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I have WCF service to store and retrieve messages (in/from a database). I'm calling it from ASP.NET.

When I run my app I face with following problem:

The remote server returned an error: (400) Bad Request.

I don't actually understand how to cope with it.
Here's the class that throws the exception:

public class SendMessageClient
    private string BASE_URL = "http://localhost:49350/Service1.svc/";
    public bool sendMessage(Message message)
            DataContractSerializer ser = new DataContractSerializer(typeof(Message));

            MemoryStream mem = new MemoryStream();
            ser.WriteObject(mem, message);
            string data = Encoding.UTF8.GetString(mem.ToArray(), 0, (int)mem.Length);
            WebClient webClient = new WebClient();
            webClient.Headers["Content-Type"] = "application/json";
            webClient.Encoding = Encoding.UTF8;
            webClient.UploadString(BASE_URL + "sendmessage", "POST", data);
            return true;
            return false;

Here's stack trace
at System.Net.HttpWebRequest.GetResponse() at System.Net.WebClient.GetWebResponse(WebRequest request) at System.Net.WebClient.DownloadBits(WebRequest request, Stream writeStream) at System.Net.WebClient.UploadBits(WebRequest request, Stream readStream, Byte[] buffer, Int32 chunkSize, Byte[] header, Byte[] footer) at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request) at System.Net.WebClient.UploadString(Uri address, String method, String data) at System.Net.WebClient.UploadString(String address, String method, String data) at MessageServiceClient.Models.SendMessageClient.sendMessage(Message message) in C:\Users\Asus\source\repos\Web service project\MessageServiceClient\Models\SendMessageClient.cs:line 27

What I have tried:

I checked my WCF Service with reqbin and it works with 200 OK inserting data to my db
Updated 12-Jul-20 22:40pm

1 solution

Given your content type is JSON, should not this
DataContractSerializer ser = new DataContractSerializer(typeof(Message));
be this
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Message));

It's the only thing that is 'obvious'
Share this answer
triyul22 13-Jul-20 5:06am    
Thank you so much!!! It is working now
triyul22 13-Jul-20 6:35am    
Sorry to ask you again, but I have a new problem:
System.BadImageFormatException: 'Could not load file or assembly 'System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Reference assemblies should not be loaded for execution. They can only be loaded in the Reflection-only loader context.
May be you can advise something
Garth J Lancaster 13-Jul-20 21:05pm    
well, without having the project in front of me and seeing if 'you' have added a reference to System.Web.Extensions, I can't think of much - I don't work with these components a lot these days, so I'd have to Google it myself. Sorry

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