Add demo of binding to array index.

Tried to add a button to shuffle ObservableCollection, but Command binding doesn't seem to work.

samples/BindingTest/App.cs

@@ -18,7 +18,6 @@ namespace BindingTest
 
             Log.Logger = new LoggerConfiguration()
                 .Filter.ByIncludingOnly(Matching.WithProperty("Area", "Property"))
-                .Filter.ByIncludingOnly(Matching.WithProperty<string>("Property", x => x == "Text"))
                 .MinimumLevel.Verbose()
                 .WriteTo.Trace(outputTemplate: "[{Id:X8}] [{SourceContext}] {Message}")
                 .CreateLogger();

samples/BindingTest/BindingTest.csproj

@@ -50,6 +50,22 @@
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Reactive.Core, Version=2.2.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Rx-Core.2.2.5\lib\net45\System.Reactive.Core.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Reactive.Interfaces, Version=2.2.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Rx-Interfaces.2.2.5\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Reactive.Linq, Version=2.2.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Rx-Linq.2.2.5\lib\net45\System.Reactive.Linq.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Reactive.PlatformServices, Version=2.2.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Rx-PlatformServices.2.2.5\lib\net45\System.Reactive.PlatformServices.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
@@ -64,6 +80,7 @@
     </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ViewModels\MainWindowViewModel.cs" />
+    <Compile Include="ViewModels\TestItem.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />

samples/BindingTest/MainWindow.paml

@@ -1,9 +1,15 @@
 <Window xmlns="https://github.com/perspex">
-  <StackPanel Margin="18" Gap="4">
-    <TextBlock Text="{Binding SimpleBinding}"/>
-    <TextBox Watermark="Two Way" UseFloatingWatermark="True" Text="{Binding SimpleBinding}"/>
-    <TextBox Watermark="One Way" UseFloatingWatermark="True" Text="{Binding SimpleBinding, Mode=OneWay}"/>
-    <TextBox Watermark="One Time" UseFloatingWatermark="True" Text="{Binding SimpleBinding, Mode=OneTime}"/>
-    <TextBox Watermark="One Way To Source" UseFloatingWatermark="True" Text="{Binding SimpleBinding, Mode=OneWayToSource}"/>
+  <StackPanel Orientation="Horizontal">
+    <StackPanel Margin="18" Gap="4" Width="200">
+      <TextBlock Text="{Binding SimpleBinding}"/>
+      <TextBox Watermark="Two Way" UseFloatingWatermark="True" Text="{Binding SimpleBinding}"/>
+      <TextBox Watermark="One Way" UseFloatingWatermark="True" Text="{Binding SimpleBinding, Mode=OneWay}"/>
+      <TextBox Watermark="One Time" UseFloatingWatermark="True" Text="{Binding SimpleBinding, Mode=OneTime}"/>
+      <TextBox Watermark="One Way To Source" UseFloatingWatermark="True" Text="{Binding SimpleBinding, Mode=OneWayToSource}"/>
+    </StackPanel>
+    <StackPanel Margin="18" Gap="4" Width="200">
+      <TextBox Watermark="Items[1].StringValue" UseFloatingWatermark="True" Text="{Binding Items[1].StringValue}"/>
+      <Button Command="{Binding ShuffleItems}">Shuffle</Button>
+    </StackPanel>
   </StackPanel>
 </Window>

samples/BindingTest/ViewModels/MainWindowViewModel.cs

@@ -1,4 +1,6 @@
-using ReactiveUI;
+using System;
+using System.Collections.ObjectModel;
+using ReactiveUI;
 
 namespace BindingTest.ViewModels
 {
@@ -6,6 +8,26 @@ namespace BindingTest.ViewModels
     {
         private string _simpleBinding = "Simple Binding";
 
+        public MainWindowViewModel()
+        {
+            Items = new ObservableCollection<TestItem>
+            {
+                new TestItem { StringValue = "Foo" },
+                new TestItem { StringValue = "Bar" },
+                new TestItem { StringValue = "Baz" },
+            };
+
+            ShuffleItems = ReactiveCommand.Create();
+            ShuffleItems.Subscribe(_ =>
+            {
+                var r = new Random();
+                Items[r.Next(Items.Count)] = Items[r.Next(Items.Count)];
+            });
+        }
+
+        public ObservableCollection<TestItem> Items { get; }
+        public ReactiveCommand<object> ShuffleItems { get; }
+
         public string SimpleBinding
         {
             get { return _simpleBinding; }

samples/BindingTest/ViewModels/TestItem.cs

@@ -0,0 +1,15 @@
+using ReactiveUI;
+
+namespace BindingTest.ViewModels
+{
+    public class TestItem : ReactiveObject
+    {
+        private string stringValue = "String Value";
+
+        public string StringValue
+        {
+            get { return stringValue; }
+            set { this.RaiseAndSetIfChanged(ref this.stringValue, value); }
+        }
+    }
+}

samples/BindingTest/packages.config

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Rx-Core" version="2.2.5" targetFramework="net46" />
+  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net46" />
+  <package id="Rx-Linq" version="2.2.5" targetFramework="net46" />
+  <package id="Rx-Main" version="2.2.5" targetFramework="net46" />
+  <package id="Rx-PlatformServices" version="2.2.5" targetFramework="net46" />
   <package id="Serilog" version="1.5.9" targetFramework="net46" />
   <package id="Splat" version="1.6.2" targetFramework="net46" />
 </packages>

src/Markup/Perspex.Markup.Xaml/OmniXAML

@@ -1 +1 @@
-Subproject commit 49e6ec001f5873cf2290e0bc1f6f06ca9b9cf808
+Subproject commit c890902fbaecb4752ed8e9fde2571396794fe06d

src/Perspex.Base/PerspexObject.cs

@@ -187,7 +187,7 @@ namespace Perspex
 
                 if (sourceBinding == null && mode > BindingMode.OneWay)
                 {
-                    throw new InvalidOperationException("Can only bind OneWay to plain IObservable.");
+                    mode = BindingMode.OneWay;
                 }
 
                 switch (mode)