Outlook：未將對象引用設置爲對象的實例

Question

我有一個Outlook加載項（基本推送郵件到我們的應用程序），這是在一臺機器上返回問題（正常工作）。這只是沒有工作沒有錯誤，所以我們去了系統菜單，並將VSTO_SUPPRESSDISPLAYALERTS = 0推到屏幕。

當我然後跑了同步，我得到了以下

Object reference not set to an instance of an object. 


************** Exception Text ************** 
System.NullReferenceException: Object reference not set to an instance of an object. 
at MyAppOutlook.WaitingPopup.btnSyncOutlookInboxMail_Click(Object sender, EventArgs e) 
at System.Windows.Forms.Control.OnClick(EventArgs e) 
at System.Windows.Forms.Button.OnClick(EventArgs e) 
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) 
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) 
at System.Windows.Forms.Control.WndProc(Message& m) 
at System.Windows.Forms.ButtonBase.WndProc(Message& m) 
at System.Windows.Forms.Button.WndProc(Message& m) 
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) 
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) 
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam,  IntPtr lparam) 

我跟不上，爲什麼這適用於大多數機器，但沒有這一項。該插件安裝並出現在其他機器的工具欄上，但它不起作用！

我已經檢查並重新安裝以下之前，我安裝了我們的插件：

• .NET3.5框架
• 主Interop 2007

注：大會展望2007年是

按照要求，該過程的代碼如下

Outlook.MAPIFolder outlookSentFolder =  (Outlook.MAPIFolder)outlookObj.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail); 

for (int i = 1; i <= outlookSentFolder.Items.Count; i++) 
{ 
    Outlook.MailItem mm = outlookSentFolder.Items[i] as Outlook.MailItem; 
    if (mm != null) 
    { 
     try 
     { 
      DateTime StartDate = new DateTime(((Outlook.MailItem)outlookSentFolder.Items[i]).SentOn.Year, ((Outlook.MailItem)outlookSentFolder.Items[i]).SentOn.Month, ((Outlook.MailItem)outlookSentFolder.Items[i]).SentOn.Day, ((Outlook.MailItem)outlookSentFolder.Items[i]).SentOn.Hour, ((Outlook.MailItem)outlookSentFolder.Items[i]).SentOn.Minute, 0); 

      if (StartDate > currentDate) // condition for current month mail sync 
      { 
       string attachs = ""; 
       for (int j = 0; j < ((Outlook.MailItem)outlookSentFolder.Items[i]).Attachments.Count; j++) 
       { 
        attachs = ((Outlook.MailItem)outlookSentFolder.Items[i]).Attachments[j + 1].FileName.ToString() + "," + attachs; 
       } 

       ASCIIEncoding encoding = new ASCIIEncoding(); 
       string postData = "userDBName=" + subsDBName; 
       postData += ("|MethodRequestName=addUpdateInboxMailFromOutlookToCRM"); 
       postData += ("|loginid=" + username); 
       postData += ("|MailTo=" + ((Outlook.MailItem)outlookSentFolder.Items[i]).To); 
       postData += ("|MailCC=" + ((Outlook.MailItem)outlookSentFolder.Items[i]).CC); 
       postData += ("|MailFrom=" + ((Outlook.MailItem)outlookSentFolder.Items[i]).SenderEmailAddress); 
       postData += ("|MailSubject=" + ((((((Outlook.MailItem)outlookSentFolder.Items[i]).Subject).Replace("|", "")).Replace("#", "")).Replace("<", "")).Replace(">", "")); 
       postData += ("|MailBody=" + ((((((Outlook.MailItem)outlookSentFolder.Items[i]).Body).Replace("|", "")).Replace("#", "")).Replace("<", "")).Replace(">", "")); 
       postData += ("|MailSentOn=" + StartDate.ToString("MM/dd/yyyy hh:mm:ss"));//((Outlook.MailItem)outlookSentFolder.Items[i]).SentOn.ToString()); 
       postData += ("|MailType=Sent"); 
       postData += ("|MailAttach=" + attachs); 
       byte[] data = encoding.GetBytes(postData); 

       // Prepare web request... 
       HttpWebRequest myRequestSent = (HttpWebRequest)WebRequest.Create(reqURL + "Views/Subscription/OutlookDataService.aspx"); 
       myRequestSent.Method = "POST"; 
       myRequestSent.ContentType = "application/x-www-form-urlencoded"; 
       myRequestSent.ContentLength = data.Length; 
       Stream newStream = myRequestSent.GetRequestStream(); 
       // Send the data. 
       newStream.Write(data, 0, data.Length); 
       newStream.Close(); 

       WebResponse responseHtmlSent = myRequestSent.GetResponse(); 
       string xmlString = ""; 
       using (StreamReader r = new StreamReader(responseHtmlSent.GetResponseStream())) 
       { 
        xmlString = xmlString + r.ReadToEnd(); 
       } 
       responseHtmlSent.Close(); 
      } 
     } 
     catch (Exception ex) 
     { 
      System.Windows.Forms.MessageBox.Show("Warning: " + ex.Message.ToString(), "Warning"); 
     } 
    } 
} 

請誰能幫助，因爲我們設法讓儘可能得到這個錯誤？然而，我的理解是，這個錯誤通常意味着我們錯誤地引用了表，但是爲什麼它會在大多數其他機器上工作？

感謝

Answer 1

你有沒有加入try ... catch塊到你的代碼，而你一直在這個問題或者已經就一直存在？

如果它一直在那裏，你提到它只是沒有工作沒有錯誤那麼errro必須在此之外。我會檢查受影響的用戶是否確實有發送郵件文件夾。