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PORemoving duplicates in a List<T> based on selection from DataGridView
 

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    <p>(Obligatory beginner alert! I can't promise I'll understand everything you tell me.)</p> <p>I have a program that uses a <code>List&lt;T&gt;</code> of a custom class <code>CheckOrderLine</code> to populate a <code>DataGridView</code> through a <code>BindingSource</code>. From within the <code>dataGrid</code> control I provide the ability to "split" records into multiple lines for imposition purposes. I'm having trouble working out the reverse of this process.</p> <p>I need to be able to make a selection in <code>dataGrid</code>, get the first selected row to start from, then iterate through each <code>CheckOrderLine</code> in the selection and compare them to the first row.</p> <p>If they all match I need to change the quantity in the first record to be the sum of all the rows selected, then remove the extra rows.</p> <p>Here's a snippet of what I have worked out on my own so far:</p> <pre><code> int index = 1; while (index &lt; rowToJoin) { _bs.RaiseListChangedEvents = false; int first = _bs.Position; int second = first++; CheckOrderLine current = (CheckOrderLine)_bs[first]; CheckOrderLine next = (CheckOrderLine)_bs[second]; if (current.OrderNumber == next.OrderNumber) { _bs.RemoveAt(second); } else { MessageBox.Show("You must select at least two matching rows to join."); return; } _bs.RaiseListChangedEvents = true; _bs.ResetBindings(false); index++; } </code></pre> <p>This works only if I select from the bottom up, and only based on the OrderNumber. In order to prevent accidents I really need to check all fields between two rows. Being able to select in any direction would be a bonus at this point.</p> <p>EDIT: I think I wasn't clear enough originally.</p> <ol> <li>I have a method that can split a row into 2-5 new rows.</li> <li>My original code can join any number of rows, but only if selected bottom to top, and based on <code>OrderNumber</code>.</li> <li>Is there a more efficient way to compare two rows other than <code>current.OrderNumber == next.OrderNumber</code>? I know I could add all my fields into the <code>if</code> statement, but i'd prefer to have it more reusable.</li> <li>Selecting in any direction is a distant second to comparing between all fields.</li> </ol>
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