示例#1
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        // ========================================================================
        // Methods

        #region === Methods

        /// <returns>
        /// An <see cref="T:System.Object"/> that represents the cloned <see cref="T:System.Windows.Forms.DataGridViewBand"/>.
        /// </returns>
        public override object Clone()
        {
            DataGridViewImageComboBoxColumn clone = base.Clone() as DataGridViewImageComboBoxColumn;

            if (clone != null)
            {
                clone.ImageList = ImageList;
                clone.ImageSize = ImageSize;
                clone.Items     = new List <ImageComboBoxItem>(Items);
            }
            return(clone);
        }
        /// <summary>
        ///   Attaches and initializes the hosted editing control.
        /// </summary>
        /// <param name = "rowIndex">The index of the cell's parent row.</param>
        /// <param name = "initialFormattedValue">The initial value to be displayed in the control.</param>
        /// <param name = "dataGridViewCellStyle">A <see cref = "T:System.Windows.Forms.DataGridViewCellStyle" /> that determines the appearance of the hosted control.</param>
        public override void InitializeEditingControl(int rowIndex, object initialFormattedValue,
                                                      DataGridViewCellStyle dataGridViewCellStyle)
        {
            base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);

            DataGridViewImageComboBoxEditingControl control =
                DataGridView.EditingControl as DataGridViewImageComboBoxEditingControl;
            DataGridViewImageComboBoxColumn column = OwningColumn as DataGridViewImageComboBoxColumn;

            if (control != null && column != null)
            {
                control.ImageList  = column.ImageList;
                control.ImageSize  = column.ImageSize;
                control.ItemHeight = column.ImageSize.Height + 2;
                control.Items.Clear();
                control.Items.AddRange(column.Items.ToArray());

                control.SelectedItem = Value as ImageComboBoxItem;
            }
        }
        /// <summary>
        ///   Paints the current <see cref = "DataGridViewImageComboBoxColumnCell" />.
        /// </summary>
        /// <param name = "graphics">The <see cref = "T:System.Drawing.Graphics" /> used to paint the cell.</param>
        /// <param name = "clipBounds">A <see cref = "T:System.Drawing.Rectangle" /> that represents the area of the <see cref = "T:System.Windows.Forms.DataGridView" /> that needs to be repainted.</param>
        /// <param name = "cellBounds">A <see cref = "T:System.Drawing.Rectangle" /> that contains the bounds of the cell that is being painted.</param>
        /// <param name = "rowIndex">The row index of the cell that is being painted.</param>
        /// <param name = "elementState">A bitwise combination of <see cref = "T:System.Windows.Forms.DataGridViewElementStates" /> values that specifies the state of the cell.</param>
        /// <param name = "value">The data of the cell that is being painted.</param>
        /// <param name = "formattedValue">The formatted data of the cell that is being painted.</param>
        /// <param name = "errorText">An error message that is associated with the cell.</param>
        /// <param name = "cellStyle">A <see cref = "T:System.Windows.Forms.DataGridViewCellStyle" /> that contains formatting and style information about the cell.</param>
        /// <param name = "advancedBorderStyle">A <see cref = "T:System.Windows.Forms.DataGridViewAdvancedBorderStyle" /> that contains border styles for the cell that is being painted.</param>
        /// <param name = "paintParts">A bitwise combination of the <see cref = "T:System.Windows.Forms.DataGridViewPaintParts" /> values that specifies which parts of the cell need to be painted.</param>
        protected override void Paint(Graphics graphics,
                                      Rectangle clipBounds, Rectangle cellBounds, int rowIndex,
                                      DataGridViewElementStates elementState, object value,
                                      object formattedValue, string errorText,
                                      DataGridViewCellStyle cellStyle,
                                      DataGridViewAdvancedBorderStyle advancedBorderStyle,
                                      DataGridViewPaintParts paintParts)
        {
            //Call the base to draw the combo box itself.
            base.Paint(graphics, clipBounds, cellBounds, rowIndex, elementState, value, null,
                       errorText, cellStyle, advancedBorderStyle, paintParts);

            //Now we will draw the current content of the box.
            DataGridViewImageComboBoxColumn column = ((DataGridViewImageComboBoxColumn)OwningColumn);

            if ((paintParts & DataGridViewPaintParts.Background) != 0 || (paintParts & DataGridViewPaintParts.All) != 0)
            {
                Rectangle rect = new Rectangle(cellBounds.X + 4, cellBounds.Y, cellBounds.Width - 4, cellBounds.Height - 1);
                ControlDrawHelper.DrawImageComboBoxItem(graphics, value, column.ImageList, column.ImageSize, rect, cellStyle.Font, cellStyle.ForeColor);
            }
        }