EF LINQ include multiple and nested entities

Question

Ok, I have tri-leveled entities with the following hierarchy: Course -> Module -> Chapter

Here was the original EF LINQ statement:

Course course = db         


        

Answer 1

One may write an extension method like this:

    /// 

    /// Includes an array of navigation properties for the specified query 
    /// 
    /// The type of the entity
    /// The query to include navigation properties for that
    /// The array of navigation properties to include
    /// 
    public static IQueryable Include(this IQueryable query, params string[] navProperties)
        where T : class
    {
        foreach (var navProperty in navProperties)
            query = query.Include(navProperty);

        return query;
    }

And use it like this even in a generic implementation:

string[] includedNavigationProperties = new string[] { "NavProp1.SubNavProp", "NavProp2" };

var query = context.Set()
.Include(includedNavigationProperties);