——Hello,获取未读邮件数!
但凡学习一种新的编程语言,书中的第一个范例都是经典的“Hello,World”。初次尝试使用WebDAV,也得找一个基本的例子试试,以对其有一个感性的认识,我的例子是用来获取未读邮件数目的,所以就有了如上的小标题。
首先在SDK中搜索WebDAV,找到一些范例,看了看,有一个Getting a List of Folders (WebDAV) ,和所要实现的功能有点贴近。不管三七二十一。运行一下代码吧:
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using System;
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using System.Net;
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using System.IO;
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using System.Text;
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using System.Xml;
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namespace ExchangeSDK.Snippets.CSharp
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{
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class GettingListOfFoldersWebDAV
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{
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[STAThread]
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static void Main(string[] args)
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{
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// Variables.
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System.Net.HttpWebRequest Request;
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System.Net.WebResponse Response;
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System.Net.CredentialCache MyCredentialCache;
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string strRootURI = "http://server/TestStore/TestStoreFolder/";
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string strUserName = "UserName";
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string strPassword = "!Password";
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string strDomain = "Domain";
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string strQuery ="";
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byte[] bytes = null;
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System.IO.Stream RequestStream = null;
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System.IO.Stream ResponseStream = null;
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System.Xml.XmlTextReader XmlReader = null;
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try
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{
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// Build the SQL query.
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strQuery = "<?xml version=\"1.0\"?><D:searchrequest xmlns:D = \"DAV:\" >";
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strQuery += "<D:sql>SELECT \"DAV:href\" FROM scope('hierarchical traversal of \"";
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strQuery += strRootURI + "\"')</D:sql></D:searchrequest>";
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// Create a new CredentialCache object and fill it with the network
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// credentials required to access the server.
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MyCredentialCache = new System.Net.CredentialCache();
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MyCredentialCache.Add( new System.Uri(strRootURI),
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"NTLM",
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new System.Net.NetworkCredential(strUserName, strPassword, strDomain)
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);
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// Create the HttpWebRequest object.
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Request = (System.Net.HttpWebRequest)HttpWebRequest.Create(strRootURI);
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// Add the network credentials to the request.
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Request.Credentials = MyCredentialCache;
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// Specify the method.
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Request.Method = "SEARCH";
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// Encode the body using UTF-8.
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bytes = Encoding.UTF8.GetBytes((string)strQuery);
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// Set the content header length. This must be
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// done before writing data to the request stream.
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Request.ContentLength = bytes.Length;
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// Get a reference to the request stream.
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RequestStream = Request.GetRequestStream();
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// Write the SQL query to the request stream.
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RequestStream.Write(bytes, 0, bytes.Length);
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// Close the Stream object to release the connection
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// for further use.
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RequestStream.Close();
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// Set the content type header.
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Request.ContentType = "text/xml";
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// Send the SEARCH method request and get the
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// response from the server.
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Response = (HttpWebResponse)Request.GetResponse();
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// Get the XML response stream.
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ResponseStream = Response.GetResponseStream();
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// Create the XmlTextReader object from the XML
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// response stream.
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XmlReader = new XmlTextReader(ResponseStream);
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// Read through the XML response, node by node.
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while(XmlReader.Read())
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{
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// Look for the opening DAV:href node. The DAV: namespace is
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//typically assigned the a: prefix in the XML response body.
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if(XmlReader.Name == "a:href")
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{
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// Advance the reader to the text node.
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XmlReader.Read();
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// Display the value of the DAV:href text node.
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Console.WriteLine("Value: " + XmlReader.Value);
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Console.WriteLine("");
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//Advance the reader to the closing DAV:href node.
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XmlReader.Read();
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}
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}
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// Clean up.
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XmlReader.Close();
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ResponseStream.Close();
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Response.Close();
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}
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catch(Exception ex)
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{
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// Catch any exceptions. Any error codes from the SEARCH
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// method request on the server will be caught here, also.
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Console.WriteLine(ex.Message);
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}
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}
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}
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}
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31~33行构造了Web Storage System SQL查询的XML,去头去尾,对我们比较关键就是SELECT "DAV:href" FROM scope('hierarchical traversal of "+strRootURI+')。SQL查询相信大家都会的了。“DAV:href”是DAV属性,表示条目的URL。其他的还包括:DAV:displayname(条目通用名称)、DAV:isfolder(表示这个条目是否文件夹),DAV:则是Web Storage System(WSS)的名称空间了,当然还有如下的名称空间:“http://schemas.microsoft.com/exchange/”,“urn-schemas:calendar:”,“Urn:schemas:httpmail:”等等。各项具体属性可以在Exchange SDK中根据索引查找。scope是用于指定查询的位置和深度。而strRootURI则是要查询条目的路径。在Exchange中的每个条目都可以通过URL访问,其所有编程任务也是以URL为基础的。URL分为文件URL和HTTP URL,形式分别如下: ![](/Images/OutliningIndicators/None.gif)
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file://./backofficestorage/<domain-name>/<public -folder-tree-name>/<path>
http://<server-name>/<virtual-directory>/<virtual-path>
因此,我们可以拼接查询未读邮件数的查询语句
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37~41行创建了用于访问资源的NTLM的凭据。60行以后则是通过将服务器返回XML解析,通过查找XML节点中的属性得到查询结果。在这里,我实在搞不清楚XML节点属性名称有哪些,且在不同的方法下,形如a:displayname的前缀到底是指DAV:还是其他的名称空间,就干脆把后半段的方法改写了,直接将XML输出到文件中,方便查看。(顺便也学习了一下System.IO)
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名词解释:
Web Storage System:是一项数据库技术,随着Windows2000操作系统引入的,可用于存储、共享和管理很多类型的数据。WSS被组织为文件夹体系的形式。