How to return Json from WCF Service?

Question

I have the piece of code below of a template Ajax enabled WCF service. What can i do to make it return JSon instead of XML? thanks. ``` using System; using System.Linq; using System.Runtime.Serialization; using System.ServiceModel; using System.ServiceModel.Activation; [ServiceContract(Namespace = "WCFServiceEight")] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] public class CostService { // Add [WebGet] attribute to use HTTP GET [OperationContract] [WebGet] public double CostOfSandwiches(int quantity) { return 1.25 * quantity; } } ```

Accepted Answer

Have you tried:

```
[WebGet(ResponseFormat= WebMessageFormat.Json)]
```

How to return Json from WCF Service?

Solution

Problem