How to turn on identity-insert in .net core

Question

I made a few tables in EF and entered in some seed data where I give value to a few columns with a primary key. When I run the application I am getting the error message: <

Answer 1

Had to deal with the same issue and this seems to be a clean solution.

Credit to >> https://github.com/dotnet/efcore/issues/11586

I have made some changes so it now works with .Net Core 3.1 + (Tested in .Net 5) and also added this Method SaveChangesWithIdentityInsert

    public static class IdentityHelpers
{
    public static Task EnableIdentityInsert(this DbContext context) => SetIdentityInsert(context, enable: true);
    public static Task DisableIdentityInsert(this DbContext context) => SetIdentityInsert(context, enable: false);

    private static Task SetIdentityInsert(DbContext context, bool enable)
    {
        var entityType = context.Model.FindEntityType(typeof(T));
        var value = enable ? "ON" : "OFF";
        return context.Database.ExecuteSqlRawAsync(
            $"SET IDENTITY_INSERT {entityType.GetSchema()}.{entityType.GetTableName()} {value}");
    }

    public static void SaveChangesWithIdentityInsert(this DbContext context)
    {
        using var transaction = context.Database.BeginTransaction();
        context.EnableIdentityInsert();
        context.SaveChanges();
        context.DisableIdentityInsert();
        transaction.Commit();
    }

}

Usage

        var data = new MyType{SomeProp= DateTime.Now, Id = 1};
            context.MyType.Add(data);
        context.SaveChangesWithIdentityInsert();