Develop Reference

HttpWebRequest needs to wait 5 seconds to work properly in PUT method

I am trying to use an API and I don't have any problems with GET and POST but PUT isn't working. I tried with a lot of different examples and finally by chance I discovered that waiting more that 5 seconds (with 5000ms it is not working and with 5100ms it does) it starts working properly. But why is that happening? And how can I avoid this? 5 seconds for each registry update is to much waiting and I really don't understand why POST works well without waiting and PUT needs 5 seconds to work.
Here I put the method that I am using with the Thread.Sleep(5100). As I said without this line when I make WebResponse response = request.GetResponse(); gives me an error.
public void call(string url, object jsonObj)
{
try
{
// Create a request using a URL that can receive a post.
HttpWebRequest request = (HttpWebRequest) HttpWebRequest.Create(urlSplio);
// Create POST data and convert it to a byte array.
request.Method = "PUT";
// Set the ContentType property of the WebRequest.
request.ContentType = "application/json";
request.Credentials = new NetworkCredential(WebConfigurationManager.AppSettings["User"], "WebConfigurationManager.AppSettings["Key"]");
string json = JsonConvert.SerializeObject(jsonObj);
byte[] byteArray = Encoding.UTF8.GetBytes(json);
// 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();
Thread.Sleep(5100);
// 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.
dataStream.Close();
response.Close();
}
catch (Exception ex)
{
}
}

I think you might want to rewrite the response stream code
Take a look at this walkthrough on MS MS walkthrough
private byte[] GetURLContents(string url)
{
// The downloaded resource ends up in the variable named content.
var content = new MemoryStream();
// Initialize an HttpWebRequest for the current URL.
var webReq = (HttpWebRequest)WebRequest.Create(url);
// Send the request to the Internet resource and wait for
// the response.
// Note: you can't use HttpWebRequest.GetResponse in a Windows Store app.
using (WebResponse response = webReq.GetResponse())
{
// Get the data stream that is associated with the specified URL.
using (Stream responseStream = response.GetResponseStream())
{
// Read the bytes in responseStream and copy them to content.
responseStream.CopyTo(content);
}
}
// Return the result as a byte array.
return content.ToArray();
}

Parsing json response from httpwebresponse into listView data binding windows

I am making a http post as follows
public async Task<string> HttppostJson()
{
// Create a request using a URL that can receive a post.
HttpWebRequest request = HttpWebRequest.Create("URL") as HttpWebRequest;
// Set the Method property of the request to POST.
request.Method = "POST";
string post = "postData";
byte[] byteArray = Encoding.UTF8.GetBytes(post.ToString());
// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";
//Write data into a stream
using (var stream = await Task.Factory.FromAsync<Stream>(request.BeginGetRequestStream, request.EndGetRequestStream, null))
{
stream.Write(byteArray, 0, byteArray.Length);
}
// Pick up the response:
using (var response = (HttpWebResponse)(await Task<WebResponse>.Factory.FromAsync(request.BeginGetResponse, request.EndGetResponse, null)))
{
StreamReader reader = new StreamReader(response.GetResponseStream());
result = reader.ReadToEnd();
}
return result;
}
This gives me a JSON string as output. A small part of it is as follows
{
"id":20,
"title":"Testing after phase 2 is shifted to server",
"from":"Administrator",
"sendername":"ABX",
"day":"Tuesday",
"dateofMonth":"20th",
"month":"May",
"year":2014,
"date":"Tuesday, 20th May, 2014",
"content":"Ready. Set. Go"
}
There are 19 more such blocks refering to each "id". I want to deserialize the objects and populate them in a list view , only the "title" and "from" from all 20 notices should be seen in the listView. More id's will be added later so I want to make the listView dynamic which should include the new added id's and corresponding "title" and "from". So the listview should look like this
Title= "title"_corresponding_to_id
subtitle= "from"_correspondin_to_id
Title= "title"_corresponding_to_id
subtitle= "from"_correspondin_to_id
Title= "title"_corresponding_to_id
subtitle= "from"_correspondin_to_id
..
..
..
I am new to Windows app development. SO needed a little help.

You can make Movie class.
Then you can use newtonsoft's Json.NET library and use JObject class.
You just save json response into a string and then get values from JObject and add it to list.
string json = someJsonText
JObject response = JObject.Parse(json);
List<Movie> list = new List<Movie>();
Movie first = new Movie();
first.Title = response.GetValue("title");
list.Add(first);
And do that in foreach or for sentence to get, create and save all the movies.

Http Request not sent from android C#

Iam developing a cross platform android app in Xamarin. I want to send a request to register my device. Iam sending my DeviceId, DeviceName and EncodedAccountName i.e my email id.
But I dont get any response. I have tested the request on Postman and get a proper response.
Here is my code:
StringBuilder registerContent = new StringBuilder();
registerContent.Append("DeviceId=").Append(deviceId).Append("&");
registerContent.Append("Name=").Append(deviceName).Append("&");
registerContent.Append("EncodedAccountName‏=").Append(username);
WebRequest request = WebRequest.Create(EndPoints.RegisterDeviceEndPoint);
// Set the Method property of the request to POST.
request.Method = "POST";
// Create POST data and convert it to a byte array.
string postData = registerContent.ToString();
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();// Dont get any response here
// Display the status.
System.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.
System.Console.WriteLine(responseFromServer);
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();
return response.ToString();
Any ideas on what might me going wrong?
Thanks

This is how I notify my Web API and wait for a string response:
string myParameters = "?firstParam=" + someParam1 + "&secondParam=" + someParam2;
string url = someHTTPAddress + myParameters;
stringResponseFromWebAPI = (new WebClient()).DownloadString(url);

Retrieving Unicode Text on webrequest

I send web request with this code :
WebRequest request = WebRequest.Create(url);
// If required by the server, set the credentials.
request.Credentials = CredentialCache.DefaultCredentials;
// Get the response.
WebResponse response = request.GetResponse();
// Display the status.
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
Stream 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.
Response.Write(responseFromServer);
But I received wrong data such as &�F� ��S|�"�i�(�
what is the solution?

(OAuthException - #2500) An active access token must be used to query information about the current user

string accessToken = GetAccessToken();
string accessKey = accessToken.Split('=')[1];
var client = new FacebookClient(accessKey);
dynamic me = client.Get("me");
here is the method to get access token and it does return a valid access token
private static string GetAccessToken()
{
// Create a request using a URL that can receive a post.
WebRequest request = WebRequest.Create("https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id=201193246663533&client_secret=secretkeyhere");
// 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();
return responseFromServer;
}
However, when I debug over
dynamic me = client.Get("me");
throws this exception:
(OAuthException - #2500) An active access token must be used to query information about the current user.
How can i fix this?

you are getting access token for the APPLICATION, not for a user. Therefore, "me" does not make sense. You should supply ID there - either your user ID, or your app ID, or any other ID your app has permissions for.
both calls worked for with your example:
dynamic me = client.Get("1000<<MY_USER_ID>>5735");
dynamic theApp = client.Get("201193246663533");