Kanoninis
Kaip atlikti HTTP užklausą ir išsiųsti tam tikrus duomenis naudojantPOST
**metodą?
Galiu atlikti GET
užklausą, bet neįsivaizduoju, kaip atlikti POST
užklausą.
Yra keletas būdų, kaip atlikti HTTP GET
ir POST
užklausas:
Tai yra HttpWebRequest
apvalkalas. Palyginkite su WebClient
.
Galima naudoti: NET Framework 4.5+, .NET Standard 1.1+
, .NET Core 1.0+
.
Šiuo metu pageidaujamas būdas. Asinchroninis. Nešiojamoji versija kitoms platformoms prieinama per [NuGet] (https://www.nuget.org/packages/Microsoft.Net.Http).
using System.Net.Http;
Rekomenduojama sukurti vieną HttpClient
, kuris bus naudojamas visą programos gyvavimo laiką, ir juo dalytis.
private static readonly HttpClient client = new HttpClient();
Žr. HttpClientFactory
apie priklausomybės įterpimo sprendimą.
POST
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();
GET
var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");
Patikrinta ir išbandyta biblioteka, skirta sąveikai su REST API. Nešiojama. Prieinama per NuGet.
Naujesnė biblioteka su sklandžia API ir testavimo pagalbininkais. HttpClient po gaubtu. Nešiojama. Prieinama per NuGet.
naudojant Flurl.Http;
POST
var responseString = await "http://www.example.com/recepticle.aspx"
.PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })
.ReceiveString();
GET
var responseString = await "http://www.example.com/recepticle.aspx"
.GetStringAsync();
Galima naudoti: NET Framework 1.1+,
.NET Standard 2.0+,
.NET Core 1.0+`
using System.Net;
using System.Text; // for class Encoding
using System.IO; // for StreamReader
POST
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();
GET
var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
Tai yra HttpWebRequest
apvalkalas. Palyginkite su HttpClient
.
Galima naudoti: NET Framework 1.1+,
NET Standard 2.0+,
.NET Core 2.0+,
.NET Core 2.0+`
using System.Net;
using System.Collections.Specialized;
POST
using (var client = new WebClient())
{
var values = new NameValueCollection();
values["thing1"] = "hello";
values["thing2"] = "world";
var response = client.UploadValues("http://www.example.com/recepticle.aspx", values);
var responseString = Encoding.Default.GetString(response);
}
GET
using (var client = new WebClient())
{
var responseString = client.DownloadString("http://www.example.com/recepticle.aspx");
}
Paprasta GET užklausa
using System.Net;
...
using (var wb = new WebClient())
{
var response = wb.DownloadString(url);
}
Paprasta POST užklausa
using System.Net;
using System.Collections.Specialized;
...
using (var wb = new WebClient())
{
var data = new NameValueCollection();
data["username"] = "myUser";
data["password"] = "myPassword";
var response = wb.UploadValues(url, "POST", data);
string responseInString = Encoding.UTF8.GetString(response);
}
MSDN yra pavyzdys.
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();
}
}
}