如何获取GridView中单元的值？

Question

I have review various questions here, regarding this, however I still cannot get this to work.

I have a grid view ( OrderList ) and in this gridview I have a column with a button to simply update a particular field (basically mark an order as accepted).

In the aspx file I have the following code

<asp:TemplateField>
    <ItemTemplate>
        <asp:Button ID="ButtonToAcceptOrder" runat="server" Text="Accept Order" CommandName="AcceptOrder" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />
    </ItemTemplate>
</asp:TemplateField>

In the code Behind file, I have the following code:

protected void OrderList_RowCommand(object sender, GridViewCommandEventArgs e)
{
     if (e.CommandName =="AcceptOrder")
     {
          // Retrieve the row index stored in the 
          // CommandArgument property. 
          int index = Convert.ToInt32(e.CommandArgument);

          // Retrieve the row that contains the button 
          // from the Rows collection.
          GridViewRow row = OrderList.Rows[index];

          Int32 oId = Int32.Parse(row.Cells[1].Text);

          //Code to Update database by order id
     }
}

The error is coming from oId telling that the input is not in the correct format.
In the first column of the gridview I am displaying the ID of that I require. Whilst the other columns are showing the other details.

If you spot any problems in my code can you kindly help?

(I have previously followed this tutorial: http://msdn.microsoft.com/en-us/library/vstudio/bb907626(v=vs.100).aspx )

Answer 1

If you have an unique id for each row, then you should be using the DataKeyNames property of the GridView.

<GridView id="OrderList" DataKeyNames="oId"... />

Then in your RowCommand code, access it like this:

Int32 oId = OrderList.DataKeys[row.DataItemIndex].Value;

This is much cleaner than trying to get value from a cell.