get datakey from datalist

[Andy Sutorius]

Hi,

I have a datalist with a asp:button. I have onitemcommand firing when the
button is clicked. I am attempting to get the datakey of the button that was
clicked. I can retrieve a specific datakey with the following: int
intProductID = Convert.ToInt16(dlstProducts.DataKeys[0]) but how do I
retrieve the datakey of the button clicked? I have tried this
unsuccessfully: int intProductID = Convert.ToInt16(dlstProducts.DataKeys[e])

Thanks,

Andy

 

[Karl Seguin]

use e.Item.ItemIndex to get the index of the item

dlstProducts.DataKeys[e.Item.ItemIndex]

also, any particular reason you are using ToInt16 instead of 32?

Karl

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[Andy Sutorius]

Hi Karl,

Why should it be ToInt32?

Andy

use e.Item.ItemIndex to get the index of the item

dlstProducts.DataKeys[e.Item.ItemIndex]

also, any particular reason you are using ToInt16 instead of 32?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)

Hi,

I have a datalist with a asp:button. I have onitemcommand firing when the
button is clicked. I am attempting to get the datakey of the button that was
clicked. I can retrieve a specific datakey with the following: int
intProductID = Convert.ToInt16(dlstProducts.DataKeys[0]) but how do I
retrieve the datakey of the button clicked? I have tried this
unsuccessfully: int intProductID = Convert.ToInt16(dlstProducts.DataKeys[e])

Thanks,

Andy

 

[Karl Seguin]

in my opinion yes...assuming ur developing on 32-bit system...

a c# int (or vb.net integer) maps to Int32 on a 32bit system so it's what
you'll get the most performance out of...

Int16 is only useful when you have very large chunks of data (large int
arrays) and you want to consume less space....

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)

Hi Karl,

Why should it be ToInt32?

Andy

use e.Item.ItemIndex to get the index of the item

dlstProducts.DataKeys[e.Item.ItemIndex]

also, any particular reason you are using ToInt16 instead of 32?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)

Hi,

I have a datalist with a asp:button. I have onitemcommand firing when the
button is clicked. I am attempting to get the datakey of the button

that
was

clicked. I can retrieve a specific datakey with the following: int
intProductID = Convert.ToInt16(dlstProducts.DataKeys[0]) but how do I
retrieve the datakey of the button clicked? I have tried this
unsuccessfully: int intProductID = Convert.ToInt16(dlstProducts.DataKeys[e])

Thanks,

Andy

 

[Andy Sutorius]

Karl,

After putting in the snippet of code I receive the following error: "Object
reference not set to an instance of an object."

Line 63: // Obtain current user's shopping cart ID
Line 64: String cartId = cart.GetShoppingCartId();
Line 65:
Line 66: // Add Product Item to Cart
Line 67: int intProductID =
Convert.ToInt32(dlstProducts.DataKeys[e.Item.ItemIndex]);


Source File: c:\inetpub\wwwroot\psyche\boutique\default.aspx.cs Line: 65

I'm stumped why the Convert statement isn't resolving this error.

Andy

 

[Karl Seguin]

A little hard to troubleshoot since line 65 appears blank

there are only 4 possibilities:
cart is null
dlstProducts is null
e is null
e.Item is null

it's imossible for me to tell you which it is with what you've given
me...try stepping through your code and put a watch on each of those
items...

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)

Karl,

After putting in the snippet of code I receive the following error: "Object
reference not set to an instance of an object."

Line 63: // Obtain current user's shopping cart ID
Line 64: String cartId = cart.GetShoppingCartId();
Line 65:
Line 66: // Add Product Item to Cart
Line 67: int intProductID =
Convert.ToInt32(dlstProducts.DataKeys[e.Item.ItemIndex]);


Source File: c:\inetpub\wwwroot\psyche\boutique\default.aspx.cs Line: 65

I'm stumped why the Convert statement isn't resolving this error.

Andy

use e.Item.ItemIndex to get the index of the item

dlstProducts.DataKeys[e.Item.ItemIndex]

also, any particular reason you are using ToInt16 instead of 32?

Karl

 

[Andy Sutorius]

Karl,

After a good nights sleep I stepped through and it worked perfectly. I must
have forgotten to rebuild or something. Sorry to lead you on a wild goose
chase.

Thanks for your help!

Andy

 

[Karl Seguin]

glad to hear it!

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)