DataGridView Error Displays in .NET

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Once again, the DataGridView requires special treatment with respect to displaying error information because of the complexity of data it is capable of displaying The DataGridView control has built-in support for displaying error information at both the row and cell levels The way it works is quite simple Just like working with an error provider at the form level, you set the ErrorText property on either a row or a cell When you do, an error provider-like icon will appear on the row or cell, with its tooltip set to whatever error text you set (see Figure 104)
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Figure 104 Row and Cell Errors in a DataGridView
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Typically you will want to set only one or the other As you can see in Figure 104, the icon shows up in the row header when you set the ErrorText property on a row, and in the far right side of a cell when you set it on a cell These same error indications will be displayed by the DataGridView if there are errors returned from the data source itself, instead of being set directly on the grid's cells or rows Data source errors are discussed later in this chapter
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DataGridView DataError Event
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There are a lot of different places that things can go wrong with bound data in DataGridView control The data that goes into the grid a could come from direct input from the user if you allow the grid to support editing and adding new rows, or it could be programmatically changed behind the scenes You could have complex cell types that have some error in their processing or presentation of their values The DataError event on the DataGridView lets you provide centralized processing code for handling errors of many different types that can occur to the data within a DataGridView control or from the underlying data source The event passes an event argument of type DataGridViewDataErrorEventArgs, which carries a bunch of context information about the error along with it This event argument type has the properties shown in Table 101
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Table 101 DataGridViewDataErrorEventArgs Class Properties
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Name Cancel Type Boolean Description If you set this property to true, other subscribers for this event will not be called; if false, they will The default is false This property is inherited from the CancelEventArgs base class The cell's column index that caused the error
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ColumnIndex Context
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Integer
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DataGridViewDataErrorContexts An enumerated value that describes the context where the error occurred (see Table 102) This is a flags enumeration type, so it can take on any combination of the values shown in Table 102 Exception Integer Boolean The exception that was thrown to cause the error The row index where the problem occurred If this property is true, your event handler should rethrow the exception after processing it If false (the default), your handler shouldn't rethrow the exception
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Exception RowIndex ThrowException
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Table 102 DataGridViewDataErrorContexts Flags Enumeration Values
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Value ClipboardContent Commit CurrentCellChange Description An error occurred copying the cell contents to the Clipboard because it couldn't be converted to a string An error occurred when the grid tried to write the parsed value to the underlying data source This error is caused by trying to change to a different cell when there is already an error in the current cell that hasn't been corrected yet An error occurred when trying to paint the cell or the tooltip text This usually means there is something wrong with the mapping of the column to the property or field in the data source An error occurred when trying to format data as it is taken out of the data source and before it is displayed, possibly from any custom formatting code An error occurred when trying to roll back the cell value to its previous value, typically by the user pressing the Esc key An error occurred as the focus was leaving the grid, because the control couldn't save pending changes in the grid to the data source An error occurred when trying to take the entered value from a cell and save it to the underlying data source, possibly from any custom parsing code An error occurred when the grid tried to calculate the desired size of a cell based on its formatted contents An error occurred when the grid tried to remove a row from the data source based on a deletion in the grid (usually by the user pressing the Del key) An error occurred when scrolling a cell into view, because of the formatting or display code invoked based on the cell becoming visible
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