Asp.net mvc, modifying SelectList

Question

I'm trying to write simple extension method for SelectList. API confuses me.

public static SelectList Without(this SelectList selectList,int val){
  //return new SelectList(selectList.Items.Where(x=>x.Value!=val)); <-----???
}

It should return new select list with same items w/o one which value matches argument val.

Could you expand on which bit of your method is not working? — Mark Robinson
– Mark Robinson, Commented Mar 14, 2011 at 9:29
@Mark selectList.Items.Where(x=>x.Value!=val) because Items.GetType==typeof(IEnumerable) — Arnis Lapsa
– Arnis Lapsa, Commented Mar 14, 2011 at 9:32

ipodtouch0218 · Accepted Answer · 2025-04-08 16:52:06Z

1

 public static class SelectListExtensions{
    public static SelectList Without(this SelectList selectList,params int[] what){
      var items=selectList.Items.Cast<SelectListItem>()
        .Where(x=>!what.Any(z=>int.Parse(x.Value)==z)).ToList();
      return new SelectList(items);
    }
    public static SelectList Without<T>(this SelectList selectList,params T[] what) where T:Enumeration{
      var items=selectList.Items.Cast<SelectListItem>()
        .Where(x=>!what.Any(z=>int.Parse(x.Value)==z.Value)).ToList();
      return new SelectList(items);
    }
  }

Only problem is - it assumes that Items will always contain IEnumerable<SelectListItem>.

Will be fine for me.

edited Apr 8 at 16:52

ipodtouch0218

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answered Mar 14, 2011 at 9:38

Arnis Lapsa

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Comments

Mark Robinson · Accepted Answer · 2011-03-14 09:35:04Z

0

Do you just need to apply a ToArray() to your IEnumerable collection??

return new SelectList(selectList.Items.Where(x=>x.Value!=val).ToArray());

answered Mar 14, 2011 at 9:35

Mark Robinson

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2 Comments

Arnis Lapsa Over a year ago

Nope. Commented below my question. Problem is that Items is collection from objects. x does not have Value.

Mark Robinson Over a year ago

@Arnis. Ah, okay. Disregard my answer then. I have voted up your answer instead.

shallowsp · Accepted Answer · 2011-03-14 21:08:52Z

0

return new SelectList(selectList.Items.Cast<T>().Except(what));

edited Mar 14, 2011 at 21:08

answered Mar 14, 2011 at 21:03

shallowsp

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