CODEWITHSUNDEEP
c#asp.net-mvcentity-frameworkentity-framework-6
secretAgentB
secretAgentB

Reputation: 1279

Entity Framework Include() returns null navigational property

I am having issue with the Include function. I have a Team class that has an Owner property of type Owner. I have a helper function that wraps my EF calls like below;

public Task<List<T>> GetManyAsync(
    Expression<Func<T, bool>> filter = null,
    Expression<Func<T, object>> includeProperties = null)
{
    IQueryable<T> query = _dbSet;

    if (filter != null)
    {
        query = query.Where(filter);
    }

    if (InstanceHelper.IsSomething(includeProperties))
    {
        query.Include(includeProperties);
    }

    return query.ToListAsync();
}

And I use it like this

var teams = await DataAccess.Team.GetManyAsync(e => e.Owner.Id == userId, e => e.Owner);

But it returns the list of Teams with a NULL Owner property. Any idea what I am missing here?

Upvotes: 4

Views: 2128

Answers (1)

M.Azad
M.Azad

Reputation: 3763

You must use from this 

public Task<List<T>> GetManyAsync(Expression<Func<T, bool>> filter = null, params Expression<Func<T, object>>[] includeProperties = null)
{
  foreach (var prop in includeProperties)
  query = query.Include(prop);
  ...
}

And you can have multiple includes

GetManyAsync(filter ,p => p.prop1 ,p.prop2,...)

Upvotes: 2

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