如何使用C＃调用REST api？

ASP.Net Web API取代了前面提到的WCF Web API。

我想我应该发布更新的答案，因为这些回复大多数都来自2012年初，而该线程是在Google搜索“呼叫宁静的服务c＃”时的最佳结果之一。

Microsoft当前的指南是使用Microsoft ASP.NET Web
API客户端库来使用RESTful服务。它可以作为NuGet包Microsoft.AspNet.WebApi.Client使用。您将需要将此NuGet软件包添加到您的解决方案中。

使用ASP.Net Web API客户端库实现时，示例如下所示：

using System;using System.Collections.Generic;using System.Net.Http;using System.Net.Http.Headers;namespace ConsoleProgram{    public class DataObject    {        public string Name { get; set; }    }    public class Class1    {        private const string URL = "https://sub.domain.com/objects.json";        private string urlParameters = "?api_key=123";        static void Main(string[] args)        { HttpClient client = new HttpClient(); client.baseAddress = new Uri(URL); // Add an Accept header for JSON format. client.DefaultRequestHeaders.Accept.Add( new MediaTypeWithQualityHeaderValue("application/json")); // List data response. HttpResponseMessage response = client.GetAsync(urlParameters).Result;  // Blocking call! Program will wait here until a response is received or a timeout occurs. if (response.IsSuccessStatusCode) {     // Parse the response body.     var dataObjects = response.Content.ReadAsAsync<IEnumerable<DataObject>>().Result;  //Make sure to add a reference to System.Net.Http.Formatting.dll     foreach (var d in dataObjects)     {         Console.WriteLine("{0}", d.Name);     } } else {     Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase); } //Make any other calls using HttpClient here. //Dispose once all HttpClient calls are complete. This is not necessary if the containing object will be disposed of; for example in this case the HttpClient instance will be disposed automatically when the application terminates so the following call is superfluous. client.Dispose();        }    }}

如果计划发出多个请求，则应重新使用HttpClient实例。有关为什么在这种情况下HttpClient实例上不使用using语句的更多详细信息，请参见此问题及其答案：是否必须处置HttpClient和HttpClientHandler？

有关更多详细信息，包括其他示例，请转到此处：http : //www.asp.net/web-
api/overview/web-api-clients/calling-a-web-api-from-a-net-
client

该博客文章也可能有用：http : //johnnypre.com/2012/02/23/consumption-your-own-
asp-net-web-api-rest-service/