Array Key Value in ASP .NET with C#

Question

I am new to asp.net with C#. Now I need a solution for one issue.

In PHP I can create an array like this:

$arr[] = array('product_id' => 12, 'process_id' => 23, 'note' => 'This is Note');

//Example
Array
(
    [0] => Array
        (
            [product_id] => 12
            [process_id] => 23
            [note] => This is Note
        )

    [1] => Array
        (
            [product_id] => 5
            [process_id] => 19
            [note] => Hello
        )

    [2] => Array
        (
            [product_id] => 8
            [process_id] => 17
            [note] => How to Solve this Issue
        )

)

I want to create the same array structure in asp.net with C#.

Please help me to solve this issue.

Anthony Pegram · Accepted Answer · 2011-11-01 17:55:32Z

40

Use a Dictionary<TKey, TValue> for quick lookups of a value (your object) based on a key (your string).

var dictionary = new Dictionary<string, object>();
dictionary.Add("product_id", 12);
// etc.

object productId = dictionary["product_id"];

To simplify the Add operation, you could use collection initialization syntax such as

var dictionary = new Dictionary<string, int> { { "product_id", 12 }, { "process_id", 23 }, /* etc */ };

Edit

With your update, I would go ahead and define a proper type to encapsulate your data

class Foo
{
    public int ProductId { get; set; }
    public int ProcessId { get; set; }
    public string Note { get; set; } 
}

And then create an array or list of that type.

var list = new List<Foo>
           {
                new Foo { ProductId = 1, ProcessId = 2, Note = "Hello" },
                new Foo { ProductId = 3, ProcessId = 4, Note = "World" },
                /* etc */
           };

And then you have a list of strongly-typed objects you can iterate over, bind to controls, etc.

var firstFoo = list[0];
someLabel.Text = firstFoo.ProductId.ToString();
anotherLabel.Text = firstFoo.Note;

edited Nov 1, 2011 at 17:55

answered Nov 1, 2011 at 17:44

Anthony Pegram

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3 Comments

rkaartikeyan Over a year ago

Thanks for your Quick Reply, Array ( [0] => Array ( [product_id] => 12 [process_id] => 23 [note] => This is Note ) [1] => Array ( [product_id] => 5 [process_id] => 19 [note] => Hello ) [2] => Array ( [product_id] => 8 [process_id] => 17 [note] => How to Solve this Issue ) ) I want to do like this...

Anthony Pegram Over a year ago

If you want to do that, I would simply define a class to encapsulate your data and just have an array or list of instances of that class. Jon's answer suggests perhaps an anonymous type, which is also an option.

rkaartikeyan Over a year ago

sure sir, it would be a great help to me.

Jon Skeet · Accepted Answer · 2011-11-01 17:58:03Z

5

If you're looking for a mapping from string to object:

Dictionary<string, object> map = new Dictionary<string, object> {
    { "product_id", 12 },
    { "process_id", 23 },
    { "note", "This is Note" }
};

Alternatively, perhaps you'd like an anonymous class, if this is just a way of passing data around:

var values = new {
    ProductId = 12,
    ProcessId = 23,
    Note = "This is Note"
};

It really depends on what you're trying to achieve - the bigger picture.

EDIT: If you've got the same "keys" for multiple values, I would probably create a specific type for this - it's not clear what sort of entity this is meant to represent, but you should create a class to model it, and add appropriate behaviour to it as required.

edited Nov 1, 2011 at 17:58

answered Nov 1, 2011 at 17:46

Jon Skeet

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2 Comments

rkaartikeyan Over a year ago

Thanks to give a Quick Reply, I modified the question, please have a look sir. Actually i am storing the product_id, process_id, note into array for every form post. Finally i will manipulate the array and store into database.

Jon Skeet Over a year ago

@user707852: That doesn't really change my answer - you could apply my answer to either case. To be honest though, I suspect you'd be better off creating a type to encapsulate these values...

Khan · Accepted Answer · 2011-11-01 17:59:23Z

2

Try this

System.Collections.Generic.Dictionary<string, object>[] map = new System.Collections.Generic.Dictionary<string, object>[10];

map[0] = new System.Collections.Generic.Dictionary<string,object>();
map[0].Add("product_id", 12);
map[0].Add("process_id", 23);
map[0].Add("note", "This is Note");

map[1] = new System.Collections.Generic.Dictionary<string,object>();
map[1].Add("product_id", 5);
map[1].Add("process_id", 19);
map[1].Add("note", "Hello");

answered Nov 1, 2011 at 17:59

Khan

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2 Comments

svick Over a year ago

I think List<T> makes more sense than an array here.

Khan Over a year ago

Oups yeah with the edited question, same structure, it would make alot more sense too use the above answer and it is much more elegant.

Anand · Accepted Answer · 2011-11-01 17:57:14Z

1

Associative array could be represented in C# using Dictionary. Its Enumerator.Current would return a keyValuePair.

So your array would like

var associativeArray = new Dictionary<string, string>(){ {"product_id", "12"}, {"process_id"," 23", {"note","This is Note"}};

answered Nov 1, 2011 at 17:57

Anand

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