C# 4 and .NET 4

890 ❘ ChaPTer 32 dAtA services
{
class Program
{
static void Main()
{
DataServiceHost host = new DataServiceHost(typeof(MenuDataService),
new Uri[] { new Uri("http://localhost:9000/Samples ") });
host.Open();
Console.WriteLine("service running");
Console.WriteLine("Press return to exit");
Console.ReadLine();
}
}
}
host.Close();
code snippet DataServicesHost/Program.cs
Now you can start the executable and request the service with the links http://localhost:9000/Samples/
Menus and http://localhost:9000/Samples/Categories from within Internet Explorer. To use Internet
Explorer to see the data returned from the service, you need to deselect the option “Turn on feed reading view.”
To start a listener without elevated administrator rights, you need to confi gure the
ACL for the port and the user with netsh http add urlacl url=http://+:9000/
Samples user=username listen=yes. Of course to change these administrative settings,
elevated administrator rights are required.
additional service operations
Instead of offering just the properties from the data model, you can add additional service operations
to the data service. In the sample code, you can see the method GetMenusByName() , which gets a
request parameter from the client and returns all menus starting with the requested string with an
IQueryable < Menu > collection. Such operations need to be added to the service operation access rules in the
InitalizeService() method in case you do not offer all service operations using the * .
public class MenuDataService : DataService < MenuCardDataModel >
{
public static void InitializeService(DataServiceConfiguration config)
{
config.SetEntitySetAccessRule("Menus", EntitySetRights.All);
config.SetEntitySetAccessRule("Categories", EntitySetRights.All);
config.SetServiceOperationAccessRule("GetMenusByName",
ServiceOperationRights.All);
}
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
}
[WebGet(UriTemplate="GetMenusByNamename={name}",
BodyStyle=WebMessageBodyStyle.Bare)]
public IQueryable < Menu > GetMenusByName(string name)
{
return (from m in CurrentDataSource.Menus
where m.Name.StartsWith(name)
select m).AsQueryable();
}
code snippet DataServicesHost/MenuDataService.cs
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