如何使用openpop.net下載多個附件

Question

我正在嘗試使用openpop.net創建pop3電子郵件客戶端。 以下是我在下載功能已經嘗試（從GridView控件的模板字段）：

[Serializable] 
    public class Email 
    { 
     public Email() 
     { 
      this.Attachments = new List<Attachment>(); 
     } 
     public string Uuid { get; set; } 
     public int MessageNumber { get; set; } 
     public string From { get; set; } 
     public string Subject { get; set; } 
     public string Body { get; set; } 
     public DateTime DateSent { get; set; } 
     public List<Attachment> Attachments { get; set; } 
    } 

    [Serializable] 
    public class Attachment 
    { 
     public string FileName { get; set; } 
     public string ContentType { get; set; } 
     public byte[] Content { get; set; } 
    } 

    public partial class Form1 : System.Web.UI.Page 
    { 
     protected void Page_Load(object sender, EventArgs e) 
     { 

     } 

     protected List<Email> Emails 
     { 
      get { return (List<Email>)ViewState["Emails"]; } 
      set { ViewState["Emails"] = value; } 
     } 


     private void Read_Emails() 
     { 
      Pop3Client pop3Client = new Pop3Client(); 
      pop3Client.Connect(txtMailAccount.Text, 995, true); 
      pop3Client.Authenticate(txtUsername.Text, txtPassword.Text, AuthenticationMethod.TryBoth); 
      Session["Pop3Client"] = pop3Client; 
      int count = pop3Client.GetMessageCount(); 
      this.Emails = new List<Email>(); 
      DataSet ds = new DataSet(); 
      ds = DB.ExecuteQuery_SP("getAllSeenUuids"); 
      List<string> uuids = pop3Client.GetMessageUids(); 
      List<string> listSeenUuids = new List<string>(); 
      List<string> newListSeenUuids = new List<string>(); 
      List<Message> newMessages = new List<Message>(); 
      List<string> listUnreadUuids = new List<string>(); 
      for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 
      { 
       listSeenUuids.Add(ds.Tables[0].Rows[i][0].ToString()); 
      } 
      int uuidCounter = 0; 
      for (int i = uuids.Count - 1; i >= 0; i--) 
      { 
       if (!listSeenUuids.Contains(uuids[i])) 
       { 
        Message unseenMessage = pop3Client.GetMessage(i + 1); 
        newMessages.Add(unseenMessage); 
        object[,] parArray = new object[,] { { "@seenUuid", uuids[i] } }; 
        DB.ExecuteNonQuery_SP("saveToSeenUuids", parArray); 
        uuidCounter++; 
       } 
       if (uuidCounter >= Convert.ToInt32(txtNoOfMails.Text)) 
        break; 
      } 
      int j = count; 
      foreach (Message message in newMessages) 
      { 
       Email email = new Email() 
       { 
        MessageNumber = j, 
        Subject = message.Headers.Subject, 
        DateSent = message.Headers.DateSent, 
        From = message.Headers.From.MailAddress.ToString(), 
       }; 
       MessagePart body = message.FindFirstPlainTextVersion(); 
       if (body != null) 
       { 
        email.Body = body.GetBodyAsText(); 
       } 
       List<MessagePart> attachments = message.FindAllAttachments(); 

       foreach (MessagePart attachment in attachments) 
       { 
        email.Attachments.Add(new Attachment 
        { 
         FileName = attachment.FileName, 
         ContentType = attachment.ContentType.MediaType, 
         Content = attachment.Body 
        }); 
       } 
       this.Emails.Add(email); 
       j--; 
      } 
      gvEmails.DataSource = this.Emails; 
      gvEmails.DataBind(); 
     } 
     protected void OnRowDataBound(object sender, GridViewRowEventArgs e) 
     { 
      if (e.Row.RowType == DataControlRowType.DataRow) 
      { 
       Repeater rptAttachments = (e.Row.FindControl("rptAttachments") as Repeater); 
       List<Attachment> attachments = this.Emails.Where(email => email.MessageNumber == Convert.ToInt32(gvEmails.DataKeys[e.Row.RowIndex].Value)).FirstOrDefault().Attachments; 
       rptAttachments.DataSource = attachments; 
       rptAttachments.DataBind(); 
      } 
     } 
     protected void SaveAll(object sender, EventArgs e) 
     { 
      Button btnSaveAll = (sender as Button); 
      GridViewRow row = (GridViewRow)btnSaveAll.NamingContainer; 
      int id = (int)gvEmails.DataKeys[row.RowIndex].Value; 
      List<Attachment> attachments = this.Emails.Where(email => email.MessageNumber == Convert.ToInt32(gvEmails.DataKeys[row.RowIndex].Value)).FirstOrDefault().Attachments; 
      foreach (Attachment attachment1 in attachments) 
      { 
       Attachment attachment = attachments.Where(a => a.FileName == attachment1.FileName).FirstOrDefault(); 
       Response.AddHeader("content-disposition", "attachment;filename=" + attachment.FileName); 
       Response.ContentType = attachment.ContentType; 
       Response.BinaryWrite(attachment.Content); 
       Response.End(); 
      } 
     } 
    } 

的問題是，它僅下載第一個附件。 當我再次嘗試保持Response.End()函數在foreach循環之外時，它說：「檢測到重複的頭文件」。 任何幫助，將不勝感激。

Answer 1

我發現this site帶有您的標誌的完整代碼回答