Question

以下是该按钮的代码，但是当我单击该按钮时，它不会将我转发到所需的页面。

我的DataReader循环有问题吗？

{
    SqlConnection connBadge = new SqlConnection("Data Source =localhost;" +
                       "Initial Catalog = BreastCancer; Integrated Security = SSPI");
    connBadge.Open();

    SqlCommand cmdfBadge = new SqlCommand("SELECT * FROM Products WHERE pid=1", connBadge);
    SqlDataReader dr;

    dr = cmdfBadge.ExecuteReader();

    while (dr.Read())
    {
        String pName = dr["pName"].ToString();
        String pPrice = dr["pPrice"].ToString();

        int b = Convert.ToInt16(pPrice);
        int a = Convert.ToInt16(ddQty1.SelectedValue.ToString());
        int g = a * b;

        String Badge = "INSERT into Cart (Name,Price,Quantity,gPrice) Values('" + pName + "', '" + b + "', '" + a + "','" + g + "')";

        SqlCommand cmdBadge = new SqlCommand(Badge, connBadge);

        cmdBadge.ExecuteNonQuery();
    }

    dr.Close();
    connBadge.Close();

    Response.Redirect("Cart.aspx");        
}

Answer 1

使用try / catch语句包装代码以查看是否抛出任何异常。

Answer 2

使用参数并尝试使用sqldata适配器：

{
    SqlConnection connBadge = new SqlConnection("Data Source =localhost;" +
                       "Initial Catalog = BreastCancer; Integrated Security = SSPI");
    connBadge.Open();

    SqlCommand cmdfBadge = new SqlCommand("SELECT * FROM Products WHERE pid='1'", connBadge);

    var dSet = new DataSet();
    var dt = new Datatable();
    var da = new SqlDataAdapter(cmdfBadge);

    da.Fill(dSet);
    dt = dSet.Tables[0];

    foreach(Datarow a in dt.Rows)
    {
        String pName = a["pName"].ToString();
        String pPrice = a["pPrice"].ToString();

        int b = Convert.ToInt16(pPrice);
        int a = Convert.ToInt16(ddQty1.SelectedValue.ToString());
        int g = a * b;

        String Badge = "INSERT into Cart (Name,Price,Quantity,gPrice) Values(@Name,@Price,@Quantity,@gPrice)";

        SqlCommand cmdBadge = new SqlCommand(Badge, connBadge);

        sqlCommand.Addwithvalue("@Name",pName);
        sqlCommand.Addwithvalue("@Price",b)
        sqlCommand.Addwithvalue("@Quantity",a)
        sqlCommand.Addwithvalue("@gPrice",g)
        cmdBadge.ExecuteNonQuery();
    }            

    connBadge.Close();

    Response.Redirect("Cart.aspx");
}

此致

Answer 3

验证你的insert语句，我相信如果你的价格，数量和gprice的数据类型是整数类型，它将会失败：

String Badge = "INSERT into Cart (Name,Price,Quantity,gPrice) Values('" + pName + "', '" + b + "', '" + a + "','" + g + "')";

您不应将它们用引号括起来，删除引号然后重试。

String Badge = "INSERT into Cart (Name,Price,Quantity,gPrice) Values('" + pName + "', " + b + ", " + a + "," + g + ")";

将来尝试使用描述性变量名，using语句和try-catch语句。

按钮无法转发到下一页

3 个答案: