Additional changes to make value as content property for setter

src/Microsoft.DotNet.Wpf/ApiCompat/Baselines/PresentationFramework-ref.baseline.txt

@@ -40,8 +40,8 @@ CannotChangeAttribute : Attribute 'System.Windows.LocalizabilityAttribute' on 'S
 CannotChangeAttribute : Attribute 'System.Windows.LocalizabilityAttribute' on 'System.Windows.ResourceDictionary' changed from '[LocalizabilityAttribute(16)]' in the contract to '[LocalizabilityAttribute(LocalizationCategory.Ignore)]' in the implementation.
 CannotChangeAttribute : Attribute 'System.ComponentModel.DesignerSerializationVisibilityAttribute' on 'System.Windows.ResourceDictionary.DeferrableContent' changed from '[DesignerSerializationVisibilityAttribute(0)]' in the contract to '[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden)]' in the implementation.
 CannotChangeAttribute : Attribute 'System.ComponentModel.DesignerSerializationVisibilityAttribute' on 'System.Windows.ResourceDictionary.Source' changed from '[DesignerSerializationVisibilityAttribute(0)]' in the contract to '[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden)]' in the implementation.
-CannotRemoveAttribute : Attribute 'System.Windows.Markup.ContentPropertyAttribute' exists on 'System.Windows.Setter' in the contract but not the implementation.
 CannotChangeAttribute : Attribute 'System.Windows.LocalizabilityAttribute' on 'System.Windows.Setter.Property' changed from '[LocalizabilityAttribute(0, Modifiability=0, Readability=0)]' in the contract to '[LocalizabilityAttribute(LocalizationCategory.None, Modifiability=Modifiability.Unmodifiable, Readability=Readability.Unreadable)]' in the implementation.
+CannotRemoveAttribute : Attribute 'System.ComponentModel.DesignerSerializationVisibilityAttribute' exists on 'System.Windows.Setter.Value' in the contract but not the implementation.
 CannotChangeAttribute : Attribute 'System.Windows.LocalizabilityAttribute' on 'System.Windows.Setter.Value' changed from '[LocalizabilityAttribute(0, Readability=0)]' in the contract to '[LocalizabilityAttribute(LocalizationCategory.None, Readability=Readability.Unreadable)]' in the implementation.
 CannotChangeAttribute : Attribute 'System.Windows.LocalizabilityAttribute' on 'System.Windows.SetterBase' changed from '[LocalizabilityAttribute(16)]' in the contract to '[LocalizabilityAttribute(LocalizationCategory.Ignore)]' in the implementation.
 CannotChangeAttribute : Attribute 'System.Windows.LocalizabilityAttribute' on 'System.Windows.StaticResourceExtension' changed from '[LocalizabilityAttribute(17)]' in the contract to '[LocalizabilityAttribute(LocalizationCategory.NeverLocalize)]' in the implementation.

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Markup/Baml2006/WpfGeneratedKnownProperties.cs

@@ -10,7 +10,7 @@ namespace System.Windows.Baml2006
 {
     partial class WpfSharedBamlSchemaContext: XamlSchemaContext
     {
-        const int KnownPropertyCount = 270;
+        const int KnownPropertyCount = 272;
 
 
         private WpfKnownMember CreateKnownMember(short bamlNumber)
@@ -286,6 +286,7 @@ private WpfKnownMember CreateKnownMember(short bamlNumber)
                 case 268: return Create_BamlProperty_XmlDataProvider_XmlSerializer();
                 case 269: return Create_BamlProperty_TextBox_IsReadOnly();
                 case 270: return Create_BamlProperty_RichTextBox_IsReadOnly();
+                case 272: return Create_BamlProperty_Setter_Value();
                 default:
                     throw new InvalidOperationException("Invalid BAML number");
             }

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Markup/Baml2006/WpfGeneratedKnownTypes.cs

@@ -8844,6 +8844,7 @@ private WpfKnownType Create_BamlType_Setter(bool isBamlType, bool useV3Rules)
                                               typeof(System.Windows.Setter),
                                               isBamlType, useV3Rules);
             bamlType.DefaultConstructor = delegate() { return new System.Windows.Setter(); };
+            bamlType.ContentPropertyName = "Value";
             bamlType.Freeze();
             return bamlType;
         }

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Markup/KnownTypes.cs

@@ -1107,7 +1107,8 @@ internal enum KnownProperties : short
         XmlDataProvider_XmlSerializer,
         MaxProperty,
         TextBox_IsReadOnly,
-        RichTextBox_IsReadOnly
+        RichTextBox_IsReadOnly,
+        Setter_Value
     }
 
 #if !BAMLDASM
@@ -2786,6 +2787,9 @@ internal static string GetContentPropertyName(KnownElements knownElement)
                 case KnownElements.ToolBarTray:
                     name = "ToolBars";
                     break;
+                case KnownElements.Setter:
+                    name = "Value";
+                    break;
                 case KnownElements.ControlTemplate:
                 case KnownElements.DataTemplate:
                 case KnownElements.FrameworkTemplate:
@@ -3676,6 +3680,10 @@ internal static short GetKnownPropertyAttributeId(KnownElements typeID, string f
                     if (string.Equals(fieldName, "XmlSerializer", StringComparison.Ordinal))
                         return (short)KnownProperties.XmlDataProvider_XmlSerializer;
                     break;
+                case KnownElements.Setter:
+                    if (string.Equals(fieldName, "Value", StringComparison.Ordinal))
+                        return (short)KnownProperties.Setter_Value;
+                    break;
             }
             return 0;
         }

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Markup/StyleXamlParser.cs

@@ -712,14 +712,6 @@ public override void WriteElementStart(XamlElementStartNode xamlElementStartNode
                     _inEventSetter = true;
 #endif
                 }
-                else if ((depth == 2 && _setterElementEncountered) ||
-                         (depth == 3 && _setterPropertyEncountered))
-                {
-                    ThrowException(nameof(SR.ParserNoSetterChild),
-                                   xamlElementStartNode.TypeFullName,
-                                   xamlElementStartNode.LineNumber,
-                                   xamlElementStartNode.LinePosition);
-                }
             }
 
             // Handle custom serializers within the style section by creating an instance

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Setter.cs

@@ -161,6 +161,7 @@ public DependencyProperty Property
         /// </summary>
         [System.Windows.Markup.DependsOn("Property")]
         [System.Windows.Markup.DependsOn("TargetName")]
+        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
         [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)] // Not localizable by-default
         [TypeConverter(typeof(System.Windows.Markup.SetterTriggerConditionValueConverter))]
         public object Value

src/Microsoft.DotNet.Wpf/src/PresentationFramework/ref/PresentationFramework.cs

@@ -1149,6 +1149,7 @@ public partial class SessionEndingCancelEventArgs : System.ComponentModel.Cancel
     public delegate void SessionEndingCancelEventHandler(object sender, System.Windows.SessionEndingCancelEventArgs e);
     [System.Windows.Markup.XamlSetMarkupExtensionAttribute("ReceiveMarkupExtension")]
     [System.Windows.Markup.XamlSetTypeConverterAttribute("ReceiveTypeConverter")]
+    [System.Windows.Markup.ContentPropertyAttribute("Value")]
     public partial class Setter : System.Windows.SetterBase, System.ComponentModel.ISupportInitialize
     {
         public Setter() { }