Wednesday, October 10, 2012

populate a DropDownList in ASP.Net MVC2 from wcf client service


First we see how to pull data from wcf client into our mvc, (here i am not giving the example of how to create wcf and publish the service, i hope you are already familier with that process)

we create an interface that will consume the wcf client.
 public interface IClientService
    {
 List GetProducETGProducts();
}

public class ClientService : BaseModel, IClientService
    {
        private readonly ICustomerService _provider;

        public ClientService()
            : this(null)
        {

        }

        public ClientService(CustomerServiceClient provider)
        {
            _provider = provider ?? new CustomerServiceClient();
// this service client is WCF service client.

        }

// finally database / wcf call done here.

 public List GetProducETGProducts()
        {
            List custs = null;
            tbProductMaster[] custArry = _provider.GetProductMaster();

            custs = custArry.ToList();

            return custs;
        }

}

Now we create a controller class that will fetch data from client service we have just create in above example

[HandleError]
    public class ClientController : Controller
    {


// this interface has all defination    
public IClientService ClientService { get; set; }

        protected override void Initialize(RequestContext requestContext)
        {
             if (ClientService == null) { ClientService = new ClientService(); }

            base.Initialize(requestContext);
        }

// here now we load data into model from our data access layer, in this example we are using a WCF service to pull data from data source, so i am not putting to code of wcf call, you can use any data access to pull data from datasource

public ActionResult ManageClients()
        {
            ViewData["Message"] = "Manage Clients!";

            var model = new ClientViewModel();
            model.ProductMaster = ClientService.GetProducETGProducts();

            return View(model);
        }
}


Lets take a look at how the model will look like, we have already used in above ManageClients() method, and this same model we will be using to create a view (.aspx / .ascx ) pages

public class ClientViewModel : BaseModel
    {
        public  List< tbContact> Clients { get; set; }
        public List< tbProductMaster> ProductMaster { get; set; }

    }


Finally, now this is how your html .aspx page page will look like

<% @ Page Title="Manage Clients" Language="C#" MasterPageFile="~/Views/Shared/Site.Master"
    Inherits="System.Web.Mvc.ViewPage"  %>

< asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

 <%: Html.DropDownList("ProductMaster", new SelectList(Model.ProductMaster, "ProductId", "Product")) %>
</ asp:Content>

You are done! simply run the page, you should be able to see the dropdown list, make sure you have set the property name properly.

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