How to Manually Handle Key Generation in Entity Framework?

Custom primary key generation: Entity Framework guide

Entity Framework automatically generates unique identifiers for database table rows by default. But in some cases, you may need to specify an explicit value for the primary key.

To disable automatic primary key generation you can use the following code:

<code class="language-csharp">modelBuilder.Entity<Event>().Property(e => e.EventID).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);</code>

However, when IDENTITY_INSERT is set to OFF, you may encounter an error stating that an explicit value cannot be inserted for the identity column. To resolve this issue, make sure the column is marked [DatabaseGenerated(DatabaseGeneratedOption.None)].

The following is an example of using attributes:

<code class="language-csharp">[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public int EventID { get; set; }</code>

This method also works in EF Core, allowing you to manually specify key values ​​for entities.

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