CSharp generator: Fix required keyword and add write accessor (set/init)

src/NJsonSchema.CodeGeneration.CSharp/CSharpGeneratorSettings.cs

@@ -46,6 +46,7 @@ public CSharpGeneratorSettings()
             GenerateJsonMethods = false;
             EnforceFlagEnums = false;
             UseRequiredKeyword = false;
+            WriteAccessor = "set";
 
             ValueGenerator = new CSharpValueGenerator(this);
             PropertyNameGenerator = new CSharpPropertyNameGenerator();
@@ -152,6 +153,9 @@ public CSharpGeneratorSettings()
 
         /// <summary>Gets or sets a value indicating whether the C# 11 "required" keyword should be used for required properties (default: false). </summary>
         public bool UseRequiredKeyword { get; set; }
+
+        /// <summary> Gets the read accessor of properties ('set' | 'init').</summary>
+        public string WriteAccessor { get; set; }
 
         /// <summary>Gets or sets a value indicating whether named/referenced dictionaries should be inlined or generated as class with dictionary inheritance.</summary>
         public bool InlineNamedDictionaries { get; set; }

src/NJsonSchema.CodeGeneration.CSharp/Models/ClassTemplateModel.cs

@@ -170,6 +170,9 @@ public ClassTemplateModel(string typeName, CSharpGeneratorSettings settings,
 
         /// <summary>Gets a value indicating whether to use the C# 11 "required" keyword.</summary>
         public bool UseRequiredKeyword => _settings.UseRequiredKeyword;
+
+        /// <summary> Gets the read accessor of properties ('set' | 'init').</summary>
+        public string WriteAccessor => _settings.WriteAccessor;
 
         /// <summary>Gets the access modifier of property setters (default: '').</summary>
         public string PropertySetterAccessModifier => !string.IsNullOrEmpty(_settings.PropertySetterAccessModifier) ? _settings.PropertySetterAccessModifier + " " : "";

src/NJsonSchema.CodeGeneration.CSharp/Templates/Class.liquid

@@ -107,7 +107,7 @@
     [System.Obsolete{% if property.HasDeprecatedMessage %}({{ property.DeprecatedMessage | literal }}){% endif %}]
 {%-   endif -%}
     {%- template Class.Property.Annotations -%}
-    public {% if UseRequiredKeyword and property.IsRequired %}required {% endif %}{{ property.Type }} {{ property.PropertyName }}{% if RenderInpc == false and RenderPrism == false %} { get; {% if property.HasSetter and RenderRecord == false %}set; {% elsif RenderRecord and GenerateNativeRecords %}init; {% endif %}}{% if property.HasDefaultValue and RenderRecord == false %} = {{ property.DefaultValue }};{% elsif GenerateNullableReferenceTypes and RenderRecord == false %} = default!;{% endif %}
+    public {% if UseRequiredKeyword and property.IsRequired %}required {% endif %}{{ property.Type }} {{ property.PropertyName }}{% if RenderInpc == false and RenderPrism == false %} { get; {% if property.HasSetter and RenderRecord == false %}{{ WriteAccessor }}; {% elsif RenderRecord and GenerateNativeRecords %}init; {% endif %}}{% if property.HasDefaultValue and RenderRecord == false and UseRequiredKeyword == false %} = {{ property.DefaultValue }};{% elsif GenerateNullableReferenceTypes and RenderRecord == false and UseRequiredKeyword == false %} = default!;{% endif %}
 {%- else -%}
     {
         get { return {{ property.FieldName }}; }