How to compare one list single item with another list items in C# linq?

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Hi Guys,

I have two lists.

one list is for center where i have cities(ID's) as item(separated by commas).

another list is for session where i have only city(ID) as item.

now i want to compare session city with center cities.

session will have only one city, like: hyd.

Where,
Center will have cities, like: Delhi, Mumbai, Hyd...

i want to compare session where session-city == center-city

What I have tried:

i tried using contains, findall, where, select...

SessionController.Instance.All.FindAll(
item => 
item.ProgramID == programId && /* Resource Path : Program */
//item.SectorID.Contains(item.SectorID) && /* Resource Path : Sector */
//item.CenterGroup.CenterIDs.Split(',').ToList().Contains(center.ID.ToString())
item.CityID==cityIds)//error.
Select(item => new { id = item.ID, value = item.NameEN })

plz guys, help me, how can i compare.

Thanks

Posted 19-Sep-16 2:03am

abdul subhan mohammed

Updated 19-Sep-16 5:06am

v2

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Comments

Karthik_Mahalingam 19-Sep-16 8:04am

what is cityIds? and item.CityID

abdul subhan mohammed 19-Sep-16 10:19am

cityid contains list of city id's and where item.cityid contain single cityid

Maciej Los 19-Sep-16 11:00am

What kind of data is CityId (int? string?)?

2 solutions

Solution 2

Based on example provided by OriginalGriff[^], i'd share another solution, which uses Where + Any Linq methods:

var found = session
    .Where(s => centers
        .SelectMany(c => c.Split(new char[]{','}, StringSplitOptions.RemoveEmptyEntries))
        .Any(z=>z==s));

In case when CityId is type of Int, you need to convert splited string to integer:

.Any(z=>Convert.ToInt32(z)==s));

For further details, please see:
String.Split Method (Char[], StringSplitOptions) (System)[^]
How to: Parse Strings Using String.Split (C# Programming Guide)[^]
Enumerable.Any(TSource) Method (IEnumerable(TSource), Func(TSource, Boolean)) (System.Linq)[^]

Posted 19-Sep-16 5:06am

Maciej Los

Updated 19-Sep-16 5:07am

v2

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OriginalGriff · Accepted Answer · 2016-09-19T02:19:00

If you mean something like:

C#

List<string> centers = new List<string>();
centers.Add("123,456,789");
centers.Add("666,333,999");
List<string> session = new List<string>();
session.Add("456");
session.Add("666");
session.Add("888");

Then try:

C#

var found = session.Where(s => centers.Where(c => c.Split(',').Contains(s)).Count() != 0);