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Is it possible to iterate a loop in an Asp.Net web service

Anonymous User 2025 11-Dec-2014

I have a console application in which I am using an asp.net webservice.Also,I had declared a display method in my service which accepts and iterates a string array.But,when I executed the console application it showed an empty console window.Why the array contents are not being displayed? 

Code that uses the below service 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text; 
namespace usingWebServiceExample
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] arr = new string[3] {"harry","ronn","sheldon" };
            localhost.Service service = new localhost.Service();
            service.display(arr);
            Console.Read();
        }
    }
}

Service Code: 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
 
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
// [System.Web.Script.Services.ScriptService]
 
public class Service : System.Web.Services.WebService
{
    public Service()
    {
    }
 
    [WebMethod]
    public void display(string[] arr)
    {
        for (int i = 0; i < arr.Length; i++)
        {
            Console.WriteLine(arr[i]);
        }
    }
}

asp.net c#  web services 
Updated on 11-Dec-2014
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2 Answers

Norman Reedus

Norman Reedus

11-Dec-2014

You need to either return an array of string to print to the client, or use duplex binding and implement a callback on client side to print a message to console. 

Here is a sample duplex callback implementation: Server: 

[ServiceContract(CallbackContract=typeof(IConsoleCallback))]
public interface IService1{ 
    [OperationContract(IsOneWay = true)]
    void Display(string[] arr);
} 
public interface IConsoleCallback{
    [OperationContract(IsOneWay = true)]
    void WriteLine(string message);
} 
public class Service1 : IService1
{
    public void Display(string[] arr)
    {
        var callback = OperationContext.Current.GetCallbackChannel<IConsoleCallback>();
 
        for (int i = 0; i < arr.Length; i++)
        {
            callback.WriteLine(arr[i]);
        }
    }
}

Server web.config: 

<protocolMapping>
    <add binding="wsDualHttpBinding" scheme="http" />
    <add binding="wsDualHttpBinding" scheme="https" />
</protocolMapping>   

Client: 

class Program
{
    class ConsoleCallback : ServiceReference1.IService1Callback
    {
        public void WriteLine(string message)
        {
            Console.WriteLine(message);
        }
    }  
    static void Main(string[] args)
    {
        string[] arr = new string[3] { "harry", "ronn", "sheldon" };
        var service = new ServiceReference1.Service1Client(new InstanceContext(new ConsoleCallback()));
        service.Display(arr);
        Console.Read();
    }
}

David Miller

David Miller

11-Dec-2014

You probably need to use  System.Diagnostics.Debug.WriteLine(...) instead of Console.WriteLine() for asp.net and you would be able to see the results in output window in the visual studio. 

Writing log might does not make much sense here, you can return the array using string.Join 

public string display(string[] arr)
{
    return Join(",", arr)
}

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