显示 DataGridView 的已删除行的索引

Question

我想在我的 datagridview 的第二列中显示已删除行的索引。

private void btn_Verify_Click(object sender, EventArgs e)
        {
            var dataA = new HashSet<string>();
            var dataB = new HashSet<string>();
            var exceptA = dataA.Except(dataB);
            var exceptB = dataB.Except(dataA);
            for (int i = 1; i < dgv_A.Rows.Count; i++)
            {
                dataA.Add(dgv_A[8, i].Value.ToString());
            }
            for (int i = 1; i < dgv_B.Rows.Count; i++)
            {
                dataB.Add(dgv_B[8, i].Value.ToString());
            }
            if (dataA.SetEquals(dataB))
            {
                lbl_result.Text = "Certifications are correct";
            }
            else
            {
                lbl_result.Text = "Certifications are incorrect";

//A function is created as the DataGridView expects the object to generate the column.
                dgv_B.DataSource = exceptB.Select(s => new { Value = s }).ToList();
                dgv_A.DataSource = exceptA.Select(s => new { Value = s }).ToList();

                dgv_B.Columns[0].HeaderText = "Deleted Files from First Archive";
                dgv_A.Columns[0].HeaderText = "Deleted Files from Second Archive";
            }
        }

这是如果 HashSet 不相等的结果，我想在每个 DataGridView 中添加第二列，并删除行的索引，欢迎所有想法。

Answer 1

我假设您要显示的index来自该项目在原始列表中的位置。

您可以通过使用HashSet<(string, int)>来存储信息，然后在annonymous中使用具有两个字段的匿名select来实现此目的

private void btn_Verify_Click(object sender, EventArgs e)
{
    var dataA = new HashSet<(string, int)>();
    var dataB = new HashSet<(string, int)>();
    var exceptA = dataA.Except(dataB);
    var exceptB = dataB.Except(dataA);
    for (int i = 1; i < dgv_A.Rows.Count; i++)
    {
        dataA.Add((dgv_A[8, i].Value.ToString(), i));
    }
    for (int i = 1; i < dgv_B.Rows.Count; i++)
    {
        dataB.Add((dgv_B[8, i].Value.ToString(), i));
    }
    if (dataA.SetEquals(dataB))
    {
        label1.Text = "Certifications are correct";
    }
    else
    {
        label1.Text = "Certifications are incorrect";

        //A function is created as the DataGridView expects the object to generate the column.
        dgv_B.DataSource = exceptB.Select(s => new { s.Item1, s.Item2 }).ToList();
        dgv_A.DataSource = exceptA.Select(s => new { s.Item1, s.Item2 }).ToList();

        dgv_B.Columns[0].HeaderText = "Deleted Files from First Archive";
        dgv_A.Columns[0].HeaderText = "Deleted Files from Second Archive";
    }
}

话虽这么说，我认为您的代码中有一个错误，因为您的循环遍历数据网格从索引 1 开始，因此即使第一项被删除，您也永远无法添加第一项 - 但这与您的问题无关。