Question

id’like to count how many documents a User edited or created. Therefore I have a Datatable which contains the information sth. like this:

Input
DocumentName | ModifiedBy | CreatedBy
 a              Frank         Frank
 b              Mike          Frank
 c              John          Mike

That should be the Output:

Name   DocumentsModified(Total)  DocumentsCreated(Total)
Frank      1                        2
Mike       1                        1
John       1                        0

So what it did to count all documents a person edited, is the following

var query = from queryResult in resultTable.AsEnumerable()
group queryResult by queryResult.Field<string>("ModifiedBy") into rowGroup
select new 
{
    Name = rowGroup.Key, ModifiedDocuments = rowGroup.Count()
};

This works fine. Now i have to count also the values of the column “Creator”. Is this possible and if so, how would i do that? OK, i could iterate over the table, but it would be nice to accomplish this in the LinQ query.

I tried to use “group queryResult by new {}” but i’m not sure if i’m on the right track.

Answer 1

You’re best bet would be to just query for created and modified separately and then combine the results with a join.

var modifiedCount = from queryResult in resultTable.AsEnumerable()
group queryResult by queryResult.Field<string>("ModifiedBy") into rowGroup
select new 
{
    Name = rowGroup.Key, ModifiedDocuments = rowGroup.Count()
};

var createdCount = from queryResult in resultTable.AsEnumerable()
group queryResult by queryResult.Field<string>("CreatedBy") into rowGroup
select new 
{
    Name = rowGroup.Key, CreatedDocuments = rowGroup.Count()
};

var finalResult = from first in modifiedCount 
                  join second in createdCount
                  on first.Name equal second.Name
                  select new 
                  {
                     first.Name,
                     first.ModifiedDocuments,
                     second.CreatedDocuments 
                  };