EF Core 数据库优先 HasNoKey

Question

I have a database table created 20 years ago in my company, it is only used for journaling, with NO PRIMARY KEY or INDEX. I can't alter that table.

I understood that we need to call HasNoKey() in code first approach.

But how can I apply HasNoKey in this case? Since it is a Database First approach.

Answer 1

In your DbContext class' OnModelCreating method, you do something like this:

modelBuilder
    .Entity<MyEntity>(builder =>
    {
        builder.HasNoKey();
        builder.ToTable("MY_ENTITY");
    });

Read more about it here:
https://docs.microsoft.com/en-us/ef/core/modeling/keyless-entity-types?tabs=fluent-api

Answer 2

Use [Keyless] Attribute of model class.