Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Selecting columns from two tables using linq

Posted on 2013-07-01
6
Medium Priority
?
843 Views
Last Modified: 2013-07-02
I am trying to do a join on two dattables and select columns from the two tables

 var result = from dataRows1 in infocodesDT.AsEnumerable()
                          join dataRows2 in mqDT.AsEnumerable()
                          on dataRows1["Code"] equals dataRows2["Code"]
                          select new DataRow  { dataRows1["Code"] ,dataRows1["Desc"],  dataRows2["BusDate"] , dataRows2["Price"]};

Gives me the foll error

.Data.DataRow.DataRow(System.Data.DataRowBuilder)' is inaccessible due to its protection level
0
Comment
Question by:countrymeister
  • 3
  • 2
6 Comments
 
LVL 64

Expert Comment

by:Fernando Soto
ID: 39289798
Hi  countrymeister;
0
 
LVL 42

Expert Comment

by:Meir Rivkin
ID: 39289800
you can't create dynamic DataRow cause it bound to schema.
here u try to create new schema joined from two tables.
so what u want to do is this:

var result = from dataRows1 in amenity.AsEnumerable()
                         join dataRows2 in hotelDetails.AsEnumerable()
                         on dataRows1["Code"] equals dataRows2["Code"]
                         select new { code = dataRows1["Code"], desc = dataRows1["Desc"], busDate = dataRows2["BusDate"], price = dataRows2["Price"] };

Open in new window

0
 
LVL 64

Expert Comment

by:Fernando Soto
ID: 39289806
Hi  countrymeister;

According to Microsoft documentation DataRoad and DataRowBuilder are for internal use only. What you may want to do is to extract the data from each row and then build a new table with the results.
0
Learn Veeam advantages over legacy backup

Every day, more and more legacy backup customers switch to Veeam. Technologies designed for the client-server era cannot restore any IT service running in the hybrid cloud within seconds. Learn top Veeam advantages over legacy backup and get Veeam for the price of your renewal

 
LVL 42

Expert Comment

by:Meir Rivkin
ID: 39289811
this code create the joined table first, then use NewRow.ItemArray to file the properties from both tables:
            DataTable joinedTable = new DataTable();
            joinedTable.Columns.Add("Code");
            joinedTable.Columns.Add("Desc");
            joinedTable.Columns.Add("BusDate");
            joinedTable.Columns.Add("Price");
            
            var result = from dataRows1 in amenity.AsEnumerable()
                         join dataRows2 in hotelDetails.AsEnumerable()
                         on dataRows1["Code"] equals dataRows2["Code"]
                         select joinedTable.NewRow().ItemArray = new object[]{
                             dataRows1["Code"],
                             dataRows1["Desc"],
                             dataRows2["BusDate"], 
                             dataRows2["Price"] };

Open in new window

0
 
LVL 1

Author Comment

by:countrymeister
ID: 39289909
sedqwick

I need to get the var result into a datatable, so int the second example, will the result populate the datatable.

Your first example works but I need the var result to a datatable
0
 
LVL 42

Accepted Solution

by:
Meir Rivkin earned 2000 total points
ID: 39289963
here:
            DataTable joinedTable = new DataTable();
            joinedTable.Columns.Add("Code");
            joinedTable.Columns.Add("Desc");
            joinedTable.Columns.Add("BusDate");
            joinedTable.Columns.Add("Price");

            var result = from dataRows1 in amenity.AsEnumerable()
                         join dataRows2 in hotelDetails.AsEnumerable()
                         on dataRows1["Code"] equals dataRows2["Code"]
                         select joinedTable.NewRow().ItemArray = new object[]{
                             dataRows1["Code"],
                             dataRows1["Desc"],
                             dataRows2["BusDate"], 
                             dataRows2["Price"] };
            foreach (var row in result)
            {
                joinedTable.Rows.Add(row);
            }

Open in new window

0

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
How to fix incompatible JVM issue while installing Eclipse While installing Eclipse in windows, got one error like above and unable to proceed with the installation. This video describes how to successfully install Eclipse. How to solve incompa…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …

885 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question