I am new for xamrin forms, now i want to access wcf service in xamarin froms`WebRequest request = WebRequest.Create(uri);
request.Method = "POST";
request.ContentType = "text/plain; charset=utf-8";
string json = JsonConvert.SerializeObject(ObjInput);
using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
{
writer.Write(json);
}
HttpWebResponse responce = (HttpWebResponse)request.GetResponse();
Stream reader = responce.GetResponseStream();
StreamReader sReader = new StreamReader(reader);
string outResult = sReader.ReadToEnd();
return outResult;` am using this code but getting error in Getresponse stream.
Thanks in advance..
Official xamarin walkthrough: Walkthrough - Working with WCF
Official xamarin walkthrough to consume WFC: Consuming a Windows Communication Foundation (WCF) Web Service
Official xamarin sample from walkthrough: WCF Walkthrough Sample
Related
I need to create an ASP.NET Core 3 Web API that understand this URL
http://myapp.com/MyASPNetCore3WebApi/myController/myWebMethod?user=A0001
and one zipfile which goes as a content. This is the code that calls the needed API, which I need to create:
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(URI);
httpWebRequest.Timeout = -1;
httpWebRequest.KeepAlive = false;
httpWebRequest.Method = "POST";
httpWebRequest.ProtocolVersion = HttpVersion.Version10;
httpWebRequest.ContentType = "application/octet-stream";
httpWebRequest.Accept = "application/octet-stream";
httpWebRequest.ContentLength = data.Length;
Stream requestStream = httpWebRequest.GetRequestStream();
requestStream.Write(data, 0, data.Length);
requestStream.Close();
HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
The code above is working fine, it is used everyday, sending data to a java web service, now I am replacing that system for a new one in ASP.NET Core and I can't change the caller's code, that's why I need to create a Web API that understand that URL.
I have wrote this code in my Web API, but I guess I am missing something that I can´t figure it out because I get an error ion the client (code above)
[HttpPost("myWebMethod")]
public FileStreamResult myWebMethod(string user, [FromBody] Stream compress)
{
byte[] zip = ((MemoryStream)compress).ToArray();
byte[] data = ZipHelper.Uncompress(zip);
.....................
}
The error I get in the client is this:-
[System.Net.WebException] {"The remote server returned an error: (415)
Unsupported Media Type."} System.Net.WebException
Thanks in advance for any help
If the goal is to read the raw request content, this can be done using HttpContext controller property. HttpContext has Request property that provides access to the actual HTTP request.
No additional model properties or controller arguments are needed to access raw request stream. It's important to note that FromBody and FromForm binding should not be used in this case.
There are couple notes regarding the code in the example from the original question.
byte[] zip = ((MemoryStream)compress).ToArray();
byte[] data = ZipHelper.Uncompress(zip);
The HttpContext.Request.Body property does not return MemoryStream, it returns its own implementation of a Stream. It means that there is no ToArray method.
When reading the entire content of a request directly into the server's memory, it is better to check the content length, otherwise the client can crash the server by sending a large enough request.
Using *Async methods when reading the content of the request will improve performance.
I am developing simple Http client to consume an Asp.Net Core Web API. I want to pass few http header values to the Web API via HttpHeaderCollection. In previous versions of .Net framework allowed to add header values to the HttpHeaderCollection as following
WebHeaderCollection aPIHeaderValues = new WebHeaderCollection();
aPIHeaderValues .Add("UserName","somevalue");
aPIHeaderValues .Add("TokenValue", "somevalue");
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Headers.add(aPIHeaderValues);
HttpWebResponse response = (HttpWebResponse)_request.GetResponse();
But in .Net Core there is no way to add headers to request.Headers collection. As well as we cannot add headers by defining new WebHeaderCollection
WebHeaderCollection aPIHeaderValues = new WebHeaderCollection();
Is there any alternative way to do this in .Net Core
The question is about HttpWebRequest, which is different than HttpClient.
Using HttpWebRequest, you simply assign to a header you want like this:
request.Headers["HeaderToken"] = "HeaderValue";
.NET core will create the header if it does not exist.
Here is an example:
SampleClass sampleClass= null;
using (HttpClient client = new HttpClient()){
client.DefaultRequestHeaders.Add("Authorization", "TOKEN");
var data = await client.GetAsync("MY_API_URL");
var jsonResponse = await data.Content.ReadAsStringAsync();
if (jsonResponse != null)
sampleClass= JsonConvert.DeserializeObject<SampleClass>(jsonResponse);
return sampleClass;
}
I am trying to consume SharePoint 2013 REST services from a Desktop application ( cross-platform, cross-os ). Application is basically a HTML page in application view.
Is there a simple way I can authenticate my calls using HTTP methods ?
Yes, you can get authenticated and receive a digest via a REST call.
string url = "http://Your.SP.Site";
HttpClient client = new HttpClient(new HttpClientHandler() { UseDefaultCredentials = true });
client.BaseAddress = new System.Uri(url);
string cmd = "_api/contextinfo";
client.DefaultRequestHeaders.Add("Accept", "application/json;odata=verbose");
client.DefaultRequestHeaders.Add("ContentType", "application/json");
client.DefaultRequestHeaders.Add("ContentLength", "0");
StringContent httpContent = new StringContent("");
var response = client.PostAsync(cmd, httpContent).Result;
if (response.IsSuccessStatusCode)
{
string content = response.Content.ReadAsStringAsync().Result;
JsonObject val = JsonValue.Parse(content).GetObject();
JsonObject d = val.GetNamedObject("d");
JsonObject wi = d.GetNamedObject("GetContextWebInformation");
retVal = wi.GetNamedString("FormDigestValue");
}
The above example shows how to retrieve the digest in C# with the HttpClient. This string needs to be passed as a header to all of the other rest calls you make to carry forward the authentication. You can create a credential by passing in a username and password if needed.
I have more examples here:
https://arcandotnet.wordpress.com/2015/04/01/sharepoint-2013-rest-services-using-c-and-the-httpclient-for-windows-store-apps/
You can do these calls in JavaScript as well and Microsoft has a lot of documentation on that. There is also .NET library, Microsoft.SharePoint.Client.DLL (CSOM) that simplifies this type of coding but you must have the library installed on the client.
I want to know how can I consume OpenShift Rest API into C#.net based application. I have gone through URL
https://access.redhat.com/documentation/en-US/OpenShift_Online/2.0/pdf/REST_API_Guide/OpenShift_Online-2.0-REST_API_Guide-en-US.pdf, in this there mentioned example for Ruby, Python and cRUL. but not mentioned for .Net. so I have created sample application for consuming this api.
below is the code -
string URL = "https://openshift.redhat.com/broker/rest/api";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
request.Method = "GET";
request.ContentType = "application/xml;";
try
{
WebResponse webResponse = request.GetResponse();
Stream webStream = webResponse.GetResponseStream();
StreamReader responseReader = new StreamReader(webStream);
string response = responseReader.ReadToEnd();
Console.Out.WriteLine(response);
responseReader.Close();
}
catch (Exception e)
{
Console.Out.WriteLine("-----------------");
Console.Out.WriteLine(e.Message);
}
While executing above code I am getting following error -
"The remote server returned an error: (406) Not Acceptable."
Please let me where I am doing wrong.
Thanks in advance
Jyoti
You are using the wrong HTTP header. ContentType is used for POST/PUT operations to tell server what to expect. When you GET a resource you must specify an Accept header.
request.Accept = "application/xml";
I am stumped on this problem and have come humbled to the experts on advice for my problem.
I have an ASP.NET MVC app that is Siteminder enabled. In addition, this app has a section of URLS that are web services which provide data to another application. Those URLS have been configured for "bypass" Siteminder authentication in the Siteminder setup. I've double checked the bypass to make sure the Siteminder configuration is correct. I can enter those URLs in a browser and the JSON data is displayed "without" Siteminder authentication. However....
The problem is when I use HttpWebResponse, Stream and StreamReader to retrieve the JSON data when siteminder is enabled, I get the Siteminder "login page HTML" as the string when StreamReader.ReadToEnd() is evoked instead of the JSON formatted data???
This is baffling because I another developer here can access the same web service and get the "correct" JSON formatted data in a PYTHON app. Also, I put it in a regular ASP.NET app so it's not an MVC issue. I get the same result.
Is there another class or library I should use? Is there a configuration setting I need to pass to the web service call? Any help would be greatly appreciated.
Here is the code of one of the web service calls.
public static string GetData()
{
string host = (string)System.Configuration.ConfigurationManager.AppSettings["WEBSERVICE_GET"];
string URL = host + "Api/GetData";
var end = string.Empty;
try
{
HttpWebRequest request = WebRequest.Create(URL) as HttpWebRequest;
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
using (Stream responseStream = response.GetResponseStream())
{
if (response.StatusCode != HttpStatusCode.OK && response.StatusCode != HttpStatusCode.Created)
{
throw new HttpException((int)response.StatusCode, response.StatusDescription);
}
using (StreamReader reader = new StreamReader(responseStream))
{
end = reader.ReadToEnd();
reader.Close();
}
responseStream.Close();
response.Close();
}
}
catch (Exception ex)
{
EmailNotification.SendErrorEmail("Could not get Data from WEBSERVICE + ex);
}
return end;
}