具体在哪看见的忘记了。
异步：
public static class CallWebAPI
{
public static async Task<string> APIPost(string url, string data)
{
string result = string.Empty;
//设置HttpClientHandler的AutomaticDecompression
var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
//创建HttpClient（注意传入HttpClientHandler）
using (var http = new HttpClient(handler))
{
//使用FormUrlEncodedContent做HttpContent
var content = new FormUrlEncodedContent(new Dictionary<string, string>()
{
//传递单个值
{"", data}//键名必须为空
//传递对象
//{"name","hello"},
//{"age","16"}
});
//await异步等待回应
var response = await http.PostAsync(url, content);
//确保HTTP成功状态值
response.EnsureSuccessStatusCode();
//await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
result = await response.Content.ReadAsStringAsync();
}
return result;
}
static async void APIGet(string url)
{
//创建HttpClient（注意传入HttpClientHandler）
var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
using (var http = new HttpClient(handler))
{
//await异步等待回应
var response = await http.GetAsync(url);
//确保HTTP成功状态值
response.EnsureSuccessStatusCode();
//await异步读取最后的JSON（注意此时gzip已经被自动解压缩了，因为上面的AutomaticDecompression = DecompressionMethods.GZip）
Console.WriteLine(await response.Content.ReadAsStringAsync());
}
}
}同步：
public static class RequestUtility
{
#region 同步方法
/// <summary>
/// 使用Get方法获取字符串结果（没有加入Cookie）
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static string HttpGet(string url, Encoding encoding = null)
{
WebClient wc = new WebClient();
wc.Encoding = encoding ?? Encoding.UTF8;
//if (encoding != null)
//{
// wc.Encoding = encoding;
//}
return wc.DownloadString(url);
}
/// <summary>
/// 使用Get方法获取字符串结果（加入Cookie）
/// </summary>
/// <param name="url"></param>
/// <param name="cookieContainer"></param>
/// <param name="encoding"></param>
/// <returns></returns>
public static string HttpGet(string url, CookieContainer cookieContainer = null, Encoding encoding = null, int timeOut = 10000)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "GET";
request.Timeout = timeOut;
if (cookieContainer != null)
{
request.CookieContainer = cookieContainer;
}
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
if (cookieContainer != null)
{
response.Cookies = cookieContainer.GetCookies(response.ResponseUri);
}
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader myStreamReader = new StreamReader(responseStream, encoding ?? Encoding.GetEncoding("utf-8")))
{
string retString = myStreamReader.ReadToEnd();
return retString;
}
}
}
/// <summary>
/// 使用Post方法获取字符串结果，常规提交
/// </summary>
/// <returns></returns>
public static string HttpPost(string url, CookieContainer cookieContainer = null, Dictionary<string, string> formData = null, Encoding encoding = null, int timeOut = 10000)
{
MemoryStream ms = new MemoryStream();
formData.FillFormDataStream(ms);//填充formData
return HttpPost(url, cookieContainer, ms, null, null, encoding, timeOut);
}
/// <summary>
/// 使用Post方法获取字符串结果
/// </summary>
/// <param name="url"></param>
/// <param name="cookieContainer"></param>
/// <param name="postStream"></param>
/// <param name="fileDictionary">需要上传的文件，Key：对应要上传的Name，Value：本地文件名</param>
/// <param name="timeOut"></param>
/// <returns></returns>
public static string HttpPost(string url, CookieContainer cookieContainer = null, Stream postStream = null, Dictionary<string, string> fileDictionary = null, string refererUrl = null, Encoding encoding = null, int timeOut = 10000)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.Timeout = timeOut;
#region 处理Form表单文件上传
var formUploadFile = fileDictionary != null && fileDictionary.Count > 0;//是否用Form上传文件
if (formUploadFile)
{
//通过表单上传文件
postStream = postStream ?? new MemoryStream();
string boundary = "----" + DateTime.Now.Ticks.ToString("x");
//byte[] boundarybytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
string fileFormdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n";
string dataFormdataTemplate = "\r\n--" + boundary +
"\r\nContent-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
foreach (var file in fileDictionary)
{
try
{
var fileName = file.Value;
//准备文件流
using (var fileStream = FileHelper.GetFileStream(fileName))
{
string formdata = null;
if (fileStream != null)
{
//存在文件
formdata = string.Format(fileFormdataTemplate, file.Key, /*fileName*/ Path.GetFileName(fileName));
}
else
{
//不存在文件或只是注释
formdata = string.Format(dataFormdataTemplate, file.Key, file.Value);
}
//统一处理
var formdataBytes = Encoding.ASCII.GetBytes(postStream.Length == 0 ? formdata.Substring(2, formdata.Length - 2) : formdata);//第一行不需要换行
postStream.Write(formdataBytes, 0, formdataBytes.Length);
//写入文件
if (fileStream != null)
{
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
postStream.Write(buffer, 0, bytesRead);
}
}
}
}
catch (Exception ex)
{
throw ex;
}
}
//结尾
var footer = Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
postStream.Write(footer, 0, footer.Length);
request.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
}
else
{
request.ContentType = "application/x-www-form-urlencoded";
}
#endregion
request.ContentLength = postStream != null ? postStream.Length : 0;
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
request.KeepAlive = true;
if (!string.IsNullOrEmpty(refererUrl))
{
request.Referer = refererUrl;
}
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";
if (cookieContainer != null)
{
request.CookieContainer = cookieContainer;
}
#region 输入二进制流
if (postStream != null)
{
postStream.Position = 0;
//直接写入流
Stream requestStream = request.GetRequestStream();
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = postStream.Read(buffer, 0, buffer.Length)) != 0)
{
requestStream.Write(buffer, 0, bytesRead);
}
//debug
postStream.Seek(0, SeekOrigin.Begin);
StreamReader sr = new StreamReader(postStream);
var postStr = sr.ReadToEnd();
postStream.Close();//关闭文件访问
}
#endregion
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
if (cookieContainer != null)
{
response.Cookies = cookieContainer.GetCookies(response.ResponseUri);
}
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader myStreamReader = new StreamReader(responseStream, encoding ?? Encoding.GetEncoding("utf-8")))
{
string retString = myStreamReader.ReadToEnd();
return retString;
}
}
}
#endregion
/// <summary>
/// 组装QueryString的方法
/// 参数之间用&连接，首位没有符号，如：a=1&b=2&c=3
/// </summary>
/// <param name="formData"></param>
/// <returns></returns>
public static string GetQueryString(this Dictionary<string, string> formData)
{
if (formData == null || formData.Count == 0)
{
return "";
}
StringBuilder sb = new StringBuilder();
var i = 0;
foreach (var kv in formData)
{
i++;
sb.AppendFormat("{0}={1}", kv.Key, kv.Value);
if (i < formData.Count)
{
sb.Append("&");
}
}
return sb.ToString();
}
/// <summary>
/// 填充表单信息的Stream
/// </summary>
/// <param name="formData"></param>
/// <param name="stream"></param>
public static void FillFormDataStream(this Dictionary<string, string> formData, Stream stream)
{
string dataString = GetQueryString(formData);
var formDataBytes = formData == null ? new byte[0] : Encoding.UTF8.GetBytes(dataString);
stream.Write(formDataBytes, 0, formDataBytes.Length);
stream.Seek(0, SeekOrigin.Begin);//设置指针读取位置
}
/// <summary>
/// 封装System.Web.HttpUtility.HtmlEncode
/// </summary>
/// <param name="html"></param>
/// <returns></returns>
public static string HtmlEncode(this string html)
{
return System.Web.HttpUtility.HtmlEncode(html);
}
/// <summary>
/// 封装System.Web.HttpUtility.HtmlDecode
/// </summary>
/// <param name="html"></param>
/// <returns></returns>
public static string HtmlDecode(this string html)
{
return System.Web.HttpUtility.HtmlDecode(html);
}
/// <summary>
/// 封装System.Web.HttpUtility.UrlEncode
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static string UrlEncode(this string url)
{
return System.Web.HttpUtility.UrlEncode(url);
}
/// <summary>
/// 封装System.Web.HttpUtility.UrlDecode
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static string UrlDecode(this string url)
{
return System.Web.HttpUtility.UrlDecode(url);
}
}FileHelper.cs
public class FileHelper
{
/// <summary>
/// 根据完整文件路径获取FileStream
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public static FileStream GetFileStream(string fileName)
{
FileStream fileStream = null;
if (!string.IsNullOrEmpty(fileName) && File.Exists(fileName))
{
fileStream = new FileStream(fileName, FileMode.Open);
}
return fileStream;
}
}