Consume WCF REST in C# throws error when using List<>

Question

I'm trying to consume WCF REST services in C#. When i'm using, if the method returns array and if i type convert the code works fine. But when i tried to return as a List<> and when i tried to type convert its throwing me error.

//Client Code(Using Array):

try
            {
                string ServiceUrl = "http://localhost:58092/Service1.svc/DataService/LoadAllDatas";
                WebRequest wreq = WebRequest.Create(ServiceUrl);
                WebResponse wres = wreq.GetResponse();

                DataContractSerializer coll = new DataContractSerializer(typeof(DataServiceProxy.Product[]));


                var arrProd = coll.ReadObject(wres.GetResponseStream());

                DataServiceProxy.Product[] prd = arrProd as DataServiceProxy.Product[];
                lstProd = new List<DataServiceProxy.Product>(prd);
            }
 catch (Exception)
            {

                throw;
            }

//WCF Interface Code:

[ServiceContract]
    public interface IDataService
    {
        [OperationContract]
        [WebGet(BodyStyle=WebMessageBodyStyle.Wrapped,UriTemplate="LoadAllData")]
        IList<Product> LoadAllData();

        [OperationContract]
        [WebGet(ResponseFormat = WebMessageFormat.Xml, UriTemplate = "LoadAllDatas")]
        Product[] LoadAllDatas();

        [OperationContract]
        [WebGet(BodyStyle = WebMessageBodyStyle.Wrapped, UriTemplate = "LoadAllColumnData/{Id}")]
        IList<GdColumns> LoadAllColumnData(string Id);
    }

When i'm trying with List with the same WCF Service,

//Client Code:

 try
            {
                string Service = "http://localhost:58092/Service1.svc/DataService/LoadAllData";
                WebRequest wreq = WebRequest.Create(Service);
                WebResponse wres = wreq.GetResponse();

                DataContractSerializer coll = new DataContractSerializer(typeof(DataServiceProxy.IList<Product>));


                var arrProd = coll.ReadObject(wres.GetResponseStream());

               }

The above code throws error in the (typeof(DataServiceProxy.List<Product>)) part.

Error:

"The type or namespace 'List' does not exist in the namespace 'Web.DataServiceProxy'(are you missing an assembly reference?)"

I have tried changing the IList<> to List<> and return type of the service from array to list by Configure Service Reference still no hopes.

How can i handle this? Where i'm wrong?

Answer 1

Have made the code worked. The change should be made in the object of type and the return type in WCF. Like this,

//Code:

  string Service = "http://localhost:58092/Service1.svc/DataService/LoadAllData";
                WebRequest wreq = WebRequest.Create(Service);
                WebResponse wres = wreq.GetResponse();

                DataContractSerializer coll = new DataContractSerializer(typeof(IList<DataServiceProxy.Product>));
                //   MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(coll.));

                var arrProd = coll.ReadObject(wres.GetResponseStream());

                DataServiceProxy.Product[] prd = arrProd as DataServiceProxy.Product[];
                lstProd = new List<DataServiceProxy.Product>(prd);

//WCF:

   [OperationContract]
    [WebGet(ResponseFormat = WebMessageFormat.Xml, UriTemplate = "LoadAllData")]
    IList<Product> LoadAllData();