Invalid Cast Exception

[Lammert]

Good afternoon,

I have a very strange problem. When I execute the code below the
program throws an InvalidCastException. When I debug the code I see
e.Item.DataItem is an object from the type OrganisatieOnderdeel. When
you read the additional you can see the types are the same. How can I
solve this problem?

Kinds regards,
Lammert


Code:
protected void fvwContact_ItemDataBound(object sender,
DataListItemEventArgs e)
{
ObjectDataSource ods = new ObjectDataSource();
ods.TypeName = "BusinessLogicLayer.FunctieVervulling";
ods.SelectMethod = "GetFunctieVervullingenById";

// An exception of type 'System.InvalidCastException' occurred in this
this line:
OrganisatieOnderdeel oo =
(OrganisatieOnderdeel)e.Item.DataItem;

ods.SelectParameters.Add("id", TypeCode.Int32,
oo.Id.ToString());
DataList ds = (DataList)e.Item.FindControl("dlPersonen");
ds.DataSource = ods;
ds.DataBind();
}

Message:
An exception of type 'System.InvalidCastException' occurred in
WebApp.DLL but was not handled in user code

Additional information: Unable to cast object of type
'BusinessLogicLayer.OrganisatieOnderdeel' to type
'BusinessLogicLayer.OrganisatieOnderdeel'.

 

[Lammert]

This doesn't work. When I cast an Object (OrganisatieOnderdeel) to
OrganisatieOnderdeel the program throws an InvalidCastException. For
example e.Item.DataItem contains an Object of the type
OrganisatieOnderdeel, but I can't cast this to OrganisatieOnderdeel!!
Are there any solutions??

Eliyahu Goldin schreef:

 

[Lammert]

Yes, I do!!

Eliyahu Goldin schreef:

Did you check in the debugger that e.Item.DataItem indeed is an object of
the type
OrganisatieOnderdeel?

Eliyahu

 

[Eliyahu Goldin]

Lammert,

You have to filter out all non-data items with something like this:

ListItemType itemType = e.Item.ItemType;

if ((itemType == ListItemType.Pager) ||

(itemType == ListItemType.Header) ||

(itemType == ListItemType.Footer))

{

return;

}



Eliyahu

 

[Eliyahu Goldin]

Did you check in the debugger that e.Item.DataItem indeed is an object of
the type
OrganisatieOnderdeel?

Eliyahu