使用 OpenPop.dll 错误读取 gmail c#

Question

我正在尝试使用 OpenPop.dll 从 c# 中的 gmail 中读取电子邮件正文。我试过 gmail api，但我永远无法让它工作，所以我试了这个。无论如何，这是我的代码和我得到的错误。

            using (Pop3Client client = new Pop3Client())
            {
                client.Connect("pop.gmail.com", 995, true);
                client.Authenticate("signalxxxxxx@gmail.com", "xxxxxxxx", AuthenticationMethod.UsernameAndPassword);
                int messageCount = client.GetMessageCount();
                List<OpenPop.Mime.Message> allMessages = new List<OpenPop.Mime.Message>(messageCount);
                for (int d = messageCount; d > 0; d--)
                {
                    allMessages.Add(client.GetMessage(i));
                }

allMessages.Add 部分给出的错误。（运行时）

An unhandled exception of type 'OpenPop.Pop3.Exceptions.InvalidUseException' occurred in OpenPop.dll

Additional information: The messageNumber argument cannot have a value of zero or less. Valid messageNumber is in the range [1, messageCount]

Answer 1

您可能在另一个 for 循环中使用了这段代码，并且弄错了索引变量。 GetMessage方法中的参数应该是d，而不是i。它应该是这样的：

using (Pop3Client client = new Pop3Client())
{
     client.Connect("pop.gmail.com", 995, true);
     client.Authenticate("signalxxxxxx@gmail.com", "xxxxxxxx", AuthenticationMethod.UsernameAndPassword);
     int messageCount = client.GetMessageCount();
     List<OpenPop.Mime.Message> allMessages = new List<OpenPop.Mime.Message>(messageCount);
     for (int d = messageCount; d > 0; d--)
     {
          allMessages.Add(client.GetMessage(d));
     }
}

使用 OpenPop.dll 错误读取 gmail c#

Reading gmail using OpenPop.dll errors c#

c#

gmail-pop