EF 6.1 Unique Nullable Index

Question

In EF 6.1 using Code First you can create Indexes using Attributes in your Entities or using the fluent API along the lines of:

 Property(x => x.PropertyN         


        

Answer 1

In EF Core you can use the HasFilter method in the fluent API to achieve what you're looking for without adding custom SQL to the migration.

builder.Entity()
    .HasIndex(x => x.PropertyName)
    .HasName("IX_IndexName")
    .HasFilter("PropertyName IS NOT NULL");
This generates a migration like this:
migrationBuilder.CreateIndex(
    name: "IX_IndexName",
    table: "Table",
    columns: new[] { "PropertyName" },
    filter: "PropertyName IS NOT NULL");

                                                        

              
                
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