fix #264: add UnresolvableDependencyPropertyDescriptor and UnresolvableType to represent types from assemblies that cannot be loaded

ILSpy.BamlDecompiler/CecilType.cs

@@ -32,11 +32,11 @@ namespace ILSpy.BamlDecompiler
 			if (type == null)
 				throw new ArgumentNullException("type");
 			if (!(type is CecilType))
-				throw new ArgumentException("type has to be a CecilType");
+				return false;
 			
 			CecilType ct = (CecilType)type;
 			
-			var t = ct.type;
+			var t = this.type;
 			
 			while (t != null) {
 				if (t == ct.type)
@@ -60,7 +60,7 @@ namespace ILSpy.BamlDecompiler
 			if (type == null)
 				throw new ArgumentNullException("type");
 			if (!(type is CecilType))
-				throw new ArgumentException("type has to be a CecilType");
+				return false;
 			
 			return this.type == ((CecilType)type).type;
 		}

ILSpy.BamlDecompiler/CecilTypeResolver.cs

@@ -56,7 +56,7 @@ namespace ILSpy.BamlDecompiler
 			if (type == null) {
 				var otherAssembly = resolver.Resolve(assemblyName);
 				if (otherAssembly == null)
-					throw new Exception("could not resolve '" + assemblyName + "'!");
+					return new UnresolvableType(name);
 				type = otherAssembly.MainModule.GetType(fullName.Replace('+', '/'));
 				
 				if (type == null) {
@@ -65,7 +65,7 @@ namespace ILSpy.BamlDecompiler
 			}
 			
 			if (type == null)
-				throw new Exception("could not resolve '" + name + "'!");
+				return new UnresolvableType(name);
 			
 			return new CecilType(type);
 		}
@@ -83,10 +83,15 @@ namespace ILSpy.BamlDecompiler
 		
 		public IDependencyPropertyDescriptor GetDependencyPropertyDescriptor(string name, IType ownerType, IType targetType)
 		{
-			if (!(ownerType is CecilType))
-				throw new ArgumentException();
+			if (ownerType == null)
+				throw new ArgumentNullException("ownerType");
 			
-			return new CecilDependencyPropertyDescriptor(name, ((CecilType)ownerType).type);
+			if (ownerType is CecilType)
+				return new CecilDependencyPropertyDescriptor(name, ((CecilType)ownerType).type);
+			if (ownerType is UnresolvableType)
+				return new UnresolvableDependencyPropertyDescriptor();
+			
+			throw new ArgumentException("Invalid IType: " + ownerType.GetType());
 		}
 		
 		public string RuntimeVersion {

ILSpy.BamlDecompiler/Ricciolo.StylesExplorer.MarkupReflection/IDependencyPropertyDescriptor.cs

@@ -11,4 +11,13 @@ namespace Ricciolo.StylesExplorer.MarkupReflection
 	{
 		bool IsAttached { get; }
 	}
+	
+	public class UnresolvableDependencyPropertyDescriptor : IDependencyPropertyDescriptor
+	{
+		public bool IsAttached {
+			get {
+				return false;
+			}
+		}
+	}
 }

ILSpy.BamlDecompiler/Ricciolo.StylesExplorer.MarkupReflection/IType.cs

@@ -17,4 +17,36 @@ namespace Ricciolo.StylesExplorer.MarkupReflection
 		bool IsSubclassOf(IType type);
 		bool Equals(IType type);
 	}
+	
+	public class UnresolvableType : IType
+	{
+		string assemblyQualifiedName;
+		
+		public UnresolvableType(string assemblyQualifiedName)
+		{
+			this.assemblyQualifiedName = assemblyQualifiedName;
+		}
+		
+		public IType BaseType {
+			get {
+				return null;
+			}
+		}
+		
+		public string AssemblyQualifiedName {
+			get {
+				return assemblyQualifiedName;
+			}
+		}
+		
+		public bool IsSubclassOf(IType type)
+		{
+			return Equals(type);
+		}
+		
+		public bool Equals(IType type)
+		{
+			return type is UnresolvableType && type.AssemblyQualifiedName == AssemblyQualifiedName;
+		}
+	}
 }