如何使用c#调用REST API ?

这是我到目前为止的代码:

    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);
            }

        }
    }

问题是我认为异常块正在被触发(因为当我删除try-catch时，我得到一个服务器错误(500)消息。但是我没有看到控制台。我在catch block里放了几行。

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).

当前回答

GET:

// GET JSON Response
public WeatherResponseModel GET(string url) {
    WeatherResponseModel model = new WeatherResponseModel();
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    try {
        WebResponse response = request.GetResponse();
        using(Stream responseStream = response.GetResponseStream()) {
            StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
            model = JsonConvert.DeserializeObject < WeatherResponseModel > (reader.ReadToEnd());
        }
    } catch (WebException ex) {
        WebResponse errorResponse = ex.Response;
        using(Stream responseStream = errorResponse.GetResponseStream()) {
            StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"));
            String errorText = reader.ReadToEnd();
            // Log errorText
        }
        throw;
    }
    return model;
}

职位:

// POST a JSON string
void POST(string url, string jsonContent) {
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    request.Method = "POST";

    System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
    Byte[]byteArray = encoding.GetBytes(jsonContent);

    request.ContentLength = byteArray.Length;
    request.ContentType =  @ "application/json";

    using(Stream dataStream = request.GetRequestStream()) {
        dataStream.Write(byteArray, 0, byteArray.Length);
    }

    long length = 0;
    try {
        using(HttpWebResponse response = (HttpWebResponse)request.GetResponse()) {
            // Got response
            length = response.ContentLength;
        }
    } catch (WebException ex) {
        WebResponse errorResponse = ex.Response;
        using(Stream responseStream = errorResponse.GetResponseStream()) {
            StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"));
            String errorText = reader.ReadToEnd();
            // Log errorText
        }
        throw;
    }
}

注意:为了序列化和反序列化JSON，我使用了Newtonsoft。Json NuGet包。

2017-09-06 18:46:51

其他回答

一种ASP解决方案。NET核心:

using Newtonsoft.Json;
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;

namespace WebApp
{
    public static class HttpHelper
    {
        // In my case this is https://localhost:44366/
        private static readonly string apiBasicUri = ConfigurationManager.AppSettings["apiBasicUri"];

        public static async Task Post<T>(string url, T contentValue)
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(apiBasicUri);
                var content = new StringContent(JsonConvert.SerializeObject(contentValue), Encoding.UTF8, "application/json");
                var result = await client.PostAsync(url, content);
                result.EnsureSuccessStatusCode();
            }
        }

        public static async Task Put<T>(string url, T stringValue)
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(apiBasicUri);
                var content = new StringContent(JsonConvert.SerializeObject(stringValue), Encoding.UTF8, "application/json");
                var result = await client.PutAsync(url, content);
                result.EnsureSuccessStatusCode();
            }
        }

        public static async Task<T> Get<T>(string url)
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(apiBasicUri);
                var result = await client.GetAsync(url);
                result.EnsureSuccessStatusCode();
                string resultContentString = await result.Content.ReadAsStringAsync();
                T resultContent = JsonConvert.DeserializeObject<T>(resultContentString);
                return resultContent;
            }
        }

        public static async Task Delete(string url)
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(apiBasicUri);
                var result = await client.DeleteAsync(url);
                result.EnsureSuccessStatusCode();
            }
        }
    }
}

要发布，可以使用这样的代码:

await HttpHelper.Post<Setting>($"/api/values/{id}", setting);

删除示例:

await HttpHelper.Delete($"/api/values/{id}");

获取列表的示例:

List<ClaimTerm> claimTerms = await HttpHelper.Get<List<ClaimTerm>>("/api/values/");

示例只获取一个:

ClaimTerm processedClaimImage = await HttpHelper.Get<ClaimTerm>($"/api/values/{id}");

2019-02-08 10:23:50

GET:

// GET JSON Response
public WeatherResponseModel GET(string url) {
    WeatherResponseModel model = new WeatherResponseModel();
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    try {
        WebResponse response = request.GetResponse();
        using(Stream responseStream = response.GetResponseStream()) {
            StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
            model = JsonConvert.DeserializeObject < WeatherResponseModel > (reader.ReadToEnd());
        }
    } catch (WebException ex) {
        WebResponse errorResponse = ex.Response;
        using(Stream responseStream = errorResponse.GetResponseStream()) {
            StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"));
            String errorText = reader.ReadToEnd();
            // Log errorText
        }
        throw;
    }
    return model;
}

职位:

// POST a JSON string
void POST(string url, string jsonContent) {
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    request.Method = "POST";

    System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
    Byte[]byteArray = encoding.GetBytes(jsonContent);

    request.ContentLength = byteArray.Length;
    request.ContentType =  @ "application/json";

    using(Stream dataStream = request.GetRequestStream()) {
        dataStream.Write(byteArray, 0, byteArray.Length);
    }

    long length = 0;
    try {
        using(HttpWebResponse response = (HttpWebResponse)request.GetResponse()) {
            // Got response
            length = response.ContentLength;
        }
    } catch (WebException ex) {
        WebResponse errorResponse = ex.Response;
        using(Stream responseStream = errorResponse.GetResponseStream()) {
            StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"));
            String errorText = reader.ReadToEnd();
            // Log errorText
        }
        throw;
    }
}

注意:为了序列化和反序列化JSON，我使用了Newtonsoft。Json NuGet包。

2017-09-06 18:46:51

查看Refit从. net调用REST服务。我发现它很容易使用:

改装:自动类型安全的REST库。net Core, Xamarin和 net Refit是一个很大程度上受到Square的Retrofit库启发的库它把你的REST API变成一个活动接口:

public interface IGitHubApi {
        [Get("/users/{user}")]
        Task<User> GetUser(string user);
}

// The RestService class generates an implementation of IGitHubApi
// that uses HttpClient to make its calls:

var gitHubApi = RestService.For<IGitHubApi>("https://api.github.com");

var octocat = await gitHubApi.GetUser("octocat");

2016-10-19 17:48:28

在使用。net 4.5或。net Core时调用REST API

我推荐DalSoft。RestClient(注意:是我创建的)。原因是，因为它使用动态类型，您可以在一个流畅的调用中包装所有内容，包括序列化/反序列化。下面是一个工作的PUT示例:

dynamic client = new RestClient("http://jsonplaceholder.typicode.com");

var post = new Post { title = "foo", body = "bar", userId = 10 };

var result = await client.Posts(1).Put(post);

2015-03-23 14:55:46

这是可以肯定工作的示例代码。我花了一天的时间来从REST服务中读取一组对象:

RootObject是我从REST服务中读取的对象类型。

string url = @"http://restcountries.eu/rest/v1";
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(IEnumerable<RootObject>));
WebClient syncClient = new WebClient();
string content = syncClient.DownloadString(url);

using (MemoryStream memo = new MemoryStream(Encoding.Unicode.GetBytes(content)))
{
    IEnumerable<RootObject> countries = (IEnumerable<RootObject>)serializer.ReadObject(memo);
}

Console.Read();

2014-09-21 18:06:18

如何使用c#调用REST API ?

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