Question

I need an extention for converting ToSelectList a list of items (strings or ints)

I found this:

        public static SelectList ToSelectList<T>(this IEnumerable<T> collection,
                            string dataValueField, string dataTextField, string selectedValue)
    {
        return new SelectList(collection, dataValueField, dataTextField, selectedValue);
    }

but this doesn’t handle multiple selected values.
I tried with this:

        public static SelectList ToSelectList<T>(this IEnumerable<T> collection,
                    string dataValueField, string dataTextField, IEnumerable<T> selectedValues)
    {
        var list = new SelectList(collection, dataValueField, dataTextField, selectedValues);
        return list;
    }

but it doesn’t work.
please help!

Answer 1

I haven’t tested it but try this:

public static SelectList ToSelectList<T>(
    this IEnumerable<T>      collection,
         string              dataValueField, 
         string              dataTextField,          
         IEnumerable<string> selectedValues)
{
    var list = new SelectList(collection, dataValueField, dataTextField);
    foreach (var item in list.Items)
    {
        if (selectedValues.Contains(item.Value)
        {
            item.Selected = true;
        }
    }
    return list;
}