Storing values into EventArgs

[penny111]

I am currently building a shopping cart application in C# where there are 10 items to select from. There are 10 "Add to Cart" buttons, when clicked, will trigger a single method. That single method will either add a row (new item), or update the quantity (old item). In my existing code, i loop through each row in the DataSet to determine whether i should add a row or update a row.

Is there a way to store the item information (name, description and price) in EventArgs so that when the "Add to Cart"
button is clicked, the item information is passed to the single method using EventArgs?

[moiashvin]

I am currently building a shopping cart application in C# where there are 10 items to select from. There are 10 "Add to Cart" buttons, when clicked, will trigger a single method. That single method will either add a row (new item), or update the quantity (old item). In my existing code, i loop through each row in the DataSet to determine whether i should add a row or update a row.

Is there a way to store the item information (name, description and price) in EventArgs so that when the "Add to Cart"
button is clicked, the item information is passed to the single method using EventArgs?

Hi,

You can create a custom EventArgs class, by making your class a subclass of the EventArgs class. This will allow you to add any data you want as instance members.

E.g.

public class MyCustomEventArgs : EventArgs
{

private int myInteger;
private string myString;

public MyCustomEventArgs(int myInteger, string myString)
{
this.myInteger = myInteger;
this.myString = myString;
}

//and some properties to access these data indivually (if required)
public int MyInteger
{
get { return myInteger; }
set { this.myInteger = value; }
}

//...
//...
}

Hope it helps.

Cheers

[penny111]

I tried to create my own EventArgs class called ItemEventArgs, and just pass it into the AddToCartMethod.

<asp:Button ID="Button1" runat="server" Font-Size="Small" Text="Add to Cart" OnClick="AddToCart" /></p>

The above button in an aspx page will trigger the method below

protected void AddToCart(object sender, ItemEventArgs e)
{
//...
}

But i get an error saying that "No overload for "AddToCart" matches delegate 'System.EventHandler"

[moiashvin]

I tried to create my own EventArgs class called ItemEventArgs, and just pass it into the AddToCartMethod.

<asp:Button ID="Button1" runat="server" Font-Size="Small" Text="Add to Cart" OnClick="AddToCart" /></p>

The above button in an aspx page will trigger the method below

protected void AddToCart(object sender, ItemEventArgs e)
{
//...
}

But i get an error saying that "No overload for "AddToCart" matches delegate 'System.EventHandler"

Hi,

All this should be implemented with the use of delegates. Here are the steps:

1. first define you delegate (probably outside the class declaration) e.g.
public delegate void AddToCartEventHandler(object sender, ItemEventArgs e);

2. Create your event in ur class e.g.
public event AddToCartEventHandler addToCartEventHandler;

3. register you AddToCart method to the event e.g.
yourInstanceObject.addToCartEventHandler += new AddToCartEventHandler(AddToCart);

4. Whenver you button is pressed by the user, raised the event addToCart..e.g.
addToCartEventHandler(this, e);

where e an instance of the event args you created before (i think it's ItemEventArgs)...

Hope it helps.

Cheers!