CODEWITHSUNDEEP
c#asp.net-mvcasp.net-web-api2
Archil Labadze
Archil Labadze

Reputation: 4325

If I'm using Guid Identity Web Api 2 It gives me an error

So here is my Exmaple: Model:

[Table("Items")]
public class Item
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid Id { get; set; }
    [Required]
    public string Name { get; set; }
}

And my Web Api 2 Controller Part:

// POST: api/Items
[ResponseType(typeof(Item))]
public async Task<IHttpActionResult> PostItem(Item item)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }
    item.Id = Guid.NewGuid();
    db.Items.Add(item);
    await db.SaveChangesAsync();

    return CreatedAtRoute("DefaultApi", new { id = item.Id }, item);
}

On insert I receive an error, but if I use string and Guid.NewGuid().Tostring(); everything works fine, there is no problem to develop my App in this way but I want understand what is the problem, using GUID like this works on MVC5.

Upvotes: 0

Views: 734

Answers (1)

Hamed
Hamed

Reputation: 588

Because of using Guid as your Id type, It can't be defined to be an property identity, so remove this annotation above your Id:

[DatabaseGenerated(DatabaseGeneratedOption.Identity)]

and add Guid.NewGuid() in constructor of your model:

[Table("Items")]
public class Item
{
    public Item(){
      Id=Guid.NewGuid();
    }

    [Key]
    public Guid Id { get; set; }
    [Required]
    public string Name { get; set; }
}

And then don't set your Id to Guid.NewGuid(), just make a new object of your class.

Upvotes: 2

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