CODEWITHSUNDEEP
c#.netgenerics.net-3.5
Rocky Singh
Rocky Singh

Reputation: 15430

Change arraylist to generic

I am using below code :

            var list = new Collection<ArrayList>
                       {
                           new ArrayList
                               {
                                   1,
                                   "Test1"
                               },
                           new ArrayList
                               {
                                   2,
                                   "Test2"
                               },
                       };

In the above code I want to avoid the ArrayList and use the Generics. Is it possible in the above code?

Edit: Above I have used only two values in one arraylist object, I may have multiple items of int's and string's in it.

Upvotes: 1

Views: 2303

Answers (6)

Frank Bollack
Frank Bollack

Reputation: 25166

I'm not sure what you are actually trying to achieve, but it seems to me you are trying to mimic the behavior of a dictionary or map, that can map two different values to each other. These values could be of any type you want.

Something like this:

Dictionary<int, string> d = new Dictionary<int, string>();
d.Add(1, "Test1");
d.Add(2, "Test2");

and you can handle your data as simple as:

string t1 = d[1];    //will hold "Test1"
string t2 = d[2];    //will hold "Test2"

Do you want something like this?

Upvotes: 0

QrystaL
QrystaL

Reputation: 4966

Maybe you need Dictionary?

var list = new Dictionary<int, string>
{
    { 1, "Test1" },
    { 2, "Test2" }
};

Upvotes: 1

Oded
Oded

Reputation: 498972

You can't mix types in a generic list (unless the generic type is object, but that equates to ArrayList and is just a perversion of generics).

But you can create a class that contains a string and int and use that as the generic parameter for a generic list.

public class MyClass
{
 public MyString string { get; set; }
 public MyInt int { get; set; }
}

var list = new Collection<MyClass>
           {
             new MyClass { MyInt = 1, MyString = "Test1" },
             new MyClass { MyInt = 2, MyString = "Test2" }
           }

Another alternative, if using .NET 4.0 is to use a Tuple, though I would rather have a strongly typed class.

(untested code):

 var list = new Collection<Tuple<int,string>>
           {
             Tuple.Create(1, "Test1"),
             Tuple.Create(2, "Test2")
           }

Upvotes: 6

Samir Adel
Samir Adel

Reputation: 2499

var list = new List < Dictionary<int, string>> ();

then you can populate it was data as you need.

Upvotes: 0

JohnD
JohnD

Reputation: 14757

Not really, the fact that you have different types makes using a generic pointless.

You could use List<object> instead of ArrayList but there's really no point. Instead you could create a custom class to hold the 2 values and use that in a generic type.

John

Upvotes: 2

SLaks
SLaks

Reputation: 887375

No.
The whole point of generics is that you can't put an int and a string in the same collection.

Instead, you should create your own class with int and string properties, then create a generic collection of that class.

Upvotes: 4

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