Develop Reference

Asp.net Web API hangs while reading from Http Client post method (SOAP Request/Response)

Web API method is getting into a deadlock for larger response. Can someone point out where it is getting deadlock. The same code is invoked in a for loop.
Here is the code
public async Task<string> GetXMLResponse(string baseUrl, string fullFileName, int countryId, HttpClient client, FileOperations objFileOperation, string outputfilePath)
{
try
{
var fileData = new StringBuilder(objFileOperation.ReadFile(fullFileName));
var content = new StringContent(TransformToSOAPXml(fileData, countryId), Encoding.UTF8,
"application/xml");
//fileData.Clear();
//fileData.Capacity = 0;
SerilogMethods.LogCustomException(log, "Before sending to Tax Engine", "GetXMLResponse");
using (HttpResponseMessage response = await client.PostAsync(baseUrl, content))
{
// content = null;
response.EnsureSuccessStatusCode();
if (response.IsSuccessStatusCode)
{
SerilogMethods.LogCustomException(log, "Started Recieving response from Tax Engine", "GetXMLResponse");
var resultContent = await response.Content.ReadAsStreamAsync();
StreamReader readStream = new StreamReader(resultContent, Encoding.UTF8);
var postresult = await readStream.ReadToEndAsync();
XDocument doc = XDocument.Parse(postresult);
doc.Save(outputfilePath);
readStream.Dispose();
resultContent.Dispose();
//File.WriteAllText(outputfilePath, await response.Content.ReadAsStringAsync());
SerilogMethods.LogCustomException(log, "File write Completed", "GetXMLResponse");
return "Success";
}
SerilogMethods.LogCustomException(log, "Error occured in Tax Engine", "GetXMLResponse");
//Log the SOAP response when the SOAP fails with an error message
if (response.Content != null)
{
throw new Exception(await response.Content.ReadAsStringAsync());
}
return null;
}
}
catch (Exception ex)
{
SerilogMethods.LogError(log, ex, "GetXMLResponse");
return null;
}
}
If I uncomment and comment the other lines, it works with File.WriteAllText
File.WriteAllText(outputfilePath, await response.Content.ReadAsStringAsync());
Can someone point out why the second solution works and not the first one.I have to even parse the xml response before saving it

asp.net core httpclient ArgumentNullException

I'm trying to make a POST request using HttpClient but it keeps throwing an ArgumentNullException.
on this call var response = await client.PostAsync(url, content);
I've set break points and verified that the values are populated.
Is there something I'm missing that would cause this?
public async Task<bool> PostSomeObject()
{
var transaction = new CreateTransactionRequest();
transaction.MerchantAuthentication.Name = "notmyName";
transaction.MerchantAuthentication.TransactionKey = "notMyKey";
transaction.TransactionRequest.TransactionType = "authOnlyTransaction";
transaction.TransactionRequest.Amount = 5;
transaction.TransactionRequest.Payment.CardCode = "999";
transaction.TransactionRequest.Payment.CardNumber = "5424000000000015";
transaction.TransactionRequest.Payment.ExpirationMonth = 12;
transaction.TransactionRequest.Payment.ExpirationYear = 20;
var url = "xml/v1/request.api";
using (HttpClient client = new HttpClient())
{
var sampleClassObjectJson = JsonConvert.SerializeObject(transaction);
client.BaseAddress = new Uri("http://localhost:56858/");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var content = new StringContent(sampleClassObjectJson, Encoding.UTF8, "application/json");
//throws NullException on this call here
var response = await client.PostAsync(url, content);
if (response.StatusCode == HttpStatusCode.OK)
return true;
else
throw new WebException("An error has occurred while calling PostSomeObject method: " + response.Content);
}
}
Based on a comment I've added a try catch for the ArgumentNullException
try {
var response = await client.PostAsync(url, content);
}
catch (System.ArgumentNullException ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
It's not stepping into the catch statement but in the Output from debug it throws the exception.
Here is the controller action that calls my Post method
public async Task<IActionResult> PaymentInformation(Payment paymentInfo)
{
var cookie = GetCheckoutCookie();
//if there isn't a cookie ID something went wrong, redirect to Index
if (cookie.ID == null)
{
return RedirectToAction("Index");
}
var cookieSession = CheckoutSession.getCheckoutSession(cookie.ID);
if (ModelState.IsValid)
{
var status = await PostSomeObject();
}
else
{
}
return PartialView();
}

System.Net.Http.HttpClient in [Universal Windows Platform] not working properly

I wrote simple method for getting data from (online) REST Service:
public async Task<Object> GetTask()
{
try
{
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri("http://111.111.111.111:8080/");
HttpResponseMessage result = await client.GetAsync("ABC/CDE/getsomeinfo");
if (result.IsSuccessStatusCode)
{
//Deserialize
}
}
}
catch (Exception ex)
{
Debug.WriteLine("Error" + ex);
}
return null;
}
Whenever i run this on UWP i'm getting catch exception:
The text associated with this error code could not be found.
A connection with the server could not be established
HResult 2147012867
Im trying to connect my client with restapi in internal network. In forms same code is working properly.

Try this
HttpResponseMessage response;
public async Task<string> webserviceResponse(string HttpMethod)
{
// check internet connection is available or not
if (NetworkInterface.GetIsNetworkAvailable() == true)
{
// CancellationTokenSource cts = new CancellationTokenSource(2000); // 2 seconds
HttpClient client = new HttpClient();
MultipartFormDataContent mfdc = new MultipartFormDataContent();
mfdc.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data");
string GenrateUrl = "your url";
if (HttpMethod == "POST")
{
response = await client.PostAsync(GenrateUrl, mfdc);
}
else if (HttpMethod == "PUT")
{
response = await client.PutAsync(GenrateUrl, mfdc);
}
else if (HttpMethod == "GET")
{
response = await client.GetAsync(GenrateUrl);
}
var respon = await response.Content.ReadAsStringAsync();
string convert_response = respon.ToString();
return convert_response;
}
else
{
return "0";
}
}

Handling a bool Response using HttpClient windows phone

I'm developing a windows phone app that generates a QRcode, when the code is scanned, then response has to come back as true, please look at my code and advice as i'm getting a false response even thought the other app has scanned the code.
private async void queryQRCode(string code)
{
try
{
using (var client = new HttpClient())
{
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var authorisationHeader = GenerateBasicAuthorizationParameter("merchant-" + ObjUserData.MerchantId, ObjUserData.PassApiPassword); // 12ED5A5F2B38ACCBE437731BB2AC1F30 35A09A5C2AE97F055A0FDAEDA5A7093D
//Console.WriteLine ("http content - " + httpContent.ReadAsStringAsync().Result);
HttpResponseMessage httpResponse = new HttpResponseMessage();
// Do the actual request and await the response
client.DefaultRequestHeaders.Authorization = authorisationHeader;
var f = QueryCodeUrl + "/" + code + "/scanned";
httpResponse = await client.GetAsync(new Uri(f));
//httpResponse.EnsureSuccessStatusCode();
// If the response contains content we want to read it!
if (httpResponse.Content != null)
{
var responseContent = await httpResponse.Content.ReadAsStringAsync();
// From here on you could deserialize the ResponseContent back again to a concrete C# type using Json.Net
Debug.WriteLine(responseContent);
try
{
ScannedCodeResult res = JsonConvert.DeserializeObject<ScannedCodeResult>(responseContent);
Debug.WriteLine("RETURNED RESPONSE IS "+res.scanned.ToString());
if (res.scanned == false)
{
queryQRCode(code);
}
else
{
Debug.WriteLine("YAY!!!! The User has successfully scanned the application");
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message + ex.StackTrace);
}
// var qrResponse = (VcsMasterPassService.MasterPassModels.QRCodeResponse)JsonConvert.DeserializeObject (responseContent, typeof(VcsMasterPassService.MasterPassModels.QRCodeResponse));
// CreateQRCodeImage (qrResponse.code);
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message + ex.StackTrace);
}
finally
{
}
}

Above problem is caused by windows phone caching.

C# Xamarin Android Rest call in PCL error "Unexpected character encountered while parsing value: S. Path '', line 0, position 0."

I have used SO to help with several issues in the past. However, I cannot find a solution to something I have been struggling with for 2 days now.
I am a noob, please be kind :)
I have an app that I created using Xamarin Studio, targeted for Android. It is a basic GET request from a Rest Api. It was working perfectly until I realized I was not helping myself when it came time to create the same app in IOS and Windows. Once I changed my project to utilize a PCL I started getting errors, primarily around my RestClient class (originally got from http://www.codeproject.com/Tips/497123/How-to-make-REST-requests-with-Csharp)
From my droid app class:
var apiUser = GetString(Resource.String.apiUser);
var apiPass = GetString(Resource.String.apiPass);
//Get token from API
string token = authenticate(apiUser,apiPass);
public static string authenticate(string apiUser, string apiPass)
{
Authentication Auth = new Authentication ();
try
{
// set json by passing AuthenticationUrl as endpoint, returns json data
var o = JObject.Parse(EntryRepository.getJson(PJTApiUrls.getAuthenticationUrl(apiUser,apiPass)));
Auth.Token = (string)o["Token"];
return Auth.Token;
}
catch (Exception e)
{
// Couldn't do stuff. Log the exception.
// TODO possible timeout, try again, if fails again then return error message
if (e.Message.Contains("400") || e.Message.Contains("401"))
{
string error = string.Format("Invalid credentials, please try again");
return error;
} else {
string error = string.Format ("An error occurred: \r\n{0}", e.Message);
return error;
}
}
}
getAuthenticationUrl gets the api URL.
Here is getJson (in PCL):
public static string getJson(string endpoint)
{
string apiurl = endpoint;
var client = new _RestClient();
client.EndPoint = apiurl;
client.ContentType = "application/json";
client.Method = HttpVerb.GET;
//client.Method = HttpVerb.POST;
client.PostData = "";
//client.PostData = "{postData: value}";
//client.PostData = "{'someValueToPost': 'The Value being Posted'}";
var json = client._MakeRequestAsync();
// to append parameters, pass them into make request:
//var json = client.MakeRequest("?param=0");
return json.ToString();
}
And for the _RestClient class (in PCL):
public async Task<string> _MakeRequestAsync()
{
try {
var request = _MakeRequestAsync ("");
return await request;
}
catch (Exception e){
return e.Message;
}
}
public async Task<string> _MakeRequestAsync(string parameters)
{
var uri = new Uri(EndPoint + parameters);
var request = WebRequest.Create(uri) as HttpWebRequest;
using (var response = await request.GetResponseAsync () as HttpWebResponse) {
var responseValue = string.Empty;
if (response.StatusCode != HttpStatusCode.OK) {
var message = String.Format ("Request failed. Received HTTP {0}", response.StatusCode);
throw new Exception (message);
}
// grab the response
using (var responseStream = await Task.Factory.FromAsync<Stream>(request.BeginGetRequestStream, request.EndGetRequestStream, null)) {
//using (var responseStream = response.GetResponseStream ()) {
if (responseStream != null)
using (var reader = new StreamReader (responseStream)) {
responseValue = reader.ReadToEnd ();
}
}
return responseValue;
}
}
responseValue is returning null
return await request is saying "Status = Waiting for activation"
I have also had the error: "Unexpected character encountered while parsing value: S. Path '', line 0, position 0."
But this works if the RestClient class is within Droid (Instead of the shared PCL) and contains the following:
public string MakeRequest ()
{
return MakeRequest ("");
}
public string MakeRequest (string parameters)
{
var request = (HttpWebRequest)WebRequest.Create (EndPoint + parameters);
request.Method = Method.ToString ();
request.ContentLength = 0;
request.ContentType = ContentType;
if (!string.IsNullOrEmpty (PostData) && Method == HttpVerb.POST) {
var bytes = Encoding.GetEncoding ("iso-8859-1").GetBytes (PostData);
request.ContentLength = bytes.Length;
using (var writeStream = request.GetRequestStream ()) {
writeStream.Write (bytes, 0, bytes.Length);
}
}
using (var response = (HttpWebResponse)request.GetResponse ()) {
var responseValue = string.Empty;
if (response.StatusCode != HttpStatusCode.OK) {
var message = String.Format ("Request failed. Received HTTP {0}", response.StatusCode);
throw new ApplicationException (message);
}
// grab the response
using (var responseStream = response.GetResponseStream ()) {
if (responseStream != null)
using (var reader = new StreamReader (responseStream)) {
responseValue = reader.ReadToEnd ();
}
}
return responseValue;
}
}
I cannot figure this out, any help/guidance is appreciated. Let me know if I can clarify anything.
***** UPDATE ***** Thanks to #milen-pavlov help thus far, here is where I am currently at:
in Android project:
var apiUser = GetString(Resource.String.apiUser);
var apiPass = GetString(Resource.String.apiPass);
//Get token from API
var token = await authenticate(apiUser,apiPass);
lblOutput.Text = token;
calls (also in Android project):
public static async Task<string> authenticate(string apiUser, string apiPass)
{
Authentication Auth = new Authentication ();
try
{
// set json by passing AuthenticationUrl as endpoint, returns json data
var o = JObject.Parse(await EntryRepository.getJson(PJTApiUrls.getAuthenticationUrl(apiUser,apiPass)));
Auth.Token = (string)o["Token"];
return Auth.Token;
}
catch (Exception e)
{
if (e.Message.Contains("400") || e.Message.Contains("401"))
{
string error = string.Format("Invalid credentials, please try again");
return error;
} else {
string error = string.Format ("An error occurred: \r\n{0}", e.Message);
return error;
}
}
}
Calls json class in PCL project:
public static async Task<string> getJson(string endpoint)
{
string apiurl = endpoint;
var client = new _RestClient();
client.EndPoint = apiurl;
client.ContentType = "application/json";
client.Method = HttpVerb.GET;
client.PostData = "";
var json = await client._MakeRequestAsync();
return json;
}
which then calls restclient class in PCL project:
public async Task<string> _MakeRequestAsync()
{
var request = _MakeRequestAsync ("");
return await request;
}
public async Task<string> _MakeRequestAsync(string parameters)
{
var uri = new Uri(EndPoint + parameters);
using (var client = new HttpClient())
{
var response = await client.GetAsync(uri);
return await response.Content.ReadAsAsync<string>();
};
}
End result/error:
Any guidance is appreciated!

Can you use HttpClient instead?
Sample Get request will look similar to this:
public async Task<string> _MakeRequestAsync(string parameters)
{
var uri = new Uri(EndPoint + parameters);
using (var client = new HttpClient())
{
var response = await client.GetAsync(uri);
return await result.Content.ReadAsStringAsync();
};
}