C#如何使用REST接口读写数据

因项目的需要，最近大量使用rest接口，项目进行的差不多了，把我在网上找到的资料，总结一下。

原网站：http://www.codeproject.com/Tips/497123/How-to-make-REST-requests-with-Csharp

前辈们写的一个类，我们拷贝下来直接调用就行：

using System;using System.IO;using System.Net;using System.Text;public enum HttpVerb{    GET,            //method  常用的就这几样，当然你也可以添加其他的   get：获取    post：修改    put：写入    delete：删除    POST,    PUT,    DELETE}namespace HttpUtils{  public class RestClient  {    public string EndPoint { get; set; }    //请求的url地址  eg：   http://215.23.12.45:8080/order/order_id=1&isdel=0    public HttpVerb Method { get; set; }    //请求的方法    public string ContentType { get; set; } //格式类型：我用的是application/json，text/xml具体使用什么，看需求吧    public string PostData { get; set; }    //传送的数据，当然了我使用的是json字符串    public RestClient()    {      EndPoint = "";      Method = HttpVerb.GET;      ContentType = "application/json";      PostData = "";    }    public RestClient(string endpoint)    {      EndPoint = endpoint;      Method = HttpVerb.GET;      ContentType = "application/json";      PostData = "";    }    public RestClient(string endpoint, HttpVerb method)    {      EndPoint = endpoint;      Method = method;      ContentType = "application/json";      PostData = "";    }    public RestClient(string endpoint, HttpVerb method, string postData)    {      EndPoint = endpoint;      Method = method;      ContentType = "application/json";      PostData = postData;    }    public string MakeRequest()    {      return MakeRequest("");    }    public string MakeRequest(string parameters)    {      var request = (HttpWebRequest)WebRequest.Create(EndPoint + parameters);      request.Method = Method.ToString();      request.ContentLength = 0;      request.ContentType = ContentType;      if (!string.IsNullOrEmpty(PostData) && Method == HttpVerb.POST)//如果传送的数据不为空，并且方法是post      {        var encoding = new UTF8Encoding();        var bytes = Encoding.GetEncoding("iso-8859-1").GetBytes(PostData);//编码方式按自己需求进行更改，我在项目中使用的是UTF-8        request.ContentLength = bytes.Length;        using (var writeStream = request.GetRequestStream())        {          writeStream.Write(bytes, 0, bytes.Length);        }      }      if (!string.IsNullOrEmpty(PostData) && Method == HttpVerb.PUT)//如果传送的数据不为空，并且方法是put      {        var encoding = new UTF8Encoding();        var bytes = Encoding.GetEncoding("iso-8859-1").GetBytes(PostData);//编码方式按自己需求进行更改，我在项目中使用的是UTF-8        request.ContentLength = bytes.Length;        using (var writeStream = request.GetRequestStream())        {          writeStream.Write(bytes, 0, bytes.Length);        }      }      using (var response = (HttpWebResponse)request.GetResponse())      {        var responseValue = string.Empty;        if (response.StatusCode != HttpStatusCode.OK)        {          var message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);          throw new ApplicationException(message);        }        // grab the response        using (var responseStream = response.GetResponseStream())        {          if (responseStream != null)            using (var reader = new StreamReader(responseStream))            {              responseValue = reader.ReadToEnd();            }        }        return responseValue;      }    }  } // class}

以上是类，我演示一下使用的方法：

1，基本的调用：

var client = new RestClient();string endPoint = @"http:\\myRestService.com\api\";var client = new RestClient(endPoint);var json = client.MakeRequest();

2，如果你想带入参数

var json = client.MakeRequest("?param=0");

3，使用最多的方式

var client = new RestClient();client.EndPoint = @"http:\\myRestService.com\api\"; ;client.ContentType = "application/json";client.Method = HttpVerb.POST;client.PostData = "{postData: value}";var json = client.MakeRequest();

一般情况，MakeRequest返回的json格式的字符串（不排除有的接口开发商返回xml，html），我们可以把他转化为json对象，然后通过C#代码操控json对象，就会方便的很。当然jquery也很方便。看个人喜好。接下来依次总结“json，linq to json ，linq to xml”等操作。