/// <summary>
/// Write the given GeoJSON it to the given file.
/// </summary>
/// <param name="GeoJSONTask">A GeoJSON task.</param>
/// <param name="FilenameBuilder">A file name.</param>
public static Task <IEnumerable <JObject> > ToGeoJSONFileAsync(this Task <IEnumerable <JObject> > GeoJSONTask,
Func <JObject, String> FilenameBuilder)
{
return(GeoJSONTask.ContinueWith(GeoJSONTasks => GeoJSONTasks.Result.Select(GeoJSON => GeoJSON.ToFile(FilenameBuilder))));
}