How to get the following result in C#

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I have 3 views V1,V2,V3 i added them as entities in my web application. There is "login_name" common field in all and i need to get the below result.

C#

LoginName  | SoldCount[V1field]|PurchasedCount[V2 field]|ThroughCount[V3 Field]
==================================================================================
abcd       |  20               | 12                     | 0
gefg       |  10               | 00                     | 3
sdff       |  00               | 36                     | 1
ewre       |  30               | 00                     | 0
.          |  ..               | ..                     | .

Posted 25-Jan-15 0:31am

shaprpuff

Updated 25-Jan-15 0:39am

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Kornfeld Eliyahu Peter 25-Jan-15 6:42am

Why not use SQL with JOIN to build a 4th view? SQL after all is much better with data than LINQ...

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Wendelius · Answer 1 · 2015-01-25T00:46:00

Solution 1

Depending how the data in the views is organized could be something like following in SQL

SQL

SELECT v1.LoginName,
       v1.SoldCount,
       v2.PurchaseCount,
       v3.ThroughCount
FROM v1
     inner join v2 on v1.LoginName = v2.LoginName
     inner join v3 on v1.LoginName = v3.LoginName

or if you're doing it in LINQ then perhaps something like

C#

var query =
    from v1row in v1
    join v2row in v2 on v1row.LoginName equals v2row.LoginName
    join v3row in v3 on v1row.LoginName equals v3row.LoginName
    select new {
       LoginName = v1row.LoginName,
       SoldCount = v1row.SoldCount,
       PurchaseCount = v2row.PurchaseCount,
       ThroughCount = v3row.ThroughCount
    }

Posted 25-Jan-15 0:46am

Wendelius

Comments

shaprpuff 25-Jan-15 7:00am

ERROR, DbExpressionBinding requires an input expression with a collection ResultType.
Parameter name: input

i need to count,

LoginName = v1row.LoginName,
SoldCount = v1row.SoldCount.Count(),
PurchaseCount = v2row.PurchaseCount.Count(),
ThroughCount = v3row.ThroughCount.Count()

Wendelius 25-Jan-15 7:16am

If you need to do the counting in LINQ then you need to use GROUP BY clause. Have a look at How to: Group Query Results[^]

shaprpuff 26-Jan-15 1:48am

still not get result

Wendelius 26-Jan-15 8:34am

Can you post what your code currently looks like

shaprpuff 27-Jan-15 0:41am

i have tried the same,

var query =
from v1row in v1
join v2row in v2 on v1row.LoginName equals v2row.LoginName
join v3row in v3 on v1row.LoginName equals v3row.LoginName
select new {
LoginName = v1row.LoginName,
SoldCount = v1row.SoldCount.COunt(),
PurchaseCount = v2row.PurchaseCount.Count(),
ThroughCount = v3row.ThroughCount.Count()
}

Wendelius 27-Jan-15 0:45am

Few things. You need to add the group by clause. Have a look at the link I posted earlier.

Another thing. What does SoldCount field contain. Is it already containing the count or do you need to sum the values in that field?

shaprpuff 26-Jan-15 2:02am

Anybody please Help