From eaf468e9e8d3ef17f397ef6bc5e73807a2bf3594 Mon Sep 17 00:00:00 2001
From: William S Fulton <wsf@fultondesigns.co.uk>
Date: Thu, 22 Sep 2022 18:54:49 +0100
Subject: [PATCH] C# CreateWStringFromUTF32 optimisation

Avoid UTF-32 to UTF-8 conversion then get string from UTF-8
Issue #2369
---
 Lib/csharp/wchar.i | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Lib/csharp/wchar.i b/Lib/csharp/wchar.i
index 2ada4df75..39b99ee22 100644
--- a/Lib/csharp/wchar.i
+++ b/Lib/csharp/wchar.i
@@ -49,8 +49,7 @@ static void * SWIG_csharp_wstring_callback(const wchar_t *s) {
 
       byte[] buffer = new byte[length * 4];
       global::System.Runtime.InteropServices.Marshal.Copy(cString, buffer, 0, buffer.Length);
-      byte[] utf8buffer = global::System.Text.Encoding.Convert(global::System.Text.Encoding.UTF32, global::System.Text.Encoding.UTF8, buffer);
-      return global::System.Text.Encoding.Default.GetString(utf8buffer);
+      return global::System.Text.Encoding.UTF32.GetString(buffer);
     }
 
     static SWIGWStringHelper() {