private static string ConstructXmlFromDropDownItems(ListItemCollection dropdownitems, string outerTagName, string innerTagName)
{
var outerOpenTag = string.Format("<{0}>", outerTagName);
var outerCloseTag = string.Format("</{0}>", outerTagName);
var innerOpenTag = string.Format("<{0}>", innerTagName);
var innerCloseTag = string.Format("</{0}>", innerTagName);
var xml = outerOpenTag;
foreach (string itemIdString in dropdownitems.OfType <ListItem>().Where(x => x.Selected).Select(x => x.Value.Split(',')[0]))
{
var itemID = int.Parse(itemIdString.Substring(itemIdString.IndexOf('=') + 1));
xml += innerOpenTag;
xml += "<id>" + itemID + "</id>";
xml += innerCloseTag;
}
xml += outerCloseTag;
return(xml);
}
private void RenderContentsAutoGrouped(HtmlTextWriter writer)
{
if (HttpContext.Current == null)
{
return;
}
ListItemCollection items = this.Items;
int count = items.Count;
var groupedItems = items.OfType <ListItem>().GroupBy(x => x.Attributes["Group"] ?? String.Empty).Select(x => new { Group = x.Key, Items = x.ToList() });
if (count > 0)
{
Boolean flag = false;
foreach (var groupedItem in groupedItems)
{
if (string.IsNullOrEmpty(groupedItem.Group) == false)
{
writer.WriteBeginTag("optgroup");
writer.WriteAttribute("label", groupedItem.Group);
writer.Write('>');
}
for (int i = 0; i < groupedItem.Items.Count; ++i)
{
ListItem item = groupedItem.Items[i];
if (item.Enabled == true)
{
writer.WriteBeginTag("option");
if (item.Selected == true)
{
if (flag == true)
{
this.VerifyMultiSelect();
}
flag = true;
writer.WriteAttribute("selected", "selected");
}
writer.WriteAttribute("value", item.Value, true);
if (item.Attributes.Count != 0)
{
item.Attributes.Render(writer);
}
if (this.Page != null)
{
this.Page.ClientScript.RegisterForEventValidation(this.UniqueID, item.Value);
}
writer.Write(Html32TextWriter.TagRightChar);
if (htmlEncodeItems)
{
HttpUtility.HtmlEncode(item.Text, writer);
}
else if (htmlAttributeEncodeItems)
{
HttpUtility.HtmlAttributeEncode(item.Text, writer);
}
else
{
writer.Write(item.Text);
}
writer.WriteEndTag("option");
writer.WriteLine();
}
}
if (string.IsNullOrEmpty(groupedItem.Group) == false)
{
writer.WriteEndTag("optgroup");
}
}
}
}
public static IEnumerable <ListItem> GetSelectedItems(this ListItemCollection items)
{
return(items.OfType <ListItem>().Where(item => item.Selected));
}
protected override void RenderContents(System.Web.UI.HtmlTextWriter writer)
{
// The current control being "adaptered" is available within context from the Control property
DropDownList dropDownList = (DropDownList)Control;
ListItemCollection items = dropDownList.Items;
// Retrieve Optgrouping using LinQ
var groups = (from p in items.OfType <ListItem>()
group p by p.Attributes["Group"] into g
select new { Label = g.Key, Items = g.ToList <ListItem>() });
foreach (var group in groups)
{
if (!String.IsNullOrEmpty(group.Label))
{
writer.WriteBeginTag("optgroup");
writer.WriteAttribute("label", group.Label);
writer.Write(">");
}
int count = group.Items.Count();
if (count > 0)
{
bool flag = false;
for (int i = 0; i < count; i++)
{
ListItem item = group.Items[i];
writer.WriteBeginTag("option");
if (item.Selected)
{
if (flag)
{
throw new HttpException("Multiple selected items not allowed");
}
flag = true;
writer.WriteAttribute("selected", "selected");
}
if (!item.Enabled)
{
writer.WriteAttribute("disabled", "true");
}
writer.WriteAttribute("value", item.Value, true);
if (this.Page != null)
{
this.Page.ClientScript.RegisterForEventValidation(dropDownList.UniqueID, item.Value);
}
writer.Write('>');
HttpUtility.HtmlEncode(item.Text, writer);
writer.WriteEndTag("option");
writer.WriteLine();
}
}
if (!String.IsNullOrEmpty(group.Label))
{
writer.WriteEndTag("optgroup");
}
}
}
protected override void RenderContents(HtmlTextWriter writer)
{
ListItemCollection items = this.Items;
Int32 count = items.Count;
var groupedItems = items.OfType <ListItem>().GroupBy(x => x.Attributes["Group"] ?? String.Empty).Select(x => new { Group = x.Key, Items = x.ToList() });
if (count > 0)
{
Boolean flag = false;
foreach (var groupedItem in groupedItems)
{
if (String.IsNullOrWhiteSpace(groupedItem.Group) == false)
{
writer.WriteBeginTag("optgroup");
writer.WriteAttribute("label", groupedItem.Group);
writer.Write('>');
}
for (Int32 i = 0; i < groupedItem.Items.Count; ++i)
{
ListItem item = groupedItem.Items[i];
if (item.Enabled == true)
{
writer.WriteBeginTag("option");
if (item.Selected == true)
{
if (flag == true)
{
this.VerifyMultiSelect();
}
flag = true;
writer.WriteAttribute("selected", "selected");
}
writer.WriteAttribute("value", item.Value, true);
if (item.Attributes.Count != 0)
{
item.Attributes.Render(writer);
}
if (this.Page != null)
{
this.Page.ClientScript.RegisterForEventValidation(this.UniqueID, item.Value);
}
writer.Write('>');
HttpUtility.HtmlEncode(item.Text, writer);
writer.WriteEndTag("option");
writer.WriteLine();
}
}
if (String.IsNullOrWhiteSpace(groupedItem.Group) == false)
{
writer.WriteEndTag("optgroup");
}
}
}
}