public virtual IEnumerable <SelectListItem> GetFilterOptions <T, TValue>(IGridColumn <T, TValue> column)
{
List <SelectListItem> options = new List <SelectListItem>();
Type type = Nullable.GetUnderlyingType(typeof(TValue)) ?? typeof(TValue);
if (type == typeof(Boolean))
{
options.Add(new SelectListItem {
Value = "", Text = BooleanEmptyOptionText?.Invoke()
});
options.Add(new SelectListItem {
Value = "true", Text = BooleanTrueOptionText?.Invoke()
});
options.Add(new SelectListItem {
Value = "false", Text = BooleanFalseOptionText?.Invoke()
});
}
else if (type.GetTypeInfo().IsEnum)
{
options.Add(new SelectListItem());
options.AddRange(EnumHelper.GetSelectList(type));
}
return(options);
}
public virtual IEnumerable <SelectListItem> OptionsFor <T, TValue>(IGridColumn <T, TValue> column)
{
Type?type = GetElementType(typeof(TValue)) ?? typeof(TValue);
List <SelectListItem> options = new List <SelectListItem>();
type = Nullable.GetUnderlyingType(type) ?? type;
if (type == typeof(Boolean))
{
options.Add(new SelectListItem {
Value = "", Text = BooleanEmptyOptionText?.Invoke()
});
options.Add(new SelectListItem {
Value = "true", Text = BooleanTrueOptionText?.Invoke()
});
options.Add(new SelectListItem {
Value = "false", Text = BooleanFalseOptionText?.Invoke()
});
}
else if (type.IsEnum)
{
options.Add(new SelectListItem());
IEnumerable <SelectListItem>?items = column.Grid
.ViewContext?
.HttpContext
.RequestServices
.GetRequiredService <IHtmlHelper>()
.GetEnumSelectList(type)
.OrderBy(item => item.Text);
if (items != null)
{
options.AddRange(items);
}
}
return(options);
}
