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Always Set FormattingApplied to True When Dynamically Formatting Cell Content If you fail to set the FormattingApplied property on the event argument to theCellFormatting event, the grid won't know that the content is being determined dynamically and may not work properly for certain other grid behaviors
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It should be noted that the code example for the CellFormatting event is fairly inefficient from a performance perspective First, you wouldn't want to look up the column's index by name in the column collection every time It would be more efficient to look it up once, store it in a member variable, and then use that index directly for comparison I went with the lookup approach in this sample to keep it simple and easy to readso you could focus on the grid details instead of a bunch of performance-oriented code Besides, this is a somewhat contrived example anyway; it's just meant to demonstrate how to create an unbound column If you want to set the actual stored cell values of unbound columns in the grid, a better way to do this is to handle the RowsAdded event As you might guess from the name, this event is fired as rows are added to the grid By handling this event, you can populate the values of all the unbound cells in a row in one shot, which is slightly more efficient than having to handle the CellFormatting event for every cell TheRowsAdded event can be fired for one row at a time if you are programmatically adding rows in a loop, or it can be fired just once for a whole batch of rows being added, such as when you data bind or use the AddCopies method of the rows collection The event argument to RowsAdded contains properties forRowIndex and RowCount; these properties let you iterate through the rows that were added to update the unbound column values in a loop The following method shows an alternative approach for populating the grid's Contact column from the previous example, using the RowsAdded method instead of the CellFormatting event:
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private void OnRowsAdded(object sender, DataGridViewRowsAddedEventArgs e) { for (int i = 0; i < eRowCount; i++)
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{ DataGridViewRow row = m_CustomersGridRows[eRowIndex + i]; rowCells["Contact"]Value = stringFormat("{0} : {1}", rowCells["ContactName"]Value, rowCells["Phone"]Value); } }
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This code obtains the current row being set in the loop by indexing into the Rows collection with the RowIndex property from the event argument and a loop index offset up to the number of rows that are affected when this event fires It then uses the existing data in that row's other columns to compute the contents of the current row For a real-world application, you could obtain or compute the value of the unbound columns in the row in the loop instead
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Use the CellFormatting event to control displayed cell content and theRowsAdded event to control stored cell content The CellFormatting event is fired for every cell as it is rendered, giving you a chance to inspect and possibly modify the value that will be presented for any of the cells in the grid If you want to modify the actual value of an unbound column that is stored in the grid cells collection, use the RowsAdded event to set all the unbound column values in one shot when the row is added, instead of requiring a separate event firing for each cell If the data that you are presenting is purely computed data, instead of data that you are retrieving or deriving from bound data, consider using virtual mode to populate those cells, as discussed in the next section
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