Read HttpContent in WebApi controller

Question

How can I read the contents on the PUT request in MVC webApi controller action    HttpPut  public HttpResponseMessage Put int accountId  Contact contact        var httpContent   Request Content      var asyncContent   httpContent ReadAsStringAsync   Result        I get empty string here     What I need to do is  figure out  what properties  were modified sent in the initial request  meaning that if the Contact object has 10 properties  and I want to update only 2 of them  I send and object with only two properties  something like this           FirstName   null       LastName   null       id   21     The expected end result is   List lt string gt  modified properties     FirstName    LastName

User · Accepted Answer

By design the body content in ASP NET Web API is treated as forward-only stream that can be read only once   The first read in your case is being done when Web API is binding your model  after that the Request Content will not return anything   You can remove the contact from your action parameters  get the content and deserialize it manually into object  for example with Json NET     HttpPut  public HttpResponseMessage Put int accountId        HttpContent requestContent   Request Content      string jsonContent   requestContent ReadAsStringAsync   Result      CONTACT contact   JsonConvert DeserializeObject lt CONTACT gt  jsonContent               That should do the trick  assuming that accountId is URL parameter so it will not be treated as content read

User · Answer

You can keep your CONTACT parameter with the following approach   using  var stream   new MemoryStream          var context    HttpContextBase Request Properties  MS HttpContext        context Request InputStream Seek 0  SeekOrigin Begin       context Request InputStream CopyTo stream       string requestBody   Encoding UTF8 GetString stream ToArray         Returned for me the json representation of my parameter object  so I could use it for exception handling and logging   Found as accepted answer here

User · Answer

Even though this solution might seem obvious  I just wanted to post it here so the next guy will google it faster   If you still want to have the model as a parameter in the method  you can create a DelegatingHandler to buffer the content   internal sealed class BufferizingHandler   DelegatingHandler       protected override async Task lt HttpResponseMessage gt  SendAsync HttpRequestMessage request  CancellationToken cancellationToken                await request Content LoadIntoBufferAsync            var result   await base SendAsync request  cancellationToken           return result            And add it to the global message handlers   configuration MessageHandlers Add new BufferizingHandler       This solution is based on the answer by Darrel Miller   This way all the requests will be buffered

[c#] Read HttpContent in WebApi controller

Examples related to c#

Examples related to asp.net-mvc

Examples related to asp.net-web-api

Examples related to httpcontent