internal static string ListItemToOption(GroupedSelectListItem item)
{
var tagBuilder = new TagBuilder("option")
{
InnerHtml = HttpUtility.HtmlEncode(item.Text)
};
if (item.Value != null)
{
tagBuilder.Attributes["value"] = item.Value;
}
if (item.Selected)
{
tagBuilder.Attributes["selected"] = "selected";
}
return(tagBuilder.ToString(TagRenderMode.Normal));
}
private static MvcHtmlString SelectInternal(this HtmlHelper htmlHelper, string optionLabel, string name, IEnumerable <GroupedSelectListItem> selectList, bool allowMultiple, IDictionary <string, object> htmlAttributes)
{
name = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
if (string.IsNullOrEmpty(name))
{
throw new ArgumentException("Null Or Empty", nameof(name));
}
var flag1 = false;
if (selectList == null)
{
selectList = htmlHelper.GetSelectData(name);
flag1 = true;
}
var obj = allowMultiple ? htmlHelper.GetModelStateValue(name, typeof(string[])) : htmlHelper.GetModelStateValue(name, typeof(string));
if (!flag1 && obj == null)
{
obj = htmlHelper.ViewData.Eval(name);
}
if (obj != null)
{
IEnumerable source;
if (!allowMultiple)
{
source = new object[1]
{
obj
}
}
;
else
{
source = obj as IEnumerable;
}
var hashSet = new HashSet <string>(source.Cast <object>().Select(value => Convert.ToString(value, CultureInfo.CurrentCulture)), StringComparer.OrdinalIgnoreCase);
var list = new List <GroupedSelectListItem>();
foreach (var groupedSelectListItem in selectList)
{
groupedSelectListItem.Selected = groupedSelectListItem.Value != null?hashSet.Contains(groupedSelectListItem.Value) : hashSet.Contains(groupedSelectListItem.Text);
list.Add(groupedSelectListItem);
}
selectList = list;
}
var stringBuilder1 = new StringBuilder();
if (optionLabel != null)
{
var stringBuilder2 = stringBuilder1;
var groupedSelectListItem = new GroupedSelectListItem
{
Text = optionLabel,
Value = string.Empty,
Selected = false
};
var str = ListItemToOption(groupedSelectListItem);
stringBuilder2.AppendLine(str);
}
using (var enumerator = selectList.GroupBy(i => i.GroupKey).GetEnumerator())
{
while (enumerator.MoveNext())
{
var group = enumerator.Current;
var str = selectList.Where(i => i.GroupKey == @group.Key).Select(it => it.GroupName).FirstOrDefault();
var flag2 = selectList.Where(i => i.GroupKey == @group.Key).Select(it => it.Disabled).FirstOrDefault();
stringBuilder1.AppendLine(string.Format(@"<optgroup label=""{0}"" value=""{1}"" {2}>", str, @group.Key, flag2 ? "disabled" : ""));
foreach (var groupedSelectListItem in @group)
{
stringBuilder1.AppendLine(ListItemToOption(groupedSelectListItem));
}
stringBuilder1.AppendLine("</optgroup>");
}
}
var tagBuilder = new TagBuilder("select")
{
InnerHtml = stringBuilder1.ToString()
};
tagBuilder.MergeAttributes(htmlAttributes);
tagBuilder.MergeAttribute("name", name, true);
tagBuilder.GenerateId(name);
if (allowMultiple)
{
tagBuilder.MergeAttribute("multiple", "multiple");
}
ModelState modelState;
if (htmlHelper.ViewData.ModelState.TryGetValue(name, out modelState) && modelState.Errors.Count > 0)
{
tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
}
return(MvcHtmlString.Create(tagBuilder.ToString()));
}