Fix #2097: Prefix:PropertyName is invalid syntax

ILSpy.BamlDecompiler.Tests/BamlTestRunner.cs

@@ -134,6 +134,12 @@ namespace ILSpy.BamlDecompiler.Tests
 			RunTest("cases/issue1547");
 		}
 
+		[Test]
+		public void Issue2097()
+		{
+			RunTest("cases/issue2097");
+		}
+
 		#region RunTest
 		void RunTest(string name)
 		{

ILSpy.BamlDecompiler.Tests/Cases/Issue2097.xaml

@@ -0,0 +1,5 @@
+<Window x:Class="ILSpy.BamlDecompiler.Tests.Cases.Issue2097" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:ILSpy.BamlDecompiler.Tests.Cases" Title="{x:Static local:Issue2097Temp.Test}" Height="450" Width="800">
+	<Grid>
+		<TextBlock Text="{x:Static local:Issue2097Temp.Test}" />
+	</Grid>
+</Window>

ILSpy.BamlDecompiler.Tests/Cases/Issue2097.xaml.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace ILSpy.BamlDecompiler.Tests.Cases
+{
+	/// <summary>
+	/// Interaction logic for Issue2097.xaml
+	/// </summary>
+	public partial class Issue2097 : Window
+	{
+		public Issue2097()
+		{
+			InitializeComponent();
+		}
+	}
+
+	class Issue2097Temp
+	{
+		public static string Test = "Hello";
+	}
+}

ILSpy.BamlDecompiler.Tests/ILSpy.BamlDecompiler.Tests.csproj

@@ -52,6 +52,7 @@
     </Compile>
     <Compile Include="Cases\CustomControl.cs" />
     <Compile Include="Cases\Issue1547.xaml.cs" />
+    <Compile Include="Cases\Issue2097.xaml.cs" />
     <Compile Include="Cases\MyControl.xaml.cs">
       <DependentUpon>MyControl.xaml</DependentUpon>
     </Compile>
@@ -86,6 +87,9 @@
     <Page Include="Cases\Issue1547.xaml">
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="Cases\Issue2097.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="Cases\Issue775.xaml">
       <SubType>Designer</SubType>
     </Page>

ILSpy.BamlDecompiler/Xaml/XamlProperty.cs

@@ -82,9 +82,7 @@ namespace ILSpy.BamlDecompiler.Xaml {
 				name = XmlConvert.EncodeLocalName(PropertyName);
 			else {
 				name = typeName.LocalName + "." + XmlConvert.EncodeLocalName(PropertyName);
-
-				if (parent == null || (parent.GetDefaultNamespace() != typeName.Namespace
-					                && parent.Name.Namespace != typeName.Namespace))
+				if (parent == null || parent.GetDefaultNamespace() != typeName.Namespace)
 					name = typeName.Namespace + name.LocalName;
 			}
 

ILSpy.BamlDecompiler/Xaml/XamlUtils.cs

@@ -41,11 +41,12 @@ namespace ILSpy.BamlDecompiler.Xaml {
 
 		public static string ToString(this XamlContext ctx, XElement elem, XName name) {
 			var sb = new StringBuilder();
-			if (name.Namespace != elem.GetDefaultNamespace() &&
-			    name.Namespace != elem.Name.Namespace &&
-			    !string.IsNullOrEmpty(name.Namespace.NamespaceName)) {
-				sb.Append(elem.GetPrefixOfNamespace(name.Namespace));
-				sb.Append(':');
+			if (name.Namespace != elem.GetDefaultNamespace()) {
+				var prefix = elem.GetPrefixOfNamespace(name.Namespace);
+				if (!string.IsNullOrEmpty(prefix)) {
+					sb.Append(prefix);
+					sb.Append(':');
+				}
 			}
 			sb.Append(name.LocalName);
 			return sb.ToString();