通过WebDav方法读取EXCHANGE邮件的方法

 可以通过WEBDAV的方法读取EXCHANGE的邮件信息，在E8.Net工作流架构的应用程序中有过这样开发案例，因为客户可能一开始不习惯用OUTLOOK等工具去阅读邮件，所以通过。NET程序读取exchange中的邮件信息，展示在用户的首页上。

  代码如下:

/// <summary>/// 取得未读邮件信息/// </summary>/// <returns></returns>        private string GetUnReadMailList(string strUserID, string strPassword)...{string url = System.Configuration.ConfigurationManager.AppSettings["ExchangeServer"];System.Net.HttpWebRequest Request;System.Net.WebResponse Response;System.Net.CredentialCache MyCredentialCache;string strRootURI = url + "/" + strUserID + "/收件箱";string strUserName = strUserID;//string strDomain = ConfigurationSettings.AppSettings["ExchangeDomain"];            string strDomain = System.Configuration.ConfigurationManager.AppSettings["Domain"];string strQuery = "";byte[] bytes = null;System.IO.Stream RequestStream = null;System.IO.Stream ResponseStream = null;XmlDocument ResponseXmlDoc = null;Epower.DevBase.Organization.SqlDAL.UserEntity user = new Epower.DevBase.Organization.SqlDAL.UserEntity(strUserID);string strEmailXml = "";try...{strQuery = "<?xml version="1.0"?><D:searchrequest xmlns:D = "DAV:" >"+ "<D:sql>SELECT "DAV:displayname","urn:schemas:mailheader:subject","//  + ""urn:schemas:mailheader:approved ","//   + ""urn:schemas:mailheader:comment ","                          + ""urn:schemas:mailheader:from","+ ""urn:schemas:mailheader:date" FROM "" + strRootURI + """+ "where "urn:schemas:httpmail:read"=false"//    + "WHERE "DAV:ishidden" = false AND "DAV:isfolder" = false"                 + "</D:sql></D:searchrequest>";//集成验证方式下代码                Request = (System.Net.HttpWebRequest)HttpWebRequest.Create(strRootURI);Request.Timeout = 300000;   //超时 5分钟                MyCredentialCache = new System.Net.CredentialCache();MyCredentialCache.Add(new System.Uri(strRootURI),"NTLM",new System.Net.NetworkCredential(strUserName, user.Password, strDomain)//                 );//NTLM集成windows验证  Basic 基本验证                Request.Credentials = MyCredentialCache;//Request.Credentials = CredentialCache.DefaultNetworkCredentials;// Specify the method.                Request.Method = "SEARCH";// Encode the body using UTF-8.                bytes = Encoding.UTF8.GetBytes((string)strQuery);// Set the content header length..  This must be// done before writing data to the request stream.                Request.ContentLength = bytes.Length;// Get a reference to the request stream.                RequestStream = Request.GetRequestStream();// Write the SQL query to the request stream.                RequestStream.Write(bytes, 0, bytes.Length);// Close the Stream object to release the connection// for further use.                RequestStream.Close();// Set the content type header.                Request.ContentType = "text/xml;charset="utf-8"";// Send the SEARCH method request and get the// response from the server.                Response = (HttpWebResponse)Request.GetResponse();// Get the XML response stream.                ResponseStream = Response.GetResponseStream();// Create the XmlDocument object from the XML response stream.                ResponseXmlDoc = new XmlDocument();ResponseXmlDoc.Load(ResponseStream);strEmailXml = ResponseXmlDoc.InnerXml;ResponseStream.Close();Response.Close();}catch (Exception e)...{// Catch any exceptions. Any error codes from the SEARCH// method request on the server will be caught here, also.                return "";}return strEmailXml;}