我如何能使一个HTTP POST请求和发送数据的主体?


当前回答

执行HTTP GET和POST请求有几种方法:


方法A: HttpClient(首选)

支持。net Framework 4.5+, . net Standard 1.1+, . net Core 1.0+。

它是目前首选的方法,并且是异步的和高性能的。在大多数情况下使用内置版本,但对于非常老的平台,有一个NuGet包。

using System.Net.Http;

设置

建议为应用程序的生命周期实例化一个HttpClient并共享它,除非您有特定的理由不这样做。

private static readonly HttpClient client = new HttpClient();

请参阅HttpClientFactory以获得依赖注入解决方案。


帖子 var values = new Dictionary<string, string> { {"thing1", "hello"}, {"thing2", "world"} }; var content = new FormUrlEncodedContent(values); var response = await client.PostAsync("http://www.example.com/recepticle.aspx", content); var responseString =等待response.Content.ReadAsStringAsync(); 得到 var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");


方法B:第三方库

休息夏普

帖子 var client = new RestClient("http://example.com"); / /客户端。Authenticator =新的HttpBasicAuthenticator(用户名,密码); var request = new RestRequest("resource/{id}"); 请求。AddParameter(“thing1”、“你好”); 请求。AddParameter(“事件”、“世界”); 请求。AddHeader(“标题”、“价值”); 请求。AddFile(“文件”,路径); var response = client.Post(请求); var content = response.Content;//原始内容为字符串 var response2 = client.Post<Person>(request); var name = response2.Data.Name;

Flurl。Http

它是一个更新的库,拥有一个流畅的API,测试助手,在底层使用HttpClient,并且是可移植的。它可以通过NuGet获得。

    using Flurl.Http;

帖子 var responseString = await“http://www.example.com/recepticle.aspx” .PostUrlEncodedAsync(new {thing1 = "hello", thing2 = "world"}) .ReceiveString (); 得到 var responseString = await“http://www.example.com/recepticle.aspx” .GetStringAsync ();


方法C: HttpWebRequest(不推荐用于新工作)

支持。net Framework 1.1+, . net Standard 2.0+, . net Core 1.0+。在。net Core中,它主要是为了兼容性——它包装了HttpClient,性能较差,并且不会获得新的特性。

using System.Net;
using System.Text;  // For class Encoding
using System.IO;    // For StreamReader

发布 var request = (HttpWebRequest)WebRequest.Create(“http://www.example.com/recepticle.aspx”); var postData = “thing1=” + Uri.EscapeDataString(“hello”); postData += “&thing2=” + Uri.EscapeDataString(“world”); var data = Encoding.ASCII.GetBytes(postData); 请求。方法 =“开机自检”; 请求。ContentType = “application/x-www-form-urlencoded”; 请求。内容长度 = 数据。长度; 使用 (var 流 = 请求。GetRequestStream()) { 流。写入(数据, 0, 数据.长度); } var response = (HttpWebResponse)request.获取响应(); var responseString = new StreamReader(response.GetResponseStream())。ReadToEnd(); 获取 var request = (HttpWebRequest)WebRequest.Create(“http://www.example.com/recepticle.aspx”); var response = (HttpWebResponse)request.获取响应(); var responseString = new StreamReader(response.GetResponseStream())。ReadToEnd();


方法D: WebClient(不推荐新作品)

这是一个HttpWebRequest的包装器。与HttpClient比较。

支持。NET Framework 1.1+, NET Standard 2.0+和。NET Core 2.0+。

在某些情况下…NET Framework 4.5-4.8),如果你需要同步地做一个HTTP请求,WebClient仍然可以使用。

using System.Net;
using System.Collections.Specialized;

帖子 使用(var client = new WebClient()) { var values = new NameValueCollection(); 值["thing1"] = "hello"; Values ["thing2"] = "world"; var response = client.UploadValues("http://www.example.com/recepticle.aspx", values); var responseString = Encoding.Default.GetString(response); } 得到 使用(var client = new WebClient()) { var responseString = client.DownloadString("http://www.example.com/recepticle.aspx"); }

其他回答

这是一个HTTPS web请求的例子。可以在PHP脚本中回显任何结果。最后,PHP回显字符串将在c#客户端显示为警报。

string url = "https://mydomain.ir/test1.php";
StringBuilder postData = new StringBuilder();
postData.Append(String.Format("{0}={1}&", HttpUtility.HtmlEncode("username"), HttpUtility.HtmlEncode("ali")));
postData.Append(String.Format("{0}={1}", HttpUtility.HtmlEncode("password"), HttpUtility.HtmlEncode("123456789")));
StringContent myStringContent = new StringContent(postData.ToString(), Encoding.UTF8, "application/x-www-form-urlencoded");
HttpClient client = new HttpClient();
HttpResponseMessage message = client.PostAsync(url, myStringContent).GetAwaiter().GetResult();
string responseContent = message.Content.ReadAsStringAsync().GetAwaiter().GetResult();

DisplayAlert("Your Feedback", responseContent, "OK");

PHP服务器端:

<?php
  if (isset($_POST["username"]) && $_POST["username"] == "ali") {
    echo "Yes, hi Ali";
  }
  else {
    echo "No, where is Ali?";
  }
?>

结果将是“Yes, hi Ali”。

这是为Xamarin形式。对于一个c# .NET应用程序,将DisplayAlert替换为:

MessageBox.show(responseContent);

执行HTTP GET和POST请求有几种方法:


方法A: HttpClient(首选)

支持。net Framework 4.5+, . net Standard 1.1+, . net Core 1.0+。

它是目前首选的方法,并且是异步的和高性能的。在大多数情况下使用内置版本,但对于非常老的平台,有一个NuGet包。

using System.Net.Http;

设置

建议为应用程序的生命周期实例化一个HttpClient并共享它,除非您有特定的理由不这样做。

private static readonly HttpClient client = new HttpClient();

请参阅HttpClientFactory以获得依赖注入解决方案。


帖子 var values = new Dictionary<string, string> { {"thing1", "hello"}, {"thing2", "world"} }; var content = new FormUrlEncodedContent(values); var response = await client.PostAsync("http://www.example.com/recepticle.aspx", content); var responseString =等待response.Content.ReadAsStringAsync(); 得到 var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");


方法B:第三方库

休息夏普

帖子 var client = new RestClient("http://example.com"); / /客户端。Authenticator =新的HttpBasicAuthenticator(用户名,密码); var request = new RestRequest("resource/{id}"); 请求。AddParameter(“thing1”、“你好”); 请求。AddParameter(“事件”、“世界”); 请求。AddHeader(“标题”、“价值”); 请求。AddFile(“文件”,路径); var response = client.Post(请求); var content = response.Content;//原始内容为字符串 var response2 = client.Post<Person>(request); var name = response2.Data.Name;

Flurl。Http

它是一个更新的库,拥有一个流畅的API,测试助手,在底层使用HttpClient,并且是可移植的。它可以通过NuGet获得。

    using Flurl.Http;

帖子 var responseString = await“http://www.example.com/recepticle.aspx” .PostUrlEncodedAsync(new {thing1 = "hello", thing2 = "world"}) .ReceiveString (); 得到 var responseString = await“http://www.example.com/recepticle.aspx” .GetStringAsync ();


方法C: HttpWebRequest(不推荐用于新工作)

支持。net Framework 1.1+, . net Standard 2.0+, . net Core 1.0+。在。net Core中,它主要是为了兼容性——它包装了HttpClient,性能较差,并且不会获得新的特性。

using System.Net;
using System.Text;  // For class Encoding
using System.IO;    // For StreamReader

发布 var request = (HttpWebRequest)WebRequest.Create(“http://www.example.com/recepticle.aspx”); var postData = “thing1=” + Uri.EscapeDataString(“hello”); postData += “&thing2=” + Uri.EscapeDataString(“world”); var data = Encoding.ASCII.GetBytes(postData); 请求。方法 =“开机自检”; 请求。ContentType = “application/x-www-form-urlencoded”; 请求。内容长度 = 数据。长度; 使用 (var 流 = 请求。GetRequestStream()) { 流。写入(数据, 0, 数据.长度); } var response = (HttpWebResponse)request.获取响应(); var responseString = new StreamReader(response.GetResponseStream())。ReadToEnd(); 获取 var request = (HttpWebRequest)WebRequest.Create(“http://www.example.com/recepticle.aspx”); var response = (HttpWebResponse)request.获取响应(); var responseString = new StreamReader(response.GetResponseStream())。ReadToEnd();


方法D: WebClient(不推荐新作品)

这是一个HttpWebRequest的包装器。与HttpClient比较。

支持。NET Framework 1.1+, NET Standard 2.0+和。NET Core 2.0+。

在某些情况下…NET Framework 4.5-4.8),如果你需要同步地做一个HTTP请求,WebClient仍然可以使用。

using System.Net;
using System.Collections.Specialized;

帖子 使用(var client = new WebClient()) { var values = new NameValueCollection(); 值["thing1"] = "hello"; Values ["thing2"] = "world"; var response = client.UploadValues("http://www.example.com/recepticle.aspx", values); var responseString = Encoding.Default.GetString(response); } 得到 使用(var client = new WebClient()) { var responseString = client.DownloadString("http://www.example.com/recepticle.aspx"); }

当使用Windows.Web.Http命名空间时,对于POST而不是FormUrlEncodedContent,我们编写HttpFormUrlEncodedContent。同样,响应类型为HttpResponseMessage。其余的就像Evan Mulawski写的那样。

MSDN有一个样本。

using System;
using System.IO;
using System.Net;
using System.Text;

namespace Examples.System.Net
{
    public class WebRequestPostExample
    {
        public static void Main()
        {
            // Create a request using a URL that can receive a post. 
            WebRequest request = WebRequest.Create("http://www.contoso.com/PostAccepter.aspx");
            // Set the Method property of the request to POST.
            request.Method = "POST";
            // Create POST data and convert it to a byte array.
            string postData = "This is a test that posts this string to a Web server.";
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            // Set the ContentType property of the WebRequest.
            request.ContentType = "application/x-www-form-urlencoded";
            // Set the ContentLength property of the WebRequest.
            request.ContentLength = byteArray.Length;
            // Get the request stream.
            Stream dataStream = request.GetRequestStream();
            // Write the data to the request stream.
            dataStream.Write(byteArray, 0, byteArray.Length);
            // Close the Stream object.
            dataStream.Close();
            // Get the response.
            WebResponse response = request.GetResponse();
            // Display the status.
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            // Get the stream containing content returned by the server.
            dataStream = response.GetResponseStream();
            // Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader(dataStream);
            // Read the content.
            string responseFromServer = reader.ReadToEnd();
            // Display the content.
            Console.WriteLine(responseFromServer);
            // Clean up the streams.
            reader.Close();
            dataStream.Close();
            response.Close();
        }
    }
}

c# . net

    using System.Net.Http;
    
    private static readonly HttpClient httpClient = new HttpClient();

//POST    
    var values = new Object();
    values[0] = "Value1";
    values[2] = "Value2";
    values[n] = "ValueN";

    var content = new FormUrlEncodedContent(values);
    var response = await httpClient.PostAsync("URL", content);
    var responseString = await response.Content.ReadAsStringAsync();

    

//GET
 var response = await httpClient.GetStringAsync("URL");