diff --git a/src/Microsoft.DotNet.Wpf/src/ReachFramework/Packaging/XpsFixedPageReaderWriter.cs b/src/Microsoft.DotNet.Wpf/src/ReachFramework/Packaging/XpsFixedPageReaderWriter.cs
index af81fd485..ece7f5c71 100644
--- a/src/Microsoft.DotNet.Wpf/src/ReachFramework/Packaging/XpsFixedPageReaderWriter.cs
+++ b/src/Microsoft.DotNet.Wpf/src/ReachFramework/Packaging/XpsFixedPageReaderWriter.cs
@@ -1867,23 +1867,22 @@ Uri imageUri
             )
         {
             //Extract file extension without '.'
-            String path = imageUri.OriginalString;
-            ReadOnlySpan<char> extension = Path.GetExtension(path).ToLower(CultureInfo.InvariantCulture).AsSpan(1);
-
+            ReadOnlySpan<char> path = imageUri.OriginalString.AsSpan();
+            ReadOnlySpan<char> extension = Path.GetExtension(path).Slice(1);
             ContentType contentType;
-            if (extension.Equals(XpsS0Markup.JpgExtension, StringComparison.Ordinal))
+            if (extension.Equals(XpsS0Markup.JpgExtension, StringComparison.OrdinalIgnoreCase))
             {
-                contentType =  XpsS0Markup.JpgContentType;
+                contentType = XpsS0Markup.JpgContentType;
             }
-            else if (extension.Equals(XpsS0Markup.PngExtension, StringComparison.Ordinal))
+            else if (extension.Equals(XpsS0Markup.PngExtension, StringComparison.OrdinalIgnoreCase))
             {
                 contentType = XpsS0Markup.PngContentType;
             }
-            else if (extension.Equals(XpsS0Markup.TifExtension, StringComparison.Ordinal))
+            else if (extension.Equals(XpsS0Markup.TifExtension, StringComparison.OrdinalIgnoreCase))
             {
                 contentType = XpsS0Markup.TifContentType;
             }
-            else if (extension.Equals(XpsS0Markup.WdpExtension, StringComparison.Ordinal))
+            else if (extension.Equals(XpsS0Markup.WdpExtension, StringComparison.OrdinalIgnoreCase))
             {
                 contentType = XpsS0Markup.WdpContentType;
             }
@@ -1892,9 +1891,8 @@ Uri imageUri
                 //default to PNG
                 contentType = XpsS0Markup.PngContentType;
             }
-
             return contentType;
-         }
+        }
 
 
         /// <summary>
diff --git a/src/Microsoft.DotNet.Wpf/src/System.Xaml/System/Xaml/Schema/XamlTypeInvoker.cs b/src/Microsoft.DotNet.Wpf/src/System.Xaml/System/Xaml/Schema/XamlTypeInvoker.cs
index 7eedd71a9..6ad2c1a98 100644
--- a/src/Microsoft.DotNet.Wpf/src/System.Xaml/System/Xaml/Schema/XamlTypeInvoker.cs
+++ b/src/Microsoft.DotNet.Wpf/src/System.Xaml/System/Xaml/Schema/XamlTypeInvoker.cs
@@ -15,7 +15,6 @@ namespace System.Xaml.Schema
     public class XamlTypeInvoker
     {
         private static XamlTypeInvoker s_Unknown;
-        private static object[] s_emptyObjectArray = Array.Empty<object>();
 
         private Dictionary<XamlType, MethodInfo> _addMethods;
         internal MethodInfo EnumeratorMethod { get; set; }
@@ -226,7 +225,7 @@ public virtual IEnumerator GetItems(object instance)
                 throw new NotSupportedException(SR.Get(SRID.OnlySupportedOnCollectionsAndDictionaries));
             }
             MethodInfo getEnumMethod = GetEnumeratorMethod();
-            return (IEnumerator)SafeReflectionInvoker.InvokeMethod(getEnumMethod, instance, s_emptyObjectArray);
+            return (IEnumerator)SafeReflectionInvoker.InvokeMethod(getEnumMethod, instance, Array.Empty<object>());
         }
 
         // vvvvv---- Unused members.  Servicing policy is to retain these anyway.  -----vvvvv