Add nullability annotations

ICSharpCode.ILSpyX/Analyzers/AnalyzerContext.cs

@@ -32,17 +32,17 @@ namespace ICSharpCode.ILSpyX.Analyzers
 	/// </summary>
 	public class AnalyzerContext
 	{
-		public AssemblyList AssemblyList { get; internal set; }
+		public required AssemblyList AssemblyList { get; init; }
 
 	/// <summary>
 	/// CancellationToken. Currently Analyzers do not support cancellation from the UI, but it should be checked nonetheless.
 	/// </summary>
-		public CancellationToken CancellationToken { get; internal set; }
+	public CancellationToken CancellationToken { get; init; }
 
 	/// <summary>
 	/// Currently used language.
 	/// </summary>
-		public ILanguage Language { get; internal set; }
+	public required ILanguage Language { get; init; }
 
 /// <summary>
 /// Allows the analyzer to control whether the tree nodes will be sorted.
@@ -51,9 +51,9 @@ namespace ICSharpCode.ILSpyX.Analyzers
 /// </summary>
 public bool SortResults { get; set; }
 
-		public MethodBodyBlock GetMethodBody(IMethod method)
+public MethodBodyBlock? GetMethodBody(IMethod method)
 {
-			if (!method.HasBody || method.MetadataToken.IsNil)
+	if (!method.HasBody || method.MetadataToken.IsNil || method.ParentModule?.MetadataFile == null)
 		return null;
 	var module = method.ParentModule.MetadataFile;
 	var md = module.Metadata.GetMethodDefinition((MethodDefinitionHandle)method.MetadataToken);

ICSharpCode.ILSpyX/Analyzers/AnalyzerHelpers.cs

@@ -34,7 +34,7 @@ namespace ICSharpCode.ILSpyX.Analyzers
 			{
 				case HandleKind.MethodDefinition:
 					return member == analyzedMethod.MetadataToken
-						&& module == analyzedMethod.ParentModule.MetadataFile;
+						&& module == analyzedMethod.ParentModule?.MetadataFile;
 				case HandleKind.MemberReference:
 					var mr = metadata.GetMemberReference((MemberReferenceHandle)member);
 					if (mr.GetKind() != MemberReferenceKind.Method)
@@ -48,7 +48,7 @@ namespace ICSharpCode.ILSpyX.Analyzers
 			}
 		}
 
-		public static ISymbol GetParentEntity(DecompilerTypeSystem ts, CustomAttribute customAttribute)
+		public static ISymbol? GetParentEntity(DecompilerTypeSystem ts, CustomAttribute customAttribute)
 		{
 			var metadata = ts.MainModule.MetadataFile.Metadata;
 			switch (customAttribute.Parent.Kind)

ICSharpCode.ILSpyX/Analyzers/AnalyzerScope.cs

@@ -24,7 +24,6 @@ using System.Threading;
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.Decompiler.Util;
-using ICSharpCode.ILSpyX;
 
 namespace ICSharpCode.ILSpyX.Analyzers
 {
@@ -61,19 +60,19 @@ namespace ICSharpCode.ILSpyX.Analyzers
 		public IEnumerable<MetadataFile> GetModulesInScope(CancellationToken ct)
 		{
 			if (IsLocal)
-				return new[] { TypeScope.ParentModule.MetadataFile };
+				return new[] { TypeScope.ParentModule!.MetadataFile! };
 
 			if (effectiveAccessibility.LessThanOrEqual(Accessibility.Internal))
 				return GetModuleAndAnyFriends(TypeScope, ct);
 
-			return GetReferencingModules(TypeScope.ParentModule.MetadataFile, ct);
+			return GetReferencingModules(TypeScope.ParentModule!.MetadataFile!, ct);
 		}
 
 		public IEnumerable<MetadataFile> GetAllModules()
 		{
 			return assemblyListSnapshot.GetAllAssembliesAsync().GetAwaiter().GetResult()
 				.Select(asm => asm.GetMetadataFileOrNull())
-				.Where(x => x != null);
+				.Where(x => x != null)!;
 		}
 
 		public DecompilerTypeSystem ConstructTypeSystem(MetadataFile module)
@@ -113,7 +112,7 @@ namespace ICSharpCode.ILSpyX.Analyzers
 			else
 			{
 				accessibility = input.Accessibility;
-				typeScope = input.DeclaringTypeDefinition;
+				typeScope = input.DeclaringTypeDefinition!;
 			}
 			// Once we reach a private entity, we leave the loop with typeScope set to the class that
 			// contains the private entity = the scope that needs to be searched.
@@ -123,7 +122,7 @@ namespace ICSharpCode.ILSpyX.Analyzers
 			{
 				accessibility = accessibility.Intersect(typeScope.Accessibility);
 				prevTypeScope = typeScope;
-				typeScope = prevTypeScope.DeclaringTypeDefinition;
+				typeScope = prevTypeScope.DeclaringTypeDefinition!;
 			}
 			if (typeScope == null)
 			{
@@ -181,7 +180,7 @@ namespace ICSharpCode.ILSpyX.Analyzers
 
 		IEnumerable<MetadataFile> GetModuleAndAnyFriends(ITypeDefinition typeScope, CancellationToken ct)
 		{
-			var self = typeScope.ParentModule.MetadataFile;
+			var self = typeScope.ParentModule!.MetadataFile!;
 
 			yield return self;
 
@@ -191,8 +190,9 @@ namespace ICSharpCode.ILSpyX.Analyzers
 			var friendAssemblies = new HashSet<string>();
 			foreach (var attribute in attributes)
 			{
-				string assemblyName = attribute.DecodeValue(typeProvider).FixedArguments[0].Value as string;
+				string? assemblyName = attribute.DecodeValue(typeProvider).FixedArguments[0].Value as string;
-				assemblyName = assemblyName.Split(',')[0]; // strip off any public key info
+				assemblyName = assemblyName?.Split(',')[0]; // strip off any public key info
+				if (assemblyName != null)
 					friendAssemblies.Add(assemblyName);
 			}
 

ICSharpCode.ILSpyX/Analyzers/Builtin/EventImplementedByAnalyzer.cs

@@ -17,7 +17,6 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
 
@@ -44,17 +43,19 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		IEnumerable<IEntity> AnalyzeType(IEvent analyzedEntity, ITypeDefinition type)
 		{
+			if (analyzedEntity.DeclaringTypeDefinition?.ParentModule?.MetadataFile == null)
+				yield break;
 			var token = analyzedEntity.MetadataToken;
 			var declaringTypeToken = analyzedEntity.DeclaringTypeDefinition.MetadataToken;
 			var module = analyzedEntity.DeclaringTypeDefinition.ParentModule.MetadataFile;
 			var allTypes = type.GetAllBaseTypeDefinitions();
-			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule.MetadataFile == module))
+			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule?.MetadataFile == module))
 				yield break;
 
 			foreach (var @event in type.Events)
 			{
 				var baseMembers = InheritanceHelper.GetBaseMembers(@event, true);
-				if (baseMembers.Any(m => m.MetadataToken == token && m.ParentModule.MetadataFile == module))
+				if (baseMembers.Any(m => m.MetadataToken == token && m.ParentModule?.MetadataFile == module))
 					yield return @event;
 			}
 		}

ICSharpCode.ILSpyX/Analyzers/Builtin/EventOverriddenByAnalyzer.cs

@@ -17,7 +17,6 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
 
@@ -44,11 +43,13 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		IEnumerable<IEntity> AnalyzeType(IEvent analyzedEntity, ITypeDefinition type)
 		{
+			if (analyzedEntity.DeclaringTypeDefinition?.ParentModule?.MetadataFile == null)
+				yield break;
 			var token = analyzedEntity.MetadataToken;
 			var declaringTypeToken = analyzedEntity.DeclaringTypeDefinition.MetadataToken;
 			var module = analyzedEntity.DeclaringTypeDefinition.ParentModule.MetadataFile;
 			var allTypes = type.GetAllBaseTypeDefinitions();
-			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule.MetadataFile == module))
+			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule?.MetadataFile == module))
 				yield break;
 
 			foreach (var @event in type.Events)
@@ -56,7 +57,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 				if (!@event.IsOverride)
 					continue;
 				var baseMembers = InheritanceHelper.GetBaseMembers(@event, false);
-				if (baseMembers.Any(p => p.MetadataToken == token && p.ParentModule.MetadataFile == module))
+				if (baseMembers.Any(p => p.MetadataToken == token && p.ParentModule?.MetadataFile == module))
 				{
 					yield return @event;
 				}

ICSharpCode.ILSpyX/Analyzers/Builtin/FieldAccessAnalyzer.cs

@@ -74,6 +74,8 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			var scope = context.GetScopeOf((IEntity)analyzedSymbol);
 			foreach (var type in scope.GetTypesInScope(context.CancellationToken))
 			{
+				if (type.ParentModule?.MetadataFile == null)
+					continue;
 				var mappingInfo = context.Language.GetCodeMappingInfo(type.ParentModule.MetadataFile, type.MetadataToken);
 				var methods = type.GetMembers(m => m is IMethod, Options).OfType<IMethod>();
 				foreach (var method in methods)
@@ -119,7 +121,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		bool IsUsedInMethod(IField analyzedField, IMethod method, CodeMappingInfo mappingInfo, AnalyzerContext context)
 		{
-			if (method.MetadataToken.IsNil)
+			if (method.MetadataToken.IsNil || method.ParentModule?.MetadataFile == null)
 				return false;
 			var module = method.ParentModule.MetadataFile;
 			foreach (var part in mappingInfo.GetMethodParts((MethodDefinitionHandle)method.MetadataToken))
@@ -144,7 +146,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		bool ScanMethodBody(IField analyzedField, IMethod method, MethodBodyBlock methodBody)
 		{
-			if (methodBody == null)
+			if (methodBody == null || method.ParentModule?.MetadataFile == null)
 				return false;
 
 			var mainModule = (MetadataModule)method.ParentModule;
@@ -170,7 +172,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 				EntityHandle fieldHandle = MetadataTokenHelpers.EntityHandleOrNil(blob.ReadInt32());
 				if (!fieldHandle.Kind.IsMemberKind())
 					continue;
-				IField field;
+				IField? field;
 				try
 				{
 					field = mainModule.ResolveEntity(fieldHandle, genericContext) as IField;
@@ -183,7 +185,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 					continue;
 
 				if (field.MetadataToken == analyzedField.MetadataToken
-					&& field.ParentModule.MetadataFile == analyzedField.ParentModule.MetadataFile)
+					&& field.ParentModule?.MetadataFile == analyzedField.ParentModule!.MetadataFile)
 					return true;
 			}
 

ICSharpCode.ILSpyX/Analyzers/Builtin/MemberImplementsInterfaceAnalyzer.cs

@@ -38,7 +38,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			Debug.Assert(!member.IsStatic);
 
 			var baseMembers = InheritanceHelper.GetBaseMembers(member, includeImplementedInterfaces: true);
-			return baseMembers.Where(m => m.DeclaringTypeDefinition.Kind == TypeKind.Interface);
+			return baseMembers.Where(m => m.DeclaringTypeDefinition?.Kind == TypeKind.Interface);
 		}
 
 		public bool Show(ISymbol symbol)

ICSharpCode.ILSpyX/Analyzers/Builtin/MethodImplementedByAnalyzer.cs

@@ -16,13 +16,9 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
-using System;
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 using ICSharpCode.Decompiler.TypeSystem;
 
@@ -47,17 +43,19 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		IEnumerable<IEntity> AnalyzeType(IMethod analyzedEntity, ITypeDefinition type)
 		{
+			if (analyzedEntity.DeclaringTypeDefinition?.ParentModule?.MetadataFile == null)
+				yield break;
 			var token = analyzedEntity.MetadataToken;
 			var declaringTypeToken = analyzedEntity.DeclaringTypeDefinition.MetadataToken;
 			var module = analyzedEntity.DeclaringTypeDefinition.ParentModule.MetadataFile;
 			var allTypes = type.GetAllBaseTypeDefinitions();
-			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule.MetadataFile == module))
+			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule?.MetadataFile == module))
 				yield break;
 
 			foreach (var method in type.Methods)
 			{
 				var baseMembers = InheritanceHelper.GetBaseMembers(method, true);
-				if (baseMembers.Any(m => m.MetadataToken == token && m.ParentModule.MetadataFile == module))
+				if (baseMembers.Any(m => m.MetadataToken == token && m.ParentModule?.MetadataFile == module))
 					yield return method;
 			}
 		}

ICSharpCode.ILSpyX/Analyzers/Builtin/MethodOverriddenByAnalyzer.cs

@@ -17,7 +17,6 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
 
@@ -46,11 +45,13 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		IEnumerable<IEntity> AnalyzeType(IMethod analyzedEntity, ITypeDefinition type)
 		{
+			if (analyzedEntity.DeclaringTypeDefinition?.ParentModule?.MetadataFile == null)
+				yield break;
 			var token = analyzedEntity.MetadataToken;
 			var declaringTypeToken = analyzedEntity.DeclaringTypeDefinition.MetadataToken;
 			var module = analyzedEntity.DeclaringTypeDefinition.ParentModule.MetadataFile;
 			var allTypes = type.GetAllBaseTypeDefinitions();
-			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule.MetadataFile == module))
+			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule?.MetadataFile == module))
 				yield break;
 
 			foreach (var method in type.Methods)
@@ -58,7 +59,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 				if (!method.IsOverride)
 					continue;
 				var baseMembers = InheritanceHelper.GetBaseMembers(method, false);
-				if (baseMembers.Any(p => p.MetadataToken == token && p.ParentModule.MetadataFile == module))
+				if (baseMembers.Any(p => p.MetadataToken == token && p.ParentModule?.MetadataFile == module))
 				{
 					yield return method;
 				}

ICSharpCode.ILSpyX/Analyzers/Builtin/MethodUsedByAnalyzer.cs

@@ -18,12 +18,10 @@
 
 using System;
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
 using System.Reflection.Metadata;
 
-using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Disassembler;
 using ICSharpCode.Decompiler.Metadata;
 using ICSharpCode.Decompiler.TypeSystem;
@@ -46,9 +44,11 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 			var analyzedMethod = (IMethod)analyzedSymbol;
 			var analyzedBaseMethod = (IMethod)InheritanceHelper.GetBaseMember(analyzedMethod);
+			if (analyzedMethod.ParentModule?.MetadataFile == null)
+				yield break;
 			var mapping = context.Language
 				.GetCodeMappingInfo(analyzedMethod.ParentModule.MetadataFile,
-					analyzedMethod.DeclaringTypeDefinition.MetadataToken);
+					analyzedMethod.DeclaringTypeDefinition!.MetadataToken);
 
 			var parentMethod = mapping.GetParentMethod((MethodDefinitionHandle)analyzedMethod.MetadataToken);
 			if (parentMethod != analyzedMethod.MetadataToken)
@@ -57,6 +57,8 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			var scope = context.GetScopeOf(analyzedMethod);
 			foreach (var type in scope.GetTypesInScope(context.CancellationToken))
 			{
+				if (type.ParentModule?.MetadataFile == null)
+					continue;
 				var parentModule = (MetadataModule)type.ParentModule;
 				mapping = null;
 				var methods = type.GetMembers(m => m is IMethod, Options).OfType<IMethod>();
@@ -110,9 +112,9 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			return ScanMethodBody(analyzedEntity, method, analyzedBaseMethod, context.GetMethodBody(method));
 		}
 
-		static bool ScanMethodBody(IMethod analyzedMethod, IMethod method, IMethod analyzedBaseMethod, MethodBodyBlock methodBody)
+		static bool ScanMethodBody(IMethod analyzedMethod, IMethod method, IMethod analyzedBaseMethod, MethodBodyBlock? methodBody)
 		{
-			if (methodBody == null)
+			if (methodBody == null || method.ParentModule?.MetadataFile == null)
 				return false;
 
 			var mainModule = (MetadataModule)method.ParentModule;
@@ -145,7 +147,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 					}
 				}
 
-				IMember m;
+				IMember? m;
 				try
 				{
 					m = (mainModule.ResolveEntity(member, genericContext) as IMember)?.MemberDefinition;
@@ -192,7 +194,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 		static bool IsSameMember(IMember analyzedMethod, IMember m)
 		{
 			return m.MetadataToken == analyzedMethod.MetadataToken
-				&& m.ParentModule.MetadataFile == analyzedMethod.ParentModule.MetadataFile;
+				&& m.ParentModule?.MetadataFile == analyzedMethod.ParentModule!.MetadataFile;
 		}
 	}
 }

ICSharpCode.ILSpyX/Analyzers/Builtin/MethodUsesAnalyzer.cs

@@ -38,7 +38,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		public IEnumerable<ISymbol> Analyze(ISymbol symbol, AnalyzerContext context)
 		{
-			if (symbol is IMethod method && method.ParentModule.MetadataFile is MetadataFile corFile)
+			if (symbol is IMethod method && method.ParentModule?.MetadataFile is MetadataFile corFile)
 			{
 				var typeSystem = context.GetOrCreateTypeSystem(corFile);
 				return context.Language.GetCodeMappingInfo(corFile, method.MetadataToken)
@@ -95,7 +95,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 							case HandleKind.TypeDefinition:
 							case HandleKind.TypeReference:
 							case HandleKind.TypeSpecification:
-								IType ty;
+								IType? ty;
 								try
 								{
 									ty = module.ResolveType(member, genericContext);
@@ -110,7 +110,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 							case HandleKind.MethodSpecification:
 							case HandleKind.MemberReference:
 							case HandleKind.FieldDefinition:
-								IEntity m;
+								IEntity? m;
 								try
 								{
 									m = module.ResolveEntity(member, genericContext);

ICSharpCode.ILSpyX/Analyzers/Builtin/MethodVirtualUsedByAnalyzer.cs

@@ -41,9 +41,16 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 		{
 			Debug.Assert(analyzedSymbol is IMethod);
 			var analyzedMethod = (IMethod)analyzedSymbol;
+
+			if (analyzedMethod.ParentModule?.MetadataFile == null)
+				yield break;
+
+			if (analyzedMethod.DeclaringTypeDefinition?.MetadataToken.IsNil != true)
+				yield break;
+
 			var mapping = context.Language
 				.GetCodeMappingInfo(analyzedMethod.ParentModule.MetadataFile,
-					analyzedMethod.DeclaringTypeDefinition.MetadataToken);
+					analyzedMethod.DeclaringTypeDefinition?.MetadataToken ?? default);
 
 			var parentMethod = mapping.GetParentMethod((MethodDefinitionHandle)analyzedMethod.MetadataToken);
 			if (parentMethod != analyzedMethod.MetadataToken)
@@ -52,7 +59,9 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			var scope = context.GetScopeOf(analyzedMethod);
 			foreach (var type in scope.GetTypesInScope(context.CancellationToken))
 			{
-				var parentModule = (MetadataModule)type.ParentModule;
+				var parentModule = (MetadataModule?)type.ParentModule;
+				if (parentModule?.MetadataFile == null)
+					continue;
 				mapping = context.Language.GetCodeMappingInfo(parentModule.MetadataFile, type.MetadataToken);
 				var methods = type.GetMembers(m => m is IMethod, Options).OfType<IMethod>();
 				foreach (var method in methods)
@@ -105,9 +114,9 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			return ScanMethodBody(analyzedEntity, method, context.GetMethodBody(method));
 		}
 
-		static bool ScanMethodBody(IMethod analyzedMethod, IMethod method, MethodBodyBlock methodBody)
+		static bool ScanMethodBody(IMethod analyzedMethod, IMethod method, MethodBodyBlock? methodBody)
 		{
-			if (methodBody == null)
+			if (methodBody == null || method.ParentModule?.MetadataFile == null)
 				return false;
 			var mainModule = (MetadataModule)method.ParentModule;
 			var blob = methodBody.GetILReader();
@@ -131,7 +140,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 							case HandleKind.MethodSpecification:
 							case HandleKind.MemberReference:
 								var m = (mainModule.ResolveEntity(member, genericContext) as IMember)?.MemberDefinition;
-								if (m != null && m.MetadataToken == analyzedMethod.MetadataToken && m.ParentModule.MetadataFile == analyzedMethod.ParentModule.MetadataFile)
+								if (m != null && m.MetadataToken == analyzedMethod.MetadataToken && m.ParentModule?.MetadataFile == analyzedMethod.ParentModule!.MetadataFile)
 								{
 									return true;
 								}

ICSharpCode.ILSpyX/Analyzers/Builtin/PropertyImplementedByAnalyzer.cs

@@ -17,7 +17,6 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
 
@@ -44,17 +43,19 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		IEnumerable<IEntity> AnalyzeType(IProperty analyzedEntity, ITypeDefinition type)
 		{
+			if (analyzedEntity.DeclaringTypeDefinition?.ParentModule?.MetadataFile == null)
+				yield break;
 			var token = analyzedEntity.MetadataToken;
 			var declaringTypeToken = analyzedEntity.DeclaringTypeDefinition.MetadataToken;
 			var module = analyzedEntity.DeclaringTypeDefinition.ParentModule.MetadataFile;
 			var allTypes = type.GetAllBaseTypeDefinitions();
-			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule.MetadataFile == module))
+			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule?.MetadataFile == module))
 				yield break;
 
 			foreach (var property in type.Properties)
 			{
 				var baseMembers = InheritanceHelper.GetBaseMembers(property, true);
-				if (baseMembers.Any(m => m.MetadataToken == token && m.ParentModule.MetadataFile == module))
+				if (baseMembers.Any(m => m.MetadataToken == token && m.ParentModule?.MetadataFile == module))
 					yield return property;
 			}
 		}

ICSharpCode.ILSpyX/Analyzers/Builtin/PropertyOverriddenByAnalyzer.cs

@@ -16,13 +16,9 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
-using System;
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 using ICSharpCode.Decompiler.TypeSystem;
 
@@ -47,11 +43,13 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 
 		IEnumerable<IEntity> AnalyzeType(IProperty analyzedEntity, ITypeDefinition type)
 		{
+			if (analyzedEntity.DeclaringTypeDefinition?.ParentModule?.MetadataFile == null)
+				yield break;
 			var token = analyzedEntity.MetadataToken;
 			var declaringTypeToken = analyzedEntity.DeclaringTypeDefinition.MetadataToken;
 			var module = analyzedEntity.DeclaringTypeDefinition.ParentModule.MetadataFile;
 			var allTypes = type.GetAllBaseTypeDefinitions();
-			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule.MetadataFile == module))
+			if (!allTypes.Any(t => t.MetadataToken == declaringTypeToken && t.ParentModule?.MetadataFile == module))
 				yield break;
 
 			foreach (var property in type.Properties)
@@ -59,7 +57,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 				if (!property.IsOverride)
 					continue;
 				var baseMembers = InheritanceHelper.GetBaseMembers(property, false);
-				if (baseMembers.Any(p => p.MetadataToken == token && p.ParentModule.MetadataFile == module))
+				if (baseMembers.Any(p => p.MetadataToken == token && p.ParentModule?.MetadataFile == module))
 				{
 					yield return property;
 				}

ICSharpCode.ILSpyX/Analyzers/Builtin/TypeExposedByAnalyzer.cs

@@ -16,13 +16,8 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
-using System;
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 
 namespace ICSharpCode.ILSpyX.Analyzers.Builtin
@@ -52,7 +47,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 		{
 			if (analyzedType.Kind == TypeKind.Enum
 				&& type.MetadataToken == analyzedType.MetadataToken
-				&& type.ParentModule.MetadataFile == analyzedType.ParentModule.MetadataFile)
+				&& type.ParentModule?.MetadataFile == analyzedType.ParentModule?.MetadataFile)
 				yield break;
 
 			if (!context.Language.ShowMember(type))

ICSharpCode.ILSpyX/Analyzers/Builtin/TypeExtensionMethodsAnalyzer.cs

@@ -17,7 +17,6 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 
 using ICSharpCode.Decompiler.TypeSystem;
@@ -48,6 +47,9 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			if (!type.HasExtensionMethods)
 				yield break;
 
+			if (analyzedType.ParentModule?.MetadataFile == null)
+				yield break;
+
 			foreach (IMethod method in type.Methods)
 			{
 				if (!method.IsExtensionMethod)
@@ -56,7 +58,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 				var firstParamType = method.Parameters[0].Type.GetDefinition();
 				if (firstParamType != null &&
 					firstParamType.MetadataToken == analyzedType.MetadataToken &&
-					firstParamType.ParentModule.MetadataFile == analyzedType.ParentModule.MetadataFile)
+					firstParamType.ParentModule?.MetadataFile == analyzedType.ParentModule.MetadataFile)
 					yield return method;
 			}
 		}

ICSharpCode.ILSpyX/Analyzers/Builtin/TypeInstantiatedByAnalyzer.cs

@@ -18,12 +18,9 @@
 
 using System;
 using System.Collections.Generic;
-using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
 using System.Reflection.Metadata;
-using System.Text;
-using System.Threading.Tasks;
 
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.Disassembler;
@@ -46,6 +43,8 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			var scope = context.GetScopeOf((ITypeDefinition)analyzedSymbol);
 			foreach (var type in scope.GetTypesInScope(context.CancellationToken))
 			{
+				if (type.ParentModule?.MetadataFile == null)
+					continue;
 				var mappingInfo = context.Language.GetCodeMappingInfo(type.ParentModule.MetadataFile, type.MetadataToken);
 				var methods = type.GetMembers(m => m is IMethod, Options).OfType<IMethod>();
 				foreach (var method in methods)
@@ -94,9 +93,9 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			return ScanMethodBody(analyzedEntity, method, context.GetMethodBody(method));
 		}
 
-		bool ScanMethodBody(ITypeDefinition analyzedEntity, IMethod method, MethodBodyBlock methodBody)
+		bool ScanMethodBody(ITypeDefinition analyzedEntity, IMethod method, MethodBodyBlock? methodBody)
 		{
-			if (methodBody == null)
+			if (methodBody == null || method.ParentModule?.MetadataFile == null)
 				return false;
 			var blob = methodBody.GetILReader();
 			var module = (MetadataModule)method.ParentModule;
@@ -134,7 +133,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 					continue;
 
 				if (ctor.DeclaringTypeDefinition?.MetadataToken == analyzedEntity.MetadataToken
-					&& ctor.ParentModule.MetadataFile == analyzedEntity.ParentModule.MetadataFile)
+					&& ctor.ParentModule?.MetadataFile == analyzedEntity.ParentModule!.MetadataFile)
 					return true;
 			}
 

ICSharpCode.ILSpyX/Analyzers/Builtin/TypeUsedByAnalyzer.cs

@@ -107,7 +107,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 				if (found || ScanMethodBody(analyzedType, module, md, decoder))
 				{
 					var method = typeSystem.MainModule.GetDefinition(h);
-					yield return method?.AccessorOwner ?? method;
+					yield return method.AccessorOwner ?? method;
 				}
 			}
 
@@ -221,7 +221,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 			}
 			return false;
 
-			bool CheckAttributeValue(object value)
+			bool CheckAttributeValue(object? value)
 			{
 				if (value is TokenSearchResult typeofType)
 				{
@@ -408,7 +408,7 @@ namespace ICSharpCode.ILSpyX.Analyzers.Builtin
 		public override IType VisitTypeDefinition(ITypeDefinition type)
 		{
 			Found |= TypeDefinition.MetadataToken == type.MetadataToken
-				&& TypeDefinition.ParentModule.MetadataFile == type.ParentModule.MetadataFile;
+				&& TypeDefinition.ParentModule!.MetadataFile == type.ParentModule?.MetadataFile;
 			return base.VisitTypeDefinition(type);
 		}
 

ICSharpCode.ILSpyX/Analyzers/ExportAnalyzerAttribute.cs

@@ -28,7 +28,7 @@ namespace ICSharpCode.ILSpyX.Analyzers
 		public ExportAnalyzerAttribute() : base("Analyzer", typeof(IAnalyzer))
 		{ }
 
-		public string Header { get; set; }
+		public required string Header { get; init; }
 
 		public int Order { get; set; }
 	}

ICSharpCode.ILSpyX/Search/SearchResult.cs

@@ -42,18 +42,14 @@ namespace ICSharpCode.ILSpyX.Search
 
 		public float Fitness { get; set; }
 
-#nullable disable
+		public required string Name { get; set; }
-		public string Name { get; set; }
+		public required string Location { get; set; }
-		public string Location { get; set; }
+		public required string Assembly { get; set; }
-		public string Assembly { get; set; }
-#nullable enable
 		public object? ToolTip { get; set; }
-#nullable disable
+		public required object Image { get; set; }
-		public object Image { get; set; }
+		public required object LocationImage { get; set; }
-		public object LocationImage { get; set; }
 
-		public object AssemblyImage { get; set; }
+		public required object AssemblyImage { get; set; }
-#nullable enable
 
 		public override string ToString()
 		{

ILSpy.Tests/Analyzers/MemberImplementsInterfaceAnalyzerTests.cs

@@ -145,7 +145,7 @@ namespace ICSharpCode.ILSpy.Tests.Analyzers
 			var analyzer = new MemberImplementsInterfaceAnalyzer();
 
 			// Act
-			var results = analyzer.Analyze(symbol, new AnalyzerContext());
+			var results = analyzer.Analyze(symbol, new AnalyzerContext() { AssemblyList = new ILSpyX.AssemblyList(), Language = new CSharpLanguage() });
 
 			// Assert
 			Assert.That(results, Is.Not.Null);

ILSpy/Search/SearchPane.cs

@@ -218,7 +218,14 @@ namespace ICSharpCode.ILSpy.Search
 
 			if (resultsAdded > 0 && Results.Count == MAX_RESULTS)
 			{
-				Results.Add(new SearchResult { Name = Properties.Resources.SearchAbortedMoreThan1000ResultsFound });
+				Results.Add(new SearchResult {
+					Name = Properties.Resources.SearchAbortedMoreThan1000ResultsFound,
+					Location = null!,
+					Assembly = null!,
+					Image = null!,
+					LocationImage = null!,
+					AssemblyImage = null!,
+				});
 				currentSearch.Cancel();
 			}
 		}