I re-write my question. Maybe it will be easy for somebody to help me.
BooksEntities be =
new BooksEntities();
using (var context =
new BooksEntities())
{
var contextWhere = context.tblBooks;
if (lbCategory.SelectedIndex != 0)
{
contextWhere = contextWhere.Where(x => x.TypeID == 5);
}
}
It gives an error in the line
contextWhere = contextWhere.Where(x => x.TypeID == 5);
Error: Cannot implicitly convert type System.Linq.IQueryable to System.Data.ObjectSet. An explicit conversion exists (are you missing a cast?)
What is wrong? Any suggestions?.
Thank you.
OkyToky
It was previous edition of this question:
Code below works, but lines 11-16 and 21-26 are the same.
1 private void lbCategory_SelectionChanged(object sender, SelectionChangedEventArgs e)
2
{
3
ocBook = new ObservableCollection<BookClass>();
4
ocBook.Clear();
5
BooksEntities be = new BooksEntities();
6
using (var context = new BooksEntities())
7
{
8
if (lbCategory.SelectedIndex == 0)
9
{
10
var contextWhere = context.tblBooks;
11
foreach (var book in contextWhere)
12
{
13
int ID = book.ID;
14
string BookName = book.BookName;
15
ocBook.Add(new BookClass(ID, BookName));
16
}
17
}
18
else
19
{
20
var contextWhere = context.tblBooks.Where(x => x.TypeID == 5);
21
foreach (var book in contextWhere)
22
{
23
int ID = book.ID;
24
string BookName = book.BookName;
25
ocBook.Add(new BookClass(ID, BookName));
26
}
27
}
I want to re-write code to have one foreach block.
1 private void lbCategory_SelectionChanged(object sender, SelectionChangedEventArgs e)
2
{
3
ocBook = new ObservableCollection<BookClass>();
4
ocBook.Clear();
5
BooksEntities be = new BooksEntities();
6
using (var context = new BooksEntities())
7
{
8
var contextWhere = context.tblBooks;
9
if (lbCategory.SelectedIndex != 0)
10
{
11
contextWhere = contextWhere.Where(x => x.TypeID == 5);
12
}
13
foreach (var book in contextWhere)
14
{
15
int ID = book.ID;
16
string BookName = book.BookName;
17
ocBook.Add(new BookClass(ID, BookName));
18
}
19
}
It gives an error on Line 11.
Error: Cannot implicitly convert type System.Linq.IQueryable to System.Data.ObjectSet. An explicit conversion exists (are you missing a cast?)
What is wrong? Any suggestions are highly appreciated.
Thank you.
OkyToky
Oak
