Searching within a collection of objects (List)

Question

1.00/5 (1 vote)

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I would like to search through a list of objects, however, the code editor does not allow me to use this list from the code within an .aspx file.

Is there an alternative manner of searching through a hierarchy of objects that contain static lists of their members as part of a collection?

BooksAndMediaOnLoan.cs
----------------------
public static List<BooksAndMediaOnLoan> BooksAndMediaOnLoanToCustomers = new List<BooksAndMediaOnLoan>();


customermanagementpage.aspx
---------------------------
protected void Button1_Click(object sender, EventArgs e)
    {
        //search within Media, Books and Customers
        
    }

References:
1. www.dotnetperls.com/list-find - Use find method on list within C#

Posted 31-Dec-13 2:02am

jon-80

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Comments

Nigam Patel 31-Dec-13 8:23am

Hi Jon,

I have couple of question

1) "BooksAndMediaOnLoan" class is a static class ?
2) your button1_click event is on code behind file.

ZurdoDev 31-Dec-13 8:57am

Why won't it work? I'm confused.

JoCodes 31-Dec-13 11:33am

Doesnt seem anything wrong with it.Try to qualify it with proper namespaces if its not accessible.

Sergey Alexandrovich Kryukov 31-Dec-13 12:42pm

If code editor does not allow you to do something, you are not a software developer. What do you mean by "does not allow"?
—SA

2 solutions

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2013-12-31T04:28:00

Solution 2

The Code .cs Page and aspx page are different pages. That means Code File for customermanagementpage.aspx page is not BooksAndMediaOnLoan.cs.

That is why you can't access the List declared in BooksAndMediaOnLoan.cs page on other pages except its own aspx page.

Posted 31-Dec-13 4:28am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Matteo996 · Answer 2 · 2014-01-01T03:45:00

Hi,

if your BooksAndMediaOnLoan class is in the same namespace of the customermanagementpage class
is it possible to refer at BooksAndMediaOnLoanToCustomers list by writing

C#

BooksAndMediaOnLoan.BooksAndMediaOnLoanToCustomers

If it is in a different namespace (e.g. bmnamespace)

C#

bmnamespace.BooksAndMediaOnLoan.BooksAndMediaOnLoanToCustomers

Here an example (where both classes are in the same namespace):

BooksAndMediaOnLoan.cs

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace mynamespace
{
    class BooksAndMediaOnLoan
    {
        public static List<booksandmediaonloan> 
                       BooksAndMediaOnLoanToCustomers = new List<booksandmediaonloan>();
 
        private int _id;

        public int bookid
        {
            set { _id = value; }
            get { return _id; }    
        }
}

customermanagementpage.aspx.cs

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Configuration;

namespace mynamespace
{
    public partial class customermanagementpage : System.Web.UI.Page
    {



        protected void Button1_Click(object sender, EventArgs e)
        {
            //search within Media, Books and Customers
            BooksAndMediaOnLoan book = BooksAndMediaOnLoan.BooksAndMediaOnLoanToCustomers.Find(item => item.bookid = 100);
       
                
        }    
    }

}

Regards