Built-In Header Cells in VS .NET

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Header cells are the cells rendered at the top and left sides of the grid They provide the context or a guide to what the cells in the grid contain Column header cells are of type DataGridViewColumnHeaderCell, and their header text indicates the content of the column cells The cell contains an up or down triangle when the column supports sorting; users can sort the column by clicking on the column header Usually the header text is set through the HeaderText property on the column, either explicitly through code or implicitly through data binding based on the data's schema You can also access the header cell directly from the column through the HeaderCell property and use its Value to set the text displayed The row header cells are of type DataGridViewRowHeaderCell They indicate row selections with a triangle glyph, editing mode with a pencil glyph, and the new row with a star glyph Row header cells can display text as well; you set the cell's Value to a string value by accessing the row's HeaderCell property Both column and row headers can be further customized by implementing custom painting by handling the CellPainting event on the grid Note that if you do custom painting, you must do all the painting of the header cell yourself, and then set the Handled property on the event argument to true: private void OnCellPainting(object sender, DataGridViewCellPaintingEventArgs e) { if (eColumnIndex < 0) { eGraphicsFillRectangle(BrushesAqua, eCellBounds); eHandled = true; } }
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This code checks to see if the column being painted has an index less than zero, which indicates that the row header is being painted The column index of the row headers is 1, and the row index of the column headers is also 1 You cannot index into the Cells collection on the row with these values, but you can use them as a flag in the CellPainting event to know when it is a header that is being painted Additionally, you can set the CellHeader property to an instance of a class that derives fromDataGridViewCell, and then that cell type will be used when the header cells are rendered You can derive your own class from the cell base class and do whatever kind of custom painting, formatting, or setting of styles there that makes sense
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Handling Grid Data Edits
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How you handle grid edits is going to depend on the following:
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The type of column or cell you are dealing with Whether the data is data bound Whether you are in virtual mode
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As mentioned earlier, when working with a text box column, users can start editing a cell by putting the focus into the cell with the mouse, arrow keys, or by pressing the F2 key when the mouse pointer is in the cell If users then start typing characters, the current contents of the cell will be overwritten When they change the focus to another cell, this completes the editing process The first thing that happens that you might want to handle is that the CellParsing event fires Like its CellFormatting counterpart, this event gives you an opportunity to intercept the value that was entered into the cell while in edit mode, either to handle storing that value somewhere yourself or to transform it into some other value before it is stored If the cell is data bound, and if the data source supports editing the data objects in the collection, the data will automatically be pushed back into the underlying data source If the cell is a button or link cell, however, you won't be able to edit the contents in the first place because they don't support editing If the cell is a combo box cell, editing is done by selecting a value in the drop-down list or overtyping the current selection if the cell has its DisplayStyle property set to ComboBox This changes the cell's value when editing is complete (when the focus moves off the cell) and results in the same action as if that value had been typed into a text box cell If the grid is in virtual mode, you will need to handle the CellValuePushed event to grab the value that was entered and do what you need to with it When a cell switches into edit mode, an event named EditingControlShowing fires This event passes an event argument that lets you get a reference to the editing control itself The built-in cell types that support editing (text box, combo box, and check box cell types) create an instance of an editing control that derives from their normal Windows Forms counterparts (TextBox, ComboBox, and CheckBox, respectively) and display that control as a child control inside a panel inside the cell If you create a custom cell type that supports editing, then you will want to follow a similar approach Through the EditingControlShowing event, you can get a reference to the editing control in use and can tap into its event model to respond to edits in realtime For example, if you want to dynamically react to selections in a combo box column while the control is still in edit mode and the selected value hasn't been pushed yet into the cell's underlying value (meaning the CellParsing event hasn't yet fired), you could use theEditingControlShowing event to hook things up: public Form1() { InitializeComponent(); m_GridEditingControlShowing += OnEditControlShowing(); } private void OnEditControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { if (m_GridCurrentCellColumnIndex == 2) { m_HookedCombo = eControl as ComboBox; if (m_HookedCombo == null) return; m_HookedComboSelectedIndexChanged += OnCountryComboChanged; } }
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