Add method to override Property => Field mapping

ReactiveXaml.Sample/App.xaml.cs

@@ -96,7 +96,7 @@ namespace ReactiveXamlSample
         PersonEntry _SelectedPerson;
         public PersonEntry SelectedPerson {
             get { return _SelectedPerson; }
-            set { _SelectedPerson = this.RaiseAndSetIfChanged(x => _SelectedPerson, value); }
+            set { _SelectedPerson = this.RaiseAndSetIfChanged(x => x.SelectedPerson, value); }
         }
 
 

ReactiveXaml/Interfaces.cs

@@ -87,6 +87,10 @@ namespace ReactiveXaml
             LoggerFactory = (prefix) => new NullLogger(prefix);
 #endif
 
+            // Default name for the field backing the "Foo" property => "_Foo"
+            // This is used for ReactiveObject's RaiseAndSetIfChanged mixin
+            GetFieldNameForPropertyNameFunc = new Func<string,string>(x => "_" + x);
+
             if (InUnitTestRunner())
             {
                 Console.Error.WriteLine("*** Detected Unit Test Runner, setting Scheduler to Immediate ***");
@@ -120,6 +124,7 @@ namespace ReactiveXaml
         public static Func<string, ILog> LoggerFactory { get; set; }
 
         public static Func<UserException, RecoveryOptionResult> CustomErrorPresentationFunc { get; set; }
+        public static Func<string, string> GetFieldNameForPropertyNameFunc { get; set; }
         public static RecoveryOptionResult DefaultUnitTestRecoveryResult { get; set; }
 
         public static bool InUnitTestRunner()
@@ -153,6 +158,11 @@ namespace ReactiveXaml
             // TODO: Pop the WPF dialog here if we're not in Silverlight
             throw new NotImplementedException();
         }
+
+        public static string GetFieldNameForProperty(string PropertyName)
+        {
+            return GetFieldNameForPropertyNameFunc(PropertyName);
+        }
     }
 }
 

ReactiveXaml/ReactiveObject.cs

@@ -161,9 +161,10 @@ namespace ReactiveXaml
                 throw new ArgumentException("Property expression must be of the form 'x => x.SomeProperty'");
             }
             
-            field = (typeof(TObj)).GetField("_" + prop_name, BindingFlags.NonPublic | BindingFlags.Instance);
+            var field_name = RxApp.GetFieldNameForProperty(prop_name);
+            field = (typeof(TObj)).GetField(field_name, BindingFlags.NonPublic | BindingFlags.Instance);
             if (field == null) {
-                throw new ArgumentException("You must declare a backing field for this property named _" + prop_name);
+                throw new ArgumentException("You must declare a backing field for this property named: " + prop_name);
             }
 
             var field_val = field.GetValue(This);