Allowing a WinRT app to do loopback network calls

One issue I’ve encountered while building Metro-style WinRT apps on Windows 8 is the need to have my app interact with a WCF service running on the same machine.

This is obviously a common scenario for any n-tier or SOA app development. The challenge we face is that WinRT apps are blocked from calling back to localhost (127.0.0.1). The challenge and solution are described here:

http://msdn.microsoft.com/en-us/library/windows/apps/Hh780593.aspx

To find the real application name (moniker) necessary, I wrote a simple command line utility to read the registry:

using System; 

using Microsoft.Win32;

namespace WinRtAppList 

{ 

  class Program 

  { 

    static void Main(string[] args) 

    { 

      var reg = Registry. 

        CurrentUser.OpenSubKey("Software"). 

        OpenSubKey("Classes"). 

        OpenSubKey("Local Settings"). 

        OpenSubKey("Software"). 

        OpenSubKey("Microsoft"). 

        OpenSubKey("Windows"). 

        OpenSubKey("CurrentVersion"). 

        OpenSubKey("AppContainer"). 

        OpenSubKey("Mappings");

      var items = reg.GetSubKeyNames(); 

      string query = null; 

      if (args.Length > 0) 

        query = args[0].ToLower();

      foreach (var item in items) 

      { 

        var app = reg.OpenSubKey(item); 

        var displayName = app.GetValue("DisplayName").ToString(); 

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