代码之家 › 专栏 › 技术社区 › Andy

C#如何在不不断更改DefaultCellStyle的情况下为整行设置特定的单元格样式

datagridview .net c#

Andy · 技术社区 · 15 年前

我有一个对象列表(类型为“TrackedSet”),它是绑定到DataGridView的数据。添加新行时,我希望能够基于数据绑定对象的属性更改行外观。

在下面的代码中,我通过不断地将行的DefaultCellStyle属性更改为预定义的单元格样式来改变这一点,该样式的前景色设置为我想要的。

谢谢你的建议。

/// <summary>
        /// Handles the drawing of each DataGridView row depending on TrackedSet error or flagged state.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void setLogDataGridView_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)
        {
            if ((e.State & DataGridViewElementStates.Displayed) == DataGridViewElementStates.Displayed)
            {
                // Always disable normal painting of selection background and focus.
                e.PaintParts &= ~(DataGridViewPaintParts.SelectionBackground |
                                  DataGridViewPaintParts.Focus);

                // Get the tracked set associated with the row being painted.
                TrackedSet set = this._setLogBindingSource[e.RowIndex] as TrackedSet;

                if (set.IsFlagged || set.IsError) // Row requires custom painting.
                {
                    Color backColour1 = Color.Empty;
                    Color backColour2 = Color.Empty;

                    // Get rectangle of area to paint with custom brush.
                    Rectangle rowBounds = new Rectangle(
                        e.RowBounds.Left + 1,                                   // Location x
                        e.RowBounds.Top,                                        // Location y
                        this.setLogDataGridView.Columns.GetColumnsWidth(
                            DataGridViewElementStates.Visible) -
                        this.setLogDataGridView.HorizontalScrollingOffset + 1,  // Width
                        e.RowBounds.Height);                                    // Height

                    // Disable painting of backgrounds when custom painting row.
                    e.PaintParts &= ~(DataGridViewPaintParts.Background |
                                      DataGridViewPaintParts.ContentBackground);

                    if (set.IsFlagged) // Highlight colour.
                    {
                        backColour1 = this._highlightBackColour1;
                        backColour2 = this._highlightBackColour2;
                        this.setLogDataGridView.Rows[e.RowIndex].DefaultCellStyle = this._highlightStyle;
                    }
                    else // Error colour.
                    {
                        backColour1 = this._errorBackColour1;
                        backColour2 = this._errorBackColour2;
                        this.setLogDataGridView.Rows[e.RowIndex].DefaultCellStyle = this._errorStyle;
                    }

                    // Paint the custom background.
                    using (Brush lgb = new LinearGradientBrush(rowBounds, backColour1, backColour2, LinearGradientMode.Vertical))
                    {
                        e.Graphics.FillRectangle(lgb, rowBounds);
                    }
                }
            }
        }

1 回复 | 直到 15 年前

Adam Hughes 15 年前

您可以尝试在中设置背景色和前景色 CellFormatting 事件

void grid_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    TrackedSet set = this._setLogBindingSource[e.RowIndex] as TrackedSet;
    if (set.IsFlagged)
    {
        e.CellStyle.BackColor = Color.Blue;
        e.CellStyle.ForeColor = Color.White;
    }
    else if (set.IsError)
    {
        e.CellStyle.BackColor = Color.Red;
        e.CellStyle.ForeColor = Color.Blue;
    }
}

要拥有自定义渐变背景,您可能仍然需要在 RowPrePaint ForeColor 在 单元格格式 事件

DefaultCellStyle 在您将其绑定到DataGridView之后的行上,但我相信某些事件将触发DefaultCellStyle重置回 RowTemplate