Use LINQ to Sum a Single Column when selecting multiple columns: C#, LINQ

Use LINQ to Sum a Single Column when selecting multiple columns

Let's say i have this query in SQL

Select InstNumber, AccountNumber, Sum(Amount) from Items..

How do i replicate that in LINQ?

I'm tried this below example and i can select the sum column, but cannot select my individual columns. I get the error "Cannot assign lambda expression to anonoymous type property.

See attached code for example

var tmpItem = (from item in Items
               group item by Item.Amount into g
               select new
               {
                 InstNumber = (item => item.InstNumber)
                 AccountNumber = (item => item.AccountNumber)
                 SumAmount = g.Sum(item=> item.Amount)
               }

1:
2:
3:
4:
5:
6:
7:
8:

Select all Open in new window

Instant Access to this Solution

Plus...

30 Day FREE access, no risk, no obligation

Collaborate with the world's top tech experts

Unlimited access to our exclusive solution database

Never be left without tech help again

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

"The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.

"Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin

"Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

var groupTest = (from item in Items group item by new { item.InstNumber, item.LogicalAccount} into g select new { InstNumber = g.Key.InstNumber, Account = g.Key.LogicalAccount, FloatAmount = g.Sum(item => item.LogicalAmount) } );

Hi jpmc_cmsops;

To your statement, "Well, the SQL Statement is complete, however, i think that it implies some grouping", The SQL statement in the question, "Select InstNumber, AccountNumber, Sum(Amount) from Items", would cause an error in SQL Server because the SUM function requires an aggregate function or the GROUP BY clause which is not stated. For example the following would work:

SELECT InstNumber, AccountNumber, Sum(Amount)
FROM Items
GROUP BY InstNumber, AccountNumber

This Ling to SQL query in your last post will send the following T-SQL statement to the SQL Server.
var groupTest = (from item in Items
group item by
new { item.InstNumber, item.LogicalAccount} into g
select new
{
InstNumber = g.Key.InstNumber,
Account = g.Key.LogicalAccount,
FloatAmount = g.Sum(item => item.LogicalAmount)
}
);

T-SQL statement sent to the server.
SELECT SUM([t0].[LogicalAmount]) AS [FloatAmount], [t0].[InstNumber] AS [InstNumber],
[t0].[LogicalAccount] AS [Account]
FROM [dbo].[Items] AS [t0]
GROUP BY [t0].[InstNumber], [t0].[LogicalAccount]

Which will return the same result set as the T-SQL statement above. You can always see what is sent to SQL server by placing the following statement before executing a Linq query.

TheDataContextInstanceName.Log = Console.Out;

In the above the T-SQL statement will be written to the Console window.

Fernando

Question

Use LINQ to Sum a Single Column when selecting multiple columns

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

C#

LINQ

.NET Framework 3.x versions

Language Integrated Query - LINQ

Microsoft Visual C#.Net

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Need individual assistance?

Our experts are ready to help.

Want to learn from the best?

Read articles from industry experts.

Working on a long term project?

Store your work and research.

What Makes Experts Exchange Unique?

Trusted by the world's most respected brands.

Faithfully serving IT professionals since 1996.

Related Solutions

Free Tech Articles

Cloud Class Webinars

Join the Community

Give a Little. Get a Lot.

Answers

3 Ways to Join

The Experts

The Experts

Testimonials

Testimonials

Testimonials

Business Clients

Business Clients

In the Press

In the Press

In the Press