通过Exchange Web Service Managed API 读取Exchange邮件或任务

Exchange Web Service Managed API:是微软提供的通过Exchange Web Service开发客户端应用程序来快速读取Exchange邮件、任务、发送邮件、删除邮件等的管理接口。

使用API的好处：

1、不用需要引用Exchange Web Service

2、代码量大大减少，提高开发效率

3、提高性能且更简单容易的对Exchange进行管理和操作

下载地址：http://www.microsoft.com/downloads/en/details.aspx?FamilyID=c3342fb3-fbcc-4127-becf-872c746840e1

通过API来读取Exchange的邮件或任务的实现过程，如下：

1、引用如下命名空间：

using Microsoft.Exchange.WebServices.Data;
using System.Net;
using System.Net.Security;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;

2、实现代码

        /// <summary>
        /// 读取所有Exchange对象数目，不使用模拟功能
        /// </summary>
        /// <param name="serverName">服务器名称</param>
        /// <param name="useAutodiscover">是否自动发现服务器URL</param>
        public void EWSImpersonations(string serverName, bool useAutodiscover)
        {
            try
            {
                //Call SSL Web service must added!!!
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);

                ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);//如果是Exchange 2010，则切换到2010
            //建立信任连接
                //ICredentials creds = CredentialCache.DefaultNetworkCredentials;
                    ICredentials creds = new NetworkCredential("username", "password", "domain");
                service.Credentials = new WebCredentials(creds);

                if (!useAutodiscover)
                {
                    string[] servers = serverName.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

                    for (int i = 0; i < servers.Length; i++)
                    {
                        try
                        {
                            service.Url = new Uri("https://" + servers[i] + "/ews/exchange.asmx");
                            break;
                        }
                        catch
                        {
                        }
                    }
                }

                service.PreAuthenticate = true;
            
            //创建读取信息视图
                ItemView view = new ItemView(10);
                view.OrderBy.Add(ItemSchema.DateTimeReceived, Microsoft.Exchange.WebServices.Data.SortDirection.Descending);

                #region ReadEmail

                Folder inbox = Folder.Bind(service, WellKnownFolderName.Inbox);//Inbox文件夹，不包括子文件夹
                int unread = inbox.UnreadCount;

                Microsoft.Exchange.WebServices.Data.EmailMessage em = null;

                FindItemsResults<Item> findMailResults = service.FindItems(WellKnownFolderName.Inbox, view);
                Response.Write("<br>unread mail subject: <br><br>");

                foreach (Item m in findMailResults)
                {
                    em = (Microsoft.Exchange.WebServices.Data.EmailMessage)m;
                    if (!em.IsRead)
                    {
                        Response.Write(em.Subject + string.Format("  发件人: {0} <br>", em.From.Name.ToString()));
                    }
                }

                //find all child folders mail message
                FindInboxChildFolders(service, view, serverName, ref unread);

                Response.Write("unread mail : " + unread.ToString() + "<br>");

                #endregion

                Response.Write("==================================================");

                #region ReadTask

                int newTasks = 0;//unread task number
                FindItemsResults<Item> findResults = service.FindItems(WellKnownFolderName.Tasks,view); //读取任务文件夹，不包括子文件夹
                Microsoft.Exchange.WebServices.Data.Task t = null;

                Response.Write("<br>unread task subject:<br>");

                foreach (Item item in findResults.Items)
                {
                    t = (Microsoft.Exchange.WebServices.Data.Task)(item);
                    if (!t.IsComplete)
                    {
                        newTasks++;

                        Response.Write(t.Subject);

                        Response.Write("<br>status :" + t.Status);
                    }
                }

                //Find all task child folder
                FindTaskChildFolders(service, view, serverName, ref newTasks);

                Response.Write("<br><br> unread task :" + newTasks.ToString());

                #endregion
            }
            catch (Exception ex)
            {
                Response.Write(errorMessage);
            }
        }

        /// <summary>
        /// Find all child folder mail message
        /// </summary>
        /// <param name="service"></param>
        /// <param name="view"></param>
        /// <param name="serverName"></param>
        /// <param name="unread"></param>
        private void FindInboxChildFolders(ExchangeService service, ItemView view, string serverName, ref int unread)
        {
            try
            {
                FindFoldersResults findResults = service.FindFolders(WellKnownFolderName.Inbox,new FolderView(int.MaxValue));
                Microsoft.Exchange.WebServices.Data.EmailMessage em = null;
                foreach (Folder folder in findResults.Folders)
                {
                    FindItemsResults<Item> findMailResults = folder.FindItems(view);
                    unread += folder.UnreadCount;
                    foreach (Item m in findMailResults)
                    {
                        em = (Microsoft.Exchange.WebServices.Data.EmailMessage)m;
                        if (!em.IsRead)
                        {
                            Response.Write(em.Subject + string.Format("  发件人: {0} <br>", em.From.Name.ToString()));
                        }
                    }
                }
            }
            catch
            {
            }

        }

        /// <summary>
        /// Find all task child folder
        /// </summary>
        /// <param name="service"></param>
        /// <param name="view"></param>
        /// <param name="serverName"></param>
        /// <param name="newTasks"></param>
        private void FindTaskChildFolders(ExchangeService service, ItemView view, string serverName, ref int newTasks)
        {
            try
            {
                FindFoldersResults findResults = service.FindFolders(WellKnownFolderName.Tasks,new FolderView(int.MaxValue));

                Microsoft.Exchange.WebServices.Data.Task t = null;

                foreach (Folder folder in findResults.Folders)
                {
                    FindItemsResults<Item> findTaskResults = folder.FindItems(view);
                    foreach (Item task in findTaskResults)
                    {
                        t = (Microsoft.Exchange.WebServices.Data.Task)(task);
                        if (!t.IsComplete)
                        {
                            newTasks++;

                            Response.Write( t.Subject );

                            Response.Write("<br>status :" + t.Status);
                        }
                    }
                }
            }
            catch (Exception)
            {
            }
        }

        #endregion

        /// <summary>
        /// 忽略SSL证书请求
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="certificate"></param>
        /// <param name="chain"></param>
        /// <param name="errors"></param>
        /// <returns></returns>
        public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true;
        }

3、编译运行程序，读取邮件或任务