【转】DataGridView 的重绘

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.net Winform 中的DataGridView 的外观有点难看。下面是重绘DataGridView的方法，可以重绘时参考：

1.重绘DataGridView

[csharp] view plaincopy
protected override void Paint(  
    Graphics graphics,  
    Rectangle clipBounds,  
    Rectangle cellBounds,  
    int rowIndex,  
    DataGridViewElementStates cellState,  
    object value,  
    object formattedValue,  
    string errorText,  
    DataGridViewCellStyle cellStyle,  
    DataGridViewAdvancedBorderStyle advancedBorderStyle,  
    DataGridViewPaintParts paintParts)  
{  
    // Call the base class method to paint the default cell appearance.  
    base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState,  
        value, formattedValue, errorText, cellStyle,  
        advancedBorderStyle, paintParts);  
  
    // Retrieve the client location of the mouse pointer.  
    Point cursorPosition =  
        this.DataGridView.PointToClient(Cursor.Position);  
  
    // If the mouse pointer is over the current cell, draw a custom border.  
    if (cellBounds.Contains(cursorPosition))  
    {  
        Rectangle newRect = new Rectangle(cellBounds.X + 1,  
            cellBounds.Y + 1, cellBounds.Width - 4,  
            cellBounds.Height - 4);  
        graphics.DrawRectangle(Pens.Red, newRect);  
    }  
}  

2.重绘DataGridView 的头部

[csharp] view plaincopy
protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)  
        {  
            base.OnCellPainting(e);  
  
            if (e.ColumnIndex == -1 && e.RowIndex == -1)  
            {  
                using (LinearGradientBrush brush = new LinearGradientBrush(e.CellBounds, Color.LightGray,  
                    Color.White, LinearGradientMode.ForwardDiagonal))  
                {  
                    e.Graphics.FillRectangle(brush, e.CellBounds);  
                    Rectangle border = e.CellBounds;  
                    border.Offset(new Point(-1, -1));  
                    e.Graphics.DrawRectangle(Pens.Gray, border);  
                }  
                e.PaintContent(e.CellBounds);  
                e.Handled = true;  
            }  
            else if (e.RowIndex == -1)  
            {  
                //标题行  
                using (LinearGradientBrush brush = new LinearGradientBrush(e.CellBounds, Color.LightGray,  
                    Color.White, LinearGradientMode.Vertical))  
                {  
                    e.Graphics.FillRectangle(brush, e.CellBounds);  
                    Rectangle border = e.CellBounds;  
                    border.Offset(new Point(-1, -1));  
                    e.Graphics.DrawRectangle(Pens.Gray, border);  
                }  
                e.PaintContent(e.CellBounds);  
                e.Handled = true;  
            }  
            else if (e.ColumnIndex == -1)  
            {  
                //标题列  
                using (LinearGradientBrush brush = new LinearGradientBrush(e.CellBounds, Color.LightGray,  
                    Color.White, LinearGradientMode.Horizontal))  
                {  
                    e.Graphics.FillRectangle(brush, e.CellBounds);  
                    Rectangle border = e.CellBounds;  
                    border.Offset(new Point(-1, -1));  
                    e.Graphics.DrawRectangle(Pens.Gray, border);  
                }  
                e.PaintContent(e.CellBounds);  
                e.Handled = true;  
            }  
        }  

3.重绘实现合并单元格

[csharp] view plaincopy
#region"合并单元格的测试"  
private int? nextrow = null;  
private int? nextcol = null;  
private void dataGridView1_CellFormatting(object sender, System.Windows.Forms.DataGridViewCellFormattingEventArgs e)  
{  
    if (this.dataGridView1.Columns["description"].Index == e.ColumnIndex && e.RowIndex >= 0)  
    {  
        if (this.nextcol != null & e.ColumnIndex == this.nextcol)  
        {  
            e.CellStyle.BackColor = Color.LightBlue;  
            this.nextcol = null;  
        }  
        if (this.nextrow != null & e.RowIndex == nextrow)  
        {  
            e.CellStyle.BackColor = Color.LightPink;  
            this.nextrow = null;  
        }  
        if (e.RowIndex != this.dataGridView1.RowCount - 1)  
        {  
            if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString())  
            {  
                e.CellStyle.BackColor = Color.LightPink;  
                nextrow = e.RowIndex + 1;  
            }  
        }  
    }  
    if (this.dataGridView1.Columns["name"].Index == e.ColumnIndex && e.RowIndex >= 0)  
    {  
        if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString())  
        {  
            e.CellStyle.BackColor = Color.LightBlue;  
            nextcol = e.ColumnIndex + 1;  
        }  
    }  
}  
//==========================  
         
//绘制单元格  
private void dataGridView1_CellPainting(object sender, System.Windows.Forms.DataGridViewCellPaintingEventArgs e)  
{  
  
   
  
    //纵向合并  
    if (this.dataGridView1.Columns["description"].Index == e.ColumnIndex && e.RowIndex >= 0)  
    {  
  
        using (  
            Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor),  
            backColorBrush = new SolidBrush(e.CellStyle.BackColor))  
        {  
            using (Pen gridLinePen = new Pen(gridBrush))  
            {  
                // 擦除原单元格背景  
                e.Graphics.FillRectangle(backColorBrush, e.CellBounds);  
                ////绘制线条,这些线条是单元格相互间隔的区分线条,  
                ////因为我们只对列name做处理,所以datagridview自己会处理左侧和上边缘的线条  
                if (e.RowIndex != this.dataGridView1.RowCount - 1)  
                {  
                    if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString())  
                    {  
  
                        e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,  
                        e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);//下边缘的线  
                        //绘制值  
                        if (e.Value != null)  
                        {  
                            e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,  
                                Brushes.Crimson, e.CellBounds.X + 2,  
                                e.CellBounds.Y + 2, StringFormat.GenericDefault);  
                        }  
                    }  
                }  
                else  
                {  
                    e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,  
                        e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);//下边缘的线  
                    //绘制值  
                    if (e.Value != null)  
                    {  
                        e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,  
                            Brushes.Crimson, e.CellBounds.X + 2,  
                            e.CellBounds.Y + 2, StringFormat.GenericDefault);  
                    }  
                }  
                //右侧的线  
                e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1,  
                    e.CellBounds.Top, e.CellBounds.Right - 1,  
                    e.CellBounds.Bottom - 1);  
  
                e.Handled = true;  
            }  
        }  
    }  
  
    //横向合并  
    if (this.dataGridView1.Columns["name"].Index == e.ColumnIndex && e.RowIndex >= 0)  
    {  
  
        using (  
            Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor),  
            backColorBrush = new SolidBrush(e.CellStyle.BackColor))  
        {  
            using (Pen gridLinePen = new Pen(gridBrush))  
            {  
                // 擦除原单元格背景  
                e.Graphics.FillRectangle(backColorBrush, e.CellBounds);  
  
                if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString())  
                {  
  
                    //右侧的线  
                    e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top,  
                        e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);  
                    //绘制值  
                    if (e.Value != null)  
                    {  
                        e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,  
                            Brushes.Crimson, e.CellBounds.X + 2,  
                            e.CellBounds.Y + 2, StringFormat.GenericDefault);  
                    }  
                }  
  
                //下边缘的线  
                e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,  
                                            e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);  
                e.Handled = true;  
            }  
        }  
  
    }  
  
}  
 
#endregion  

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