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c# - 仅当在计算按钮之前单击确认按钮时，如何才能显示 lblmessage？

转载 作者：行者123 更新时间：2023-11-30 23:08:53 24 4
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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Confirm.aspx.cs" Inherits="XEx04Quotation.Confirm" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Confirm quotation</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <script src="Scripts/jquery-1.9.1.min.js"></script>
    <script src="Scripts/bootstrap.min.js"></script>
    <link href="Content/bootstrap.min.css" rel="stylesheet" />
    <link href="Content/site.css" rel="stylesheet" />
</head>
<body>
    <form id="form1" runat="server" class="form-horizontal">

        <main class="container">

            <h1 class="jumbotron">Quotation confirmation</h1>

            <div class="form-group">
                <label class="col-sm-3 control-label">Sales price</label>
                <asp:Label ID="lblSalesPrice" runat="server" CssClass="col-sm-3 bold"></asp:Label>
            </div>

            <div class="form-group">
                <label class="col-sm-3 control-label">Discount amount</label>
                <asp:Label ID="lblDiscountAmount" runat="server" CssClass="col-sm-3 bold"></asp:Label>
            </div>

            <div class="form-group">
                <label class="col-sm-3 control-label">Total price</label>
                <asp:Label ID="lblTotalPrice" runat="server" CssClass="col-sm-3 bold"></asp:Label>
            </div> 

            <div class="row">
                <h3 class="col-sm-offset-2 col-sm-10">Send confirmation to</h3>
            </div>
            
            <div class="form-group">
                <label class="col-sm-3 control-label">Name</label>
                <div class="col-sm-3">
                    <asp:TextBox ID="txtName" runat="server" CssClass="form-control"></asp:TextBox>
                </div>
                <div class="col-sm-6">
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtName" 
                        Display="Dynamic" ErrorMessage="Required" CssClass="text-danger"></asp:RequiredFieldValidator>
                </div>  
            </div>  
            
            <div class="form-group">
                <label class="col-sm-3 control-label">Email address</label>
                <div class="col-sm-3">
                    <asp:TextBox ID="txtEmail" runat="server" CssClass="form-control"></asp:TextBox>
                </div>
                <div class="col-sm-6">
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtEmail" 
                        Display="Dynamic" ErrorMessage="Required" CssClass="text-danger"></asp:RequiredFieldValidator>
                </div>  
            </div>  

            <%-- Quotation and Return buttons --%>
            <div class="form-group">
                <div class="col-sm-offset-3 col-sm-9">
                    <%-- buttons go here --%>
                    <asp:Button ID="Button1" runat="server" Text="Send Quotation"  CssClass="btn btn-primary"/>
                    <asp:Button ID="Button2" runat="server" Text="Return" CssClass="btn btn-primary" PostBackUrl="~/Default.aspx" CausesValidation="false"/>
                </div>
            </div> 
            
            <%-- message label --%>
            <div class="form-group">
                <div class="col-sm-offset-1 col-sm-11">
                    <%-- message label goes here --%>
                    <asp:Label ID="lblmessage" runat="server" Text="Click the Send Quotation button to send the quotation via email" CssClass="text-info"></asp:Label>
                </div>
            </div>

        </main>

    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace XEx04Quotation
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            UnobtrusiveValidationMode = UnobtrusiveValidationMode.None;
        }

        protected void btnCalculate_Click(object sender, EventArgs e)
        {
            if (IsValid)
            {
                decimal salesPrice = Convert.ToDecimal(txtSalesPrice.Text);

                // save the salesPrice into a session state variable 
                Session["SalesPrice"] = salesPrice;


                decimal discountPercent = Convert.ToDecimal(txtDiscountPercent.Text) / 100;

    
                decimal discountAmount = salesPrice * discountPercent;

                // save the discountAmount into a session state variable
                Session["Discount"] = discountAmount;

                
                decimal totalPrice = salesPrice - discountAmount;

                // save the totalPrice into a session state variable

                Session["TotalPrice"] = totalPrice;

                lblDiscountAmount.Text = discountAmount.ToString("c");
                lblTotalPrice.Text = totalPrice.ToString("c");
            }   
        }

        protected void Button1_Confirm(object sender, EventArgs e)
        {
             if(Session["SalesPrice"] != null)
            {
                Response.Redirect("Confirm.aspx");
            }
            else 
            {
                // This is the part I am concerned about
                lblmessage2.Text = "Click the Calculate button before you click confirm";
            }
            


        }
    }
}

大家好，

我正在使用 Default.aspx、Default.aspx.cs 以及 Confirm.aspx 和 Confirm.aspx.cs 构建多 Web 应用程序页面。我遇到的问题是，当我在单击“计算”之前单击“确认”时，事件处理程序会在页面底部显示“在确认之前单击计算按钮”。即使在确认之前单击了计算按钮，它也会这样做，并且在我重新加载页面时也会再次显示。 如果 SalesPrice 的 session 状态值为空，我怎样才能让它只显示？否则，它将重定向到确认页面。这是 Default.aspx.cs 和其他文件:

最佳答案

你只能做一件事。如果你想先得到总计算，然后禁用确认按钮，点击计算按钮将启用按钮，如下所示:

<asp:Button ID="Button1" runat="server" Enabled="false" />

protected void btnCalculate_Click(object sender, EventArgs e)
{
   Button1.Enabled = True;

   if(Session["TotalPrice"] != null)
   {
       lblMsg.Text = "Please click here to see total calculation";
   }
}

protected void Button1_Confirm(object sender, EventArgs e)
{
   if(Session["SalesPrice"] != null)
   {
       Response.Redirect("Confirm.aspx");
   }
}

注意:请遵循事件名称的命名约定。 Button1 到btnConfirm。

更新 1 - 尝试以下测试代码:

<asp:Button ID="btnCalculate" runat="server" Text="Calculate" OnClick="btnCalculate_Click" />

<asp:Button ID="btnConfirm" runat="server" Text="Confirm" OnClick="btnConfirm_Click" />

<asp:Label ID="lblMsg" runat="server"></asp:Label>


private int buttonWasClicked = 0; //Kept a variable type of int and with a default value 0

protected void btnCalculate_Click(object sender, EventArgs e)
{
   buttonWasClicked = 1; //If clicked, then 1
   Session["value"] = Convert.ToInt32(buttonWasClicked); //Then kept in session

   lblMsg.Text = "Total Price - 10,000";
}

protected void btnConfirm_Click(object sender, EventArgs e)
{
   if (Session["value"] != null) //If session not null, then redirect page
   {
      Response.Redirect("CustomerDetails.aspx");
      Session["value"] = null; //Clears the session
   }
   else
   {
      lblMsg.Text = "Click the calculate button first";
   }
}

关于c# - 仅当在计算按钮之前单击确认按钮时，如何才能显示 lblmessage？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46266082/

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