Index Attribute resolving issue in Microsoft.EntityFrameworkCore

Question

I have got.Net Standart 2.0 dll to keep separated entities of MS SQL Server.

The Index Attribute cannot be resolving.

I've did search and experimented with adding some namespaces of Entity Framework but nothing works even by MSDN .

Please, help. Thank you!

Answer 1

IndexAttribute Class

Specifies an index to be generated in the database.

Entity Framework Core

• 5.0

You are not using EF core 5. You will need to use the model Builder instead

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Read more here

Indexes

Configuring indexes via Data Annotations has been introduced in EF Core 5.0.

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Blog>()
        .HasIndex(b => b.Url);
}