c# - ASPX 按钮 - 没有任何反应

Question

我在 aspx 页面上有一个应该发送电子邮件的按钮...我的代码似乎设置正确，但是当单击该按钮时，没有任何反应。这是代码。它旨在显示警报然后重定向到成功页面但没有任何反应......

没有onclick，但是按照这个，不应该有:http://www.velocityreviews.com/forums/t367616-using-handles-vb-vs-c.html我从中获得此代码的指南也没有使用 onclick，尽管它已经过时了。

标记是:

<%@ Page Title="Sign Up" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeBehind="signup.aspx.cs" Inherits="WebApplication2._Default" %>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<h2>
    Email Service
</h2>

Re-enter your email address to confirm signup for updates. 
<br />
<table border="0">
<tr>
    <td><b>Email:</b></td>
    <td><asp:TextBox runat="server" ID="UsersEmail" Columns="30"></asp:TextBox></td>
</tr>
<tr>
    <td colspan="2" align="center">
        <asp:Button runat="server" ID="SendEmail" Text="Sign Up"/>
    </td>
</tr>
</table>

代码隐藏是:

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void SendEmail_Click(object sender, EventArgs e) //Handles SendEmail.Click
    {
        try
        {
            //!!! UPDATE THIS VALUE TO YOUR EMAIL ADDRESS
            string ToAddress = "info@removed.org";

            //(1) Create the MailMessage instance
            MailMessage mm = new MailMessage(UsersEmail.Text, ToAddress);

            //(2) Assign the MailMessage's properties

            mm.Subject = UsersEmail.Text + " would like to sign up for updates";
            mm.Body = "Hello, I would like to sign up for updates. My email is " + UsersEmail.Text + ". Thank you.";
            mm.IsBodyHtml = false;

            //(3) Create the SmtpClient object
            SmtpClient smtp = new SmtpClient("[removed]");
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;

            //(4) Send the MailMessage (will use the Web.config settings)
            smtp.Send(mm);
        }
        catch (Exception ex)
        {
            string strError = "<Script language=javascript>alert('Error');</Script>";
            Response.Write(strError);
            Response.Redirect("Success.aspx");

        }

        string strMsg = "<Script language=javascript>alert('Emailsent');</Script>";
        Response.Write(strMsg);
        Response.Redirect("Success.aspx");

        //System.Web.HttpContext.Current.Response.Write("<SCRIPT LANGUAGE=""JavaScript"">alert(""Hello this is an Alert"")</SCRIPT>");
    }

}

我真的怀疑 onclick 是否是解决方案，因为它不处理任何代码..

有什么想法吗？谢谢。

Answer 1

将处理程序添加到事件

<asp:Button runat="server" ID="SendEmail" Text="Sign Up" OnClick="SendEmail_Click"/>

下一步:

如果你这样做:

catch (Exception ex)
        {
            string strError = "<Script language=javascript>alert('Error');</Script>";
            Response.Write(strError);
            Response.Redirect("Success.aspx");

        }

您不会对错误一无所知，第一个原因是因为进行了重定向，所以 javascript 代码将没有机会运行，第二个原因是像这样捕获异常，但什么都不做，您将丢失如何修复它的说明。

如果您认为它会膨胀，则无需在标记中设置处理程序。你肯定可以在代码中做到这一点

public class _Default : System.Web.Page

{
    public _Default()
    {
         this.Init += (_o, _e) =>
          {
              SendEmail.Click += SendEmail_Click;
          };
    }
}