private static MvcHtmlString DateTimePickerHelper(HtmlHelper htmlHelper, ModelMetadata metadata,
string name, DateTimeCategory category, CustomizeDateTimePicker customize,
IDictionary <string, object> htmlAttributes)
{
string fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
if (string.IsNullOrEmpty(fullName))
{
throw new ArgumentNullException("name");
}
var value = metadata == null
? TpoHtmlHelper.GetModelStateValue(htmlHelper.ViewContext, fullName, typeof(object))
: metadata.Model;
var datePickerIndentity = "div_" + Guid.NewGuid( ).ToString( ).Replace("-", "").Substring(0, 7);
var divTag = GenerateDateTimePickerDiv(htmlHelper, datePickerIndentity, name, value, category,
customize ?? new CustomizeDateTimePicker(), htmlAttributes);
return(new MvcHtmlString(divTag));
}
// Unable to constrain TEnum. Cannot include IComparable, IConvertible, IFormattable because Nullable<T> does
// not implement those interfaces (and Int32 does). Enum alone is not compatible with expression restrictions
// because that requires a cast from all enum types. And the struct generic constraint disallows passing a
// Nullable<T> expression.
public static MvcHtmlString EnumDropDownListFor <TModel, TEnum>(this HtmlHelper <TModel> htmlHelper,
Expression <Func <TModel, TEnum> > expression, string optionLabel, IDictionary <string, object> htmlAttributes)
{
if (expression == null)
{
throw new ArgumentException("expression");
}
ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
if (metadata == null)
{
throw new ArgumentException(
string.Format(CultureInfo.CurrentCulture, "Unable to determine ModelMetadata for expression '{0}'.",
expression.ToString()), "expression");
}
if (metadata.ModelType == null)
{
throw new ArgumentException(
string.Format(CultureInfo.CurrentCulture, "Unable to determine type of expression '{0}'.",
expression.ToString()), "expression");
}
if (!TpoEnumHelper.IsValidForEnumHelper(metadata.ModelType))
{
string formatString;
if (TpoEnumHelper.HasFlags(metadata.ModelType))
{
formatString = "Return type '{0}' is not supported. Type must not have a '{1}' attribute.";
}
else
{
formatString = "Return type '{0}' is not supported.";
}
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, formatString, metadata.ModelType.FullName, "Flags"), "expression");
}
// Run through same processing as SelectInternal() to determine selected value and ensure it is included
// in the select list.
string expressionName = ExpressionHelper.GetExpressionText(expression);
string expressionFullName =
htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(expressionName);
Enum currentValue = null;
if (!String.IsNullOrEmpty(expressionFullName))
{
currentValue = TpoHtmlHelper.GetModelStateValue(htmlHelper.ViewContext, expressionFullName, metadata.ModelType) as Enum;
}
if (currentValue == null && !String.IsNullOrEmpty(expressionName))
{
// Ignore any select list (enumerable with this name) in the view data
currentValue = htmlHelper.ViewData.Eval(expressionName) as Enum;
}
if (currentValue == null)
{
currentValue = metadata.Model as Enum;
}
IList <SelectListItem> selectList = TpoEnumHelper.GetSelectList(metadata.ModelType, currentValue);
if (!String.IsNullOrEmpty(optionLabel) && selectList.Count != 0 && String.IsNullOrEmpty(selectList[0].Text))
{
// Were given an optionLabel and the select list has a blank initial slot. Combine.
selectList[0].Text = optionLabel;
// Use the option label just once; don't pass it down the lower-level helpers.
optionLabel = null;
}
return(htmlHelper.DropDownListFor(expression, selectList, optionLabel, htmlAttributes));
}
