1: Uri address = new Uri("http://127.0.0.1:3721/employees/001");

 2: var request = (HttpWebRequest)HttpWebRequest.Create(address);

 3: request.Method = "GET";

 4: var response = (HttpWebResponse)request.GetResponse();

 5: string employee;

 6: using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))

 7: {

 8: employee = reader.ReadToEnd();

 9: Console.WriteLine("獲取員工信息：");

10: Console.WriteLine(employee + "\n");

11: }

12: try

13: {

14: address = new Uri("http://127.0.0.1:3721/employees/");

15: request = (HttpWebRequest)HttpWebRequest.Create(address);

16: request.Method = "POST";

17: request.ContentType = "application/xml";

18: byte[] buffer = Encoding.UTF8.GetBytes(employee);

19: request.GetRequestStream().Write(Encoding.UTF8.GetBytes(employee), 0, buffer.Length);

20: request.Headers.Add(HttpRequestHeader.IfMatch, response.Headers[HttpResponseHeader.ETag]);

21: Console.WriteLine("修改員工信息:");

22: request.GetResponse();

23: }

24: catch (WebException ex)

25: {

26: response = ex.Response as HttpWebResponse;

27: if (null == response)

28: {

29: throw;

30: }

31: if (response.StatusCode == HttpStatusCode.PreconditionFailed)

32: {

33: Console.WriteLine("服務(wù)端數(shù)據(jù)已發(fā)生變化");

34: }

35: else

36: {

37: throw;

38: }

39: }