C＃如何正确发出http Web GET请求 [英] C# how to properly make a http web GET request
问题描述
我对C＃还是陌生的，我正在尝试为此页面创建一个应用程序，该应用程序将在收到通知（答复，评论等）时告诉我。但是现在，我只是尝试对将获取用户数据的api进行简单调用。
i am still new on c# and i'm trying to create an application for this page that will tell me when i get a notification (answered, commented, etc..). But for now i'm just trying to make a simple call to the api which will get the user's data.
我正在使用Visual Studio Express 2012构建C＃。应用程序，在这里（现在）输入用户ID，因此应用程序将使用用户ID进行请求，并显示该用户ID的统计信息。
i'm using Visual studio express 2012 to build the C# application, where (for now) you enter your user id, so the application will make the request with the user id and show the stats of this user id.
我尝试发出请求的代码：
here is the code where i'm trying to make the request:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//Request library
using System.Net;
using System.IO;
namespace TestApplication
{
class Connect
{
public string id;
public string type;
protected string api = "https://api.stackexchange.com/2.2/";
protected string options = "?order=desc&sort=name&site=stackoverflow";
public string request()
{
string totalUrl = this.join(id);
return this.HttpGet(totalUrl);
}
protected string join(string s)
{
return api + type + "/" + s + options;
}
protected string get(string url)
{
try
{
string rt;
WebRequest request = WebRequest.Create(url);
WebResponse response = request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
rt = reader.ReadToEnd();
Console.WriteLine(rt);
reader.Close();
response.Close();
return rt;
}
catch(Exception ex)
{
return "Error: " + ex.Message;
}
}
public string HttpGet(string URI)
{
WebClient client = new WebClient();
// Add a user agent header in case the
// requested URI contains a query.
client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
Stream data = client.OpenRead(URI);
StreamReader reader = new StreamReader(data);
string s = reader.ReadToEnd();
data.Close();
reader.Close();
return s;
}
}
}
该类是一个对象，
我尝试了很多我在google上看到的示例，但不知道为什么我一直在处理此消息。。
i have tried many of the examples i have looked on google, but not clue why i am getting on all ways this message "�".
如果有人可以共享一本显示如何执行此操作的书或教程，我是这种算法的新手一种东西（解释每个步骤），我将不胜感激
i am new in this kind of algorithm, if anyone can share a book or tutorial that shows how to do this kind of stuff (explaining each step), i would appreciate it
推荐答案
服务器有时会压缩其响应以节省带宽，发生这种情况时，您需要先解压缩响应，然后再尝试读取它。幸运的是，.NET框架可以自动执行此操作，但是，我们必须打开该设置。
Servers sometimes compress their responses to save on bandwidth, when this happens, you need to decompress the response before attempting to read it. Fortunately, the .NET framework can do this automatically, however, we have to turn the setting on.
以下是如何实现此目的的示例。
Here's an example of how you could achieve that.
string html = string.Empty;
string url = @"https://api.stackexchange.com/2.2/answers?order=desc&sort=activity&site=stackoverflow";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.AutomaticDecompression = DecompressionMethods.GZip;
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using (Stream stream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(stream))
{
html = reader.ReadToEnd();
}
Console.WriteLine(html);
编辑 17/11/23
已更新为使用GET请求和POST异步使用示例
EDIT 23/11/17
Updated to throw out examples using async for both GET requests as well as POST
获取
public string Get(string uri)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
using(HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using(Stream stream = response.GetResponseStream())
using(StreamReader reader = new StreamReader(stream))
{
return reader.ReadToEnd();
}
}
获取异步
public async Task<string> GetAsync(string uri)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
using(HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync())
using(Stream stream = response.GetResponseStream())
using(StreamReader reader = new StreamReader(stream))
{
return await reader.ReadToEndAsync();
}
}
POST
如果您希望使用其他HTTP方法（例如PUT，DELETE）包含参数 method ，ETC
POST
Contains the parameter method in the event you wish to use other HTTP methods such as PUT, DELETE, ETC
public string Post(string uri, string data, string contentType, string method = "POST")
{
byte[] dataBytes = Encoding.UTF8.GetBytes(data);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
request.ContentLength = dataBytes.Length;
request.ContentType = contentType;
request.Method = method;
using(Stream requestBody = request.GetRequestStream())
{
requestBody.Write(dataBytes, 0, dataBytes.Length);
}
using(HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using(Stream stream = response.GetResponseStream())
using(StreamReader reader = new StreamReader(stream))
{
return reader.ReadToEnd();
}
}
POST异步
如果您希望使用其他HTTP方法（例如PUT）包含参数方法，删除，ETC
POST async
Contains the parameter method in the event you wish to use other HTTP methods such as PUT, DELETE, ETC
public async Task<string> PostAsync(string uri, string data, string contentType, string method = "POST")
{
byte[] dataBytes = Encoding.UTF8.GetBytes(data);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
request.ContentLength = dataBytes.Length;
request.ContentType = contentType;
request.Method = method;
using(Stream requestBody = request.GetRequestStream())
{
await requestBody.WriteAsync(dataBytes, 0, dataBytes.Length);
}
using(HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync())
using(Stream stream = response.GetResponseStream())
using(StreamReader reader = new StreamReader(stream))
{
return await reader.ReadToEndAsync();
}
}
这篇关于C＃如何正确发出http Web GET请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
