How to create a Clustered Index with Entity Framework Core

Question

From EF6.1, we have a way of specifying a clustered index on a property

public class Person 
{
  [Index(IsClustered = true, IsUnique = true)]
  public long U         


        

Answer 1

For EF Core 3.0+ You can now use IsClustered:

modelBuilder.Entity()
.HasIndex(e => e.UserName)
.IsUnique()
.IsClustered();

.ForSqlServerIsClustered() is now marked as obsolete.

Also be aware that if you have a Primary Key on the table you may also need to explicitly remove the clustering on it before you add the clustering on your Username:

modelBuilder.Entity()
.HasKey(e => e.PersonId)
.IsClustered(false);

modelBuilder.Entity()
.HasIndex(e => e.UserName)
.IsUnique()
.IsClustered();