c# - List Grouping on multiple fields -

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• grouping in linq ( on multiple fields) 1 answer

i have list of type contains 5 fields. list wish retrieve values groups issuetype & id together. in table below issuetype abc & id = 2 appears once in new list. how do this?

i should point out issuetype enumeration. not sure if makes difference

issuetype    id abc          1 abc          2 abc          2 abc          3 xzy          4 xyz          1 

i have tried using groupby in linq.

list<issuelog> uniqueerrorlog = errorlog.groupby(err => err.issuetype, err => err.id).select(err => err).tolist(); 

update

ok have since tried line below.

 var uniqueerrorlog = errorlog.groupby(iss => new { iss.issuetype, iss.id }); 

i check output , grouping seems have made no difference. going table example can still see 2 abc's id = 2 being output when want one.

 foreach (var issuetype in uniqueerrorlog)             {                 foreach(var issue in issuetype)                     console.writeline(issue.issuetype + "," + issue.id);                                 } 

mylist.groupby(e => string.format("{0}_{1}", e.issuetype, e.id))