From e1b2ac56977b08eba8ca19d1bd3168a983f79a1f Mon Sep 17 00:00:00 2001
From: Nikita Tsukanov <keks9n@gmail.com>
Date: Wed, 22 Feb 2017 18:31:35 +0300
Subject: [PATCH] Add a way to pass view model for the main window

---
 src/Avalonia.Controls/AppBuilderBase.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Controls/AppBuilderBase.cs b/src/Avalonia.Controls/AppBuilderBase.cs
index b098c270a5..97de093a59 100644
--- a/src/Avalonia.Controls/AppBuilderBase.cs
+++ b/src/Avalonia.Controls/AppBuilderBase.cs
@@ -115,13 +115,16 @@ namespace Avalonia.Controls
         /// Starts the application with an instance of <typeparamref name="TMainWindow"/>.
         /// </summary>
         /// <typeparam name="TMainWindow">The window type.</typeparam>
-        public void Start<TMainWindow>()
+        /// <param name="dataContextProvider">A delegate that will be called to create a data context for the window (optional).</param>
+        public void Start<TMainWindow>(Func<object> dataContextProvider = null)
             where TMainWindow : Window, new()
         {
             Setup();
             BeforeStartCallback(Self);
 
             var window = new TMainWindow();
+            if (dataContextProvider != null)
+                window.DataContext = dataContextProvider();
             window.Show();
             Instance.Run(window);
         }