public static IList <SelectListItem> GetEnumList <T>()
{
return(EnumHelper.GetSelectList(typeof(T)));
}
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 Error.ArgumentNull("expression");
}
ModelMetadata metadata = ModelMetadata.FromLambdaExpression(
expression,
htmlHelper.ViewData
);
if (metadata == null)
{
throw Error.Argument(
"expression",
MvcResources.SelectExtensions_InvalidExpressionParameterNoMetadata,
expression.ToString()
);
}
if (metadata.ModelType == null)
{
throw Error.Argument(
"expression",
MvcResources.SelectExtensions_InvalidExpressionParameterNoModelType,
expression.ToString()
);
}
if (!EnumHelper.IsValidForEnumHelper(metadata.ModelType))
{
string formatString;
if (EnumHelper.HasFlags(metadata.ModelType))
{
formatString =
MvcResources.SelectExtensions_InvalidExpressionParameterTypeHasFlags;
}
else
{
formatString = MvcResources.SelectExtensions_InvalidExpressionParameterType;
}
throw Error.Argument(
"expression",
formatString,
metadata.ModelType.FullName,
"Flags"
);
}
// 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 =
htmlHelper.GetModelStateValue(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 = EnumHelper.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(DropDownListHelper(
htmlHelper,
metadata,
expressionName,
selectList,
optionLabel,
htmlAttributes
));
}
