Solved

How to display selected columns from datatable using LINQ

Posted on 2010-09-09
3
639 Views
Last Modified: 2013-12-17
I am passing datatable instance to the dataadapter to fetch the resultset from database.the datatable default it doesn't any schema.

Datatable dt = new DataTable();

datadapter da = new dataadapter();

da.fill(dt);

               var fundsReceiptsbatchids = (from batchids in dt.AsEnumerable()
                                            select new
                                            {
                                                FUNDS_RECEIPT_BATCH_ID =
                                                    batchids.Field<int>("FUNDS_RECEIPT_BATCH_ID")
                                            }).ToList();

when i try to excute this LINQ query, I am getting an expection like
Specified cast is not valid.

I have question in  LINQ query  in select block I am assigning datatable column value
(i.e batchids.Field<int>("FUNDS_RECEIPT_BATCH_ID"))  to this field FUNDS_RECEIPT_BATCH_ID. i didn't mention this FUNDS_RECEIPT_BATCH_ID field in my class or anywhere.

Actually FUNDS_RECEIPT_BATCH_ID is a one of the column in my resultset, which i am fetching from database using dataadapter.

How to get the selected columns from datatable using LINQ?

0
Comment
Question by:kravindra
  • 2
3 Comments
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 33640575
Hi kravindra;

To your question, "I have question in  LINQ query  in select block I am assigning datatable column value
(i.e batchids.Field<int>("FUNDS_RECEIPT_BATCH_ID"))  to this field FUNDS_RECEIPT_BATCH_ID. i didn't mention this FUNDS_RECEIPT_BATCH_ID field in my class or anywhere. Actually FUNDS_RECEIPT_BATCH_ID is a one of the column in my resultset, which i am fetching from database using dataadapter.", the runtime will type it so this is not an issue.

Make sure that the field FUNDS_RECEIPT_BATCH_ID in the datatbase is truely an int and not something else.

Fernando
0
 

Author Comment

by:kravindra
ID: 33640712
We are using Oracle database. the type FUNDS_RECEIPT_BATCH_ID is NUMBER.
0
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 33640962
The datatype NUMBER in Oracle gets translated to Decimal in .Net. See the .Net documentation for Datatype mapping.

Oracle Data Type Mappings
http://msdn.microsoft.com/en-us/library/yk72thhd.aspx
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

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

It seems a simple enough task, yet I see repeated questions asking how to do it: how to pass data between two forms. In this article, I will show you the different mechanisms available for you to do just that. This article is directed towards the .N…
A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…

856 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