DataGridView“CellPainting”事件未绘制正确的单元格

Question

我的DataGridView 控件有一个列移动功能，我可以将列移动到表格的左侧和右侧，我还有一个轮廓绘制/绘图事件，它在“无效”的单元格上绘制红色轮廓”。 不幸的是，当我移动分配了这些轮廓的列时，轮廓无法以一种非常奇怪的方式绘制到正确的单元格，其中轮廓停留在应该根据位置绘制到的单元格的左侧或右侧大纲原来是。

我创建了一个具有这两个功能的项目来演示这种奇怪的行为：

这是与创建大纲相关的代码：

        //Dictionary<colIndex,List<RowIndex>>
        private Dictionary<int,List<int>> invalidCellIndexes = new Dictionary<int,List<int>>();

        public void AddInvalidCellIndexes(int colIndex, int rowIndex)
        {
            Console.WriteLine("Adding outline to Column: " + colIndex.ToString() + ", at Row: " + rowIndex.ToString());
            if (!invalidCellIndexes.ContainsKey(colIndex))
            {
                invalidCellIndexes[colIndex] = new List<int>();
            }
            if (!invalidCellIndexes[colIndex].Contains(rowIndex))
            {
                invalidCellIndexes[colIndex].Add(rowIndex);
            }

            

        }
        public void RemoveInvalidCellIndexes(int colIndex, int rowIndex)
        {
            if (invalidCellIndexes.ContainsKey(colIndex))
            {
                invalidCellIndexes[colIndex].Remove(rowIndex);
                if (invalidCellIndexes[colIndex].Count == 0)
                {
                    invalidCellIndexes.Remove(colIndex);
                }
            }

            


        }


        //takes old ColumnOrder and new ColumnOrder and translates the invalidCellIndexes accordingly
        public void ShiftColumnsOfInvalidCellIndexes(List<string> oldColumnOrder, List<string> newColumnOrder)
        {



            Dictionary<int, List<int>> oldInvalidCellIndexes = invalidCellIndexes;
            Dictionary<int, List<int>> newInvalidCellIndexes = new Dictionary<int, List<int>>();

            for (int i = 0; i < oldColumnOrder.Count; i++)
            {
                string colName = oldColumnOrder[i];
                int oldIndex = i;
                int newIndex = newColumnOrder.IndexOf(colName);
                if (oldInvalidCellIndexes.ContainsKey(oldIndex))
                {
                    Console.WriteLine("shifting outline at index " + oldIndex.ToString() + " TO " + newIndex.ToString());

                    newInvalidCellIndexes[newIndex] = oldInvalidCellIndexes[oldIndex];



                }

            }


            invalidCellIndexes = newInvalidCellIndexes;



            


        }

        //code linked to CellPainting Event
        private void DataGridView1_CellPainting(object sender, System.Windows.Forms.DataGridViewCellPaintingEventArgs e)
        {
            


            //DataGridView senderDGV = (DataGridView)sender;

            if (e.RowIndex >= 0 && e.ColumnIndex >= 0)
            {
                if (invalidCellIndexes.ContainsKey(e.ColumnIndex) && invalidCellIndexes[e.ColumnIndex].Contains(e.RowIndex))
                {
                    //DataGridViewCell cell = senderDGV.Rows[e.RowIndex].Cells[e.ColumnIndex];

                    Console.WriteLine("painting: Row " + e.RowIndex.ToString() + ", column " + e.ColumnIndex.ToString());
                    e.Paint(e.CellBounds, DataGridViewPaintParts.All & ~DataGridViewPaintParts.Border);
                    using (Pen p = new Pen(Color.Red, 1))
                    {
                        Rectangle rect = e.CellBounds;
                        rect.Width -= 2;
                        rect.Height -= 2;
                        e.Graphics.DrawRectangle(p, rect);
                    }
                    e.Handled = true;
                }
            }




            
        }

这里是与添加列、添加轮廓和列移位相关的代码：

        //orderList tracks the column display order
        List<string> orderList = new List<string>();
        private void button2_Click(object sender, EventArgs e)
        {
            dataGridView1.Columns.Add("B", "B");
            dataGridView1.Columns.Add("C", "C");
            dataGridView1.Columns.Add("D", "D");
            dataGridView1.Columns.Add("A", "A");

            dataGridView1.Rows.Add();
            dataGridView1.Rows.Add();
            dataGridView1.Rows.Add();

            //add outline to second row of column "A"
            int AColIndex = dataGridView1.Columns.IndexOf(dataGridView1.Columns["A"]);
            int ARowIndex = 1;
            AddInvalidCellIndexes(AColIndex, ARowIndex);

            //add columns to orderlist
            foreach (DataGridViewColumn col in dataGridView1.Columns)
            {
                orderList.Add(col.Name);
            }


            button2.Enabled = false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int AColIndex = dataGridView1.Columns.IndexOf(dataGridView1.Columns["A"]);
            //shift "A" column to the left
            ShiftColumn("A", true);
        }
        private void button3_Click(object sender, EventArgs e)
        {
            int AColIndex = dataGridView1.Columns.IndexOf(dataGridView1.Columns["A"]);
            //shift "A" column to the right
            ShiftColumn("A", false);
        }

        internal void ShiftColumn(string colName, bool isLeft)
        {
            
            


            int newIndex = orderList.IndexOf(colName);
            if (isLeft)
            {
                newIndex -= 1;
            }
            else
            {
                newIndex += 1;
            }

            if (newIndex > -1 && newIndex < orderList.Count)
            {
                //duplicate orderList
                List<string> oldOrderList = new List<string>(orderList);


                orderList.Remove(colName);
                orderList.Insert(newIndex, colName);




                //for all columns which have shifted position due to this change

                //if shifted right, a single column to the right has been shifted before the new index
                int colI = newIndex - 1;
                if (isLeft)
                {
                    //if shifted to the left, only the new index and indexes after it have been shifted
                    colI = newIndex;
                }

                //shift column DisplayIndexes
                while (colI < orderList.Count)
                {
                    string thisColName = orderList[colI];
                    int thisOldIndex = oldOrderList.IndexOf(thisColName);
                    int thisNewIndex = colI;
                    dataGridView1.Columns[thisColName].DisplayIndex = thisNewIndex;


                    colI++;
                }

                //shift cell outlines as well
                ShiftColumnsOfInvalidCellIndexes(oldOrderList, orderList);

                
                




            }

        }

Answer 1

我没有调试你的代码来告诉你的代码有什么问题，但你只需要设置 DisplayIndex 并且你不需要移动数据，我可以通过一个非常简单的示例快速展示如何你可以用正确的方式做到这一点。

在示例中，我使用数据表来保存数据（它可以是任何其他支持数据绑定的数据结构）。还有有效或无效的行，我假设您可以根据单元格值判断有效性；例如这里的“O”是无效的。还有一个将活动列向左移动的按钮和一个向右移动的按钮：

private void Form1_Load(object sender, EventArgs e)
{
    var dt = new DataTable();
    dt.Columns.Add("A");
    dt.Columns.Add("B");
    dt.Columns.Add("C");
    dt.Columns.Add("D");
    dt.Rows.Add(new[] { "O", "O", "O", "O" });
    dt.Rows.Add(new[] { "X", "O", "O", "O" });
    dt.Rows.Add(new[] { "X", "X", "O", "O" });
    dt.Rows.Add(new[] { "X", "X", "X", "O" });
    dgv1.DataSource = dt;
}
private void dgv1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    if (e.FormattedValue as string == "O")
    {
        //Invalid
        e.Graphics.FillRectangle(Brushes.Pink, e.CellBounds);
        e.Paint(e.CellBounds, DataGridViewPaintParts.All &
            ~DataGridViewPaintParts.Background);
        e.Handled = true;
    }
}
private void ShiftLeftButton_Click(object sender, EventArgs e)
{
    if (dgv1.CurrentCell != null &&
        dgv1.CurrentCell.OwningColumn.DisplayIndex > 0)
        dgv1.CurrentCell.OwningColumn.DisplayIndex -= 1;
}
private void ShiftRightButton_Click(object sender, EventArgs e)
{
    if (dgv1.CurrentCell != null &&
        dgv1.CurrentCell.OwningColumn.DisplayIndex < dgv1.Columns.Count - 1)
        dgv1.CurrentCell.OwningColumn.DisplayIndex += 1;
}