Are you sure that the keys of entities in Added state have been set?

[mauler2025]

According to the documentation,

keys are set as soon as entities are tracked by the context, even if the entity is in the Added state.

In the following code, I found the claim is not correct.
Right before SaveChangeAsync() is invoked but after AddAsync() is invoked, the entity is in Added state and the IsKeySet is False (rather than True as the documentation claims). It means the key has not been set yet.

private static async Task<IResult> Add(StudentEnrollmentDbContext ctx, Course course, ILogger<Program> logger)
{
    var added = await ctx.Courses.AddAsync(course);
    logger.LogError(added.Entity.Id.ToString()); // output: 0
    logger.LogError(added.State.ToString()); // output: Added
    logger.LogError(added.IsKeySet.ToString()); // output: False
    await ctx.SaveChangesAsync();
    logger.LogError("=========================");
    logger.LogError(added.Entity.Id.ToString()); // output: 1006
    logger.LogError(added.State.ToString()); // output: Unchanged
    logger.LogError(added.IsKeySet.ToString()); // output: True
    return Results.CreatedAtRoute(nameof(Get), new { id = added.Entity.Id }, added.Entity);
}

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Document Details

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• ID: b9826f28-46b2-e845-f1bf-5cbc2d940208
• Version Independent ID: 9c4a46cf-daa2-0e14-7ff1-c195db237cd0
• Content: Disconnected Entities - EF Core
• Content Source: entity-framework/core/saving/disconnected-entities.md
• Product: entity-framework
• Technology: entity-framework-core
• GitHub Login: @ajcvickers
• Microsoft Alias: avickers

[ajcvickers]

The docs need updating for this change: https://docs.microsoft.com/en-us/ef/core/what-is-new/ef-core-3.x/breaking-changes#tkv