How to convert foreach statement into LINQ in C#?

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Hi guys,

i want to convert foreach statement into LINQ in C#...

i have one list that is: CandidateGroups, in this list, i have one more list, that is
canidiatelist.

Here, i'm fetching all candidategroups and then comparing candidategroup.candidatelist.id with current candidiate.ID.

Using 'foreach' i got, but i want to convert this foreach statement to LINQ.

What I have tried:

code

public string GroupNameAR
        {
            get
            {
                string GroupName = "";
                List[CandidateGroupInfo] CandidateGroups = CandidateGroupController.Instance.All;//i have used '[]' instead of '<>', to view code,here.
                foreach(var group in CandidateGroups)
                {
                    foreach (var candidate in group.CandidateList)
                    {
                        if (candidate.ID == ID)
                        {
                            GroupName = group.NameAR;
                        }
                    }
                }
                return GroupName != ""? GroupName.ToUpper() : null;                                               
            }
        }

Posted 4-Oct-16 21:32pm

abdul subhan mohammed

Updated 4-Oct-16 23:23pm

v6

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F-ES Sitecore · Answer 1 · 2016-10-04T23:23:00

C#

int ID = 202;
string GroupName = string.Empty;

List<CandidateGroupInfo> CandidateGroups = new List<CandidateGroupInfo> {
    new CandidateGroupInfo{NameAR = "A", CandidateList = new List<CandidateList> { new CandidateList{ID=101}, new CandidateList{ID=102}}},
    new CandidateGroupInfo{NameAR = "B", CandidateList = new List<CandidateList> { new CandidateList{ID=201}, new CandidateList{ID=202}}},
    new CandidateGroupInfo{NameAR = "C", CandidateList = new List<CandidateList> { new CandidateList{ID=301}, new CandidateList{ID=302}}}
    };

foreach(var group in CandidateGroups)
{
    foreach (var candidate in group.CandidateList)
    {
        if (candidate.ID == ID)
        {
            GroupName = group.NameAR;
            // you should add a break as the data is found so no need
            // to continue processing in the loop
            break;
        }
    }
    // again we want to break the outer loop is the data
    // has been found
    if (!string.IsNullOrWhiteSpace(GroupName))
    {
        break;
    }
}
Console.WriteLine(GroupName != ""? GroupName.ToUpper() : null);

// now via Linq

GroupName = string.Empty;

CandidateGroupInfo info = CandidateGroups.FirstOrDefault(cg => cg.CandidateList.Any(cl => cl.ID == ID));

GroupName = info == null ? string.Empty : info.NameAR.ToUpper();

Karthik_Mahalingam · Answer 2 · 2016-10-04T21:46:00

Solution 1

try

C#

var temp  = CandidateGroups.FirstOrDefault(k => k.CandidateList.Any(a => a.ID == ID));
           GroupName = temp != null ? temp.NameAR.ToUpper() : null;

Posted 4-Oct-16 21:46pm

Karthik_Mahalingam

Updated 4-Oct-16 21:48pm

v2

Comments

abdul subhan mohammed 5-Oct-16 4:17am

Error: does not contain a definition for FirstOrDefault

abdul subhan mohammed 5-Oct-16 4:17am

tried with find, findAll.. also

Karthik_Mahalingam 5-Oct-16 4:19am

add this

using System.Linq;

Maciej Los 5-Oct-16 15:40pm

Looks perfect!