feat: option to use c# 11 required keyword for required properties

src/NJsonSchema.CodeGeneration.CSharp/CSharpGeneratorSettings.cs

@@ -46,6 +46,7 @@ public CSharpGeneratorSettings()
             PropertySetterAccessModifier = string.Empty;
             GenerateJsonMethods = false;
             EnforceFlagEnums = false;
+            UseRequiredKeyword = false;
 
             ValueGenerator = new CSharpValueGenerator(this);
             PropertyNameGenerator = new CSharpPropertyNameGenerator();
@@ -147,6 +148,9 @@ public CSharpGeneratorSettings()
         /// <summary>Gets or sets a value indicating whether enums should be always generated as bit flags (default: false).</summary>
         public bool EnforceFlagEnums { get; set; }
 
+        /// <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 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; }
 
@@ -165,4 +169,4 @@ public CSharpGeneratorSettings()
         /// <summary>Generate C# 9.0 record types instead of record-like classes.</summary>
         public bool GenerateNativeRecords { get; set; }
     }
-}
+}

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

@@ -151,6 +151,9 @@ public ClassTemplateModel(string typeName, CSharpGeneratorSettings settings,
         /// <summary>Gets or sets the access modifier of generated classes and interfaces.</summary>
         public string TypeAccessModifier => _settings.TypeAccessModifier;
 
+        /// <summary>Gets a value indicating whether to use the C# 11 "required" keyword.</summary>
+        public bool UseRequiredKeyword => _settings.UseRequiredKeyword;
+
         /// <summary>Gets the access modifier of property setters (default: '').</summary>
         public string PropertySetterAccessModifier => !string.IsNullOrEmpty(_settings.PropertySetterAccessModifier) ? _settings.PropertySetterAccessModifier + " " : "";
 
@@ -169,4 +172,4 @@ public ClassTemplateModel(string typeName, CSharpGeneratorSettings settings,
         /// <summary>Gets the deprecated message.</summary>
         public string? DeprecatedMessage => _schema.DeprecatedMessage;
     }
-}
+}

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

@@ -95,7 +95,7 @@
     [System.Obsolete{% if property.HasDeprecatedMessage %}({{ property.DeprecatedMessage | literal }}){% endif %}]
 {%-   endif -%}
     {%- template Class.Property.Annotations -%}
-    public {{ 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 %}set; {% elsif RenderRecord and GenerateNativeRecords %}init; {% endif %}}{% if property.HasDefaultValue and RenderRecord == false %} = {{ property.DefaultValue }};{% elsif GenerateNullableReferenceTypes and RenderRecord == false %} = default!;{% endif %}
 {% else %}
     {
         get { return {{ property.FieldName }}; }
@@ -143,4 +143,4 @@
     {% template Class.Inpc %}
 {%- endif -%}
     {% template Class.Body %}
-}
+}