一种读取Exchange的用户未读邮件数方法！

已好几个月没写博客了，由于之前忙于开发基于Sharepoint上的移动OA（AgilePoint）和采用混合移动开发技术开发一个安卓版的企业通讯录APP（数据与lync一致），并于1月初正式上线。马年初二的时候，有个天津的网友加我QQ，说我之前发表博客SharePoint 2013中修改windows 活动目录(AD)域用户密码的WebPart（免费下载），的确对他有帮助，要捐助78元给我，希望我多发表相关的经验总结分享，本人深受鼓舞，并把修改AD域用户密码发他参考学习研究，并在初五合作了另外的Sharepoint 2013开发需求，并通过淘宝支付了定金，能够帮助他人解决问题，得到他人的认可还是蛮开心的。

今天分享一下在1月初完成的KMS与OA的门户整合中其中用到的一种读取Exchange的用户未读邮件数方法，由于KMS是基于java开发的，并且通过Cas已实现了SSO，需要通过接口把当前登录用户的未读取邮件数显示在KMS中，点击直接进入到OWA页面，如下图：

本文主要通过采用EWS API方式自定义开发一个Web服务，并授权一个账户有模拟其他用户的权限，具体如下：

1.安装Microsoft Exchange Web Services Managed API 2.0，下载地址如下：

http://www.microsoft.com/en-us/download/details.aspx?id=35371

2.0版本支持Exchange Server 2007 Service Pack 1以上，即包括Exchange Server 2010 Service和 Exchange Server 2013 Service。

2.在Exchange服务器中授权一个账户有模拟其他用户的权限，具体如下：

以Exchange 2010 Server为例，比如授权spadmin账号模拟其他用户的权限，打开Exchange 2010服务器在命令行中输入：

New-ManagementRoleAssignment -Name:impersonationAssignmentName -Role:applicationImpersonation -User:spadmin

3.利用EWS API开发一个自定义的读取Exchange的用户未读邮件数Web服务，已供其他系统（如KMS）调用，完整的C#代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Services;using System.Web.Services.PRotocols;using System.Web.Services.Description;using System.Net;using System.Net.Security;using System.Security.Cryptography.X509Certificates;using ExchangeWebService.ews;namespace ExchangeWebService{    /// <summary>    /// Exchange Web Service by 软件人生 2013.12.31    /// </summary>    [WebService(Namespace = "http://www.cnblogs.com/nbpowerboy/exchange/")]    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]    [System.ComponentModel.ToolboxItem(false)]    // 若要允许使用 asp.net Ajax 从脚本中调用此 Web 服务，请取消对下行的注释。    [System.Web.Script.Services.ScriptService]    public class ExchangeWebService : System.Web.Services.WebService    {        /// <summary>        /// 返回默认登录域用户的未读邮件数        /// </summary>        /// <returns>返回默认登录域用户的未读邮件数</returns>        [SoapRpcMethod(Action = "http://www.cnblogs.com/nbpowerboy/exchange/GetUserUnReadMailCount", RequestNamespace = "http://www.cnblogs.com/nbpowerboy/exchange/", ResponseNamespace = "http://www.cnblogs.com/nbpowerboy/exchange/", Use = SoapBindingUse.Literal)]        [WebMethod]        public int GetUserUnReadMailCount(string username, string passWord, string domain)        {                        int merCurrentCount = 0;            try            {                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_SP2;                service.EnableDecompression = true;                System.Net.NetworkCredential nc = new NetworkCredential(username,password,domain);                //ICredentials creds = System.Net.CredentialCache.DefaultNetworkCredentials;                service.Credentials = nc;                              service.Url = @"https://mailserver/EWS/exchange.asmx";                merCurrentCount = GetUnreadFolderItemsCount(service, "收件箱");            }            catch            {            }            return merCurrentCount;        }        /// <summary>        /// 根据用户邮件地址返回用户的未读邮件数        /// </summary>        /// <returns>根据用户邮件地址返回用户的未读邮件数</returns>        [SoapRpcMethod(Action = "http://www.cnblogs.com/nbpowerboy/exchange/GetUnReadMailCountByUserMailAddress", RequestNamespace = "http://www.cnblogs.com/nbpowerboy/exchange/", ResponseNamespace = "http://www.cnblogs.com/nbpowerboy/exchange/", Use = SoapBindingUse.Literal)]        [WebMethod]        public int GetUnReadMailCountByUserMailAddress(string UserMailAddress)        {            int unRead = 0;            try            {                Microsoft.Exchange.WebServices.Data.ExchangeService service = new Microsoft.Exchange.WebServices.Data.ExchangeService(Microsoft.Exchange.WebServices.Data.ExchangeVersion.Exchange2010_SP2);                service.Credentials = new NetworkCredential("spadmin", "Password", "contoso");                service.Url = new Uri(@"https://mailserver/EWS/exchange.asmx");                service.ImpersonatedUserId = new Microsoft.Exchange.WebServices.Data.ImpersonatedUserId(Microsoft.Exchange.WebServices.Data.ConnectingIdType.SmtpAddress, UserMailAddress);                unRead = Microsoft.Exchange.WebServices.Data.Folder.Bind(service, Microsoft.Exchange.WebServices.Data.WellKnownFolderName.Inbox).UnreadCount;            }            catch            {            }            return unRead;        }        /// <summary>        /// 根据用户名返回用户的未读邮件数        /// </summary>        /// <returns>根据用户邮件地址返回用户的未读邮件数</returns>        [SoapRpcMethod(Action = "http://www.cnblogs.com/nbpowerboy/exchange/GetUnReadMailCountByUserPrincipalName", RequestNamespace = "http://www.cnblogs.com/nbpowerboy/exchange/", ResponseNamespace = "http://www.cnblogs.com/nbpowerboy/exchange/", Use = SoapBindingUse.Literal)]        [WebMethod]        public int GetUnReadMailCountByUserPrincipalName(string UserPrincipalName)        {            int unRead = 0;            try            {                Microsoft.Exchange.WebServices.Data.ExchangeService service = new Microsoft.Exchange.WebServices.Data.ExchangeService(Microsoft.Exchange.WebServices.Data.ExchangeVersion.Exchange2010_SP2);                service.Credentials = new NetworkCredential("spadmin", "Password", "contoso");                service.Url = new Uri(@"https://mailserver/EWS/exchange.asmx");                service.ImpersonatedUserId = new Microsoft.Exchange.WebServices.Data.ImpersonatedUserId(Microsoft.Exchange.WebServices.Data.ConnectingIdType.PrincipalName, UserPrincipalName);                unRead = Microsoft.Exchange.WebServices.Data.Folder.Bind(service, Microsoft.Exchange.WebServices.Data.WellKnownFolderName.Inbox).UnreadCount;            }            catch            {            }            return unRead;        }        private static int GetUnreadFolderItemsCount(ExchangeServiceBinding service, string folderName)        {            try            {                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);                        BaseFolde