EWS编程问题二：如何利用EWS读取Exchange里面相应用户的未读邮件数量（解决）

        最近几个项目都碰到如何读取Exchange中，登录域用户的未读邮件数量问题，查了一些文章这个问题终于解决掉。现在将源代码放在这里。首先新建一个项目，控制台应用程序，WinForm或者WebPart，网站都可以。然后我们添加Exchange的WebService引用，这里可以完成很多对Exchange邮箱的操作，可以分别读取相应文件夹里面的东西，甚至是邮件的内容等等，当然，这肯定是需要用户的用户名和密码才能完成，不然这个Exchange就不安全了，O(∩_∩)O~

        在添加Exchange的WebService时有个需要注意的问题，不然你是不能找到ExchangeServiceBinding这个类的。请参考这篇文章。剩下的代码如下：

        调用部分的代码：

代码 ServicePointManager.ServerCertificateValidationCallback = delegate(Object obj, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; }; 

ExchangeServiceBinding service = new ExchangeServiceBinding ();

service.RequestServerVersionValue = new RequestServerVersion(); 
service.RequestServerVersionValue.Version = ExchangeVersionType.Exchange2010; 
service.EnableDecompression = true; 
service.Credentials = new NetworkCredential("username", "password", "domain"); 
service.Url = @https://192.168.100.11/EWS/exchange.asmx;

int merCurrentCount = GetUnreadFolderItemsCount(service, "Inbox");

       涉及到的两个方法：

代码 public int GetUnreadFolderItemsCount(ExchangeServiceBinding service, string folderName) 
       { 
           int unReadCount = -1; 
           // Identify the folder properties to return. 
           FolderResponseShapeType properties = new FolderResponseShapeType(); 
           PathToUnindexedFieldType ptuft = new PathToUnindexedFieldType(); 
           ptuft.FieldURI = UnindexedFieldURIType.folderManagedFolderInformation; 
           PathToUnindexedFieldType[] ptufts = new PathToUnindexedFieldType[1] { ptuft }; 
           properties.AdditionalProperties = ptufts; 
           properties.BaseShape = DefaultShapeNamesType.AllProperties; 

           // Form the get folder request. 
           BaseFolderIdType p_folder = FindFolderID(service, folderName); 

           GetFolderType request = new GetFolderType(); 
           request.FolderIds = new BaseFolderIdType[1] { p_folder }; 
           request.FolderShape = properties; 

           // Send the request and get the response. 
           GetFolderResponseType response = service.GetFolder(request); 

           ArrayOfResponseMessagesType aormt = response.ResponseMessages; 
           ResponseMessageType[] rmta = aormt.Items; 
           foreach (ResponseMessageType rmt in rmta) 
           { 
               if (rmt.ResponseClass == ResponseClassType.Error) 
               { 
                   throw new Exception(rmt.MessageText); 
               } 
               else 
               { 
                   FolderInfoResponseMessageType firmt; 
                   firmt = (rmt as FolderInfoResponseMessageType); 
                   BaseFolderType[] folders = firmt.Folders; 

                   foreach (BaseFolderType rfolder in folders) 
                   { 
                       if (rfolder is FolderType) 
                       { 
                           FolderType myFolder; 
                           myFolder = (rfolder as FolderType); 
                           if (myFolder.UnreadCountSpecified) 
                           { 
                               unReadCount = myFolder.UnreadCount; 
                           } 
                       } 
                   } 
               } 
           } 
           return unReadCount; 
       } 

       public static FolderIdType FindFolderID(ExchangeServiceBinding service, String folderName) 
       { 
           DistinguishedFolderIdType objSearchRootFolder = new DistinguishedFolderIdType(); 
           objSearchRootFolder.Id = DistinguishedFolderIdNameType.msgfolderroot; 

           FindFolderType requestFindFolder = new FindFolderType(); 
           requestFindFolder.Traversal = FolderQueryTraversalType.Deep; 
           requestFindFolder.ParentFolderIds = new DistinguishedFolderIdType[] { objSearchRootFolder }; 
           requestFindFolder.FolderShape = new FolderResponseShapeType(); 
           requestFindFolder.FolderShape.BaseShape = DefaultShapeNamesType.IdOnly; 

           //Search filter definition 
           requestFindFolder.Restriction = new RestrictionType(); 

           #region Contains expression 

           ContainsExpressionType objContainsExpression = new ContainsExpressionType(); 
           objContainsExpression.ContainmentMode = ContainmentModeType.FullString; 
           objContainsExpression.ContainmentModeSpecified = true; 
           objContainsExpression.ContainmentComparison = ContainmentComparisonType.Exact; 
           objContainsExpression.ContainmentComparisonSpecified = true; 

           PathToUnindexedFieldType objFieldFolderName = new PathToUnindexedFieldType(); 
           objFieldFolderName.FieldURI = UnindexedFieldURIType.folderDisplayName; 
           objContainsExpression.Item = objFieldFolderName; 

           objContainsExpression.Constant = new ConstantValueType(); 
           objContainsExpression.Constant.Value = folderName; 

           #endregion Contains expression 

           requestFindFolder.Restriction.Item = objContainsExpression; 

           FindFolderResponseType objFindFolderResponse = 
               service.FindFolder(requestFindFolder); 

           if (objFindFolderResponse.ResponseMessages.Items.Length == 0) 
               return null; 

           foreach (ResponseMessageType responseMsg in 
               objFindFolderResponse.ResponseMessages.Items) 
           { 
               if (responseMsg.ResponseClass == ResponseClassType.Success) 
               { 
                   FindFolderResponseMessageType objFindResponse = 
                       responseMsg as FindFolderResponseMessageType; 
                   foreach ( 
                       BaseFolderType objFolderType in objFindResponse.RootFolder.Folders) 
                   { 
                       return objFolderType.FolderId; 
                   } 
               } 
           } 
           return null; 
       }

       参考文章：Get the Unread count of the Inbox of Exchange 2010/2007, using web services