How to Disable Auto-Generated Keys in Entity Framework with Manual Key Input?

Override Entity Framework's Auto-Generated Keys with Manual Input

Manually managing primary keys in Entity Framework can present difficulties when trying to suppress the framework's automatic ID generation. This guide addresses this common problem.

The challenge arises when attempting to prevent automatic EventID generation using HasDatabaseGeneratedOption(DatabaseGeneratedOption.None). This often conflicts with the IDENTITY_INSERT setting in SQL Server.

Resolving the Conflict:

To resolve this conflict, enable IDENTITY_INSERT for the relevant table. This allows manual insertion of identity values. Implement this in your DbContext constructor:

<code class="language-csharp">using (var connection = Db.Database.Connection)
{
    var command = connection.CreateCommand();
    command.CommandText = "SET IDENTITY_INSERT Events ON";
    command.ExecuteNonQuery();
}</code>

Attribute-Based Key Configuration:

Alternatively, use attributes for configuration. Apply the following attribute to your EventID property:

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

This approach functions identically in both Entity Framework 6 and Entity Framework Core.

By incorporating these modifications, you can effectively disable automatic primary key generation and manage Event entity values manually.

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