Using JSON as a parameter for WCF Restservice Method

Question

I hope you can help, im trying to upgrade a broken login system so it uses POST instead of GET when transffering login credentials.

It never reaches the actual method so the problem is somewhere between the interface and my javascript.

Interface:

[OperationContract]
        [WebInvoke(Method = "POST", 
            BodyStyle = WebMessageBodyStyle.WrappedRequest,
            ResponseFormat = WebMessageFormat.Json,
            RequestFormat = WebMessageFormat.Json, 
            UriTemplate = "/DoLogin")]
        LoginKey DoLogin(string email, string password,string tenant);

Javascript:

 $.ajax({
            type: "POST",
            url: "RestService.svc/DoLogin",
            data:'{"email":"' + encodeURIComponent(email) + '","password":"' + encodeURIComponent(password) + '","tenant":"' + encodeURIComponent(tenant) + '"}',
            dataType: "json",
            cache: false,
            success: function (loginKey) {
... rest of method

The JSON data i send is valid: { "email": "mail", "password": "somepassword", "tenant": "tenantid" } Any ideas whats going wrong here? It worked just fine with GET

ps here is the first line of the actual login rest service method:

public LoginKey DoLogin(string email, string password, string tenant)
        {

Can you post the error you're getting?

Ash Eldritch
– Ash Eldritch

2011-08-08 15:44:16 +00:00
Commented Aug 8, 2011 at 15:44 — Ash Eldritch
– Ash Eldritch, Commented Aug 8, 2011 at 15:44
Also, please post your WCF service configuration.

Drew Marsh
– Drew Marsh

2011-08-08 16:03:57 +00:00
Commented Aug 8, 2011 at 16:03 — Drew Marsh
– Drew Marsh, Commented Aug 8, 2011 at 16:03

Icarus · Accepted Answer · 2011-08-08 17:31:40Z

Try setting the content type also, just in case:

type: "POST",
url: "RestService.svc/DoLogin", data:'{"email":"' + encodeURIComponent(email) + '","password":"' + dataType: "json",
"contentType": "application/json; charset=utf-8", ...

Other than that, your code looks correct although I would prefer a different approach:

public class Credential
{
  public string Email{get;set;}
  public string Password {get;set;}
  public string Tenant {get;set;}
}

And in your WCF Method:

public LoginKey DoLogin(Credential theCredential)

And in your markup:

var theCreadential = new Object();
theCreadential.Email = $('#txtEmail').val();
theCreadential.Password = $('#txtPassword').val();
theCreadential.Tenant = $('#txtTenant').val();
 $.ajax({
            type: "POST",
            url: "RestService.svc/DoLogin",
            data: "{'theCredential': " + JSON.stringify(theCredential) + "}",
            dataType: "json",
            cache: false,
            success: function (loginKey) {
... rest of method

thx, ContentType did the trick. A better JSON object "prettied" it up though :)

mfriis · Accepted Answer · 2011-08-09 10:36:05Z

I decided to drop the whole restservice and instead migrate the project over to MVC3 which handles these scenarios a lot simpler and easier.

The issue was solved by adding a contentType to the ajax call btw:

 $.ajax({
            type: "POST",
            url: "restservice.svc/dologin",
            data: JSON.stringify(json),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            cache: false,
            success: function (result) {

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