C#如何使用REST接口读写数据

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

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.comapi";
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.comapi"; ;
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。