CODEWITHSUNDEEP
c#wcfrest
midnightCoder
midnightCoder

Reputation: 75

WCF REST Service with Generic Collection

I am attempting to build a Restful WCF Service. In my WCF Service I am referencing 1 dll which contains the Data Access Layer.

I have the following method in my WCF class

public class Search : ISearch
{

    public List<Product> GetProductList()
    {
        ProductDA dataAccess = new ProductDA();
        List<Product> obj = new List<Product>();
        obj = dataAccess.GetProducts();
        return obj;
    }

}

My interface holds the OPerationContract as follows:

[ServiceContract]
public interface ISearch
{
    [OperationContract]
    [WebGet(UriTemplate = "getProductList",  RequestFormat = WebMessageFormat.Xml, ResponseFormat WebMessageFormat.Xml)]
    List<Product> GetProductList();
}

When I run the url http://localhost:36741/RestService/Search.svc/getFoodTruckNameList in the browser I receive the following error: The server encountered an error processing the request

Does anyone know the correct code to call the [OperationContract] for List<Product> GetProductList(); ?

Thanks in advance. Been pulling my hair out on this one for a while..

Upvotes: 2

Views: 1563

Answers (2)

M.Babcock
M.Babcock

Reputation: 18965

Looking at my RESTful web services that do something like this, I typically do something closer to:

[CollectionDataContract]
public class Products : List<Product> 
{
    public Products(IEnumerable<Product> products) : base(products) { }
}

Then your interface would be like:

[ServiceContract]
public interface ISearch
{
    [OperationContract]
    [WebGet(UriTemplate = "getProductList",  RequestFormat = WebMessageFormat.Xml, ResponseFormat WebMessageFormat.Xml)]
    Products GetProductList();
}

And then your service contract would look like:

public class Search : ISearch
{
    public Products GetProductList()
    {
        return new Products(new ProductDA().GetProducts());
    }
}

Upvotes: 3

Shiraz Bhaiji
Shiraz Bhaiji

Reputation: 65371

We have often had problems returning a Generic list as the response to a WCF service.

The simple way to solve it is to create a class which has a single property which is the Generic list, and then return this class.

[DataContract]
public class Class1
{
    [DataMember]
    public List<Foo> Foos { get; set; }
}

Upvotes: 0

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