Add GetTypesSafe, fix crash on MonoField lookup

Author: ghorsington

Il2CppInterop.Common/Extensions/AssemblyExtensions.cs

@@ -0,0 +1,18 @@
+using System.Reflection;
+
+namespace Il2CppInterop.Common.Extensions;
+
+internal static class AssemblyExtensions
+{
+    public static Type[] GetTypesSafe(this Assembly assembly)
+    {
+        try
+        {
+            return assembly.GetTypes();
+        }
+        catch (ReflectionTypeLoadException ex)
+        {
+            return ex.Types.Where(t => t != null).ToArray();
+        }
+    }
+}

Il2CppInterop.Runtime/Injection/InjectorHelpers.cs

@@ -8,6 +8,7 @@
 using System.Runtime.InteropServices;
 using System.Threading;
 using Il2CppInterop.Common;
+using Il2CppInterop.Common.Extensions;
 using Il2CppInterop.Common.XrefScans;
 using Il2CppInterop.Runtime.Runtime;
 using Il2CppInterop.Runtime.Runtime.VersionSpecific.Assembly;
@@ -340,7 +341,7 @@ private static d_ClassGetFieldDefaultValue FindClassGetFieldDefaultValue(bool fo
             if (forceICallMethod)
             {
                 // MonoField isn't present on 2021.2.0+
-                var monoFieldType = Il2CppMscorlib.GetTypes().SingleOrDefault((x) => x.Name is "MonoField");
+                var monoFieldType = Il2CppMscorlib.GetTypesSafe().SingleOrDefault((x) => x.Name is "MonoField");
                 if (monoFieldType == null)
                     throw new Exception($"Unity {Il2CppInteropRuntime.Instance.UnityVersion} is not supported at the moment: MonoField isn't present in Il2Cppmscorlib.dll for unity version, unable to fetch icall");
 

Il2CppInterop.Runtime/Runtime/UnityVersionHandler.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using System.Reflection;
 using Il2CppInterop.Common;
+using Il2CppInterop.Common.Extensions;
 using Il2CppInterop.Runtime.Runtime.VersionSpecific.Assembly;
 using Il2CppInterop.Runtime.Runtime.VersionSpecific.AssemblyName;
 using Il2CppInterop.Runtime.Runtime.VersionSpecific.Class;
@@ -120,14 +121,7 @@ private static T GetHandler<T>()
 
     private static Type[] GetAllTypesSafe()
     {
-        try
-        {
-            return typeof(UnityVersionHandler).Assembly.GetTypes();
-        }
-        catch (ReflectionTypeLoadException re)
-        {
-            return re.Types.Where(t => t != null).ToArray();
-        }
+        return typeof(UnityVersionHandler).Assembly.GetTypesSafe();
     }
 
     //Assemblies