--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MetroWpf/MetroWpf.Framework/ServiceClient.cs	Mon Mar 12 23:05:21 2012 +0800
@@ -0,0 +1,57 @@
+using System;
+using System.Threading.Tasks;
+
+namespace MetroWpf.Framework
+{
+  public class ServiceClient
+  {
+    public static T Execute<T>(
+      Func<T> func, 
+      int timeoutMilliseconds, 
+      int maxAttempts)
+    {
+      T result;
+      Exception e;
+      TryExecute(func, timeoutMilliseconds, maxAttempts, out result, out e);
+      if (e != null) throw e;
+      return result;
+    }
+
+    public static bool TryExecute<T>(
+      Func<T> func, 
+      int timeoutMilliseconds, 
+      int maxAttempts, 
+      out T result, 
+      out Exception e)
+    {
+      bool isSuccessful = false;
+      var t = default(T);
+      e = null;
+
+      var task = Task.Factory.StartNew(() =>
+      {
+        for (int i = 0; i < maxAttempts; i++)
+        {
+          try { t = func(); }
+          catch { if (i == maxAttempts - 1) { throw; } }
+        }
+      });
+
+      try
+      {
+        task.Wait(timeoutMilliseconds);
+        if (!task.IsCompleted)
+          e = new TimeoutException();
+        else
+          isSuccessful = true;
+      }
+      catch (AggregateException ae)
+      {
+        e = ae.InnerException;
+      }
+
+      result = t;
+      return isSuccessful;
+    }
+  }
+}