c# - 无法通过 DataBoundItem 更新 DataGridView 单元格？

Question

我创建了一个包含两个控件 dataGridView1 和 button1 的表单。

public partial class Form1 : Form
{
    public List<Foo> ds { get; private set; }

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        ds = new List<Foo> {
            new Foo { A="abc" }, new Foo{B="bbb"}
        };
        dataGridView1.DataSource = new BindingList<Foo>(ds);
    }

    private void button1_Click(object sender, EventArgs e)
    {
        var foo = (Foo)dataGridView1.Rows[0].DataBoundItem;
        foo.B = "1BBB";
        foreach(DataGridViewRow x in dataGridView1.Rows)
        {
            if (x.DataBoundItem != null)
                ((Foo)x.DataBoundItem).C = "CCC";
        }
    }
}

但是，单击 button1 不会在表单中显示更改的值吗？在 Visual Studio 中调试显示已设置值。

---

更新:

我将代码更改为以下以使用 DataTable。但是，点击按钮仍然没有更新 UI？

public partial class Form1 : Form
{
    public List<Foo> ds { get; private set; }

    private Dictionary<string, Foo> dict;

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        //ds = new List<Foo> {
        //    new Foo { A="abc" }, new Foo{B="bbb"}
        //};
        //dataGridView1.DataSource = new BindingList<Foo>(ds);
        var dt = new DataTable();
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "A", Unique = true });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "B", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "C", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "D", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "E", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "F", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "G", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "H", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "I", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "J", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "K", Unique = false });
        dt.Columns.Add(new DataColumn { DataType = typeof(string), ColumnName = "L", Unique = false });
        dt.PrimaryKey = new DataColumn[] { dt.Columns["A"] };

        var row = dt.NewRow();
        row["A"] = "1";
        dt.Rows.Add(row);
        row = dt.NewRow();
        row["A"] = "2";
        dt.Rows.Add(row);
        row = dt.NewRow();
        row["A"] = "3";
        dt.Rows.Add(row);
        dataGridView1.DataSource = dt;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        var foo = (DataRowView)dataGridView1.Rows[0].DataBoundItem;
        foo["B"] = "1BBB";
        //foreach (DataGridViewRow x in dataGridView1.Rows)
        //{
        //    if (x.DataBoundItem != null)
        //        ((Foo)x.DataBoundItem).C = "CCC";
        //}
        //dataGridView1.DataSource = ds;
    }
}

Answer 1

更改值后添加“EndEdit”:

private void button1_Click(object sender, EventArgs e)
    {
        var foo = (DataRowView)dataGridView1.Rows[0].DataBoundItem;
        foo["B"] = "1BBB";
        foo.EndEdit();
    }

您也可以将源更改为绑定(bind)源，然后直接在表格上工作。