From 1ecadf265e2e562d5ba5eeb8c59cab44caa82f26 Mon Sep 17 00:00:00 2001
From: Venkad000 <20pt38@psgtech.ac.in>
Date: Thu, 21 Aug 2025 04:49:03 +0000
Subject: [PATCH 1/2] ToString() throws and exception on Mono The function
 ToString() only takes into consideration how CoreClr's
 CustomAttributeTypedArgument is implemented and does a cast accordingly which
 causes it to fail with an InvalidCastException on Mono. So the casts should
 be runtime specific for it to not throw an InvalidCastException.

---
 .../src/System/Reflection/CustomAttributeTypedArgument.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/libraries/System.Private.CoreLib/src/System/Reflection/CustomAttributeTypedArgument.cs b/src/libraries/System.Private.CoreLib/src/System/Reflection/CustomAttributeTypedArgument.cs
index e91941fc4df3a9..82ccdab3ba0d19 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Reflection/CustomAttributeTypedArgument.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Reflection/CustomAttributeTypedArgument.cs
@@ -56,7 +56,11 @@ internal string ToString(bool typed)
 
             if (ArgumentType.IsArray)
             {
+#if !MONO
                 IList<CustomAttributeTypedArgument> array = (IList<CustomAttributeTypedArgument>)Value!;
+#else
+                IList array = (IList)Value!;
+#endif
                 Type elementType = ArgumentType.GetElementType()!;
 
                 var result = new ValueStringBuilder(stackalloc char[256]);
@@ -73,7 +77,11 @@ internal string ToString(bool typed)
                     {
                         result.Append(", ");
                     }
+#if !MONO
                     result.Append(array[i].ToString(elementType != typeof(object)));
+#else
+                    result.Append(array[i]!.ToString());
+#endif
                 }
 
                 result.Append(" }");

From b10a8aa5a3515ae323d845c9db15207a7c0d6cd8 Mon Sep 17 00:00:00 2001
From: Venkad000 <20pt38@psgtech.ac.in>
Date: Thu, 21 Aug 2025 05:27:13 +0000
Subject: [PATCH 2/2] Added missing headerfile

---
 .../src/System/Reflection/CustomAttributeTypedArgument.cs        | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libraries/System.Private.CoreLib/src/System/Reflection/CustomAttributeTypedArgument.cs b/src/libraries/System.Private.CoreLib/src/System/Reflection/CustomAttributeTypedArgument.cs
index 82ccdab3ba0d19..8e6324f24ad994 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Reflection/CustomAttributeTypedArgument.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Reflection/CustomAttributeTypedArgument.cs
@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Text;