primary key nullable problem

Question

Hi friend i have a problem "Unable to track an entity of type 'Customer' because its primary key property 'CustomerId' is null.' I want to see the database from the screen but at that time I am facing such a problem

Answer 1

A primary should not be nullable e.g.

public partial class CustomersConfiguration : IEntityTypeConfiguration<Customers>  
{  
    public void Configure(EntityTypeBuilder<Customers> entity)  
    {  
        entity.HasKey(e => e.CustomerIdentifier)  
            .HasName("PK_Customers_1");  
  
        . . .   
        OnConfigurePartial(entity);  
    }  
}