JSON parsing error WCF

Question

I am working on WCF application, I am invoking this operation

[ServiceContract]
public interface IAuditDataService
{

    [OperationContract(Name = "UserAuthentication")]
    [WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.WrappedRequest, UriTemplate = "/UserAuthentication?username={username}")]
    string UserAuthentication(string username, UserData userInfo); 

}

I am getting error

"Object Reference not set to an instance"

here

public string UserAuthentication(string username, UserData userInfo)
 {
  string outputData = string.Empty;
  return userInfo.ToString(); // << Error at this line 
 }

Here is the JSON Class

[DataContract]
[Serializable()]
public class UserData
{
    [DataMember(Name = "UserName", Order = 1)]
    public string UserName { get; set; }

    [DataMember(Name = "Password", Order = 2)]
    public string Password { get; set; }

    [DataMember(Name = "Token", Order = 3)]
    public string Token { get; set; }
}

Here is JSON request via POST method

{"UserName":"abcd",
"Password":"1234",
"Token":"1234"}

Here is response screen shot enter image description here

Any Help !

userInfo is null. Where are you getting that value from?

Sarwar Erfan
– Sarwar Erfan

2013-05-15 15:09:20 +00:00
Commented May 15, 2013 at 15:09 — Sarwar Erfan
– Sarwar Erfan, Commented May 15, 2013 at 15:09
I have edit it , Kindly check it.

Ahmed
– Ahmed

2013-05-15 15:24:25 +00:00
Commented May 15, 2013 at 15:24 — Ahmed
– Ahmed, Commented May 15, 2013 at 15:24

carlosfigueira · Accepted Answer · 2013-05-15 16:21:30Z

The BodyStyle property of your [WebInvoke] attribute specifies the style to be WrappedRequest - which means that the object which you want passed as the input must be wrapped in an object, whose member name is the same as the property name, as Steve Wilkes mentioned.

Another alternative would be to change the BodyStyle to Bare; in this case your input should work just fine. In other words, if this is your operation declaration, the input you have in your question should work.

[OperationContract(Name = "UserAuthentication")]
[WebInvoke(Method = "POST",
           ResponseFormat = WebMessageFormat.Json,
           BodyStyle = WebMessageBodyStyle.Bare,
           UriTemplate = "/UserAuthentication?username={username}")]
string UserAuthentication(string username, UserData userInfo);

Steve Wilkes · Accepted Answer · 2013-05-15 15:27:00Z

1

I have not tested this, but shouldn't you be posting:

{
    username: "abcd"
    userInfo: {
        "UserName": "abcd",
        "Password": "1234",
        "Token": "1234"
    }
}

...?

answered May 15, 2013 at 15:27

Steve Wilkes

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3 Comments

Sarwar Erfan Over a year ago

He is getting the username from request url. Check UriTemplate. So, only {userInfo:{...}} of your solution should do it.

Ahmed Over a year ago

Still having same issue. It is giving me bad request Error , which is due to "Object Reference not set to an instance"

Steve Wilkes Over a year ago

My bad on the username - thanks for pointing it out - I was too lazy to scroll :)

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