From b61ac3291368b4f8db43a5573ee05e60f52c7c25 Mon Sep 17 00:00:00 2001
From: Michael Croes <mycroes@gmail.com>
Date: Fri, 28 Jul 2023 23:52:57 +0200
Subject: [PATCH] fix: Permit nulls in string ToByteArray conversions

---
 S7.Net/Types/S7String.cs  | 2 +-
 S7.Net/Types/S7WString.cs | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/S7.Net/Types/S7String.cs b/S7.Net/Types/S7String.cs
index 46c4808..290aa53 100644
--- a/S7.Net/Types/S7String.cs
+++ b/S7.Net/Types/S7String.cs
@@ -58,7 +58,7 @@ namespace S7.Net.Types
         /// <param name="value">The string to convert to byte array.</param>
         /// <param name="reservedLength">The length (in characters) allocated in PLC for the string.</param>
         /// <returns>A <see cref="T:byte[]" /> containing the string header and string value with a maximum length of <paramref name="reservedLength"/> + 2.</returns>
-        public static byte[] ToByteArray(string value, int reservedLength)
+        public static byte[] ToByteArray(string? value, int reservedLength)
         {
             if (value is null)
             {
diff --git a/S7.Net/Types/S7WString.cs b/S7.Net/Types/S7WString.cs
index 8d8aabf..001c7ef 100644
--- a/S7.Net/Types/S7WString.cs
+++ b/S7.Net/Types/S7WString.cs
@@ -48,7 +48,7 @@ namespace S7.Net.Types
         /// <param name="value">The string to convert to byte array.</param>
         /// <param name="reservedLength">The length (in characters) allocated in PLC for the string.</param>
         /// <returns>A <see cref="T:byte[]" /> containing the string header and string value with a maximum length of <paramref name="reservedLength"/> + 4.</returns>
-        public static byte[] ToByteArray(string value, int reservedLength)
+        public static byte[] ToByteArray(string? value, int reservedLength)
         {
             if (value is null)
             {