ExchangeService（EWS)錯誤：The response received from the service didn’t contain valid XML.

在用ExchangeService（EWS)串連Exchange郵件伺服器時，報錯：

        The response received from the service didn't contain valid XML.其InnerException為：        The expected XML node type was XmlDeclaration, but the actual type is Element.其原始碼如下：   

 //串連伺服器            ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);            service.Credentials = new NetworkCredential("***", "***", "***");            service.AutodiscoverUrl("***");               //擷取郵件清單（收件匣中的郵件)            FindItemsResults<Item> findResults = service.FindItems(WellKnownFolderName.Inbox,new ItemView(10));                     foreach (Item item in findResults.Items)            {                               //擷取具體的郵件對象                EmailMessage email = EmailMessage.Bind(service, item.Id);                //判斷附件是否為檔案                 if (!(email.Attachments[0] is FileAttachment)) continue;                FileAttachment fileAttachment = email.Attachments[0] as FileAttachment;                fileAttachment.Load("C:\\temp\\" + fileAttachment.Name);                //標示讀取                   email.IsRead = true;                //將對郵件的改動提交到伺服器                   email.Update(ConflictResolutionMode.AlwaysOverwrite);            }

查了一些資料，也沒有找到具體的原因，自己嘗試了好多方法，最終將代碼更改如下：       

 //串連伺服器            ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);            service.Credentials = new NetworkCredential("使用者名稱", "密碼", "域");            service.AutodiscoverUrl("你的郵箱");            service.Url = new Uri("這裡是你的郵箱Service地址（以asmx結尾）");               //擷取郵件清單（收件匣中的郵件)            FindItemsResults<Item> findResults = service.FindItems(WellKnownFolderName.Inbox,new ItemView(10));                     foreach (Item item in findResults.Items)            {                               //擷取具體的郵件對象                EmailMessage email = EmailMessage.Bind(service, item.Id);                //判斷附件是否為檔案                 if (!(email.Attachments[0] is FileAttachment)) continue;                FileAttachment fileAttachment = email.Attachments[0] as FileAttachment;                fileAttachment.Load("C:\\temp\\" + fileAttachment.Name);                //標示讀取                   email.IsRead = true;                //將對郵件的改動提交到伺服器                   email.Update(ConflictResolutionMode.AlwaysOverwrite);            }

這一次就能正常收取了，加入了URL問題就解決了，不知道這個是什麼原因，我原來用第一段代碼的時候，並沒有加入Url也能夠正常訪問的，這個事情比較的奇怪。