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Cannot convert from IQueryable to ObjectQuery

Posted on 2013-06-13
17
1,324 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;

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

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

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

Many Thanks,
Dean
0
Comment
Question by:deanlee17
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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);

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0
 

Author Comment

by:deanlee17
ID: 39252511
anybody?
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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;
        }

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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"));;
        }

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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"));;
        }

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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 500 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"));;
        }

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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"));

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0
 

Author Comment

by:deanlee17
ID: 39253121
AH my mistake!!

Perfect thanks
0
 
LVL 42

Expert Comment

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

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