DataGridView：更改数据源后保留选择吗？

有没有办法在更改数据源后保持 DataGridView 的选定单元格处于选中状态？

您可以根据特定于您的需求的条件来匹配应选择的内容，只需根据您的匹配将单元格或行的 Select 属性设置为 true/false 即可。这是一个简单的示例，您可以将其放入新创建的 winforms 项目中来说明这一点。为了使此示例正常工作，请确保设置 DataGridView 的 SelectionMode = FullRowSelect。如果您想保留/重新应用单元格选择，方法将类似。注意：您也可以只保留选定行索引的列表，但这在加载另一个数据源时通常没有意义，因为实际行与其在数据中的物理位置之间通常不太可能存在任何对应关系。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace DataGridViewRetainSelection
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private readonly List<Person> currentPeople = new List<Person>();
        private bool dummyToggle = true;

        private void Form1_Load(object sender, EventArgs e)
        {
            SwitchDataSource(); // will just new up the datasource
        }

        private void ButtonSwitchDataSourceClick(object sender, EventArgs e)
        {
            SwitchDataSource();
        }

        private void SwitchDataSource()
        {
            var selectedPeople = (from DataGridViewRow row in dataGridViewPeople.Rows where row.Selected select currentPeople[row.Index]).ToList();

            peopleBindingSource.DataSource = null;

            currentPeople.Clear();
            if (dummyToggle)
            {
                currentPeople.Add(new Person { Name = "Joel Spolsky" });
                currentPeople.Add(new Person { Name = "Jeff Atwood" });
                currentPeople.Add(new Person { Name = "Jarrod Dixon" });
                currentPeople.Add(new Person { Name = "Geoff Dalgas" });
                currentPeople.Add(new Person { Name = "Brent Ozar" });
            }
            else
            {
                currentPeople.Add(new Person { Name = "Joel Spolsky" });
                currentPeople.Add(new Person { Name = "Jeff Atwood" });
                currentPeople.Add(new Person { Name = "Brent Ozar" });
            }

            dummyToggle = !dummyToggle;

            peopleBindingSource.DataSource = currentPeople;

            foreach (var person in selectedPeople)
            {
                foreach (DataGridViewRow row in dataGridViewPeople.Rows)
                {
                    if (string.Equals(row.Cells[0].Value, person.Name))
                    {
                        row.Selected = true;
                    }
                }
            }
        }
    }

    public sealed class Person
    {
        public string Name { get; set; }
    }

}

要为选定的单元格实现相同的功能，请执行以下操作。如果其他人需要它，我将保留以前的代码。注意：我只是在这里敲出一个匿名类型，您可能需要根据成员字段、属性等做一些更复杂的事情，但是设置所选单元格的一般原理已正确说明并且可以我希望可以轻松地进行测试和调试以便理解。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace DataGridViewRetainSelection
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private readonly List<Person> currentPeople = new List<Person>();
        private bool dummyToggle = true;

        private void Form1_Load(object sender, EventArgs e)
        {
            dataGridViewPeople.SelectionMode = DataGridViewSelectionMode.CellSelect;
            SwitchDataSource(); // will just new up the datasource
        }

        private void ButtonSwitchDataSourceClick(object sender, EventArgs e)
        {
            SwitchDataSource();
        }

        private void SwitchDataSource()
        {
            var selectedPeopleAndCells = (from DataGridViewCell cell in dataGridViewPeople.SelectedCells where cell.Selected select new { Person = currentPeople[cell.RowIndex], Cell = cell }).ToList();

            peopleBindingSource.DataSource = null;

            currentPeople.Clear();
            if (dummyToggle)
            {
                currentPeople.Add(new Person { Name = "Joel Spolsky", Id = 0 });
                currentPeople.Add(new Person { Name = "Jeff Atwood", Id = 1 });
                currentPeople.Add(new Person { Name = "Jarrod Dixon", Id = 2 });
                currentPeople.Add(new Person { Name = "Geoff Dalgas", Id = 3 });
                currentPeople.Add(new Person { Name = "Brent Ozar", Id = 4 });
            }
            else
            {
                currentPeople.Add(new Person { Name = "Joel Spolsky", Id = 0 });
                currentPeople.Add(new Person { Name = "Jeff Atwood", Id = 1 });
                currentPeople.Add(new Person { Name = "Brent Ozar", Id = 4 });
            }

            dummyToggle = !dummyToggle;

            peopleBindingSource.DataSource = currentPeople;

            foreach (var personAndCell in selectedPeopleAndCells)
            {
                foreach (DataGridViewRow row in dataGridViewPeople.Rows)
                {
                    if (string.Equals(row.Cells[0].Value, personAndCell.Person.Id))
                    {
                        row.Cells[personAndCell.Cell.ColumnIndex].Selected = true;
                    }
                }
            }
        }
    }

    public sealed class Person
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }

}