ADO.NET :: LINQ And Cast Row To IEnumerable?
Apr 1, 2011table1 row = _db.table1.FirstOrDefault(r => r.ReferenceID == refNumber);
Is there anyway to cast row to IEnumerable?
((IEnumerable<table1>)row) - does not work
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Cast Ienumerable Into Specified Cast Using Cast?
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public IEnumerable Mthgetcomplaintdate()
{
var v = objderma.USP_Patient_Dermatology_Complaints_RepDate(PatientID); ;
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But on my aspx page i want to display only the Date part not time.One way is i will iterated throgh my dropdownlist which am binding with the above method and i convert it using Toshortdatestring() method.But i want to cast the whole Ienumerable result using some method? I have read about cast<> ,but could not understand how to implement it exactly.
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Oct 21, 2010I am having a lot of the same issue as this poster did with errors on initializing type.
I am trying to learn linq and am about ready to give up - don't get how this is easier...
I'm trying to do a simple update to product names in the product table based on the manufacturer ID
In order to do this I am looping through each record. I was initally successful with changing all names in the column but when I try to query the data, I continually run into multiple problems.
The following poster has had the same issue I have but his solution isn't working for me.
[URL]
I keep getting the same error on the opening bracket on the select statement in the SelectByManufacturerID function...
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The class located in Query.cs...
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May 19, 2010IEnumerable<DataRow> query = (from obj1 in objeDC.tmpPolicyRenewals.AsEnumerable()
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ADO.NET :: Specified Cast Is Not Valid During Using LINQ?
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These are the codes:
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Mar 28, 2011I have a database table called Animals which I drag on to my Linq to SQL DBML file.
This creates me a class called Animal.
I then create a class to extend it, like so:
public partial class Animal{
//my extra code here
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But what I also want to do is have a class like this:
public class Zebra : Animal{
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The trouble is I get an InvalidCastException from my repository, when I do this:
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I've stripped back my classes to the point where they're completely empty in an attempt to work why it doesn't work. To no avail.
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Mar 31, 2010I wanted to delete the record from data but I receive this error "Unable to cast object of type 'System.Data.Linq.DataQuery`1[training_eval.Course]' to type 'training_eval.Course'.
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C# - "Specified Cast Is Not Valid" Error When Saving LINQ-To-SQL Entity?
Jan 26, 2011App Details:
C#, ASP.NET MVC, SQL Server 2008 ( Same version & SP level), Linq-To-SQL ORM
I'm trying to diagnose an exception I'm receiving:
"Specified cast is not valid."
at System.Data.Linq.IdentityManager.StandardIdentityManager.SingleKeyManager2.TryCreateKeyFromValues(Object[] values, V& v)
at System.Data.Linq.IdentityManager.StandardIdentityManager.IdentityCache2.Find(Object[] keyValues)
at System.Data.Linq.IdentityManager.StandardIdentityManager.Find(MetaType type, Object[] keyValues)
at System.Data.Linq.CommonDataServices.GetCachedObject(MetaType type, Object[] keyValues)
at System.Data.Linq.ChangeProcessor.GetOtherItem(MetaAssociation assoc, Object instance)
at System.Data.Linq.ChangeProcessor.BuildEdgeMaps()
at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode)
at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)
at System.Data.Linq.DataContext.SubmitChanges()
at Repository.Save()
at etc....
The problem is that this is occurring only on our servers, not on our local development boxes. I've tracked it down to a single property we're modifying:
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If I comment out that line, everything works fine.
I've tried:
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2 ) Pulling down a copy of the server DB and trying it locally. Works fine.
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5 ) Verifying the datatypes of both columns ( local and remote ) are the same. Also, this column is a FK to another table. I verified that both are of the same data type, down to the collation.
The server is Windows Server 2008 and the local box is Windows 7 x64. Both have all important updates setup.
The only thing I can think of is perhaps since the database and web server are on different boxes that could be an issue? Otherwise, I'm completely stumped.
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...or
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May 1, 2010I am using LINQ for data connectivity and have made class which return me the result set into presentation here is the syntax:-
public List<ClsDermaInvestigation> MthdisplayInvestigation()
{
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//aspx.cs code
List<Dermatology.ClsDermaInvestigation> objlstinvest = objinvest.MthdisplayInvestigation();
//Array s = objlstinvest.to
drpDate.DataSource = s;
drpDate.DataTextField = "Repdate";
drpDate.DataValueField = "Repdate";
drpDate.DataBind();
But it throws an error that list does not conatin a property with "Repdate";. How can i bind this list with dropdownlist?? Can i convert it into some type so that i would be able to bind it??
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