HttpClientHelper.cs

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

namespace Common
{
public class HttpClientHelper
{
public static string GetResponse(string url)
{
if (url.StartsWith("https"))
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
}

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

}

public static T GetResponse<T>(string url) where T:class,new ()
{
if (url.StartsWith("https"))
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
}
var httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.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;

}

public static string PostResponse(string url, string postData)
{
if (url.StartsWith("https"))
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
}

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

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

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

HttpContent httpContent = new StringContent(postData);
httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
var 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;
}

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

HttpContent httpContent = new StringContent(xmlString);
httpContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
var 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 = XmlDeserialize<T>(s);
}
return result;

}

public static T XmlDeserialize<T>(string xmlString) where T:class,new ()
{
try
{
var ser = new XmlSerializer(typeof(T));
using(var 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);
}
}
}
}