GUI: Load metadata file

Il2CppInspector.GUI/App.xaml.cs

@@ -2,16 +2,34 @@
 using System.Collections.Generic;
 using System.Configuration;
 using System.Data;
+using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using System.Windows;
+using Il2CppInspector;
 
-namespace Il2CppInspector.GUI
+namespace Il2CppInspectorGUI
 {
     /// <summary>
     /// Interaction logic for App.xaml
     /// </summary>
     public partial class App : Application
     {
+        public Metadata CurrentMetadata { get; private set; }
+
+        public Exception LastException { get; private set; }
+
+        // Attempt to load an IL2CPP metadata file
+        public Task<bool> LoadMetadataAsync(string metadataFile) =>
+            Task.Run(() => {
+                try {
+                    CurrentMetadata = new Metadata(new MemoryStream(File.ReadAllBytes(metadataFile)));
+                    return true;
+                }
+                catch (Exception ex) {
+                    LastException = ex;
+                    return false;
+                }
+            });
     }
 }