EF6 Lazy Loading not working for a navigation property

问题

I've got 2 new entities in an otherwise working app, I've trimmed unrelated properties (everything is marked virtual):

QuoteOverrideRequest

public virtual int RequestedById { get; set; }
public virtual int QuoteId { get; set; }
public virtual int StatusId { get; set; }

//nav properties
public virtual Customer RequestedBy { get; set; }
public virtual Quote Quote { get; set; }
public virtual QuoteOverrideRequestStatus Status { get; set; }

All 3 navigation properties are mapped the same way. When I create a new QuoteOverrideRequest and insert it, RequestedBy and Quote are auto populated with their entities. Status is not.

QuoteOverrideRequest request = new QuoteOverrideRequest();
request.QuoteId = quoteId;
request.RequestedById = _workContext.CurrentCustomer.Id;
request.StatusId = 1;

_quoteService.InsertOverrideRequest(request);

The insert function is calling a Repository that adds the object to a DbSet and calls the DbContext.SaveChanges()

I assume the problem is with QuoteOverrideRequestStatus because the other 2 classes lazy load correctly. If I get an instance of that Status earlier in the function, it will show up in the Status property after the insert.

The QuoteOverrideRequestStatus class has a public parameterless constructor and all of it's properties are virtual.

public partial class QuoteOverrideRequestStatus : BaseEntity
{
    public QuoteOverrideRequestStatus() { }

    public virtual string Name { get; set; }
    public virtual int DisplayOrder { get; set; }
}

BaseEntity has the Id property. I've confirmed that Lazy Loading and Proxy Generation are both true on the DbContext when all this runs.

回答1:

new QuoteOverrideRequest()

This is not correct. Lazy loading won't work for properties of models you instantiate using the new keyword.

You should use db.Set<T>().Create() where db is your instance of DbContext and T is your model.

This will instantiate the correct proxy object of your model which will enable lazy-loading navigation properties.

来源：https://stackoverflow.com/questions/32747947/ef6-lazy-loading-not-working-for-a-navigation-property