C#客户端网络请求对HttpClient的封装

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在写C#客户端程序时，或者在服务之间调用API时，我们往往会用到HttpClient来进行交互，这里我做了下简单的二次封装，并不定期更新。

下面是整个封装的HttpClient帮助类：

using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
 
namespace Common
{
    /// <summary>
    /// Summary: HttpClient公共类
    /// Author: Lee Liu
    /// Date: 20190114
    /// </summary>
    public class HttpClientHelper
    {
        private static HttpClientHelper httpClientHelper = null;
 
        private HttpClient httpClient;
 
        /// <summary>
        /// 构造方法私有，用于单例
        /// </summary>
        private HttpClientHelper() { }
 
        /// <summary>
        /// 获取当前类的实例
        /// </summary>
        /// <returns></returns>
        public static HttpClientHelper GetInstance()
        {
            if (httpClientHelper != null)
            {
                return httpClientHelper;
            }
            else
            {
                HttpClientHelper httpClientHelper = new HttpClientHelper();
 
                //取消使用默认的Cookies
                HttpClientHandler handler = new HttpClientHandler() { UseCookies = false };
                httpClientHelper.httpClient = new HttpClient(handler);
                return httpClientHelper;
            }
        }
 
        /// <summary>
        /// Get方法请求
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <returns></returns>
        public HttpResponseMessage Get(string url, List<KeyValuePair<string, string>> headers = null)
        {
            HttpRequestMessage request = new HttpRequestMessage()
            {
                RequestUri = new Uri(url),
                Method = HttpMethod.Get,
            };
            if (headers != null && headers.Count > 0)
            {
                request.Headers.Clear();
 
                foreach (var header in headers)
                {
                    request.Headers.Add(header.Key, header.Value);
 
                }
            }
            HttpResponseMessage response = httpClient.SendAsync(request).Result;
            return response;
        }
 
        /// <summary>
        /// Get方法请求
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <returns></returns>
        public async Task<HttpResponseMessage> GetAsync(string url, List<KeyValuePair<string, string>> headers = null)
        {
            HttpRequestMessage request = new HttpRequestMessage()
            {
                RequestUri = new Uri(url),
                Method = HttpMethod.Get,
            };
            if (headers != null && headers.Count > 0)
            {
                request.Headers.Clear();
                foreach (var header in headers)
                {
                    request.Headers.Add(header.Key, header.Value);
                }
            }
            return await httpClient.SendAsync(request);
        }
 
        /// <summary>
        /// Post方法请求 application/x-www-form-urlencoded格式
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <param name="paramList">参数集合</param>
        /// <returns></returns>
        public HttpResponseMessage Post(string url, List<KeyValuePair<String, String>> paramList, List<KeyValuePair<string, string>> headers = null)
        {
            FormUrlEncodedContent formUrlEncodedContent = new FormUrlEncodedContent(paramList);
            if (headers != null && headers.Count > 0)
            {
                formUrlEncodedContent.Headers.Clear();
                foreach (var header in headers)
                {
                    formUrlEncodedContent.Headers.Add(header.Key, header.Value);
                }
            }
            HttpResponseMessage response = httpClient.PostAsync(new Uri(url), formUrlEncodedContent).Result;
            return response;
        }
 
        public async Task<HttpResponseMessage> PostAsync(string url, List<KeyValuePair<String, String>> paramList, List<KeyValuePair<string, string>> headers = null)
        {
            FormUrlEncodedContent formUrlEncodedContent = new FormUrlEncodedContent(paramList);
            if (headers != null && headers.Count > 0)
            {
                formUrlEncodedContent.Headers.Clear();
                foreach (var header in headers)
                {
                    formUrlEncodedContent.Headers.Add(header.Key, header.Value);
                }
            }
            return await httpClient.PostAsync(new Uri(url), formUrlEncodedContent);
        }
 
        /// <summary>
        /// Post方法请求 raw data
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <param name="content">raw data</param>
        /// <returns></returns>
        public HttpResponseMessage Post(string url, string content, List<KeyValuePair<string, string>> headers = null)
        {
            StringContent stringContent = new StringContent(content, Encoding.UTF8);
            if (headers != null && headers.Count > 0)
            {
                stringContent.Headers.Clear();
                foreach (var header in headers)
                {
                    stringContent.Headers.Add(header.Key, header.Value);
                }
            }
 
            HttpResponseMessage response = httpClient.PostAsync(new Uri(url), stringContent).Result;
            return response;
        }
 
        /// <summary>
        /// Post方法请求 raw data
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <param name="content">raw data</param>
        /// <returns></returns>
        public async Task<HttpResponseMessage> PostAsync(string url, string content, List<KeyValuePair<string, string>> headers = null)
        {
            StringContent stringContent = new StringContent(content, Encoding.UTF8);
            if (headers != null && headers.Count > 0)
            {
                stringContent.Headers.Clear();
                foreach (var header in headers)
                {
                    stringContent.Headers.Add(header.Key, header.Value);
                }
            }
            return await httpClient.PostAsync(new Uri(url), stringContent);
 
        }
 
        /// <summary>
        /// 释放httpclient
        /// </summary>
        public void Release()
        {
            httpClient.Dispose();
        }
 
 
 
        /// <summary>
        /// 设置默认请求头
        /// </summary>
        /// <param name="name"></param>
        /// <param name="value"></param>
        public void SetDefaultHeaders(string name, string value)
        {
            httpClient.DefaultRequestHeaders.Add(name, value);
        }
 
        /// <summary>
        /// 删除默认请求头
        /// </summary>
        /// <param name="name"></param>
        public void RemoveDefaultHeaders(string name)
        {
            httpClient.DefaultRequestHeaders.Remove(name);
        }
    }
}