private static MvcHtmlString selectListFor <TPageModel, TProperty, TSourceDataModel>
(
HtmlHelper <TPageModel> html,
Expression <Func <TPageModel, TProperty> > propertyExpression,
Expression <Func <TPageModel, TSourceDataModel> > sourceEntityExpression,
string bindValuePropertyName,
string bindTextPropertyName,
Expression <Func <TSourceDataModel, bool> > filter,
Func <IQueryable <TSourceDataModel>, IOrderedQueryable <TSourceDataModel> > orderBy,
bool insertDefaultOption,
string defaultOptionText,
string defaultOptionValue
) where TSourceDataModel : class
{
PropertyInfo valueProperty = SelectListHelper.GetSelectListValuePropertyInfo(typeof(TSourceDataModel), bindValuePropertyName);
PropertyInfo textProperty = SelectListHelper.GetSelectListTextPropertyInfo(typeof(TSourceDataModel), bindTextPropertyName);
ModelMetadata metadata = ModelMetadata.FromLambdaExpression <TPageModel, TProperty>(propertyExpression, html.ViewData);
string value = (metadata.Model == null ? "0" : metadata.Model.ToString());
List <SelectListItem> list = SelectListHelper.GetSelectListItems <TSourceDataModel>(valueProperty, textProperty, value, filter, orderBy);
if (insertDefaultOption)
{
list.Insert(0, new SelectListItem {
Text = defaultOptionText, Value = defaultOptionValue
});
}
return(html.DropDownListFor(propertyExpression, list));
}
