Develop Reference

Webclient doesnt like UrlEncoded slash. How to make it work?

I'm trying to pass an URL to an API using a .net 2.0 webclient (unable to upgrade). The webclient call only works if there are no slashes in the encoded value. Any idea why it is failing and how to make it work?
using System.Net;
using System.Text;
using System.Web;
namespace ConsoleAppWebClient
{
class Program
{
static void Main(string[] args)
{
using (var client = new WebClient())
{
client.Encoding = Encoding.UTF8;
client.Headers[HttpRequestHeader.Accept] = "application/xml";
var requestUrl = HttpUtility.UrlEncode("https://www.somewebsite.com");
var stringResult = client.DownloadString("https://localhost:12345/api/getstuff/" + requestUrl);
}
}
}
}
The above doesnt work but the below works just fine
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Xml.Serialization;
using System.Web;
namespace ConsoleAppWebClient
{
class Program
{
static void Main(string[] args)
{
using (var client = new WebClient())
{
client.Encoding = Encoding.UTF8;
client.Headers[HttpRequestHeader.Accept] = "application/xml";
var requestUrl = HttpUtility.UrlEncode("https:www.somewebsite.com");
var stringResult = client.DownloadString("https://localhost:12345/api/getstuff/" + requestUrl);
}
}
}
}

It looks like requestUrl is meant to be a query parameter, but you're adding it to the URL's path.
The result is
https://localhost:12345/api/getstuff/https%3A%2F%2Fwww.somewebsite.com
"%" is an unsafe character which can lead to unpredictable results.
Instead, try making it a querystring parameter:
var requestUrl = HttpUtility.UrlEncode("https:www.somewebsite.com");
var stringResult = client.DownloadString(
"https://localhost:12345/api/getstuff/?requestUrl=" + requestUrl);
Now that the URL-encoded parameter is in the querystring instead of the path it should be okay.

Authorisation Header and Content Type in C#

I am writing a code in C# to build the console to implement get request.
We were using POSTMAN to achieve the task but we decided to build our own.
I need to pass the user name and pw in headers of the request.
Since i am new to programming,can you guide me.
I have written below code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
namespace ConsoleApp2
{
class Program
{
private static object response;
static void Main(string[] args)
{
GetRequest("https://www.google.com");
Console.ReadKey();
}
async static void GetRequest(string url)
{
using (HttpClient client = new HttpClient())
{
using (HttpResponseMessage response = await client.GetAsync(url))
{
using (HttpContent content = response.Content)
{
string mycontent = await content.ReadAsStringAsync();
Console.WriteLine(mycontent);
}
}
}
}
}
}

You can try following code snippet
HttpClient client = new HttpClient()
var byteArray = Encoding.ASCII.GetBytes("username:password1234");
client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));

DefaultRequestHeaders is not working, I have used below snippet for authentication
string _ContentType = "application/json";
httpWebRequest.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(_ContentType));
var _CredentialBase64 = "xxxxxxxxx=";
httpWebRequest.DefaultRequestHeaders.Add("Authorization", String.Format("Basic {0}", _CredentialBase64));

No response from web api

Attempting to post to api.lob.com using HTTPClient. During debug intellisense shows a value in the HTTPRequestMessage, however, the task httpresponsemessage value shows nothing at all.
Built the code based on this post click here
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Http.Formatting;
namespace HTTPClientAPICall
{
class Program
{
static void Main(string[] args)
{
callAPI();
}
static void callAPI()
{
HttpClient client = new HttpClient();
client.BaseAddress = new Uri("https://api.lob.com");
client.DefaultRequestHeaders
.Accept
.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.Authorization = new
AuthenticationHeaderValue("Basic",
Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", "test_xxxxxxxxxxxxxxxxxxxxxxxxxx", ""))));
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "/v1/verify");
request.Content = new StringContent("{\"address_line1\":\"1600 Pennsylvania Ave NW\",\"address_city\":\"Washington\",\"address_state\":\"DC\",\"address_zip\":\"20500\"}", Encoding.UTF8, "application/json");
client.SendAsync(request).ContinueWith
((responseTask) =>
{
Console.WriteLine("Response: {0}", responseTask.Result);
});
}
}
}
Intellisense
vs.
I have looked at using RESTSharp but would prefer to use straight C# without the extra references.

Made several mistakes in the original code. This solution is working. Used this post to identify the starting point for the ultimate solution: click here
The key to the solution was JSON.NET.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Web.Configuration;
using Newtonsoft.Json;
namespace JSONandHTTPClient
{
class Program
{
static void Main(string[] args)
{
callJSONandHTTPClientApp();
}
static void callJSONandHTTPClientApp()
{
using (var client = new HttpClient())
{
var parameters = new Dictionary<string, string>();
parameters["address_line1"] = "1600 Pennsylvania Ave NW";
parameters["address_city"] = "Washington";
parameters["address_state"] = "DC";
parameters["address_zip"] = "20050";
client.BaseAddress = new Uri("https://api.lob.com");
client.DefaultRequestHeaders
.Accept
.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", "test_xxxxxxxxxxxxxxxxxxxxxxxxxxxxx", ""))));
var justJSON = JsonConvert.SerializeObject(parameters).ToString();
var value = new StringContent(justJSON, Encoding.UTF8, "application/json");
var response = client.PostAsync("v1/verify", value).Result;
if (response.IsSuccessStatusCode)
{
dynamic content = JsonConvert.DeserializeObject(
response.Content.ReadAsStringAsync()
.Result);
Console.WriteLine(content.ToString());
}
Console.ReadLine();
}
}
}
}

c# changing this line so it outputs the string as a variable

UPDATE TO POST ORIGIANAL POST AFTER THIS CODE --- this code is an update to what david has been helping me do its throwing one error need help
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.Specialized;
using System.Net;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
string URL = "http://localhost/test2.php";
WebClient webClient = new WebClient();
NameValueCollection formData = new NameValueCollection();
formData["var1"] = formData["var1"] = string.Format("MachineName: {0}", System.Environment.MachineName);
formData["var2"] = ip();
byte[] responseBytes = webClient.UploadValues(URL, "POST", formData);
string responsefromserver = Encoding.UTF8.GetString(responseBytes);
Console.WriteLine(responsefromserver);
webClient.Dispose();
System.Threading.Thread.Sleep(5000);
}
public void ip()
{
String publicIP = "";
System.Net.WebRequest request = System.Net.WebRequest.Create("http://checkip.dyndns.org/");
using (System.Net.WebResponse response = request.GetResponse())
{
using (System.IO.StreamReader stream = new System.IO.StreamReader(response.GetResponseStream()))
{
publicIP = stream.ReadToEnd();
}
}
//Search for the ip in the html
int first = publicIP.IndexOf("Address: ") + 9;
int last = publicIP.LastIndexOf("</body>");
publicIP = publicIP.Substring(first, last - first);
Console.WriteLine(publicIP);
System.Threading.Thread.Sleep(5000);
}
}
}
this is the error I am getting
Error 2 - An object reference is required for the non-static field, method, or property 'ConsoleApplication1.Program.ip()'
I am trying to create a function that will send the out put as var2
I have this c# script
using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("MachineName: {0}", System.Environment.MachineName);
System.Threading.Thread.Sleep(5000);
}
}
}
how can I change this so it outputs the string to a variable say "VAR2" and use it in this script
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.Specialized;
using System.Net;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
string URL = "http://localhost/test2.php";
WebClient webClient = new WebClient();
NameValueCollection formData = new NameValueCollection();
formData["var1"] = "THIS IS WHERE VAR2 NEEDS TO BE ";
byte[] responseBytes = webClient.UploadValues(URL, "POST", formData);
string responsefromserver = Encoding.UTF8.GetString(responseBytes);
Console.WriteLine(responsefromserver);
webClient.Dispose();
System.Threading.Thread.Sleep(5000);
}
}
}
SO HOW CAN I ADD THE MACHINE NAME SCRIPT TO THIS FUNCTION AND THEN USE IT AS VAR2
any help would be brilliant
using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication5
{
class Program
{
public static int Main(string[] args)
{
String publicIP = "";
System.Net.WebRequest request = System.Net.WebRequest.Create("http://checkip.dyndns.org/");
using (System.Net.WebResponse response = request.GetResponse())
{
using (System.IO.StreamReader stream = new System.IO.StreamReader(response.GetResponseStream()))
{
publicIP = stream.ReadToEnd();
}
}
//Search for the ip in the html
int first = publicIP.IndexOf("Address: ") + 9;
int last = publicIP.LastIndexOf("</body>");
publicIP = publicIP.Substring(first, last - first);
Console.WriteLine(publicIP);
System.Threading.Thread.Sleep(5000);
return 0;
}
}
}
her is the update david I would like to incude this script in my other script so it looks like this
formData["var1"] = formData["var1"] = string.Format("MachineName: {0}", System.Environment.MachineName);
formData["var2"] = "this is where this script needs to be ";

Why does it need to be in a separate application? If one application's output is going to be the command-line argument for another application's input, then they're both running on the same machine. Which means, in this case, they'd both get the same value from System.Environment.MachineName.
You can just get the value in the application where it's needed:
formData["var1"] = string.Format("MachineName: {0}", System.Environment.MachineName);

Unable to post data through HttpClient PostAsync

I am using HttpClient to send the data to the server through C# console application using post .
The HttpClient PostAsync is unable to post the data I have tried to send in various format
i.e string content , binary content , stream content , http content through Dictionary object but the post is null and the server is returning the request invalid exception below is my code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using System.Windows;
using System.Windows.Input;
using System.IO;
using System.Web;
namespace ConsoleApplication1
{
class Program
{
string str = ""; int j = 0;
static void Main(string[] args)
{
Program df = new Program();
df.Started();
}
public async void Started()
{
string contentLength="0";
try
{
contentLength = await AccessTheWebAsync();
}
catch (Exception e)
{
}
Console.WriteLine(contentLength);
}
async Task<string> AccessTheWebAsync()
{
HttpClient client = new HttpClient();
string token = "qwerty1234";
string test = "1";
string postrequest = "<?xml version='1.0' encoding='UTF-8'?>" +
"<request> " +
"<rec>asdf1234</rec> " +
" <lid>9876</lid> " +
"</request> ";
Dictionary<string, string> dict = new Dictionary<string, string>();
dict.Add("token", token);
dict.Add("test", test);
dict.Add("request", postrequest);
HttpContent content = new FormUrlEncodedContent(dict);
Uri url = new Uri("http://example.com/");
Task<HttpResponseMessage> getStringTask = client.PostAsync(url, content);
HttpResponseMessage httpmesssage = await getStringTask;
Stream respons = await httpmesssage.Content.ReadAsStreamAsync();
StreamReader sr = new StreamReader(respons);
string response = sr.ReadToEnd();
return response;
}
}
}
thanks in advance

In a Console application, you need to wait for the operation to complete, either using Task.Wait, Console.ReadKey, or similar. Also, avoid async void:
static void Main(string[] args)
{
Program df = new Program();
df.StartedAsync().Wait();
}
public async Task StartedAsync()