如何从datagridview和数据库中删除选定的行

Question

这个想法是，删除时选择的行将从 datagridview、数据库中删除，然后 datagridview 被刷新。我认为它必须使用 SQL 来完成，但是如何将文本类型的 sql 命令与特定行的删除代码链接起来？ 该数据库由一个表组成，并且数据网格与其绑定。

删除按钮：

private void btnBookRecord_Click(object sender, EventArgs e)
{
    if (this.BooksGrid.SelectedRows.Count > 0)
    {
        foreach (DataGridViewRow dgvrCurrent in BooksGrid.SelectedRows)
        {
            if (dgvrCurrent == BooksGrid.CurrentRow)
            {
                BooksGrid.CurrentCell = null;
            }

            // Delete row code here
        }
    }
}

Answer 1

由于某种原因，即使我从有效的添加按钮复制了刷新代码，datagridview 也不会更新。但它确实从数据库中删除了该记录。

private void deleteRecord()
{
    if (BooksGrid.SelectedRows.Count > 0)
    {
        int selectedIndex = BooksGrid.SelectedRows[0].Index;

        int rowID = int.Parse(BooksGrid[0, selectedIndex].Value.ToString());
        string sql = "DELETE FROM Table1 WHERE RowID = @RowID";

        SqlCommand deleteRecord = new SqlCommand();
        deleteRecord.Connection = Booksconnection;
        deleteRecord.CommandType = CommandType.Text;
        deleteRecord.CommandText = sql;

        SqlParameter RowParameter = new SqlParameter();
        RowParameter.ParameterName = "@RowID";
        RowParameter.SqlDbType = SqlDbType.Int;
        RowParameter.IsNullable = false;
        RowParameter.Value = rowID;

        deleteRecord.Parameters.Add(RowParameter);

        deleteRecord.Connection.Open();

        deleteRecord.ExecuteNonQuery();

        deleteRecord.Connection.Close();

        booksDataset1.GetChanges();

        sqlDataAdapter1.Fill(booksDataset1.Videos);
    }
}

Answer 2

如果只允许在 DataGridView 中进行一项选择，您可以这样做。

假设 DataGridView 中的第一列是数据库中行的标识种子。

if (BooksGrid.SelectedRows.Count > 0)
{
     int selectedIndex = BooksGrid.SelectedRows[0].Index;

     // gets the RowID from the first column in the grid
     int rowID = int.Parse(BooksGrid[0, selectedIndex].Value.ToString());

     string sql = "DELETE FROM Table1 WHERE RowID = @RowID";

     // your code for deleting it from the database

     // then your code for refreshing the DataGridView
}

Answer 3

DataGridView datagridview1;

datagridview1.Rows.remove(datagridview1.SelectedRows[0]);