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IEnumerable and string array - find matching values

Background: I have an ASP.NET MVC view page with a MultiSelectList in the view model. I want to populate a label with a SelectedValues ​​list from this MultiSelectList object. The list is stored in a MultiSelectList with the IDName type:

public class IDName {
    public int ID {get; set;}
    public string Name {get; set;}
}

So MultiSelectList.Items is an IEnumerable containing a list of IDName. I can foreach over this list and grab the .Name to get the name of each entry. But I only want to do this if the ID is in MultiSelectList.SelectedItems, which looks like a string [] and looks like this:

["1", "3", "4"]

So, I just want to get IDName.Name when IDName.ID is in the SelectedItems list.

I'm new to both MVC and C #, so I'm not sure if this is the best way to do it. Any suggestions?

Update # 2:

Okay, I was tight. It works:

list.Items
  .Cast<IDName>()
  .Where(x => list.SelectedValues.Cast<string>().Contains(x.ID.ToString()))

SelectedValues ​​is actually an IEnumerable containing the string [].

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2 answers


Try the following.

var selected = MultiSelectList.Items
  .Cast<IDName>()
  .Where(x => MultiSelectList.SelectedItems.Contains(x.Name));


What this means is to process all items in the MultiSelectList.Items collection. It will then list all of them into a strongly typed instance of IDName. The where clause will filter the collection only on items where the Name field matches an entry in the SelectedItems array.

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You can use LINQ to filter list

against ids

.



list.Where(item => ids.Contains(item.Id.ToString())).Select(item => item.Name)
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