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我试图从数据库中获得库存产品的TotalQuantity,并将其用作范围验证器的最大值,同时添加产品到购物车。 我使用的代码在前端:从数据库asp.net动态获取范围验证器的最大值并将其转换为int
<td class="style2">
QUANTITY<br />
<asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="TextBox1" ErrorMessage="must fill some value"></asp:RequiredFieldValidator>
<asp:RangeValidator ID="RangeValidator1" runat="server"
ControlToValidate="TextBox1" ErrorMessage="must fill value lesser than the Total Quantity in stock"
MaximumValue="<%=maxValue %>" MinimumValue="1" Display="Dynamic" ></asp:RangeValidator>
<br />
后端CS代码是:
public partial class productDetail : System.Web.UI.Page
{
public int maxValue=0;
public int minValue = 1;
.....
protected void Page_Load(object sender, EventArgs e)
{
//Defined SQL Conn string...
connection1.Open();
string cartCmd = "select TotalQuantity from Product where ProductName= \'"+prodName+"\';";
SqlCommand cmd = new SqlCommand(cartCmd, connection1);
SqlDataReader readerTotQquantity = cmd.ExecuteReader();
if (readerTotQquantity .HasRows)
{
readerTotQquantity .Read();
TotalQuantity = readerTotQquantity ["TotalQuantity"].ToString();
}
double val = Convert.ToDouble(TotalQuantity);
maxValue = (int)val;
// also tried maxValue=Convert.ToInt32(TotalQuantity);
// tired maxValue=int.Parse(TotalQuantity); etc
connection1.Close();
}
}
我累打印在Visual Studio输出面板上的值,并将其显示正确的值和所述键入System.Int32。但页面上的错误显示为 “MaximumValue <%= maxValue%>不能小于RangeValidator1的MinimumValue 1”。
我也尝试了多次向RangeValidator添加/删除Type =“Integer”,但错误仍然存在。请帮助我,因为这花了我几个小时的时间试图找出它出错的地方。
为我工作。非常感谢! – user3387677