example - webrequest post c# json

Cómo hacer una solicitud web HTTP POST

Question

¿Cómo puedo realizar una solicitud HTTP y enviar algunos datos utilizando el método POST ? Puedo hacer una solicitud GET pero no tengo idea de cómo hacer un POST .

Answer 1

Cuando se usa el espacio de nombres Windows.Web.Http , para POST en lugar de FormUrlEncodedContent escribimos HttpFormUrlEncodedContent. También la respuesta es tipo de HttpResponseMessage. El resto es como escribió Evan Mulawski.

Answer 2

Este es un ejemplo completo de trabajo de envío / recepción de datos en formato JSON. Usé VS2013 Express Edition.

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Web.Script.Serialization;
namespace ConsoleApplication1
{
class Customer
{
public string Name { get; set; }
public string Address { get; set; }
public string Phone { get; set; }
}
public class Program
{
private static readonly HttpClient _Client = new HttpClient();
private static JavaScriptSerializer _Serializer = new JavaScriptSerializer();
static void Main(string[] args)
{
Run().Wait();
}
static async Task Run()
{
string url = "http://www.example.com/api/Customer";
Customer cust = new Customer() { Name = "Example Customer", Address = "Some example address", Phone = "Some phone number" };
var json = _Serializer.Serialize(cust);
var response = await Request(HttpMethod.Post, url, json, new Dictionary<string, string>());
string responseText = await response.Content.ReadAsStringAsync();
List<YourCustomClassModel> serializedResult = _Serializer.Deserialize<List<YourCustomClassModel>>(responseText);
Console.WriteLine(responseText);
Console.ReadLine();
}
/// <summary>
/// Makes an async HTTP Request
/// </summary>
/// <param name="pMethod">Those methods you know: GET, POST, HEAD, etc...</param>
/// <param name="pUrl">Very predictable...</param>
/// <param name="pJsonContent">String data to POST on the server</param>
/// <param name="pHeaders">If you use some kind of Authorization you should use this</param>
/// <returns></returns>
static async Task<HttpResponseMessage> Request(HttpMethod pMethod, string pUrl, string pJsonContent, Dictionary<string, string> pHeaders)
{
var httpRequestMessage = new HttpRequestMessage();
httpRequestMessage.Method = pMethod;
httpRequestMessage.RequestUri = new Uri(pUrl);
foreach (var head in pHeaders)
{
httpRequestMessage.Headers.Add(head.Key, head.Value);
}
switch (pMethod.Method)
{
case "POST":
HttpContent httpContent = new StringContent(pJsonContent, Encoding.UTF8, "application/json");
httpRequestMessage.Content = httpContent;
break;
}
return await _Client.SendAsync(httpRequestMessage);
}
}
}

Answer 3

Hay algunas respuestas muy buenas aquí. Permítame publicar una manera diferente de configurar sus encabezados con el WebClient (). También te mostraré cómo configurar una clave API.

 var client = new WebClient();
string credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes(userName + ":" + passWord));
client.Headers[HttpRequestHeader.Authorization] = $"Basic {credentials}";
//If you have your data stored in an object serialize it into json to pass to the webclient with Newtonsoft''s JsonConvert
var encodedJson = JsonConvert.SerializeObject(newAccount);
client.Headers.Add($"x-api-key:{ApiKey}");
client.Headers.Add("Content-Type:application/json");
try
{
var response = client.UploadString($"{apiurl}", encodedJson);
//if you have a model to deserialize the json into Newtonsoft will help bind the data to the model, this is an extremely useful trick for GET calls when you have a lot of data, you can strongly type a model and dump it into an instance of that class.
Response response1 = JsonConvert.DeserializeObject<Response>(response);

Answer 4

Hay varias formas de realizar solicitudes HTTP GET y POST :

Método A: HttpClient

Disponible en: .NET Framework 4.5+, .NET Standard 1.1+, .NET Core 1.0+

Actualmente el enfoque preferido. Asincrónico. Versión portátil para otras plataformas disponibles a través de NuGet .

using System.Net.Http;

Preparar

Se recommended crear un HttpClient para la vida útil de su aplicación y compartirlo.

private static readonly HttpClient client = new HttpClient();

ENVIAR

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();

OBTENER

var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");

Método B: Bibliotecas de terceros

RestSharp

Biblioteca probada y probada para interactuar con las API REST. Portátil. Disponible a través de NuGet .

Flurl.Http

Nueva biblioteca con una API fluida y ayudantes de pruebas. HttpClient bajo el capó. Portátil. Disponible a través de NuGet .

using Flurl.Http;

ENVIAR

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

OBTENER

var responseString = await "http://www.example.com/recepticle.aspx"
.GetStringAsync();

Método C: Legado

Disponible en: .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

ENVIAR

var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");
var postData = "thing1=hello";
postData += "&thing2=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();

OBTENER

var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

Método D: WebClient (también ahora legado)

Disponible en: .NET Framework 1.1+, .NET Standard 2.0+, .NET Core 2.0+

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

ENVIAR

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);
}

OBTENER

using (var client = new WebClient())
{
var responseString = client.DownloadString("http://www.example.com/recepticle.aspx");
}

Answer 5

Puede usar IEnterprise.Easy-HTTP ya que tiene incorporado análisis de clase y creación de consultas:

await new RequestBuilder<ExampleObject>()
.SetHost("https://httpbin.org")
.SetContentType(ContentType.Application_Json)
.SetType(RequestType.Post)
.SetModelToSerialize(dto)
.Build()
.Execute();

Soy el autor de la biblioteca, así que no dude en hacer preguntas o consultar el código en github

Answer 6

Si te gusta la API fluida, puedes usar Tiny.RestClient que está disponible en Nuget

var client = new TinyRestClient(new HttpClient(), "http://MyAPI.com/api");
// POST
var city = new City() { Name = "Paris" , Country = "France"};
// With content
var response = await client.PostRequest("City", city).
ExecuteAsync<bool>();

¡Espero que ayude!

Answer 7

Solicitud GET simple

using System.Net;
...
using (var wb = new WebClient())
{
var response = wb.DownloadString(url);
}

Solicitud POST simple

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);
}

Answer 8

Solución simple (de una sola línea, sin comprobación de errores, sin espera de respuesta) que he encontrado hasta ahora

(new WebClient()).UploadStringAsync(new Uri(Address), dataString);‏

utilizar con precaución!

Answer 9

MSDN tiene una muestra.

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();
}
}
}

Answer 10

WebRequest usar la clase WebRequest y el método GetRequestStream .

Here hay un ejemplo.