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I have 2 queries. First gets the full name of a committee head if the committee has more that 1 member.

var result = await db.ExpertCommittees
    .Where(f => f.Id == committeeId)
    .Where(f => f.ExpertCommitteeMembers.Count > 1)
    .Select(f => f.ExpertCommitteeMembers
    .Where(m => m.IsCommitteeHead)
    .FirstOrDefault().Expert.FullName)
    .FirstOrDefaultAsync();

The second one gets the full name of the only committee member if the committee has only 1 member

var result2 = await db.ExpertCommittees
    .Where(f => f.Id == committeeId)
    .Where(f => f.ExpertCommitteeMembers.Count == 1)
    .Select(f => f.ExpertCommitteeMembers
    .FirstOrDefault().Expert.FullName)
    .FirstOrDefaultAsync();

Is it possible to check how many members does the committee have and then return the correct name all in the same query? Or do I first have to check how many members does the committee have and then run the appropriate query seperatly?

If I understand correctly you can try to let condition into inner linqwhere

var result = await db.ExpertCommittees
    .Where(f => f.Id == committeeId)
    .Select(f => f.ExpertCommitteeMembers.Where(m => 
                 (m.IsCommitteeHead && 
                 f.ExpertCommitteeMembers.Count > 1)||f.ExpertCommitteeMembers.Count == 1).FirstOrDefault().Expert.FullName)
    .FirstOrDefaultAsync();

C# – LINQ: conditional Where statements – Expert Code Blog, if (condition) { query = query.Where(b => b == "something else"); }. You can use the WhereIf statement method avaialbe in LINQ in this way: The above image represents the collection values, now we're going to filter the income between 25,000 and 40,000 using multiple where conditions, we see this in both the linq and lambda query Linq Query

you can Create a create anonymous object in linq query select. which will contain FullName and count.

var result = await db.ExpertCommittees
    .Where(f => f.Id == committeeId)
    .Where(f => f.ExpertCommitteeMembers.Count > 1)
    .Select(f => new
    {
        FullName = f.ExpertCommitteeMembers
    .Where(m => m.IsCommitteeHead)
    .FirstOrDefault().Expert.FullName,
        Count = f.ExpertCommitteeMembers.Count
    })
    .FirstOrDefaultAsync();

if statements within Linq query?, if textbox is not blank then use contents of textbox else search for blank or NULL. I'm not quite sure how to implement this in a linq to sql� LINQ Where Clause with Query Syntax. We can use a filtering operator where clause in query syntax also to filter list/collection data based on conditions. Following is the syntax of defining where clause with query syntax. C# Code

A generated Join, as it is generated from ExpertCommittees to ExpertCommitteeMembers, with a Navigation-Collection, will always do a Left Join, what you want is an Inner Join. It will give you only items with entities in both tables.

This will be something like

    db.ExpertCommittees.Join(db.ExpertCommittemember, x=>someid, y=>somid, 
          (comittee, member) => new { comittee, member});

But this will give you one line per member.... with the possibility to filter by "IsComitteeHead" or whatever.

You can append Grouping, or use a GroupJoin directly, to have a List of "Commitees", each with a List of it's members ...and only if there are members.

Without knowing the data structure, ID's, Foreign-Keys and table name, we cannot produce a valid query.

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Expression.IfThenElse(Expression, Expression, Expression) Method , Creates a ConditionalExpression that represents a conditional block with if and else C# Copy. public static System.Linq.Expressions.ConditionalExpression The following statement first creates an expression tree, // then compiles it, and� Is it possible to use If Else conditional in a LINQ query? Something like. from p in db.products if p.price>0 select new { Owner=from q in db.Users select q.Name } else select new { Owner = from r in db.ExternalUsers select r.Name }

ConditionalExpression Class (System.Linq.Expressions), Represents an expression that has a conditional operator. C# Copy. // Add the following directive to your file: // using System.Linq.Expressions; int num = 100;� Just to add to the above accepted answer here, if you are doing a dynamic search on a join, consider to return a new object with both tables (t1,t2) in the initial linq query so you can access them individually to do the conditional search. var query = from t1 in _context.Table1 join t2 in _context.Table2 on t1.Table1Id equals t2.Table1IdId

Conditional Where Clause Linq, Observe the rows are using linq to let say show an aggregate or conditions. Pcb by the conditional linq to use a mba from select statement. Forms via email� The following query returns Enumerable of anonymous object that has only StudentName property: Example: LINQ Query returns Collection of Anonymous Objects var teenStudentsName = from s in studentList where s.age > 12 && s.age < 20 select new { StudentName = s.StudentName }; teenStudentsName.ToList().ForEach(s => Console .WriteLine(s.StudentName));

Comments
  • Why m.IsCommitteeHead is not enough? Are there rows where f.ExpertCommitteeMembers.Count == 1 and there is no Head? ... edit: even if you may try order desc by IsCommitteeHead and take first
  • From what I understand, the query doesn't run until called (if(result2.something){}). With that, you can't get a count, you'll have to do .Count(). Sorry if misunderstanding
  • It's possible to be the only person in the committee and not be the committee head
  • Could you provide some sample data and expect result?