How to add item to IEnumerable SelectListItem
I am trying to add an item to an IEnumerable SelectList. I have an initial query that populates my list, after which I have a query to check if an item named INFORMATION exists. If not, I need to add it to the list returned from my original request. Here is my code. He doesn't like list.Add (newItem). Any help would be appreciated. Thanks to
public IEnumerable<SelectListItem> GetCategoriesByAccountID(string AccountID)
{
IEnumerable<SelectListItem> list = null;
using (var context = new AMPEntities())
{
// Queries DB for list of categories by AccountID
var query = (from ca in context.CustomAlerts
where ca.AccountID == AccountID
orderby ca.AlertCategory
select new SelectListItem { Text = ca.AlertCategory, Value = ca.AlertCategory }).Distinct();
list = query.ToList();
// Checks list to see if "INFORMATIONAL" already exists
var item = (from l in list
where l.Value == "INFORMATIONAL"
select new SelectListItem { Text = l.Text, Value = l.Value }).FirstOrDefault();
// If "INFORMATIONAL" is not present add it to list
if (item == null)
{
var newItem = new SelectListItem { Text = "INFORMATIONAL", Value = "INFORMATIONAL" };
list.Add(newItem);
}
}
return list;
}
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3 answers
The problem is that your variable is of type IEnumerable<SelectListItem>
. Either change it to List<SelectListItem>
or use a different variable.
public IEnumerable<SelectListItem> GetCategoriesByAccountID(string AccountID)
{
List<SelectListItem> list = null;
using (var context = new AMPEntities())
{
// Queries DB for list of categories by AccountID
var query = (from ca in context.CustomAlerts
where ca.AccountID == AccountID
orderby ca.AlertCategory
select new SelectListItem { Text = ca.AlertCategory, Value = ca.AlertCategory }).Distinct();
list = query.ToList();
// Checks list to see if "INFORMATIONAL" already exists
var item = (from l in list
where l.Value == "INFORMATIONAL"
select new SelectListItem { Text = l.Text, Value = l.Value }).FirstOrDefault();
// If "INFORMATIONAL" is not present add it to list
if (item == null)
{
var newItem = new SelectListItem { Text = "INFORMATIONAL", Value = "INFORMATIONAL" };
list.Add(newItem);
}
}
return list;
}
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Here is what I came up with that might help someone. Perhaps even I am at a later date. Take a look at the last line of code.
CostCenterHeaders CostHeaders = CostCenterHeaders.GetCostCenterHeaders(ClientNumber);
List<SelectListItem> Level1Header = new List<SelectListItem>();
if (CostHeaders.Level1Heading !=null)
{
Level1Header.Add(new SelectListItem { Text = "All " + CostHeaders.Level1Heading + " Centers", Value = "" });
List<HierarchyLevel> HierarchyLevels = HierarchyLevel.GetHierarchyByLevel(ClientNumber);
Level1Header.AddRange(HierarchyLevels.Select(x => new SelectListItem() { Value = x.LevelID, Text = x.LevelDescr }).ToList());
}
0
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