Question

尝试让gridview检查每一行的复选框，然后将该记录添加到＆＃34;购物车＆＃34;如果检查表。当用户单击按钮时，逻辑设置为触发。我知道打开和关闭每个循环可能效率不高，但是我无法想到另一种方法，并且仍然会在每个循环中修改参数。

 protected void ShoppingCartButton_Click(object sender, EventArgs e)
{
//set up connectionstring and oledbconnection
    OleDbConnection myconn = new OleDbConnection();
        myconn.ConnectionString =     "Provider=Microsoft.ACE.OLEDB.12.0;Data     Source=|DataDirectory|\\ProjectDatabase.accdb";

    string UserID = Session["UserID"].ToString();
//retrieves the UserID for the session.  If no userid is present, the     button won't be visible to the user(in page load)

    foreach (GridViewRow row in GridView1.Rows)
//checks row by row
    {
        string unpredictable = "";
//checks where a checkbox is checked
        CheckBox chkCtrl1 = (CheckBox)row.FindControl("chkCtrl");
             if (chkCtrl1.Checked)
          {  //if it is, grabs the gameid and puts it into the string
                    unpredictable = row.Cells[1].Text;
//declared the oledbcommand here
              OleDbCommand cmd = new OleDbCommand();
//insert based on username and gameid
cmd.CommandText = "insert into Cart ([Username],[GameID]) values (?,?)";
cmd.Parameters.AddWithValue("@Username", UserID);
cmd.Parameters.AddWithValue("@GameID", unpredictable);
//opens the connection and closes it with each loop   
myconn.Open();
cmd.ExecuteNonQuery();
myconn.Close();

           }




    }

Answer 1

在| DataDirectory |之后删除连接字符串中的反斜杠。还添加：providerName =“System.Data.OleDb”（可能不是必需的）。
您的OleDbCommand不知道连接字符串。将sql移动到一个字符串中：

string sql = "insert into Cart ([Username],[GameID]) values (?,?)";

然后创建命令：

OleDbCommand cmd = new OleDbCommand(sql, myconn);

无法在每行的基础上执行oledbcommand执行

1 个答案: