MultiSelectSelect DataGridView c＃

Question

我似乎有一些与此类似但并非完全如此的问题。我试图在只有一列多行的DataGridView中进行多项选择。我希望能够使用普通单击（不按Ctrl）选择和取消选择，并且选择一直保留到再次单击为止。我得到

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {

            InitializeComponent();

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

        }

        DataGridView1.MultipleSelect = true;
        DataGridView1.SelectMode = GridViewSelectMode.SelectCells;

    private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
    {
        //handle the keep select/unselect group
    }

但是如何设置不使用Ctrl键保留选择的条件？谢谢

Answer 1

您可以通过稍微调整网格的配色方案来选择单元格，并在单击时将它们存储在列表中/从列表中删除：

    public partial class Form1 : Form
    {
        /// <summary>
        /// Currently selected cells.
        /// </summary>
        private List<DataGridViewCell> _selectedCells = new List<DataGridViewCell>();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            /* Just for test
            dataGridView1.Columns.Add("A", "ColA");
            dataGridView1.Columns.Add("B", "ColB");
            dataGridView1.Columns.Add("C", "ColC");
            dataGridView1.Columns.Add("D", "ColD");

            dataGridView1.Rows.Add("A1","B1","C1","D1");
            dataGridView1.Rows.Add("A2", "B2", "C2", "D2");
            dataGridView1.Rows.Add("A3", "B3", "C3", "D3");
            dataGridView1.Rows.Add("A4", "B4", "C4", "D4");
            dataGridView1.Rows.Add("A5", "B5", "C5", "D5");
            dataGridView1.Rows.Add("A6", "B6", "C6", "D6");
            */

            dataGridView1.MultiSelect = false;
            dataGridView1.SelectionMode = DataGridViewSelectionMode.CellSelect;
            dataGridView1.EditMode = DataGridViewEditMode.EditProgrammatically;
        }

        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            // Edited and added this line to avoid problems when clicking on the header.
            if (e.RowIndex < 0 || e.ColumnIndex < 0) return;
            // Clears all the selected cells.
            dataGridView1.ClearSelection();

            if (_selectedCells.Contains(dataGridView1[e.ColumnIndex, e.RowIndex]))
            {
                _selectedCells.Remove(dataGridView1[e.ColumnIndex, e.RowIndex]);
                dataGridView1[e.ColumnIndex, e.RowIndex].Style.BackColor = dataGridView1.DefaultCellStyle.BackColor;
            }
            else
            {
                _selectedCells.Add(dataGridView1[e.ColumnIndex, e.RowIndex]);
                dataGridView1[e.ColumnIndex, e.RowIndex].Style.BackColor = dataGridView1.DefaultCellStyle.SelectionBackColor;
            }
        }

        private void dataGridView1_SelectionChanged(object sender, EventArgs e)
        {
            dataGridView1.ClearSelection();
        }

        private void dataGridView1_DoubleClick(object sender, EventArgs e)
        {
            dataGridView1.BeginEdit(true);
        }
    }