学步园

      在SharePoint的项目中，经常会把SharePoint 和Exchange整合到一起，所以我们经常会遇到读取OWA中未读邮件的问题，当然解决的方法 也是多种多样的。有以下几种：

1.  WebDAV的方式

示例代码： 

 private int GetUnReadMailCount()<br /> {<br /> string url = "http://10.10.10.254/exchange/"; //指定Exchange服务器地址<br /> System.Net.HttpWebRequest Request;<br /> System.Net.WebResponse Response;<br /> System.Net.CredentialCache MyCredentialCache;<br /> string strUserName = UserName; //指定登录的用户名<br /> string strRootURI = url + strUserName; //得到要访问邮箱的WebDAV地址<br /> string strPassword = PassWord; //指定该用户的密码<br /> string strDomain = "unique.com"; //指定域名<br /> string strQuery = "";<br /> byte[] bytes = null;<br /> System.IO.Stream RequestStream = null;<br /> System.IO.Stream ResponseStream = null;<br /> XmlDocument ResponseXmlDoc = null;<br /> XmlNodeList HrefNodes = null;<br /> XmlNodeList SizeNodes = null;<br /> int count = 0;<br /> try<br /> {<br /> // 用SQL查询WebDAV返回结果中的unreadcount节点.<br /> strQuery = "<?xml version=/"1.0/"?><D:searchrequest xmlns:D = /"DAV:/" >"<br /> + "<D:sql>SELECT /"DAV:displayname/",/"urn:schemas:httpmail:unreadcount/" FROM /"" + strRootURI + "/""<br /> + "</D:sql></D:searchrequest>";<br /> // 创建新的CredentialCache对象，构建身份凭据<br /> MyCredentialCache = new System.Net.CredentialCache();<br /> MyCredentialCache.Add(new System.Uri(strRootURI), "NTLM",<br /> new System.Net.NetworkCredential(strUserName, strPassword, strDomain));<br /> // Create the HttpWebRequest object.<br /> Request = (System.Net.HttpWebRequest)HttpWebRequest.Create(strRootURI);<br /> // 指定HttpWebRequest的身份凭据，此处为关键所在。如果使用之前<br /> // 创建的MyCredentialCache，则这个身份凭据是可以从Web服务器传递<br /> // 到Exchange服务器的，但是这样带来的问题也很明显，就是不能够自<br /> // 动获取当前登录到域的用户的身份。即便已经成功登录到域，那也只<br /> // 能通过form再次输入用户名密码。因此，我在这里用的是<br /> // Request.Credentials = CredentialCache.DefaultCredentials，<br /> // 这样便可以获得当前用户的凭据，但是这样带来的问题便是上面提到的<br /> // 身份凭据无法传递的问题，解决方法请关注下篇文章。<br /> Request.Credentials = MyCredentialCache;<br /> // 指定WebDAV的SEARCH方法<br /> Request.Method = "SEARCH";<br /> // Encode the body using UTF-8.<br /> bytes = Encoding.UTF8.GetBytes((string)strQuery);<br /> // Set the content header length. This must be<br /> // done before writing data to the request stream.<br /> Request.ContentLength = bytes.Length;<br /> // Get a reference to the request stream.<br /> RequestStream = Request.GetRequestStream();<br /> // Write the SQL query to the request stream.<br /> RequestStream.Write(bytes, 0, bytes.Length);<br /> // Close the Stream object to release the connection<br /> // for further use.<br /> RequestStream.Close();<br /> // Set the content type header.<br /> Request.ContentType = "text/xml";<br /> // Send the SEARCH method request and get the<br /> // response from the server.<br /> Response = (HttpWebResponse)Request.GetResponse();<br /> // Get the XML response stream.<br /> ResponseStream = Response.GetResponseStream();<br /> // 创建XmlDocument对象，并获取收件箱的unreadcount节点的值<br /> ResponseXmlDoc = new XmlDocument();<br /> ResponseXmlDoc.Load(ResponseStream);<br /> HrefNodes = ResponseXmlDoc.GetElementsByTagName("a:displayname");<br /> SizeNodes = ResponseXmlDoc.GetElementsByTagName("d:unreadcount");<br /> for (int i = 0; i < HrefNodes.Count; i++)<br /> {<br /> if (HrefNodes[i].InnerText == "收件箱")<br /> count = int.Parse(SizeNodes[i].InnerText);<br /> }<br /> ResponseStream.Close();<br /> Response.Close();<br /> }<br /> catch (Exception ex)<br /> {<br /> // Catch any exceptions. Any error codes from the SEARCH<br /> // method request on the server will be caught here, also.<br /> return -1;<br /> }<br /> return count;<br /> } 

 缺点主要在用户的凭证上面。

a.   通过用户的用户名和密码进行身份的认证。可以通过SharePoint的SSO存储用户的凭证信息

b.   加域的机器通过默认的身份凭证信息进行身份认证。这里面会有一个认证的设置。因为SharePoint中默认的认证方式是NTLM，认证的时候，需要使用用户名和密码，而Kerberos认证是通过票据进行认证的。所以我们要把相应的认证方式进行设置。

2.   通过Exchange Web Services方式

      通过Exchange Web Services 访问的方式也有2中得到未读邮件的方式：

a.   通过用户的用户名和密码进行认证，查询自己的未读邮件

示例代码：

protected int GetUnreadMailCount1()<br /> {<br /> int count = 0;<br /> try<br /> {<br /> string url = System.Configuration.ConfigurationSettings.AppSettings["SMTPServer"];<br /> if (!url.EndsWith("/"))<br /> {<br /> url += "/";<br /> }<br /> url += "EWS/Exchange.asmx";<br /> url = "https://" + url;<br /> // 绑定exchange服务器<br /> ExchangeServiceBinding exchangeServer = new ExchangeServiceBinding();<br /> // 建立信任连接<br /> exchangeServer.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;<br /> exchangeServer.Url = url;<br /> // 定义邮件的收件箱<br /> DistinguishedFolderIdType[] folderIDArray = new DistinguishedFolderIdType[1];<br /> folderIDArray[0] = new DistinguishedFolderIdType();<br /> folderIDArray[0].Id = DistinguishedFolderIdNameType.inbox;<br /> PathToUnindexedFieldType ptuftDisplayName = new PathToUnindexedFieldType();<br /> ptuftDisplayName.FieldURI = UnindexedFieldURIType.folderDisplayName;<br /> PathToExtendedFieldType pteftComment = new PathToExtendedFieldType();<br /> pteftComment.PropertyTag = "0x3004"; // PR_COMMENT<br /> pteftComment.PropertyType = MapiPropertyTypeType.String;<br /> // 定义GetFolderType对象，设置相应属性<br /> GetFolderType myfoldertype = new GetFolderType();<br /> myfoldertype.FolderIds = folderIDArray;<br /> myfoldertype.FolderShape = new FolderResponseShapeType();<br /> myfoldertype.FolderShape.BaseShape = DefaultShapeNamesType.IdOnly;<br /> myfoldertype.FolderShape.AdditionalProperties = new BasePathToElementType[2];<br /> myfoldertype.FolderShape.AdditionalProperties[0] = ptuftDisplayName;<br /> myfoldertype.FolderShape.AdditionalProperties[1] = pteftComment;<br /> // 获取服务器中的文件夹的集合<br /> GetFolderResponseType myFolder = exchangeServer.GetFolder(myfoldertype);<br /> // 获取收件箱<br /> FolderInfoResponseMessageType firmtInbox =<br /> (FolderInfoResponseMessageType)myFolder.ResponseMessages.Items[0];<br /> PathToUnindexedFieldType ptuftSubject = new PathToUnindexedFieldType();<br /> ptuftSubject.FieldURI = UnindexedFieldURIType.itemSubject;<br /> PathToUnindexedFieldType ptuftBody = new PathToUnindexedFieldType();<br /> ptuftBody.FieldURI = UnindexedFieldURIType.itemAttachments;<br /> PathToExtendedFieldType pteftFlagStatus = new PathToExtendedFieldType();<br /> pteftFlagStatus.PropertyTag = "0x1090"; // PR_FLAG_STATUS<br /> pteftFlagStatus.PropertyType = MapiPropertyTypeType.Integer;<br /> // 定义FindItemType对象，准备获取收件箱中的集合<br /> FindItemType findItemRequest = new FindItemType();<br /> findItemRequest.Traversal = ItemQueryTraversalType.Shallow;<br /> findItemRequest.ItemShape = new ItemResponseShapeType();<br /> findItemRequest.ItemShape.BaseShape = DefaultShapeNamesType.AllProperties;<br /> findItemRequest.ParentFolderIds = new FolderIdType[1];<br /> findItemRequest.ParentFolderIds[0] = firmtInbox.Folders[0].FolderId;<br /> // 获取邮件<br /> FindItemResponseType firt = exchangeServer.FindItem(findItemRequest);<br /> // 循环迭代每一封邮件<br /> foreach (FindItemResponseMessageType firmtMessage in firt.ResponseMessages.Items)<br /> {<br /> // 如果包含邮件，显示出来<br /> if (firmtMessage.RootFolder.TotalItemsInView > 0)<br /> {<br /> // 循环迭代每一封邮件详细信息<br /> foreach (ItemType it in ((ArrayOfRealItemsType)firmtMessage.RootFolder.Item).Items)<br /> {<br /> if (!((MessageType)(it)).IsRead)<br /> {<br /> count++;<br /> }<br /> }<br /> }<br /> }<br /> }<br /> catch (Exception ex)<br /> {<br /> //TODO<br /> }<br /> return count;<br /> }<br />   

b.  通过身份模拟的方式进行，这个好像只有Exchange 2007 中才有

示例代码：

可以不用域环境就能访问用户的未读邮件

缺点：

直接使用代码是没有用的，会提示相应的错误信息：

The server to which the
application is connected cannot impersonate the requested user due to
insufficient permission.

必须在Exchange上的控制台上面使用以下的命令，才能正常的使用：

foreach ($exchangeServer in
Get-ExchangeServer)
{
     if
($exchangeServer.ServerRole -match 'ClientAccess')
     {
         
Add-ADPermission -Identity $exchangeServer.DistinguishedName -User 'domain"user'
-ExtendedRights ms-Exch-EPI-Impersonation
     }

}