CODEWITHSUNDEEP
c#asp.netlinqarraylist
dali1985
dali1985

Reputation: 3313

Usage of Arraylist in DropDownList

I have the following part in my Page_Load method:

 DropDownList1.Items.Add("Audi");
 DropDownList1.Items.Add("BMW");
 …
 DropDownList1.Items.Add("Ford");
 …
 DropDownList1.Items.Add("Vauxhall");
 DropDownList1.Items.Add("Volkswagen");
 …

Some details are that I have a web form that is part of a car sales web site, part of the required functionality is that users be able to select the manufacturer of vehicles from a drop down list. I created an <asp:DropDownList ... /> control.

My question is how can re-write the code above to use an ArrayList, that is fully populated as it is instantiated, is sorted into alphabetical order, and is then used to initialise the DropDownList?

Upvotes: 0

Views: 14221

Answers (6)

Bala
Bala

Reputation: 256

Provided with three option ListItemCollection, Array, IList. 

protected void Page_Load(object sender, EventArgs e)
        {
            //List item collection
            ListItemCollection listItemCollection = new ListItemCollection();
            listItemCollection.Add("Audi");
            listItemCollection.Add("BMW");
            listItemCollection.Add("Ford");
            listItemCollection.Add("Vauxhall");
            listItemCollection.Add("Volkswagen");
            CarDropDown.DataSource = listItemCollection;
            CarDropDown.DataBind();

            //Array
            string[] myCollect = { "Audi", "BMW", "Ford", "Vauxhall", "Volkswagen" };
            CarDropDown.DataSource = myCollect;
            CarDropDown.DataBind();

            //IList
            List<string> listCollection = new List<string>();
            listCollection.Add("Audi");
            listCollection.Add("BMW");
            listCollection.Add("Ford");
            listCollection.Add("Vauxhall");
            listCollection.Add("Volkswagen");
            CarDropDown.DataSource = listCollection.OrderBy(name => name);
            CarDropDown.DataBind();
        }

Upvotes: 0

Morten Anderson
Morten Anderson

Reputation: 2321

var makes = new List<string>{
  "Ford",
  "Audi",
  "BMW",
  "Vauxhall"
};

makes.Sort();

DropDownList1.DataSource = makes;
DropDownList1.DataBind();

Upvotes: 0

Cᴏʀʏ
Cᴏʀʏ

Reputation: 107536

Might as well get strongly-typed while we're at it:

var makes = new List<string> {
    "Audi",
    "BMW",
    "Ford",
    "Vauxhall",
    "Volkswagen"
};
makes.Sort(); 

DropDownList1.DataSource = makes;
DropDownList1.DataBind();

Upvotes: 5

GHP
GHP

Reputation: 3231

var makes = new List<string> 
{
    "BMW",
    "Volkswagen",
    "Ford",
    "Vauxhall",
    "Audi",
 };

  DropDownList1.DataSource = makes.OrderBy(x => x);
  DropDownList1.DataBind();

You can also use 'OrderByDescending' to flip it to reverse alpha.

makes.OrderByDescending(x => x);

Upvotes: 0

4b0
4b0

Reputation: 22323

try:

ArrayList MyArray = new ArrayList();
MyArray.Add("Audi");
MyArray.Add("BMW");
MyArray.Add("Ford");
MyArray.Add("Vauxhall");
MyArray.Add("Volkswagen");
MyArray.Sort();
MyDropDownList.DataSource = MyArray ;
MyDropDownList.DataBind();

Upvotes: 2

Brian Dishaw
Brian Dishaw

Reputation: 5825

private static ArrayList _listOfCars = new ArrayList { "Audi", "BMW", "Ford" };

protected override Page_Load ...
{
   DropDownList1.DataSource = _listOfCars;
   DropDownList1.DataBind();
}

This should also do what you need it to do. Syntax might not be totally correct, I didn't check it in VS.

Upvotes: 0

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