自定义 DataGridViewCheckBoxCell 视觉更新在编辑模式下不起作用

Question

我有以下DataGridViewCheckBoxCell。问题是视觉更新不会在编辑模式下立即发生，只有当我退出它时才会发生

public class CustomDataGridViewCell : DataGridViewCheckBoxCell
{
    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)
    {
        base.Paint(graphics, clipBounds, cellBounds, rowIndex,
            elementState, value, formattedValue, errorText, cellStyle,
            advancedBorderStyle, DataGridViewPaintParts.All & ~DataGridViewPaintParts.ContentForeground);

        var val = (bool?)FormattedValue;
        var img = val.HasValue && val.Value ? Properties.Resources._checked : Properties.Resources._unchecked;
        var w = img.Width;
        var h = img.Height;
        var x = cellBounds.Left + (cellBounds.Width - w) / 2;
        var y = cellBounds.Top + (cellBounds.Height - h) / 2;
        graphics.DrawImage(img, new Rectangle(x, y, w, h));
    }
}

Answer 1

您需要 2 个修复：

您还应该创建一个 CustomDataGridViewCheckBoxColumn 并将其单元格模板设置为您的 CustomDataGridViewCheckBoxCell。
而不是 FormattedValue 属性，使用 formattedValue 参数。

代码如下：

public class CustomDataGridViewCheckBoxColumn: DataGridViewCheckBoxColumn
{
    public CustomDataGridViewColumn()
    {
        this.CellTemplate = new CustomDataGridViewCheckBoxCell();
    }
}
public class CustomDataGridViewCheckBoxCell: DataGridViewCheckBoxCell
{
    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)
    {
        base.Paint(graphics, clipBounds, cellBounds, rowIndex,
            elementState, value, formattedValue, errorText, cellStyle,
            advancedBorderStyle, DataGridViewPaintParts.All & ~DataGridViewPaintParts.ContentForeground);
        var val = (bool?)formattedValue;
        var img = val.HasValue && val.Value ? Properties.Resources.Checked : Properties.Resources.UnChecked;
        var w = img.Width;
        var h = img.Height;
        var x = cellBounds.Left + (cellBounds.Width - w) / 2;
        var y = cellBounds.Top + (cellBounds.Height - h) / 2;
        graphics.DrawImage(img, new Rectangle(x, y, w, h));
    }
}

自定义 DataGridViewCheckBoxCell 视觉更新在编辑模式下不起作用

Custom DataGridViewCheckBoxCell visual update doesn't work in edit mode

c#

datagridview

datagridviewcheckboxcell

datagridviewcolumn

winforms