如何将默认值添加到RadComboBox？

Question

我想在我的WCF服务中添加一个额外的项目.这是我的代码.我有一个代码从数据库中获取值.我想将默认项"All"添加到数组中.这是我的WCF代码.

RadComboBoxData result = new RadComboBoxData();
var listView = new listTypedView();

//In case the user typed something - filter the result set
string text = String.Concat("%", context.Text, "%");
if (!String.IsNullOrEmpty(text))
{
    using (DataAccessAdapter adapter = LLBLGenAdapterUtility.GetAdapter())
    {
        RelationPredicateBucket filter = new RelationPredicateBucket();
        filter.PredicateExpression.Add(ViewNameFields.Name % text);
        adapter.FetchTypedView(personView.GetFieldsInfo(), listView, filter, 0, null, false);
    }
}

var allList = from n in listView
                  select new RadComboBoxItemData
                  {
                      Text = n.pName,
                      Value = n.Id.ToString()
                  };
result.Items = allList.ToArray();

Answer 1

你在找这样的东西吗？

result.Items = (new List<RadComboBoxItemData> 
  { 
    new RadComboBoxItemData { Text = "All", Value = "" }
  }).Concat(allList).ToArray();