如何在特定面板中生成验证码？

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问题描述

我使用了 [ ]在我的网站上实现验证码。

代码似乎工作正常，但验证码出现在另一个/空白页面上。

此外，使用下面的代码，但是当生成验证码时，textfields en按钮不可见。任何人都可以帮我吗？

Hi,

I have used the code from [Code_Project] to implement captcha in my website.

The code seems to work fine, but the captcha appears on a different/blank page.
Also, the code below is used, but when the captcha is generated, the textfields en button aren't visible. Can anyone help me out here?

<asp:Panel ID="P_LastStepOrder" runat="server" Visible="false">
    <div style="width: 400px; float:left; margin-left:15px">
        <fieldset style=" width:350px">
            <legend>Customer Contact Info</legend>
            <asp:Label ID="L_CustName" runat="server" Width="200px" Text="Customer name:"></asp:Label>
            <br />
            <asp:TextBox ID="TB_CustName" runat="server" Width="200px"></asp:TextBox>
            <br />
            <asp:Label ID="L_CustEmail" runat="server" Width="200px" Text="Customer email address:"></asp:Label>
            <br />
            <asp:TextBox ID="TB_CustEmail" runat="server" Width="200px"></asp:TextBox>
            <br />
            <br />
            <div>
                 <asp:Label ID="L_CaptchaCheck" runat="server" Font-Bold="True" ForeColor="Red" Text=""></asp:Label>
                 <br />
            </div>
            <asp:TextBox ID="TB_CaptchaImageCode" runat="server"></asp:TextBox>
            <br />
            <asp:Image ID="I_Captcha" runat="server" ImageUrl="~/Webpages/ShoppingCart.aspx"/>
            <br />
            <asp:ImageButton ID="IB_SubmitOrder" runat="server" CausesValidation="False" ImageUrl="~/Images/IB_SubmitOrder.jpg"

                            ToolTip="Submit order" Height="50px" Width="180px" OnClick="Email"/>
        </fieldset>
    </div>
</asp:Panel>

这些标签等位于单击按钮后我设置的面板，也会触发load_Captcha代码。我也注意到图像I_Captcha的指定ImageUrl根本没有做任何事情。

祝你好运，

Mati

These labels etc are located in a Panel which I set visible as soon as a button is clicked, which also triggers the load_Captcha code. I've also noticed that the specified ImageUrl for image I_Captcha does not do anything at all.

Best regards,
Mati

推荐答案

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

namespace x.Webpages
{
    public partial class JpegImageCaptcha : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            // Create a random code and store it in the Session object.
            this.Session["CaptchaImageText"] = GenerateRandomCode();
            // Create a CAPTCHA image using the text stored in the Session object.
            RandomImage ci = new RandomImage(this.Session["CaptchaImageText"].ToString(), 300, 75);
            // Change the response headers to output a JPEG image.
            this.Response.Clear();
            this.Response.ContentType = "image/jpeg";
            // Write the image to the response stream in JPEG format.
            ci.Image.Save(this.Response.OutputStream, ImageFormat.Jpeg);
            // Dispose of the CAPTCHA image object.
            ci.Dispose();
        }

        // Function to generate random string with Random class.
        private string GenerateRandomCode()
        {
            Random r = new Random();
            string s = "";
            for (int j = 0; j < 5; j++)
            {
                int i = r.Next(3);
                int ch;
                switch (i)
                {
                    case 1:
                        ch = r.Next(0, 9);
                        s = s + ch.ToString();
                        break;
                    case 2:
                        ch = r.Next(65, 90);
                        s = s + Convert.ToChar(ch).ToString();
                        break;
                    case 3:
                        ch = r.Next(97, 122);
                        s = s + Convert.ToChar(ch).ToString();
                        break;
                    default:
                        ch = r.Next(97, 122);
                        s = s + Convert.ToChar(ch).ToString();
                        break;
                }
                r.NextDouble();
                r.Next(100, 1999);
            }
            return s;
        }
    }
}

网页的ASP.NET部分没有添加任何内容。

KR

Nothing was added in the ASP.NET part of the webpage.

KR

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