[Last Call] Learn about multicloud storage options and how to improve your company's cloud strategy. Register Now

x
?
Solved

Cannot convert from IQueryable to ObjectQuery

Posted on 2013-06-13
17
Medium Priority
?
1,429 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:Meir Rivkin
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
Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

 
LVL 42

Expert Comment

by:Meir Rivkin
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:Meir Rivkin
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:Meir Rivkin
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:Meir Rivkin
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:Meir Rivkin
ID: 39253072
attached what?
0
 

Author Comment

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

Accepted Solution

by:
Meir Rivkin 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:Meir Rivkin
ID: 39253131
u welcome :-)
0

Featured Post

New feature and membership benefit!

New feature! Upgrade and increase expert visibility of your issues with Priority Questions.

Question has a verified solution.

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

This article is for Object-Oriented Programming (OOP) beginners. An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …

650 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