HttpClient

提供基本类，用于发送 HTTP 请求和接收来自经过 URI 确认的资源的 HTTP 响应。HttpClient是一个高级 API，用于包装其运行的每一个平台上可用的较低级别功能。

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Serialization;


public class HttpClientHelpClass
{
    /// <summary>
    /// get请求
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    public static string GetResponse(string url, out string statusCode)
    {
        if (url.StartsWith("https"))
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

        var httpClient = new HttpClient();
        httpClient.DefaultRequestHeaders.Accept.Add(      new MediaTypeWithQualityHeaderValue("application/json"));
        HttpResponseMessage response = httpClient.GetAsync(url).Result;
        statusCode = response.StatusCode.ToString();
        if (response.IsSuccessStatusCode)
        {
            string result = response.Content.ReadAsStringAsync().Result;
            return result;
        }
        return null;
    }

    public static string RestfulGet(string url)
    {
        HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
        // Get response
        using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
        {
            // Get the response stream
            StreamReader reader = new StreamReader(response.GetResponseStream());
            // Console application output
            return reader.ReadToEnd();
        }
    }

    public static T GetResponse<T>(string url)
       where T : class, new()
    {
        if (url.StartsWith("https"))
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

        var httpClient = new HttpClient();
        httpClient.DefaultRequestHeaders.Accept.Add(   new MediaTypeWithQualityHeaderValue("application/json"));
        HttpResponseMessage response = httpClient.GetAsync(url).Result;

        T result = default(T);

        if (response.IsSuccessStatusCode)
        {
            Task<string> t = response.Content.ReadAsStringAsync();
            string s = t.Result;

            result = JsonConvert.DeserializeObject<T>(s);
        }
        return result;
    }

    /// <summary>
    /// post请求
    /// </summary>
    /// <param name="url"></param>
    /// <param name="postData">post数据</param>
    /// <returns></returns>
    public static string PostResponse(string url, string postData, out string statusCode)
    {
        if (url.StartsWith("https"))
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

        HttpContent httpContent = new StringContent(postData);
        httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        httpContent.Headers.ContentType.CharSet = "utf-8";

        HttpClient httpClient = new HttpClient();
        //httpClient..setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "utf-8");

        HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

        statusCode = response.StatusCode.ToString();
        if (response.IsSuccessStatusCode)
        {
            string result = response.Content.ReadAsStringAsync().Result;
            return result;
        }

        return null;
    }

    /// <summary>
    /// 发起post请求
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="url">url</param>
    /// <param name="postData">post数据</param>
    /// <returns></returns>
    public static T PostResponse<T>(string url, string postData)
        where T : class, new()
    {
        if (url.StartsWith("https"))
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

        HttpContent httpContent = new StringContent(postData);
        httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        HttpClient httpClient = new HttpClient();

        T result = default(T);

        HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

        if (response.IsSuccessStatusCode)
        {
            Task<string> t = response.Content.ReadAsStringAsync();
            string s = t.Result;

            result = JsonConvert.DeserializeObject<T>(s);
        }
        return result;
    }


    /// <summary>
    /// 反序列化Xml
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="xmlString"></param>
    /// <returns></returns>
    public static T XmlDeserialize<T>(string xmlString)
        where T : class, new()
    {
        try
        {
            XmlSerializer ser = new XmlSerializer(typeof(T));
            using (StringReader reader = new StringReader(xmlString))
            {
                return (T)ser.Deserialize(reader);
            }
        }
        catch (Exception ex)
        {
            throw new Exception("XmlDeserialize发生异常：xmlString:" + xmlString + "异常信息：" + ex.Message);
        }

    }

    public static string PostResponse(string url, string postData, string token, string appId, string serviceURL, out string statusCode)
    {
        if (url.StartsWith("https"))
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

        HttpContent httpContent = new StringContent(postData);
        httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        httpContent.Headers.ContentType.CharSet = "utf-8";

        httpContent.Headers.Add("token", token);
        httpContent.Headers.Add("appId", appId);
        httpContent.Headers.Add("serviceURL", serviceURL);


        HttpClient httpClient = new HttpClient();
        //httpClient..setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "utf-8");

        HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

        statusCode = response.StatusCode.ToString();
        if (response.IsSuccessStatusCode)
        {
            string result = response.Content.ReadAsStringAsync().Result;
            return result;
        }

        return null;
    }

    /// <summary>
    /// 修改API
    /// </summary>
    /// <param name="url"></param>
    /// <param name="postData"></param>
    /// <returns></returns>
    public static string KongPatchResponse(string url, string postData)
    {
        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.ContentType = "application/x-www-form-urlencoded";
        httpWebRequest.Method = "PATCH";

        byte[] btBodys = Encoding.UTF8.GetBytes(postData);
        httpWebRequest.ContentLength = btBodys.Length;
        httpWebRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);

        HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        var streamReader = new StreamReader(httpWebResponse.GetResponseStream());
        string responseContent = streamReader.ReadToEnd();

        httpWebResponse.Close();
        streamReader.Close();
        httpWebRequest.Abort();
        httpWebResponse.Close();

        return responseContent;
    }

    /// <summary>
    /// 建立API
    /// </summary>
    /// <param name="url"></param>
    /// <param name="postData"></param>
    /// <returns></returns>
    public static string KongAddResponse(string url, string postData)
    {
        if (url.StartsWith("https"))
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
        HttpContent httpContent = new StringContent(postData);
        httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded") { CharSet = "utf-8" };
        var httpClient = new HttpClient();
        HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;
        if (response.IsSuccessStatusCode)
        {
            string result = response.Content.ReadAsStringAsync().Result;
            return result;
        }
        return null;
    }

    /// <summary>
    /// 删除API
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    public static bool KongDeleteResponse(string url)
    {
        if (url.StartsWith("https"))
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

        var httpClient = new HttpClient();
        HttpResponseMessage response = httpClient.DeleteAsync(url).Result;
        return response.IsSuccessStatusCode;
    }

    /// <summary>
    /// 修改或者更改API        
    /// </summary>
    /// <param name="url"></param>
    /// <param name="postData"></param>
    /// <returns></returns>
    public static string KongPutResponse(string url, string postData)
    {
        if (url.StartsWith("https"))
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

        HttpContent httpContent = new StringContent(postData);
        httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded") { CharSet = "utf-8" };

        var httpClient = new HttpClient();
        HttpResponseMessage response = httpClient.PutAsync(url, httpContent).Result;
        if (response.IsSuccessStatusCode)
        {
            string result = response.Content.ReadAsStringAsync().Result;
            return result;
        }
        return null;
    }

    /// <summary>
    /// 检索API
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    public static string KongSerchResponse(string url)
    {
        if (url.StartsWith("https"))
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

        var httpClient = new HttpClient();
        HttpResponseMessage response = httpClient.GetAsync(url).Result;
        if (response.IsSuccessStatusCode)
        {
            string result = response.Content.ReadAsStringAsync().Result;
            return result;
        }
        return null;
    }
}