From fd4f5aeee43b50dc69a653b4cceaaaa09055f753 Mon Sep 17 00:00:00 2001
From: "g.verdier" <g.verdier@criteo.com>
Date: Wed, 29 May 2024 17:57:36 -0400
Subject: [PATCH] csharp: use span-based ToBase64 in ByteString

---
 csharp/src/Google.Protobuf/ByteString.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/csharp/src/Google.Protobuf/ByteString.cs b/csharp/src/Google.Protobuf/ByteString.cs
index fc5d925fa7..b8e0b39133 100644
--- a/csharp/src/Google.Protobuf/ByteString.cs
+++ b/csharp/src/Google.Protobuf/ByteString.cs
@@ -117,6 +117,9 @@ namespace Google.Protobuf
         /// <returns>A base64 representation of this <c>ByteString</c>.</returns>
         public string ToBase64()
         {
+#if NET5_0_OR_GREATER
+            return Convert.ToBase64String(bytes.Span);
+#else
             if (MemoryMarshal.TryGetArray(bytes, out ArraySegment<byte> segment))
             {
                 // Fast path. ByteString was created with an array, so pass the underlying array.
@@ -127,6 +130,7 @@ namespace Google.Protobuf
                 // Slow path. BytesString is not an array. Convert memory and pass result to ToBase64String.
                 return Convert.ToBase64String(bytes.ToArray());
             }
+#endif
         }
 
         /// <summary>