { get; set; }

Answer 1

There are two possible ways i can think of:

1. Truncate table instead of deleting the records It may throw exception in case it's referenced as foreign key in some other table.
2. Run SET IDENTITY_INSERT <table name> ON on sql server, basically it then allows you to enter values explicitly in identity column. But keep in mind , you will have to set id in your code. But keep in mind , you may lost uniqueness of your column, you willhave to ensure it progamatically in your code then.

Answer 2

As alluded to in the comments, it sounds as though you do not want an IDENTITY column, but rather a regular INT column.

By removing the IDENTITY attribute of the column you are then free to control the IDs yourself. Just set the ID field on your Entity and when you call DbContext.SaveChanges it will take care of it.