?
Solved

Cannot convert from IQueryable to ObjectQuery

Posted on 2013-06-13
17
Medium Priority
?
1,386 Views
Last Modified: 2013-06-24
Hi guys,

I am getting the above error (Cannot convert from System.Linq.IQueryable to System.Data.Objects.ObjectQuery)

My auto generated code is...

 System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload> bomDataUploadsQuery = bOM_Entities.BomDataUploads;
return bomDataUploadsQuery;

Open in new window


I was trying to add a where clause. So used..

return bomDataUploadsQuery.Where(c=>c.Manufacturer.Contains("Random Text String"));

Open in new window


Why am I getting this error and what is the solution?

Many Thanks,
Dean
0
Comment
Question by:deanlee17
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 9
  • 8
17 Comments
 
LVL 42

Expert Comment

by:sedgwick
ID: 39244113
ObjectQuery<T> inherits IQueryable<T> so why do u want to return resuts as ObjectQuery?
0
 

Author Comment

by:deanlee17
ID: 39244195
I was just working with the auto generated code (slightly modified)....

System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload> bomDataUploadsQuery = bOM_Entities.BomDataUploads;

return bomDataUploadsQuery;

 context = new Ascent_ERP.BOM_Entities();
            // Load data into BomDataUploads. You can modify this code as needed.
            System.Windows.Data.CollectionViewSource bomDataUploadsViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("bomDataUploadsViewSource")));
            System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload> bomDataUploadsQuery = this.GetBomDataUploadsQuery(context);
            bomDataUploadsViewSource.Source = bomDataUploadsQuery.Execute(System.Data.Objects.MergeOption.AppendOnly);

Open in new window

0
 

Author Comment

by:deanlee17
ID: 39252511
anybody?
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 
LVL 42

Expert Comment

by:sedgwick
ID: 39252517
can u post the whole function?
0
 

Author Comment

by:deanlee17
ID: 39252645
private void LoadBomRetrieve()
        {
            context = new Ascent_ERP.BOM_Entities();
            // Load data into BomDataUploads. You can modify this code as needed.
            System.Windows.Data.CollectionViewSource bomDataUploadsViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("bomDataUploadsViewSource")));
            System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload> bomDataUploadsQuery = this.GetBomDataUploadsQuery(context);
            bomDataUploadsViewSource.Source = bomDataUploadsQuery.Execute(System.Data.Objects.MergeOption.AppendOnly);
        }


  private System.Data.Objects.ObjectQuery<BomDataUpload> GetBomDataUploadsQuery(BOM_Entities bOM_Entities)
        {

		System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload> bomDataUploadsQuery = bOM_Entities.BomDataUploads;
                return bomDataUploadsQuery;
        }

Open in new window

0
 
LVL 42

Expert Comment

by:sedgwick
ID: 39252651
which line triggers the conversion error?
0
 

Author Comment

by:deanlee17
ID: 39252655
Ive given you the original code, I want a WHERE clause on bomDataUploadsQuery (that gets a value from a combobox). Forget the code I was trying to use before. Start fresh.
0
 
LVL 42

Expert Comment

by:sedgwick
ID: 39252670
change GetBomDataUploadsQuery to:

private IQueryable<BomDataUpload> GetBomDataUploadsQuery(BOM_Entities bOM_Entities)
        {

		System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload> bomDataUploadsQuery = bOM_Entities.BomDataUploads;
                return bomDataUploadsQuery.Where(c=>c.Manufacturer.Contains("Random Text String"));;
        }

Open in new window

0
 

Author Comment

by:deanlee17
ID: 39252738
Cannot implicitly convert type 'System.Linq.IQueryable<Ascent_ERP.BomDataUpload>' to 'System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload>'. An explicit conversion exists (are you missing a cast?)
0
 
LVL 42

Expert Comment

by:sedgwick
ID: 39252775
private IQueryable<BomDataUpload> GetBomDataUploadsQuery(BOM_Entities bOM_Entities)
        {

		System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload> bomDataUploadsQuery = bOM_Entities.BomDataUploads;
                return (IQueryable<BomDataUpload>)bomDataUploadsQuery.Where(c=>c.Manufacturer.Contains("Random Text String"));;
        }

Open in new window

0
 

Author Comment

by:deanlee17
ID: 39252958
Attached
0
 
LVL 42

Expert Comment

by:sedgwick
ID: 39253072
attached what?
0
 

Author Comment

by:deanlee17
ID: 39253089
Sorry my mistake....
error.png
0
 
LVL 42

Accepted Solution

by:
sedgwick earned 2000 total points
ID: 39253098
u didn't change the function declaration return type:
private IQueryable<BomDataUpload> GetBomDataUploadsQuery(BOM_Entities bOM_Entities)
        {

		System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload> bomDataUploadsQuery = bOM_Entities.BomDataUploads;
                return bomDataUploadsQuery.Where(c=>c.Manufacturer.Contains("Random Text String"));;
        }

Open in new window

0
 

Author Comment

by:deanlee17
ID: 39253117
Think ive got it...

return (System.Data.Objects.ObjectQuery<Ascent_ERP.BomDataUpload>)bomDataUploadsQuery.Where(c => c.Manufacturer.Contains("66"));

Open in new window

0
 

Author Comment

by:deanlee17
ID: 39253121
AH my mistake!!

Perfect thanks
0
 
LVL 42

Expert Comment

by:sedgwick
ID: 39253131
u welcome :-)
0

Featured Post

How To Reduce Deployment Times With Pre-Baked AMIs

Even if we can't include all the files in the base image, we can sometimes include some of the larger files that we would otherwise have to download, and we can also sometimes remove the most time-consuming steps. This can help a lot with reducing deployment times.

Question has a verified solution.

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

More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
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 …
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
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…
Suggested Courses

764 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