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我正在使用ASP.NET Web Form發送兩封電子郵件，一旦發送了兩封電子郵件，我正在從系統中刪除該文件。我的代碼使用異步/等待，並在控制檯應用程序中正常工作，但是當我將相同的代碼移到asp.net web窗體時，它發送電子郵件，但在Task.WaitAll（emailSender1，emailSender2）後沒有得到任何響應，因此，該文件不會被刪除，並且瀏覽器始終會看到正在加載。我試圖解決這個問題，但最終無法解決。我需要一些人幫助解決這個問題或任何可以完成的替代方法。我的代碼如下：總是在ASP.NET Web窗體的瀏覽器中使用async/await加載頁面
Default.aspx的
<%@ Page Language="C#" AutoEventWireup="true" Async="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1.Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="btnSendEmail" runat="server" Text="Send Email" OnClick="btnSendEmail_Click" />
</div>
</form>
</body>
</html>
Default.aspx.cs背後
using System;
namespace WebApplication1
{
public partial class Default : System.Web.UI.Page
{
private static string filePath = @"C:\Uploads\";
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSendEmail_Click(object sender, EventArgs e)
{
Sender mailSender = new Sender();
mailSender.SendEmail("[email protected]", "[email protected]", "Async mail with attachment", "Async mail with attachment body goes here ...", filePath + "TestFile.txt");
Response.Redirect("Succcess.apsx");
}
}
}
Sender.cs代碼
using System.IO;
using System.Net.Mail;
using System.Text;
using System.Threading.Tasks;
namespace WebApplication1
{
public class Sender
{
public void SendEmail(string toEmail, string logMail, string title, string body, string attachmentPath)
{
var emailSender1 = SendEmailAsync(toEmail, title, body, attachmentPath);
var emailSender2 = SendEmailAsync(logMail, "Copy of " + title, body, attachmentPath);
Task.WaitAll(emailSender1, emailSender2);
// deleting file
File.Delete(attachmentPath);
}
public async Task SendEmailAsync(string toEmail, string title, string body, string attachmentPath)
{
// class to hold all values from the section system.net/mailSettings/smtp in app.config
MailConfiguration smtpSection = new MailConfiguration();
using (MailMessage mailMsg = new MailMessage("<" + smtpSection.FromAddress + ">", toEmail))
{
mailMsg.IsBodyHtml = true;
mailMsg.Subject = title;
mailMsg.SubjectEncoding = Encoding.UTF8;
mailMsg.Body = body;
mailMsg.BodyEncoding = Encoding.UTF8;
if (!string.IsNullOrWhiteSpace(attachmentPath) && File.Exists(attachmentPath))
{
Attachment attachment = new Attachment(attachmentPath);
mailMsg.Attachments.Add(attachment);
}
using (SmtpClient smtpClient = new SmtpClient())
{
smtpClient.Timeout = 1000000;
smtpClient.UseDefaultCredentials = false;
await smtpClient.SendMailAsync(mailMsg);
}
}
}
}
}
個MailConfiguration.cs
public class MailConfiguration
{
private SmtpSection smtpSection = (ConfigurationManager.GetSection("system.net/mailSettings/smtp")) as SmtpSection;
public string ConfigurationFileName
{
get
{
try
{
return smtpSection.ElementInformation.Source;
}
catch (Exception)
{
return "";
}
}
}
public string FromAddress
{
get
{
return smtpSection.From;
}
}
public string Host
{
get
{
return smtpSection.Network.Host;
}
}
public int Port
{
get
{
return smtpSection.Network.Port;
}
}
public int TimeOut
{
get
{
return 2000;
}
}
public override string ToString()
{
return "From: [" + FromAddress + "] Host: [" + Host + "] Port: [" + Port + "]";
}
}
你已經嘗試過了_without_'異步= 「真」'在視圖？ – benjrb
是的，我做了，它給出了一個異常「InnerException = {」此時異步操作無法啓動。異步操作只能在異步處理程序或模塊內啓動，或者在頁生命週期中的某些事件期間啓動。如果執行頁面時發生此異常，請確保不包含「如果Anync =」true「 – Simant
您真的不應該混用此異步代碼和非異步代碼，請執行所有異步或異步代碼。 – mason