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LINQ Contains

Posted on 2011-03-16
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Last Modified: 2012-05-11
I have a checkboxlist that works as a filter, I concatenate the values as a comma separated list like here

 protected void Filter_Click(object sender, EventArgs e)
        {
            Collection<string> items = new Collection<string>();
            for (int index = 0; index < FilterWraps.Items.Count; index++)
            {
                if (FilterWraps.Items[index].Selected)
                {
                    items.Add(FilterWraps.Items[index].Value);
                }
            }
            //here you will get selected values
            string selected = String.Join(",", items.ToArray());
            LoadWraps(Take == null ? 10 : Take, Skip == null ? 10 : Skip, selected);
        }


Then on the linq method I do this


private void LoadWraps(int take, int pageSize, string filter)
        {
            Take = take;
            Skip = pageSize;
            using (Entities.EntitiesDataContext dc = new Entities.EntitiesDataContext(SPContext.Current.Site.Url))
            {
                EntityList<Entities.Wrap> wraps = dc.GetList<Entities.Wrap>("Wraps");
                List<Entities.Wrap> listWraps = new List<Entities.Wrap>();
                if (string.IsNullOrEmpty(filter))
                {
                    var wrapsqry = (from row in wraps
                                    where row.ItemLanguage.ToString() == (WebPart.Language == null ? DefaultLanguage : Language)
                                    orderby row.PublicationDate descending
                                    select row).Take(Take).Skip(Skip).ToList();
                    listWraps = (List<Entities.Wrap>)wrapsqry;
                }
                else
                {
                    var wrapsqry = (from row in wraps
                                    where row.ItemLanguage.ToString() == (WebPart.Language == null ? DefaultLanguage : Language)
                                    && row.WrapType.Value.ToString().Contains(filter)
                                    orderby row.PublicationDate descending
                                    select row).Take(Take).Skip(Skip).ToList();
                    listWraps = (List<Entities.Wrap>)wrapsqry;
                }



but the contains is not working. any idea?
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Question by:LuisEstebanValencia
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1 Comment
 
LVL 10

Accepted Solution

by:
Nash2334 earned 2000 total points
ID: 35147563
Your contains is reversed, you are checking if the SP item value contains the filter, not if the filter contains the value:

&& row.WrapType.Value.ToString().Contains(filter)

should be

&& filter.Contains(filterrow.WrapType.Value.ToString())

Also, note that ToList() can become a very expensive operation when thousands of items are involved.  Good luck.
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