CODEWITHSUNDEEP
c#asp.net-mvc-4genericstype-conversion
O Aprendiz
O Aprendiz

Reputation: 55

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<string>' to 'System.Collections.Generic.ICollection<x>'

I have this model with three collections of the same model <AttendeesMeeting>

Meeting

[NotMapped]
[Display(Name = "xxxx", ResourceType = typeof(Resources.ReuniaoResources))]
public virtual ICollection<AttendeesMeeting> Required{ get; set; }

[NotMapped]
[Display(Name = "xxx", ResourceType = typeof(Resources.ReuniaoResources))]
public virtual ICollection<AttendeesMeeting> Informed{ get; set; }

[NotMapped]
[Display(Name = "xxxx", ResourceType = typeof(Resources.ReuniaoResources))]
public virtual ICollection<AttendeesMeeting> Optionals{ get; set; }

In a method do a get to retrieve some values.

I'd like three of my model objects only receive the 'Login' from the returned values.

public Meeting GetReuniaoForEdit(int id)
{
    var model = this.context.Meetings.Find(id);

    var required = context.AttendeesMeeting.Where(x => x.IdReuniao == id && x.TypeAttendee == 1);
    var informed = context.AttendeesMeeting.Where(x => x.IdReuniao == id && x.TypeAttendee == 2);
    var optionals = context.AttendeesMeeting.Where(x => x.IdReuniao == id && x.TypeAttendee == 3);

    if (required.Any() || informed.Any() || optionals.Any())
    {
        //Login is a string
        model.required = required.Select(x => x.Login).ToList();
    }
}

Error: 

model.required = required.Select(x => x.Login).ToList();

Cannot implicitly convert type 'System.Collections.Generic.List<string>' to 'System.Collections.Generic.ICollection<Models.AttendeesMeeting>'. An explicit conversion exists (are you missing a cast?)

How do I turn the string list in a collection of my model?

It's possible?

Upvotes: 1

Views: 3360

Answers (2)

Markus
Markus

Reputation: 22421

Right now, by .Select(x => x.Login).ToList() you create a list of strings that you want to assign to a ICollection<AttendeesMeeting>. You can solve this in several ways, for instance:

  • You can change the model, so that ICollection<AttendeesMeeting> is substituted by ICollection<string>. If you ever only need the Login, then your model should be optimized for that.
  • You can leave out .Select(x => x.Login) and by that assign the collection of meetings to the property in the model; in your view, you only show the Login property of the model and leave out the rest of the data.
  • If you cannot change the existing model, I'd propose to create a new model class that stores exactly the data you need in the special case. In this case, you'd add the properties as ICollection<string> to the new model and use this in the special case.

Upvotes: 2

MakePeaceGreatAgain
MakePeaceGreatAgain

Reputation: 37000

I guess what you want is get the meetings by their login. Thus you need a further step as required.Select(x => x.Login).ToList() will only select the logins of your meetings. However you need to further select all those meetings that fit those IDs:

var model = this.context.Meetings.Where(x => required.Select(y => y.Login).Contains(x.login));

Upvotes: 0

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