实例详解C#实现http不同方法的请求

1、不带参数的post请求

public static string post(string url) 
{ 
  string result = ""; 
  httpwebrequest req = (httpwebrequest)webrequest.create(url); 
  req.method = "post"; 
  httpwebresponse resp = (httpwebresponse)req.getresponse(); 
  stream stream = resp.getresponsestream(); 
  //获取内容 
  using (streamreader reader = new streamreader(stream, encoding.utf8)) 
  { 
    result = reader.readtoend(); 
  } 
  return result; 
} 

2、带参数的post请求

public static string post(string url,dictionary<string,string> dic) 
{ 
  string result = ""; 
  httpwebrequest req = (httpwebrequest)webrequest.create(url); 
  req.method = "post"; 
  req.contenttype = "application/x-www-form-urlencoded"; 
  #region 添加post 参数 
  stringbuilder builder = new stringbuilder(); 
  int i = 0; 
  foreach (var item in dic) 
  { 
    if (i > 0) 
      builder.append("&"); 
    builder.appendformat("{0}={1}", item.key, item.value); 
    i++; 
  } 
  byte[] data = encoding.utf8.getbytes(builder.tostring()); 
  req.contentlength = data.length; 
  using (stream reqstream = req.getrequeststream()) 
  { 
    reqstream.write(data, 0, data.length); 
    reqstream.close(); 
  } 
  #endregion 
  httpwebresponse resp = (httpwebresponse)req.getresponse(); 
  stream stream = resp.getresponsestream(); 
  //获取响应内容 
  using (streamreader reader = new streamreader(stream, encoding.utf8)) 
  { 
    result = reader.readtoend(); 
  } 
  return result; 
} 

3、不带参数的get请求

public static string get(string url) 
{ 
  string result = ""; 
  httpwebrequest req = (httpwebrequest)webrequest.create(url); 
  httpwebresponse resp = (httpwebresponse)req.getresponse(); 
  stream stream = resp.getresponsestream(); 
  try 
  { 
    //获取内容 
    using (streamreader reader = new streamreader(stream)) 
    { 
      result = reader.readtoend(); 
    } 
  } 
  finally 
  { 
    stream.close(); 
  } 
  return result; 
} 

4、带参数的get请求

public static string get(string url, dictionary<string, string> dic) 
{ 
  string result = ""; 
  stringbuilder builder = new stringbuilder(); 
  builder.append(url); 
  if (dic.count > 0) 
  { 
    builder.append("?"); 
    int i = 0; 
    foreach (var item in dic) 
    { 
      if (i > 0) 
        builder.append("&"); 
      builder.appendformat("{0}={1}", item.key, item.value); 
      i++; 
    } 
  } 
  httpwebrequest req = (httpwebrequest)webrequest.create(builder.tostring()); 
  //添加参数 
  httpwebresponse resp = (httpwebresponse)req.getresponse(); 
  stream stream = resp.getresponsestream(); 
  try 
  { 
    //获取内容 
    using (streamreader reader = new streamreader(stream)) 
    { 
      result = reader.readtoend(); 
    } 
  } 
  finally 
  { 
    stream.close(); 
  } 
  return result; 
} 

5、自定义http请求头

httpwebrequest req = (httpwebrequest)webrequest.create(url); 
req.method = "get"; 
req.headers["accept-language"] = "zh-cn,zh;q=0.8"; 
req.referer = "https://www.baidu.com/"; 
httpwebresponse resp = (httpwebresponse)req.getresponse(); 
stream stream = resp.getresponsestream(); string result = ""; //注意，此处使用的编码是：gb2312 //using (streamreader reader = new streamreader(stream, encoding.default)) using (streamreader reader = new streamreader(stream, encoding.getencoding("gb2312"))) 
{ 
  result = reader.readtoend(); 
}