Send JSON via POST in C and Receive the JSON returned

Question

This is my first time ever using JSON as well as System Net and the WebRequest in any of my applications  My application is supposed to send a JSON payload  similar to the one below to an authentication server        agent                                       name    Agent Name                        version   1                                                                   username    Username                                         password    User Password      token    xxxxxx      To create this payload  I used the JSON NET library  How would I send this data to the authentication server and receive its JSON response back  Here is what I have seen in some examples  but no JSON content   var http    HttpWebRequest WebRequest Create new Uri baseUrl    http Accept    application json   http ContentType    application json   http Method    POST    string parsedContent    Parsed JSON Content needs to go here   ASCIIEncoding encoding   new ASCIIEncoding    Byte   bytes   encoding GetBytes parsedContent    Stream newStream   http GetRequestStream    newStream Write bytes  0  bytes Length   newStream Close     var response   http GetResponse     var stream   response GetResponseStream    var sr   new StreamReader stream   var content   sr ReadToEnd      However  this seems to be a lot of code compaired to using other languages I have used in the past  Am I doing this correctly  And how would I get the JSON response back so I can parse it   Thanks  Elite   Updated Code     Send the POST Request to the Authentication Server    Error Here string json   await Task Run      gt  JsonConvert SerializeObject createLoginPayload usernameTextBox Text  password     var httpContent   new StringContent json  Encoding UTF8   application json    using  var httpClient   new HttpClient             Error here     var httpResponse   await httpClient PostAsync  URL HERE   httpContent       if  httpResponse Content    null                   Error Here         var responseContent   await httpResponse Content ReadAsStringAsync

User · Answer

Using the JSON NET NuGet package and anonymous types  you can simplify what the other posters are suggesting           string payload   JsonConvert SerializeObject new       agent   new               name       Agent Name           version   1              username    username       password    password       token       xxxxx        var client   new HttpClient    var content   new StringContent payload  Encoding UTF8   application json     HttpResponseMessage response   await client PostAsync uri  content

User · Answer

You can build your HttpContent using the combination of JObject to avoid and JProperty and then  call ToString   on it when building the StringContent                          agent                                               name    Agent Name                                version   1                                                                                   username    Username                                                 password    User Password              token    xxxxxx                       JObject payLoad   new JObject              new JProperty  agent                    new JObject                      new JProperty  name    Agent Name                        new JProperty  version   1                                         new JProperty  username    Username                    new JProperty  password    User Password                    new JProperty  token    xxxxxx                                                 using  HttpClient client   new HttpClient                          var httpContent   new StringContent payLoad ToString    Encoding UTF8   application json                 using  HttpResponseMessage response   await client PostAsync requestUri  httpContent                                 response EnsureSuccessStatusCode                    string responseBody   await response Content ReadAsStringAsync                    return JObject Parse responseBody

User · Answer

I found myself using the HttpClient library to query RESTful APIs as the code is very straightforward and fully async ed    Edit  Adding JSON from question for clarity        agent                                       name    Agent Name                        version   1                                                                   username    Username                                         password    User Password      token    xxxxxx      With two classes representing the JSON-Structure you posted that may look like this     public class Credentials        JsonProperty  agent        public Agent Agent   get  set          JsonProperty  username        public string Username   get  set          JsonProperty  password        public string Password   get  set          JsonProperty  token        public string Token   get  set       public class Agent        JsonProperty  name        public string Name   get  set          JsonProperty  version        public int Version   get  set        you could have a method like this  which would do your POST request   var payload   new Credentials        Agent   new Agent            Name    Agent Name           Version   1             Username    Username       Password    User Password       Token    xxxxx         Serialize our concrete class into a JSON String var stringPayload   await Task Run      gt  JsonConvert SerializeObject payload        Wrap our JSON inside a StringContent which then can be used by the HttpClient class var httpContent   new StringContent stringPayload  Encoding UTF8   application json     using  var httpClient   new HttpClient              Do the actual request and await the response     var httpResponse   await httpClient PostAsync  http   localhost api path   httpContent           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

User · Answer

You can also use the PostAsJsonAsync   method available in HttpClient     x000D   x000D     var requestObj  JsonConvert SerializeObject obj   x000D     HttpResponseMessage response   await    client PostAsJsonAsync   endpoint  requestObj  ConfigureAwait false   x000D   x000D   x000D

[c#] Send JSON via POST in C# and Receive the JSON returned?

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