How do I set up a function app to extract data from media type 'application/x-www-form-urlencoded'

问题:

I have the following code in my Function App

using System.Net;  public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log) {    var data = await req.Content.ReadAsAsync<PostData>();     var sid = data.sid;     log.Info($"sid ={sid}");    return req.CreateResponse(HttpStatusCode.OK, $"Current Time : {DateTime.Now}");  }  public class PostData  {    public string sid { get; set; } } 

The error message is

No MediaTypeFormatter is available to read an object of type 'PostData' from content with media type 'application/x-www-form-urlencoded'. 

How do I set the function up to work with the correct media type?

[Update]

If I change the code to

var content = req.Content; var jsonContent = await content.ReadAsStringAsync(); log.Info(jsonContent); 

I can see the jsonContent text logged starting with

ToCountry=AU&ToState=&SmsMessageSid=SM8cac6c6a851  etc 

But I am unclear on how to go about extracting the data I need.

I tried adding

 dynamic results = JsonConvert.DeserializeObject<dynamic>(jsonContent); 

and

using Newtonsoft.Json; 

however this causes a script compilation error

[Update] Studying the sample code on the Integration Tab

Example C# code for a GitHub WebHook function

#r "Newtonsoft.Json"  using System; using System.Net; using System.Threading.Tasks; using Newtonsoft.Json;  public static async Task<object> Run(HttpRequestMessage req, TraceWriter log) {     string jsonContent = await req.Content.ReadAsStringAsync();     log.Info("Hi 1");   // does log     dynamic data = JsonConvert.DeserializeObject(jsonContent);      log.Info("Hi 2");  // does not log      return req.CreateResponse(HttpStatusCode.OK, $"Current Time : {DateTime.Now}"     }); } 

This produces an error

System.AggregateException : One or more errors occurred. ---> Unexpected character encountered while parsing value: T. Path '', line 0, position 0.    at Microsoft.Azure.WebJobs.Script.Description.DotNetFunctionInvoker.GetTaskResult(Task task) 

回答1:

For application/x-www-form-urlencoded, the body of the HTTP message sent to the server is essentially one giant query string -- name/value pairs are separated by the ampersand (&), and names are separated from values by the equals symbol (=). An example of this would be:

MyVariableOne=ValueOne&MyVariableTwo=ValueTwo 

We could get more info about application/x-www-form-urlencoded from another SO thread.

Currently, not all of the various ASP.NET WebHook receivers are handled fully yet in Functions. I also find a smilar SO Thread. Azure Functions can support 3 types of webhooks: Generic JSON,GitHub,Slack. But we could handle it with our logic. You could have a try to use the following code to get the key value in the Dictionary.

 Dictionary<string, string> myDictionary = new Dictionary<string, string>();  if (req.Content.Headers.ContentType.ToString().ToLower().Equals("application/x-www-form-urlencoded"))   {       var body = req.Content.ReadAsStringAsync().Result;       var array = body.Split('&');       foreach (var item in array)       {             var keyvalue = item.Split('=');             myDictionary.Add(keyvalue[0],keyvalue[1]);        }    }  var sid = myDictionary["SmsMessageSid"];  log.Info($"sid ={sid}");  return req.CreateResponse(HttpStatusCode.OK, $"Current Time : {DateTime.Now}");  

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