WebClient not found in mobile development in c#

Rahul Kiwitech
Rahul K...
Participant
100 Points
40 Posts

Hi,

I am try to call JSON API in windows phone 8.1 in VS 2015. I am using WebClient to call but getting compile time error "C# The type or namespace name 'WebClient' could not be found (are you missing a using directive or an assembly reference?)".

I am try to implement following code:

public void CallPostAPI() {
WebClient wc = new WebClient();
var URI = new Uri("https://your_uri_goes_here");
wc.Headers["Content-Type"] = "application/json";
wc.UploadStringCompleted += new UploadStringCompletedEventHandler(CallPostAPICompleted);
wc.UploadStringAsync(URI, "POST", "Data_To_Be_sent");
}
void CallPostAPICompleted(object sender, UploadStringCompletedEventArgs e) {
try {
var result = e.Result;
} catch (Exception exc) {
//
}
}

 

Thanks in advance.

Views: 8201
Total Answered: 2
Total Marked As Answer: 0
Posted On: 05-Jun-2016 05:26

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Answers
NiceOne Team
NiceOne...
Admin
404 Points
67 Posts
         

Hey Rahul,

It's sound like you are building windows app store application for windows phone 8.1. In this case use HttpClient instead of WebClient. WebClient is available for Windows Phone Silverlight 8.1 apps. Windows Phone Runtime apps use Windows.Web.Http.HttpClient.

see the  following code snippet that call a json auth post api as :

public static async Task<string> AuthenticateUserAsync(string UserID, string Password) {
using (var client = new HttpClient()) {
client.BaseAddress = new Uri("https://www.exaple.com/");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage response;
// HTTP POST
response = await client.PostAsync("api/Auth", new StringContent("[\""+ UserID + "\",\"" + Password + "\"]", Encoding.UTF8, "application/json") );
if (response.IsSuccessStatusCode) {
return response.Content.ReadAsStringAsync().Result;
} else {
return response.StatusCode.ToString();
}
}
}

  

Posted On: 05-Jun-2016 05:48
Priya
Priya
Member
62 Points
26 Posts
         

I found other example that use HttpClient and uses encoding to post data.

using System;
using System.Collections.Generic;
using System.Net.Http;
class Program {
static void Main() {
using (var client = new HttpClient()) {
client.BaseAddress = new Uri("https://localhost:6740");
var content = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("", "login")
});
var result = client.PostAsync("/api/Membership/exists", content).Result;
string resultContent = result.Content.ReadAsStringAsync().Result;
Console.WriteLine(resultContent);
}
}
}

 

Posted On: 05-Jun-2016 06:01
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