Select all columns but group by only one in linq,How to Get only Id from Lookup field in LINQ

Question

Greetings

I am using Sharepoint 2016 on Prem

I want to Select all columns but apply "group by" only one using LINQ ( retrieve data from Sharepoint list )

Problem : Currently having 2 problems/challenges

Problem 1: I have lookup field which returns id with name like "23;#abcd" , for this I have to split to get Id only ( mention in below code using split(';').

Problem 2: in LINQ query ,I want to select stautus and documentname columns from list not on "group by".
Group by is just for 1 column like we do in sql server like below

select id,stautus ,documentname,comments from abc groupby userFk

My Code:
oQuery.Query = "<Where><Eq><FieldRef Name='Flag'/><Value Type ='number'>" + 1 + "</Value></Eq></Where> ";

var resultfoldeDoc11 = (from SPListItem itm in pLis.GetItems(oQuery)
orderby itm["ID"]
group itm by new { m_folderID22 = itm["DocumentFolderFk"] } into g
select new { m_folderId22 = g.Key.m_folderID22.ToString().Split(';'), m_totaldocsfoldercount = g.Count() });

Solution Required:for Both Problem
How can I select multiple columns in select clause with one field in "Groupby " Clause ?
How can I get only ID from Look up field in LINQ

Thanks

Answer 1

Hi @Mohammad Qasim ,

Change code like this:

oQuery.Query = "<Where><Eq><FieldRef Name='Flag'/><Value Type ='number'>" + 1 + "</Value></Eq></Where> ";  
  
  
var resultfoldeDoc11 = (from SPListItem itm in pLis.GetItems(oQuery)  
orderby itm["ID"]  
group itm by new { m_folderID22 = itm["DocumentFolderFk"] } into g  
select new { m_folderId22 = g.Key.m_folderID22.ToString().Split(new char[] { ';', '#' })[0], m_totaldocsfoldercount = g.Count(), ListItemsData = g });  
  
 foreach (var oitem in resultfoldeDoc11)  
 {  
          Console.WriteLine($"{oitem.m_folderId22}:{oitem.Total}");  
          foreach (var item in oitem.ListItemsData)  
          {  
            //OutPut Other Columns here  
			Console.WriteLine(item["Title"]);  
          }  
 }  

ListItemsData = g will output the ListItem Collection object, then you can get any other fields using item["ColumnInternalName"] like the code sample above.

Reference:

Group By SPListItem in SharePoint ListItemCollection

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