C#字典中的动态SMTP实例和线程

我撞到另一面墙了。请回顾我之前关于多线程和SMTP的问题

无论如何，我试图在运行时动态创建线程并调用Start（）方法，但收到一个KeyNotFoundException。对此有任何见解都将不胜感激。如果我的代码与此相去甚远，基本上我希望完成的是根据用户输入（计数）创建一个在单个线程上运行的唯一SMTP实例，并同时运行每个线程

//count is user input (number of messages)  

int instanceCount = 0;

        var vartable = new Dictionary<string, SmtpClient>();
        var vartable2 = new Dictionary<string, Thread>();

        for (int i = 0; i < count; ++i)
        {
            vartable[instanceCount.ToString()] = new SmtpClient
            {
                Host = txtBxSenderHost.Text,
                Port = 587,
                EnableSsl = true,
                DeliveryMethod = SmtpDeliveryMethod.Network,
                UseDefaultCredentials = false,
                Credentials = new NetworkCredential(strSenderAddress, strSenderPassword)
            };

            vartable2[instanceCount.ToString()] = new Thread(delegate()
            {
                using (var message = new MailMessage(senderAdrress, toAddress)
                {
                    Subject = strSubject,
                    Body = strBody
                })

                {
                    {
                        ((SmtpClient)vartable[instanceCount.ToString()]).Send(message);
                    }
                }
            });

            instanceCount++;
        }

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在委托内部存储循环变量时，需要在委托外部声明一个单独的变量，以避免接收迭代的最后一个值

如果您制作一个print语句，您将看到每个线程试图访问的值都是相同的，无论count的值是什么。只需在委托语句上方添加一个变量：

        int tempInstanceCount = instanceCount;
        vartable2[instanceCount.ToString()] = new Thread(delegate()
        {
            using (var message = new MailMessage(senderAdrress, toAddress)
            {
                Subject = strSubject,
                Body = strBody
            })

            {
                {
                    ((SmtpClient)vartable[tempInstanceCount.ToString()]).Send(message);
                }
            }
        });

---

您需要先向词典中添加一条记录，不能直接用[“”]引用它

        int tempInstanceCount = instanceCount;
        vartable2[instanceCount.ToString()] = new Thread(delegate()
        {
            using (var message = new MailMessage(senderAdrress, toAddress)
            {
                Subject = strSubject,
                Body = strBody
            })

            {
                {
                    ((SmtpClient)vartable[tempInstanceCount.ToString()]).Send(message);
                }
            }
        });