Question

Consider:

class Foo
{
    public string Name{get;set;}
    public string[] WebSites{get;set;}
}

I have a query:

var allFoo=db.Persons.Select(p=>new Foo()
{
    Name=p.Name,
    WebSites=p.WebSites.Select(q=>q.Caption).ToArray(),
}).ToList();

But i get error ” LINQ to Entities does not recognize the method ‘System.String[] ToArray… “.

How to i get All foo and websites string in a array with linq to entities?

Answer 1

Something like this should work:

var allFooAnon = db.Persons.Select(p => new
{
  Name = p.Name,
  Websites = p.Websites.Select(q => q.Caption)
});

var list = new List<Foo>();
foreach (var anon in allFooAnon)
{
  list.Add(new Foo
  {
    Name = anon.Name,
    Websites = anon.Websites.ToArray()
  });
}

This creates a collection of anonymously-typed objects to hold the results of the query. You can then iterate over those objects to create your collection of Foo.