Question

private void button3_Click(object sender, EventArgs e)
{
    foreach (DataGridViewRow item in dataGridView1.Rows)
    {
        if (bool.Parse(item.Cells[0].Value.ToString()))
        {
                MessageBox.Show("Selected Rows  :  " + item.Cells[0].RowIndex.ToString());
        }
    }
}

Answer 1

尝试以下代码

    protected void btnDelete_Click(object sender, EventArgs e)
    {
        foreach (GridViewRow gvrow in gvDetails.Rows)
        {
            //Finiding checkbox control in gridview for particular row using below syntax
            CheckBox chkdelete = (CheckBox)gvrow.FindControl("chkSelect");
            //Condition to check checkbox selected or not
            if (chkdelete.Checked)
            {
                //Getting UserId of particular row using datakey value
                int usrid = Convert.ToInt32(gvDetails.DataKeys[gvrow.RowIndex].Value);
                using (SqlConnection con = new SqlConnection("Data Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB"))
                {
                    con.Open();
                    SqlCommand cmd = new SqlCommand("delete from UserDetails where UserId=" + usrid, con);
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
            }
        }
        BindUserDetails();
    }

如果您想了解更多信息，请参阅以下链接

http://tinyurl.com/jgw33xs

Answer 2

单击button3时，将执行以下事件处理程序。它首先使用LINQ查询从DataGridView获取已检查（选定）的行，然后显示确认消息框。

如果用户单击是按钮，则会对所选（已选中）行执行循环，并使用Id字段从数据库表中删除逐个记录。

注意：这里采取的数据库查询是让OP了解他是如何实现它的，因为OP在他的帖子中没有提及任何内容，这将是一种更好地解释的方式

   private void button3_Click(object sender, EventArgs e)
    {
        List<DataGridViewRow> selectedRows = (from row in dataGridView1.Rows.Cast<DataGridViewRow>()
                                                where Convert.ToBoolean(row.Cells["checkBoxColumn"].Value) == true
                                                select row).ToList();
        if (MessageBox.Show(string.Format("Do you want to delete {0} rows?", selectedRows.Count), "Confirmation", MessageBoxButtons.YesNo) == DialogResult.Yes)
        {
            foreach (DataGridViewRow row in selectedRows)
            {
                using (SqlConnection con = new SqlConnection(ConnectionString))
                {
                    using (SqlCommand cmd = new SqlCommand("DELETE FROM Customers WHERE CustomerId = @CustomerId", con))
                    {
                        cmd.CommandType = CommandType.Text;
                        cmd.Parameters.AddWithValue("@CustomerId", row.Cells["CustomerId"].Value);
                        con.Open();
                        cmd.ExecuteNonQuery();
                        con.Close();
                    }
                }
            }

            this.BindGrid();
        }
    }

Answer 3

试试这段代码，它对我有用：

            int j = 0;
            int countRows = dataGridView1.Rows.Count;

            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                if (Convert.ToBoolean(dataGridView1.Rows[i]
                                      .Cells[0].Value) == true)
                {
                    dataGridView1.Rows.RemoveAt(i);
                }

                i = i - 1;
                j = j + 1;

                if (j == countRows)
                {
                    break;
                }
            }

Answer 4

当您删除一行时，首先删除该行，datagrid行的大小的新值总计减去1，因此我使用的是i - 。为什么要使用条件＆＃34; if（i＆lt; dataGridView1.Rows.Count -1）＆＃34;因为只有当行[i]为1而不是0时才需要减去。

您可以使用try catch而不是条件。

祝你好运！

    private void button3_Click(object sender, EventArgs e)
    {
        for (int i = 0; i <= dataGridView1.Rows.Count -1; i++)
        {
            if ((bool)dataGridView1.Rows[i].Cells[0].Value == true)
            {
                dataGridView1.Rows.Remove(dataGridView1.Rows[i]);
                if (i < dataGridView1.Rows.Count -1)
                {
                    i--;
                }

            }
        }
    }

我想使用复选框删除datagridview上的多个数据

4 个答案: