Apply Obsolete attribute to deprecated enums and enum values in C# generated code

Fixes #10513

csharp/protos/unittest_issues.proto

@@ -59,10 +59,12 @@ message NegativeEnumMessage {
 // Decorate fields with [deprecated=true] as [System.Obsolete]
 
 message DeprecatedChild {
+    option deprecated = true;
 }
 
 enum DeprecatedEnum {
-    DEPRECATED_ZERO = 0;
+    option deprecated = true;
+    DEPRECATED_ZERO = 0 [deprecated = true];
     one = 1;
 }
 

csharp/src/Google.Protobuf.Test.TestProtos/UnittestIssues.cs

@@ -30,43 +30,44 @@ namespace UnitTest.Issues.TestProtos {
             "EiwKBXZhbHVlGAEgASgOMh0udW5pdHRlc3RfaXNzdWVzLk5lZ2F0aXZlRW51",
             "bRIxCgZ2YWx1ZXMYAiADKA4yHS51bml0dGVzdF9pc3N1ZXMuTmVnYXRpdmVF",
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-            "ZXByZWNhdGVkRmllbGRzTWVzc2FnZRIaCg5QcmltaXRpdmVWYWx1ZRgBIAEo",
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-            "YWx1ZRgDIAEoCzIgLnVuaXR0ZXN0X2lzc3Vlcy5EZXByZWNhdGVkQ2hpbGRC",
-            "AhgBEjoKDE1lc3NhZ2VBcnJheRgEIAMoCzIgLnVuaXR0ZXN0X2lzc3Vlcy5E",
-            "ZXByZWNhdGVkQ2hpbGRCAhgBEjYKCUVudW1WYWx1ZRgFIAEoDjIfLnVuaXR0",
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-            "dGVtRmllbGQSDAoEaXRlbRgBIAEoBSJECg1SZXNlcnZlZE5hbWVzEg0KBXR5",
-            "cGVzGAEgASgFEhIKCmRlc2NyaXB0b3IYAiABKAUaEAoOU29tZU5lc3RlZFR5",
-            "cGUioAEKFVRlc3RKc29uRmllbGRPcmRlcmluZxITCgtwbGFpbl9pbnQzMhgE",
-            "IAEoBRITCglvMV9zdHJpbmcYAiABKAlIABISCghvMV9pbnQzMhgFIAEoBUgA",
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-            "CW8yX3N0cmluZxgDIAEoCUgBQgQKAm8xQgQKAm8yIksKDFRlc3RKc29uTmFt",
-            "ZRIMCgRuYW1lGAEgASgJEhkKC2Rlc2NyaXB0aW9uGAIgASgJUgRkZXNjEhIK",
-            "BGd1aWQYAyABKAlSBGV4aWQifwoMT25lb2ZNZXJnaW5nEg4KBHRleHQYASAB",
-            "KAlIABI2CgZuZXN0ZWQYAiABKAsyJC51bml0dGVzdF9pc3N1ZXMuT25lb2ZN",
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-            "KAVCBwoFdmFsdWUiawoWTnVsbFZhbHVlT3V0c2lkZVN0cnVjdBIWCgxzdHJp",
-            "bmdfdmFsdWUYASABKAlIABIwCgpudWxsX3ZhbHVlGAIgASgOMhouZ29vZ2xl",
-            "LnByb3RvYnVmLk51bGxWYWx1ZUgAQgcKBXZhbHVlIkUKE051bGxWYWx1ZU5v",
-            "dEluT25lb2YSLgoKbnVsbF92YWx1ZRgCIAEoDjIaLmdvb2dsZS5wcm90b2J1",
-            "Zi5OdWxsVmFsdWUiYAoXTWl4ZWRSZWd1bGFyQW5kT3B0aW9uYWwSFQoNcmVn",
-            "dWxhcl9maWVsZBgBIAEoCRIbCg5vcHRpb25hbF9maWVsZBgCIAEoCUgAiAEB",
-            "QhEKD19vcHRpb25hbF9maWVsZCI5ChJPbmVvZldpdGhOb25lRmllbGQSCwoB",
-            "eBgBIAEoCUgAEg4KBG5vbmUYAiABKAlIAEIGCgR0ZXN0IjUKEU9uZW9mV2l0",
-            "aE5vbmVOYW1lEgsKAXgYASABKAlIABILCgF5GAIgASgJSABCBgoEbm9uZSKT",
-            "AgoZRGlzYW1iaWd1YXRlQ29tbW9uTWVtYmVycxIjChtkaXNhbWJpZ3VhdGVf",
-            "Y29tbW9uX21lbWJlcnMYASABKAUSDQoFdHlwZXMYAiABKAUSEgoKZGVzY3Jp",
-            "cHRvchgDIAEoBRIOCgZlcXVhbHMYBCABKAUSEQoJdG9fc3RyaW5nGAUgASgF",
-            "EhUKDWdldF9oYXNoX2NvZGUYBiABKAUSEAoId3JpdGVfdG8YByABKAUSDQoF",
-            "Y2xvbmUYCCABKAUSFgoOY2FsY3VsYXRlX3NpemUYCSABKAUSEgoKbWVyZ2Vf",
-            "ZnJvbRgKIAEoBRIXCg9vbl9jb25zdHJ1Y3Rpb24YCyABKAUSDgoGcGFyc2Vy",
-            "GAwgASgFKlUKDE5lZ2F0aXZlRW51bRIWChJORUdBVElWRV9FTlVNX1pFUk8Q",
-            "ABIWCglGaXZlQmVsb3cQ+///////////ARIVCghNaW51c09uZRD/////////",
-            "//8BKi4KDkRlcHJlY2F0ZWRFbnVtEhMKD0RFUFJFQ0FURURfWkVSTxAAEgcK",
-            "A29uZRABQh2qAhpVbml0VGVzdC5Jc3N1ZXMuVGVzdFByb3Rvc2IGcHJvdG8z"));
+            "dWVzLk5lZ2F0aXZlRW51bUICEAEiFQoPRGVwcmVjYXRlZENoaWxkOgIYASK5",
+            "AgoXRGVwcmVjYXRlZEZpZWxkc01lc3NhZ2USGgoOUHJpbWl0aXZlVmFsdWUY",
+            "ASABKAVCAhgBEhoKDlByaW1pdGl2ZUFycmF5GAIgAygFQgIYARI6CgxNZXNz",
+            "YWdlVmFsdWUYAyABKAsyIC51bml0dGVzdF9pc3N1ZXMuRGVwcmVjYXRlZENo",
+            "aWxkQgIYARI6CgxNZXNzYWdlQXJyYXkYBCADKAsyIC51bml0dGVzdF9pc3N1",
+            "ZXMuRGVwcmVjYXRlZENoaWxkQgIYARI2CglFbnVtVmFsdWUYBSABKA4yHy51",
+            "bml0dGVzdF9pc3N1ZXMuRGVwcmVjYXRlZEVudW1CAhgBEjYKCUVudW1BcnJh",
+            "eRgGIAMoDjIfLnVuaXR0ZXN0X2lzc3Vlcy5EZXByZWNhdGVkRW51bUICGAEi",
+            "GQoJSXRlbUZpZWxkEgwKBGl0ZW0YASABKAUiRAoNUmVzZXJ2ZWROYW1lcxIN",
+            "CgV0eXBlcxgBIAEoBRISCgpkZXNjcmlwdG9yGAIgASgFGhAKDlNvbWVOZXN0",
+            "ZWRUeXBlIqABChVUZXN0SnNvbkZpZWxkT3JkZXJpbmcSEwoLcGxhaW5faW50",
+            "MzIYBCABKAUSEwoJbzFfc3RyaW5nGAIgASgJSAASEgoIbzFfaW50MzIYBSAB",
+            "KAVIABIUCgxwbGFpbl9zdHJpbmcYASABKAkSEgoIbzJfaW50MzIYBiABKAVI",
+            "ARITCglvMl9zdHJpbmcYAyABKAlIAUIECgJvMUIECgJvMiJLCgxUZXN0SnNv",
+            "bk5hbWUSDAoEbmFtZRgBIAEoCRIZCgtkZXNjcmlwdGlvbhgCIAEoCVIEZGVz",
+            "YxISCgRndWlkGAMgASgJUgRleGlkIn8KDE9uZW9mTWVyZ2luZxIOCgR0ZXh0",
+            "GAEgASgJSAASNgoGbmVzdGVkGAIgASgLMiQudW5pdHRlc3RfaXNzdWVzLk9u",
+            "ZW9mTWVyZ2luZy5OZXN0ZWRIABoeCgZOZXN0ZWQSCQoBeBgBIAEoBRIJCgF5",
+            "GAIgASgFQgcKBXZhbHVlImsKFk51bGxWYWx1ZU91dHNpZGVTdHJ1Y3QSFgoM",
+            "c3RyaW5nX3ZhbHVlGAEgASgJSAASMAoKbnVsbF92YWx1ZRgCIAEoDjIaLmdv",
+            "b2dsZS5wcm90b2J1Zi5OdWxsVmFsdWVIAEIHCgV2YWx1ZSJFChNOdWxsVmFs",
+            "dWVOb3RJbk9uZW9mEi4KCm51bGxfdmFsdWUYAiABKA4yGi5nb29nbGUucHJv",
+            "dG9idWYuTnVsbFZhbHVlImAKF01peGVkUmVndWxhckFuZE9wdGlvbmFsEhUK",
+            "DXJlZ3VsYXJfZmllbGQYASABKAkSGwoOb3B0aW9uYWxfZmllbGQYAiABKAlI",
+            "AIgBAUIRCg9fb3B0aW9uYWxfZmllbGQiOQoST25lb2ZXaXRoTm9uZUZpZWxk",
+            "EgsKAXgYASABKAlIABIOCgRub25lGAIgASgJSABCBgoEdGVzdCI1ChFPbmVv",
+            "ZldpdGhOb25lTmFtZRILCgF4GAEgASgJSAASCwoBeRgCIAEoCUgAQgYKBG5v",
+            "bmUikwIKGURpc2FtYmlndWF0ZUNvbW1vbk1lbWJlcnMSIwobZGlzYW1iaWd1",
+            "YXRlX2NvbW1vbl9tZW1iZXJzGAEgASgFEg0KBXR5cGVzGAIgASgFEhIKCmRl",
+            "c2NyaXB0b3IYAyABKAUSDgoGZXF1YWxzGAQgASgFEhEKCXRvX3N0cmluZxgF",
+            "IAEoBRIVCg1nZXRfaGFzaF9jb2RlGAYgASgFEhAKCHdyaXRlX3RvGAcgASgF",
+            "Eg0KBWNsb25lGAggASgFEhYKDmNhbGN1bGF0ZV9zaXplGAkgASgFEhIKCm1l",
+            "cmdlX2Zyb20YCiABKAUSFwoPb25fY29uc3RydWN0aW9uGAsgASgFEg4KBnBh",
+            "cnNlchgMIAEoBSpVCgxOZWdhdGl2ZUVudW0SFgoSTkVHQVRJVkVfRU5VTV9a",
+            "RVJPEAASFgoJRml2ZUJlbG93EPv//////////wESFQoITWludXNPbmUQ////",
+            "////////ASo2Cg5EZXByZWNhdGVkRW51bRIXCg9ERVBSRUNBVEVEX1pFUk8Q",
+            "ABoCCAESBwoDb25lEAEaAhgBQh2qAhpVbml0VGVzdC5Jc3N1ZXMuVGVzdFBy",
+            "b3Rvc2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.StructReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::UnitTest.Issues.TestProtos.NegativeEnum), typeof(global::UnitTest.Issues.TestProtos.DeprecatedEnum), }, null, new pbr::GeneratedClrTypeInfo[] {
@@ -97,7 +98,9 @@ namespace UnitTest.Issues.TestProtos {
     [pbr::OriginalName("MinusOne")] MinusOne = -1,
   }
 
+  [global::System.ObsoleteAttribute]
   public enum DeprecatedEnum {
+    [global::System.ObsoleteAttribute]
     [pbr::OriginalName("DEPRECATED_ZERO")] DeprecatedZero = 0,
     [pbr::OriginalName("one")] One = 1,
   }
@@ -826,6 +829,7 @@ namespace UnitTest.Issues.TestProtos {
 
   }
 
+  [global::System.ObsoleteAttribute]
   public sealed partial class DeprecatedChild : pb::IMessage<DeprecatedChild>
   #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
       , pb::IBufferMessage

csharp/src/Google.Protobuf.Test/DeprecatedMemberTest.cs

@@ -34,7 +34,9 @@ using System;
 using System.Reflection;
 using Google.Protobuf.TestProtos;
 using NUnit.Framework;
+using UnitTest.Issues.TestProtos;
 
+#pragma warning disable CS0612 // Type or member is obsolete
 namespace Google.Protobuf
 {
     public class DeprecatedMemberTest
@@ -46,9 +48,20 @@ namespace Google.Protobuf
         }
 
         [Test]
-        public void TestDepreatedPrimitiveValue()
-        {
-            AssertIsDeprecated(typeof(TestDeprecatedFields).GetProperty("DeprecatedInt32"));
-        }
+        public void TestDepreatedPrimitiveValue() =>
+            AssertIsDeprecated(typeof(TestDeprecatedFields).GetProperty(nameof(TestDeprecatedFields.DeprecatedInt32)));
+
+        [Test]
+        public void TestDeprecatedMessage() =>
+            AssertIsDeprecated(typeof(DeprecatedChild));
+
+        [Test]
+        public void TestDeprecatedEnum() =>
+            AssertIsDeprecated(typeof(DeprecatedEnum));
+
+        [Test]
+        public void TestDeprecatedEnumValue() =>
+            AssertIsDeprecated(typeof(DeprecatedEnum).GetField(nameof(DeprecatedEnum.DeprecatedZero)));
     }
 }
+#pragma warning restore CS0612 // Type or member is obsolete

src/google/protobuf/compiler/csharp/csharp_enum.cc

@@ -61,6 +61,9 @@ EnumGenerator::~EnumGenerator() {
 
 void EnumGenerator::Generate(io::Printer* printer) {
   WriteEnumDocComment(printer, descriptor_);
+  if (descriptor_->options().deprecated()) {
+    printer->Print("[global::System.ObsoleteAttribute]\n");
+  }
   printer->Print("$access_level$ enum $name$ {\n",
                  "access_level", class_access_level(),
                  "name", descriptor_->name());
@@ -69,6 +72,9 @@ void EnumGenerator::Generate(io::Printer* printer) {
   std::set<int> used_number;
   for (int i = 0; i < descriptor_->value_count(); i++) {
       WriteEnumValueDocComment(printer, descriptor_->value(i));
+      if (descriptor_->value(i)->options().deprecated()) {
+        printer->Print("[global::System.ObsoleteAttribute]\n");
+      }
       std::string original_name = descriptor_->value(i)->name();
       std::string name =
           GetEnumValueName(descriptor_->name(), descriptor_->value(i)->name());