From ecc0c3b963d10bdece5485eb058a23ea4dee1405 Mon Sep 17 00:00:00 2001
From: Ellpeck <me@ellpeck.de>
Date: Fri, 19 Jul 2024 21:35:47 +0200
Subject: [PATCH] Allow static json converters to write null values

---
 CHANGELOG.md                          | 2 +-
 MLEM.Data/Json/StaticJsonConverter.cs | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index affef7c..8fdba87 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -63,7 +63,7 @@ Improvements
 ### MLEM.Data
 Improvements
 - **Moved extension methods into matching namespaces to avoid unexpected suggestions**
-- Allow static json converters to throw an exception if a key does not exist
+- Allow static json converters to write null values and to throw an exception if a key does not exist
 
 Removals
 - **Removed obsolete types DynamicEnumConverter, CopyExtensions, DynamicEnum, NetBufferSerializer, and NetExtensions**
diff --git a/MLEM.Data/Json/StaticJsonConverter.cs b/MLEM.Data/Json/StaticJsonConverter.cs
index 851328f..3d13dbd 100644
--- a/MLEM.Data/Json/StaticJsonConverter.cs
+++ b/MLEM.Data/Json/StaticJsonConverter.cs
@@ -58,8 +58,12 @@ namespace MLEM.Data.Json {
         /// <param name="value">The value.</param>
         /// <param name="serializer">The calling serializer.</param>
         public override void WriteJson(JsonWriter writer, T value, JsonSerializer serializer) {
+            if (value == null) {
+                writer.WriteNull();
+                return;
+            }
             if (!this.inverse.TryGetValue(value, out var key))
-                throw new InvalidOperationException($"Cannot write {value} that is not a registered entry");
+                throw new KeyNotFoundException($"Cannot write {value} that is not a registered entry");
             writer.WriteValue(key);
         }