public IEnumerable <DisplayItem> GetTopCountries(TweetStorageSelectBy countType = TweetStorageSelectBy.All, int max = 10)
{
lock (_items) {
var res = (from item in _items
where SelectPredicate(countType)(item) && item.Country != TweetStorageItem.UnknownCountry
group item by item.Country into grp
orderby grp.Count() descending
select new DisplayItem {
Name = grp.Key, Value = grp.Count()
}).Take(max);
return(res.ToList());
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SelectPredicateAttribute"/> class.
/// </summary>
/// <param name="selectPredicate">The select predicate.</param>
/// <param name="parameter">The parameter.</param>
public SelectPredicateAttribute(SelectPredicate selectPredicate, int parameter)
{
if (selectPredicate == SelectPredicate.Distinct)
{
throw new ArgumentException("Invalid SelectPredicateAttribute initialization; Optional parameter only to be specified with a TOP or TOP_PERCENT select predicate!");
}
this.Predicate = selectPredicate;
this.PredicateParameter = parameter;
}
public override string ToString()
{
var oDataQueryParts = new List <string>(10)
{
FormatPredicate.ToString()
};
if (CountPredicate != null)
{
oDataQueryParts.Add(CountPredicate.ToString());
}
if (ExpandPredicate != null)
{
oDataQueryParts.Add(ExpandPredicate.ToString());
}
if (FilterPredicate != null)
{
oDataQueryParts.Add(FilterPredicate.ToString());
}
if (OrderByPredicate != null)
{
oDataQueryParts.Add(OrderByPredicate.ToString());
}
if (SelectPredicate != null)
{
oDataQueryParts.Add(SelectPredicate.ToString());
}
if (SkipPredicate != null)
{
oDataQueryParts.Add(SkipPredicate.ToString());
}
if (SkipTokenPredicate != null)
{
oDataQueryParts.Add(SkipTokenPredicate.ToString());
}
if (TopPredicate != null)
{
oDataQueryParts.Add(TopPredicate.ToString());
}
if (InlineCountPredicate != null)
{
oDataQueryParts.Add(InlineCountPredicate.ToString());
}
return($"?{String.Join("&", oDataQueryParts)}");
}
public static IEnumerable <TOut?> SelectWhere <TIn, TOut>(this IEnumerable <TIn?> source,
SelectPredicate <TIn?, TOut?> selectWhere)
{
foreach (TIn?value in source)
{
if (selectWhere(value, out TOut? result))
{
yield return(result);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SelectPredicateAttribute"/> class.
/// </summary>
/// <param name="selectPredicate">The select predicate.</param>
public SelectPredicateAttribute(SelectPredicate selectPredicate)
{
this.Predicate = selectPredicate;
}
