我有与需要作为一个“和”操作的匹配滤波器的一组阵列。余的过滤器数组为空应当interpreeted作为包括用于该过滤器的所有内容:LINQ条件和
List<string> cars = new List<string>();
List<string> flights = new List<string>();
flights.Add("Boing");
flights.Add("Airbus");
var transports = new List<Transport>();
var t1 = new Transport("Ford", "Boing");
var t2 = new Transport("BMW", "Boing");
var t3 = new Transport("BMW", "Flights INC");
transports.Add(t1);
transports.Add(t2);
transports.Add(t3);
//returns 0 result. In this scenario I would expect to get all with boing and Airbus and cars excluded from search because its empty
var result = transports.Where(p =>
(cars.Count>0 && cars.Contains(p.CarType)) &&
(flights.Count > 0 && flights.Contains(p.FlightType))).ToList();
cars = new List<string>();
flights = new List<string>();
cars.Add("BMW");
flights.Add("Boing");
IEnumerable<Transport> result2 = transports;
if (cars?.Any() == true)
{
result2 = transports.Where(p => cars.Contains(p.CarType));
}
if (flights?.Any() == true)
{
result2 = transports.Where(p => flights.Contains(p.FlightType));
}
// all rows returned here I only want t2
var r = result2.ToList();
的Rahul引导是在正确的方向。数组不能为null。解决它:
statusViewResult = statusViewResult.Where(p=>
(query.ClustersSelected.Count == 0 || query.ClustersSelected.Contains(p.Cluster)) &&
(query.ParkNamesSelected.Count == 0 || query.ParkNamesSelected.Contains(p.ParkName)));
这和条件意味着你有第{属性名}有一定的价值? right – Ajay2707
如果数组不包含任何值,则Contains将为false。这不是你想要的吗? –
Somethink like this but but working working statusViewResult = statusViewResult.Where(p => (query.ClustersSelected!= null && query.ClustersSelected.Contains(p.Cluster))&& (query.ParkNamesSelected!= null && query.ParkNamesSelected。含有(p.ParkName))); –