C# 将datagridview的所有数据插入数据库C

我有一个datagridview，它是通过各种操作和用户对数据的操作创建的。我想一次将gridview的所有数据插入数据库，我知道我可以尝试以下类似的代码：

private void btnSaveProducts_Click(object sender, EventArgs e)
{
    SqlConnection connection = DBConnectivity.getConnection();
    if (connection != null)
    {
        try
        {
            for (int i = 0; i < dGvProducts.Rows.Count; i++)
            {
                string query = "INSERT INTO product (productName) " + "VALUES (@productName)";
                SqlCommand command = DBConnectivity.getCommandForQuery(query, connection);
                    int result = command.ExecuteNonQuery();
                    Console.WriteLine(result + "");
            }
            //  string query = "Insert into units(name,packing)values('" + txtNameUnit.Text + "' , '" + txtPackingUnit.Text + "')";
            //  SqlCommand command = DBConnectivity.getCommandForQuery(query, connection);
            //  int result = command.ExecuteNonQuery();
            //  Console.WriteLine(result + "");
        }
        catch (Exception ex)
        {
        }
        finally
        {
            connection.Close();    
        }
    }       
}

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按原样，代码尝试执行参数化查询，但从不为参数赋值。即使您这样做，也永远不会提取单元格值

代码应该如下所示：

var query = "INSERT INTO product (productName) VALUES (@productName)";

using var(connection = DBConnectivity.getConnection())
using(var command = new SqlCommand(query, connection))
{
    var productParam=command.Parameters.Add("@productName",SqlDbType.NVarChar,50);

    connection.Open();
    for (int i = 0; i < dGvProducts.Rows.Count; i++)
    {                    
        var productName=dGvProducts.Rows[i].Cells[somecolumn].Value;
        productParam.Value=productName;
        int result = command.ExecuteNonQuery();
        Console.WriteLine(result);
    }       
}

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我看不出有问题。先生，请编写此代码，但无法在数据库表中插入值。您得到的错误是什么？ExecuteOnQuery的结果是什么？您能在catch块中写出异常消息吗？您的连接打开了吗？