我如何使用C＃中的REST API调用？ [英] How do I make calls to a REST api using c#?

问题描述

这是code我到目前为止有：

This is the code I have so far:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System;
using System.Net.Http;
using System.Web;
using System.Net;
using System.IO;

namespace ConsoleProgram
{
    public class Class1
    {
        private const string URL = "https://sub.domain.com/objects.json?api_key=123";
        private const string DATA = @"{""object"":{""name"":""Name""}}";

        static void Main(string[] args)
        {
            Class1.CreateObject();
        }

        private static void CreateObject()
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
            request.Method = "POST";
            request.ContentType = "application/json"; 
            request.ContentLength = DATA.Length;
            StreamWriter requestWriter = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
            requestWriter.Write(DATA);
            requestWriter.Close();

             try {
                WebResponse webResponse = request.GetResponse();
                Stream webStream = webResponse.GetResponseStream();
                StreamReader responseReader = new StreamReader(webStream);
                string response = responseReader.ReadToEnd();
                Console.Out.WriteLine(response);
                responseReader.Close();
            } catch (Exception e) {
                Console.Out.WriteLine("-----------------");
                Console.Out.WriteLine(e.Message);
            }

        }
    }
}

问题是，我觉得异常块被触发（因为当我删除的try-catch，我得到了一个服务器错误（500）消息，但我没有看到Console.Out行，我把在catch块。

The problem is that I think the exception block is being triggered (because when I remove the try-catch, I get a server error (500) message. But I don't see the Console.Out lines I put in the catch block.

我的控制台：

The thread 'vshost.NotifyLoad' (0x1a20) has exited with code 0 (0x0).
The thread '<No Name>' (0x1988) has exited with code 0 (0x0).
The thread 'vshost.LoadReference' (0x1710) has exited with code 0 (0x0).
'ConsoleApplication1.vshost.exe' (Managed (v4.0.30319)): Loaded 'c:\users\l. preston sego iii\documents\visual studio 11\Projects\ConsoleApplication1\ConsoleApplication1\bin\Debug\ConsoleApplication1.exe', Symbols loaded.
'ConsoleApplication1.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
A first chance exception of type 'System.Net.WebException' occurred in System.dll
The thread 'vshost.RunParkingWindow' (0x184c) has exited with code 0 (0x0).
The thread '<No Name>' (0x1810) has exited with code 0 (0x0).
The program '[2780] ConsoleApplication1.vshost.exe: Program Trace' has exited with code 0 (0x0).
The program '[2780] ConsoleApplication1.vshost.exe: Managed (v4.0.30319)' has exited with code 0 (0x0).

我使用Visual Studio 2011的Beta和.NET 4.5 Beta版。

I'm using Visual Studio 2011 Beta, and .NET 4.5 Beta.

推荐答案

在ASP.Net的Web API已经取代pviously提到的WCF的Web API $ P $。

The ASP.Net Web API has replaced the WCF Web API previously mentioned.

我想我会发布一个更新的答案，因为大多数这些反应都是从2012年初，这个线程是顶级的结果之一做一个谷歌搜索呼叫RESTful服务的C＃的时候。

I thought I'd post an updated answer since most of these responses are from early 2012, and this thread is one of the top results when doing a Google search for "call restful service c#".

从微软目前的指导是使用微软的ASP.NET Web API客户端库消费RESTful服务。这是作为一个包的NuGet，Microsoft.AspNet.WebApi.Client。

Current guidance from Microsoft is to use the Microsoft ASP.NET Web API Client Libraries to consume a RESTful service. This is available as a NuGet package, Microsoft.AspNet.WebApi.Client.

下面是当使用ASP.Net的Web API客户端库来实现你的榜样，会怎样看：

Here's how your example would look when implemented using the ASP.Net Web API Client Library:

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!
            if (response.IsSuccessStatusCode)
            {
                // Parse the response body. Blocking!
                var dataObjects = response.Content.ReadAsAsync<IEnumerable<DataObject>>().Result;
                foreach (var d in dataObjects)
                {
                    Console.WriteLine("{0}", d.Name);
                }
            }
            else
            {
                Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
            }  
        }
    }
}

有关详细信息，包括其他的例子，去这里：<一href=\"http://www.asp.net/web-api/overview/web-api-clients/calling-a-web-api-from-a-net-client\">http://www.asp.net/web-api/overview/web-api-clients/calling-a-web-api-from-a-net-client

For more details, including other examples, go here: http://www.asp.net/web-api/overview/web-api-clients/calling-a-web-api-from-a-net-client

本博客文章也可能是有用的：<一href=\"http://johnny$c$c.com/2012/02/23/consuming-your-own-asp-net-web-api-rest-service/\">http://johnny$c$c.com/2012/02/23/consuming-your-own-asp-net-web-api-rest-service/

This blog post may also be useful: http://johnnycode.com/2012/02/23/consuming-your-own-asp-net-web-api-rest-service/

这篇关于我如何使用C＃中的REST API调用？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！