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我已經創建了一個電子郵件網站表單，用戶可以在其中輸入姓名，電子郵件和消息，然後提交一個按鈕發送。一旦發送電子郵件，頁面上的lblResults將聲明「謝謝。」我想要實現的是，如果頁面被更改，關閉或刷新，則lblResults將返回「」。我能夠完成這項工作，但問題是，當我刷新時，它會重新發送相同的電子郵件。刷新頁面時防止重新提交
在下面的代碼背後我的代碼：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Net.Mail;
public partial class Contact : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Session["ClickedLink"] = "Contact";
if (!IsPostBack)
Session["Check_Page_Refresh"] = DateTime.Now.ToString();
}
protected void Page_PreRender(object sender, EventArgs e)
{
ViewState["Check_Page_Refresh"] = Session["Check_Page_Refresh"];
}
protected void btnSend_Click(object sender, EventArgs e)
{
if (Page.IsValid)
{
string fileName = Server.MapPath("~/App_Data/Contact.txt");
string mailBody = File.ReadAllText(fileName);
mailBody = mailBody.Replace("##Name##", txtName.Text);
mailBody = mailBody.Replace("##Email##", txtEmail.Text);
mailBody = mailBody.Replace("##Message##", txtMessage.Text);
MailMessage myMessage = new MailMessage();
myMessage.Subject = "Response from web site";
myMessage.Body = mailBody;
myMessage.From = new MailAddress("[email protected]", "Sender Name");
myMessage.To.Add(new MailAddress("[email protected]", "Receiver Name"));
myMessage.ReplyToList.Add(new MailAddress(txtEmail.Text));
SmtpClient mySmtpClient = new SmtpClient();
mySmtpClient.Send(myMessage);
txtName.Text = "";
txtEmail.Text = "";
txtMessage.Text = "";
}
if (ViewState["Check_Page_Refresh"].ToString() == Session["Check_Page_Refresh"].ToString())
{
Session["Check_Page_Refresh"] = DateTime.Now.ToString();
lblResults.Text = "Thank you";
}
else
{
lblResults.Text = "";
}
}
}
請注意，我還沒有學會JS尚未所以如果可能的重點將放在HTML5，CSS3，ASP。 NET或C＃。提前致謝。任何建議都會有幫助！
