How Do I Save And Retrieve The Information From Arraylist

Question

1.00/5 (1 vote)

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Currently, what am doing is basically displaying product caatalog in my website. there is a checkbox button above every product. let say i want to select 3 checkboxes and click on compare button, it will lead me to another page. I am trying to save the data in array list, however, i can't

C#

void GetCheckedBox()
   {


       foreach (DataListItem item in DataList1.Items)
       {
           HtmlInputCheckBox cb = item.FindControl("FavChkBox") as HtmlInputCheckBox;
           if (cb != null && cb.Checked)
           {

               selectedProducts = selectedProducts + "," + cb.Value;


               LblText.Text = selectedProducts;
               Product.Add(selectedProducts);


               LblText.Text = selectedProducts;
               Session["product"] = Product;
             string url ="CompareProducts.aspx";
            Response.Redirect(url);
           }



       }
   }

.CompareProducts.aspx.cs

C#

protected void Page_Load(object sender, EventArgs e)
   {

           if (!IsPostBack)
           {


               ArrayList Product = Session["product"] as ArrayList;

             // string selectedProduct = Product.ToString();
              GridView1.DataSource = Product;
             GridView1.DataBind();
                   //array list is not null, safe to use
               }


           }

Posted 4-Aug-15 5:56am

Member 11829433

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Comments

[no name] 4-Aug-15 12:06pm

Why are you using an ArrayList to begin with? And what does "trying to save the data in array list, however, i can't" mean?

Member 11829433 4-Aug-15 12:10pm

I am not sure whether if my arraylist will stock the information whenever i checked on 3 products

Sergey Alexandrovich Kryukov 4-Aug-15 12:30pm

First, tag your language.
Never use ArrayList, it's obsolete, use System.Collections.Generic.List.
—SA

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F-ES Sitecore · Answer 1 · 2015-08-04T06:33:00

Solution 1

Try something like

C#

List<string> products = new List<string>();

foreach (DataListItem item in DataList1.Items)
{
    HtmlInputCheckBox cb = item.FindControl("FavChkBox") as HtmlInputCheckBox;

    if (cb != null && cb.Checked)
    {

        products.Add(cb.Value);

    }

}

if (products.Any())
{
    Session["product"] = product;
    string url ="CompareProducts.aspx";
    Response.Redirect(url);
}

On your target page;

C#

List<string> products = null;
if (Session["product"] != null)
{
    products = (List<string>)Session["product"];
}

Posted 4-Aug-15 6:33am

F-ES Sitecore

Updated 4-Aug-15 6:48am

v3

Comments

Richard Deeming 4-Aug-15 13:41pm

You can simplify the target page code to:
List<string> products = Session["product"] as List<string>;

F-ES Sitecore 4-Aug-15 14:22pm

You sure can, but it's good to get people into the habit of remembering that their session variables might not be there, and in this case he'd probably want to do something if there was no session variable like redirect somewhere. He could always check if products was null, but it makes it clearer what is going on if the "work done" is as a result of the variable not existing, than if an as cast failing.