EF code first: Cannot insert explicit value for identity column in table '' when IDENTITY_INSERT is set to OFF

Question

I have issue with EF code first

when I am trying to insert new record into table I recieve message.

Cannot insert explicit value for identity column          


        

Answer 1

You don't need to change mapping code, instead you should change this line:

lngRequestLineID = 1001233

to this:

lngRequestLineID = 0

In my expirence decorating de Id entity's property with [KeyAttribute] is enought.

Answer 2

Ok, I have found it. The database has been set up correctly, but my mapping has been incorrect.

public class tblResponsMap : EntityTypeConfiguration<tblRespons>
{
public tblResponsMap()
{
    // Primary Key
    this.HasKey(t => new { t.lngResponseLineID});

    // Properties
    this.Property(t => t.lngResponseLineID)
        .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); <-- here

    this.Property(t => t.lngRequestLineID);

    // Table & Column Mappings
    this.ToTable("tblResponses");
    this.Property(t => t.lngResponseLineID).HasColumnName("lngResponseLineID");
    this.Property(t => t.lngRequestLineID).HasColumnName("lngRequestLineID");
    this.Property(t => t.fAdhoc).HasColumnName("fAdhoc");
    this.Property(t => t.memXMLResponse).HasColumnName("memXMLResponse");
}
}