How to get POST data in WebAPI

Question

I m sending a request to server in the following form   http   localhost 12345 api controller par1 par2   The request is correctly resolved to a method like    HttpPost  public void object Post string par1  string par2    However  I pass additional data through the request content  How can I retrieve these data   For the sake of example  let s say  that the request is sent from the form    lt form action  http   localhost 12345 api controller par1 par2  method  post  gt       lt input type  hidden  name  data  value  value    gt       lt input type  submit  name  submit  value  Submit    gt   lt  form gt

User · Answer

I found for my use case this was much more useful  hopefully it helps someone else that spent time on this answer applying it  public IDictionary lt string  object gt  GetBodyPropsList                         var contentType   Request Content Headers ContentType MediaType              var requestParams   Request Content ReadAsStringAsync   Result               if  contentType     application json                                 return Newtonsoft Json JsonConvert DeserializeObject lt IDictionary lt string  object gt  gt  requestParams                             throw new HttpResponseException HttpStatusCode UnsupportedMediaType

User · Answer

I had a problem with sending a request with multiple parameters   I ve solved it by sending a class  with the old parameters as properties    lt form action  http   localhost 12345 api controller method  method  post  gt       lt input type  hidden  name  name1  value  value1    gt       lt input type  hidden  name  name2  value  value2    gt       lt input type  submit  name  submit  value  Submit    gt   lt  form gt    Model class   public class Model       public string Name1   get  set        public string Name2   get  set        Controller   public void method Model m        string name   m Name1

User · Answer

Is there a way to handle form post data in a Web Api controller    The normal approach in ASP NET Web API is to represent the form as a model so the media type formatter deserializes it  Alternative is to define the actions s parameter as NameValueCollection   public void Post NameValueCollection formData      var value   formData  key

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From answer in this question  How to get Json Post Values with asp net webapi   Autoparse using parameter binding  note that the dynamic is made up of JToken  hence the  Value accessor   public void Post  FromBody dynamic value        var x   value var1 Value     JToken    Read just like Request RequestUri ParseQueryString   key   public async Task Post                dynamic obj   await Request Content ReadAsAsync lt JObject gt        var y   obj var1     Same as  2  just not asynchronously     so you can use it in a helper method  private T GetPostParam lt T gt  string key        var p   Request Content ReadAsAsync lt JObject gt         return  T Convert ChangeType p Result key   typeof T       example conversion  could be null         Caveat -- expects media-type application json in order to trigger JsonMediaTypeFormatter handling

User · Answer

After spending a good bit of time today trying to wrap my brain around the  significant but powerful  paradigm shift between old ways of processing web form data and how it is done with WebAPI  I thought I d add my 2 cents to this discussion   What I wanted to do  which is pretty common for web form processing of a POST  is to be able to grab any of the form values I want  in any order   Say like you can do if you have your data in a System Collections Specialized NameValueCollection  But turns out  in WebAPI  the data from a POST comes back at you as a stream  So you can t directly do that   But there is a cool little class named FormDataCollection  in System Net Http Formatting  and what it will let you do is iterate through your collection once   So I wrote a simple utility method that will run through the FormDataCollection once and stick all the values into a NameValueCollection  Once this is done  you can jump all around the data to your hearts content   So in my ApiController derived class  I have a post method like this       public void Post FormDataCollection formData                NameValueCollection valueMap   WebAPIUtils Convert formData                my code that uses the data in the NameValueCollection         The Convert method in my static WebAPIUtils class looks like this            lt summary gt          Copy the values contained in the given FormDataCollection into          a NameValueCollection instance           lt  summary gt           lt param name  formDataCollection  gt The FormDataCollection instance   required  but can be empty  lt  param gt           lt returns gt The NameValueCollection  Never returned null  but may be empty  lt  returns gt      public static NameValueCollection Convert FormDataCollection formDataCollection                Validate IsNotNull  formDataCollection   formDataCollection            IEnumerator lt KeyValuePair lt string  string gt  gt  pairs   formDataCollection GetEnumerator             NameValueCollection collection   new NameValueCollection             while  pairs MoveNext                          KeyValuePair lt string  string gt  pair   pairs Current               collection Add pair Key  pair Value                      return collection           Hope this helps

User · Answer

It is hard to handle multiple parameters on the action directly  The better way to do it is to create a view model class  Then you have a single parameter but the parameter contains multiple data properties   public class MyParameters       public string a   get  set         public string b   get  set       public MyController   ApiController       public HttpResponseMessage Get  FromUri  MyParameters parameters              Then you go to   http   localhost 12345 api MyController a par1 amp b par2   Reference  http   www asp net web-api overview formats-and-model-binding parameter-binding-in-aspnet-web-api  If you want to use   par1 par2   you can register an asp routing rule  eg routeTemplate   API  controller   action   a   b     See http   www asp net web-api overview web-api-routing-and-actions routing-in-aspnet-web-api

User · Answer

Try this   public string Post FormDataCollection form        string par1   form Get  par1                    It works for me with webapi 2

User · Answer

None of the answers here worked for me   Using FormDataCollection in the post method seems like the right answer but something about my post request was causing webapi to choke   eventually I made it work by including no parameters in the method call and just manually parsing out the form parameters like this   public HttpResponseMessage FileUpload         System Web HttpRequest httpRequest   System Web HttpContext Current Request      System Collections Specialized NameValueCollection formData   httpRequest Form      int ID   Convert ToInt32 formData  ID         etc

[asp.net] How to get POST data in WebAPI?

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