CODEWITHSUNDEEP
c#.netlinq
SDC
SDC

Reputation: 249

Accessing Distinct values of List within List for ListView

I have a List "RootObject" that contains another list "Components". So basically each RootObject could have many Components. I need to get all Distinct values out of "Components" to bind to a ListView.

public class RootObject
{
    public string id { get; set; }
    public List<string> Components { get; set; }
    public string name { get; set; }
}

I think I may need to use SelectMany but not sure how to get them... For example I have my root object into

mylist = deserial.Deserialize<List<RootObject>>(response);

This works. I then need to get a list of Components into a ListView

`ListView.DataSource = //get list of Components`

Upvotes: 2

Views: 561

Answers (2)

Olivier Jacot-Descombes
Olivier Jacot-Descombes

Reputation: 112602

This gets the distinct components into a list:

var distinctComponents = rootObjects
    .SelectMany(r => r.Components)
    .Distinct()
    .OrderBy(c => c)
    .ToList();

I don't know which GUI technology you are using, but a winforms ListView has no simple binding mechanism. You need to add items and subitems manually. So, you could also drop the ToList() and enumerate the query directly in a foreach-statement.

Upvotes: 2

Ousmane D.
Ousmane D.

Reputation: 56463

for distinct components, you'll need something like this:

List<RootObject> values = new List<RootObject>(); // assuming this is the collection 
var distinctComponents = values.SelectMany(r => r.Components).Distinct().ToList();

Upvotes: 0

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