Entity Framework error: Cannot insert explicit value for identity column in table

Question

I\'m getting this error on EF.

Cannot insert explicit value for identity column in table \'GroupMembers_New\' when IDENTITY_INSERT is set to OFF.

Answer 1

I had this issue in my app; and got fixed it changing the property "StoredGeneratedPattern" of the id field to Identity.

So, Go to the model; look up for the table; click on propierties of the primary key fiel; and change the property.

Answer 2

First match in google, so here is my solution:

EF Code first: Because of an auto-increment PK 'id' field AND a guid column, design like this:

[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public Guid FileToken { get; set; }

there was a duplicate identity. I changed it to:

[DatabaseGenerated(DatabaseGeneratedOption.Computed)]
[DefaultValue("newid()")]
public Guid FileToken { get; set; }

and the problem went away.

Hope it helps you.

Erik

Answer 3

I have run into this before. This error means you are trying to assign a value explicitly to a column where the database automatically assigns it.

Suggestion: Update your edmx file to reflect any changes you may have made in the database. If the database automatically assigns the value, you should see the "IsDbGenerated=true" attribute in your designer file under that property. If it's not there, you can add it manually.

Answer 4

I encountered the same problem and error message in my AspNetCore 2.x application. The only way I could solve it was by removing this line in the ModelBuilder.Entity method of the DbContext class:

// remove: entity.Property(e => e.Id).ValueGeneratedNever();

Answer 5

See intercepting Entity Insert for generated always columns like StartTime and EndTime columns on history tables, rowversion columns as well.

Answer 6

Put these attribs on top of the property which is identity:

[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int ID { get; set; }