How to Send HTTP POST Requests in .NET Using HttpClient, RestSharp, and Other Methods?

.NET platform sends a variety of methods to send HTTP post requests detailed

This article will fully explain how to send HTTP post requests under the .NET framework. This is a common method for sending data to the server for processing.

Recommended method: httpclient

In the .NET, using the

class is the preferred method for sending HTTP requests. It provides a high -performance asynchronous way to send requests and receiving responses. HttpClient

<code class="language-csharp">// 初始化
private static readonly HttpClient client = new HttpClient();

// POST 请求
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 = await response.Content.ReadAsStringAsync();</code>

Method 2: The third party library

RESTSHARP

RESTSHARP is a popular third -party HTTP request library that provides convenient and easy -to -use APIs and rich functions.

Flurl.http

<code class="language-csharp">// POST 请求
var client = new RestClient("http://example.com");
var request = new RestRequest("resource/{id}");
request.AddParameter("thing1", "Hello");
request.AddParameter("thing2", "world");
var response = client.Post(request);
var content = response.Content; // 原始字符串内容</code>

Flurl.http is a newer library, with smooth API and portable.

Method 3: httpwebrequest

<code class="language-csharp">// POST 请求
var responseString = await "http://www.example.com/recepticle.aspx"
    .PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })
    .ReceiveString();</code>

abandoned

is an older method. It is not recommended for new projects, because its performance is low and the function is not as good as .

Method 4: Webclient HttpWebRequest HttpClient abandoned

<code class="language-csharp">// POST 请求
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);

request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;

using (var stream = request.GetRequestStream())
{
    stream.Write(data, 0, data.Length);
}

var response = (HttpWebResponse)request.GetResponse();

var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();</code>

is a

packaging device, which is usually not recommended for new projects.

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