Allow trailing commas in workload set json

Author: dsplaisted

src/Resolvers/Microsoft.NET.Sdk.WorkloadManifestReader/WorkloadSet.cs

@@ -71,7 +71,12 @@ public static WorkloadSet FromDictionaryForJson(IDictionary<string, string> dict
         public static WorkloadSet FromJson(string json, SdkFeatureBand defaultFeatureBand)
         {
 #if USE_SYSTEM_TEXT_JSON
-            return FromDictionaryForJson(JsonSerializer.Deserialize<IDictionary<string, string>>(json)!, defaultFeatureBand);
+            var jsonSerializerOptions = new JsonSerializerOptions()
+            {
+                AllowTrailingCommas = true,
+                ReadCommentHandling = JsonCommentHandling.Skip
+            };
+            return FromDictionaryForJson(JsonSerializer.Deserialize<IDictionary<string, string>>(json, jsonSerializerOptions)!, defaultFeatureBand);
 #else
             return FromDictionaryForJson(JsonConvert.DeserializeObject<IDictionary<string, string>>(json)!, defaultFeatureBand);
 #endif

src/Tests/Microsoft.NET.Sdk.WorkloadManifestReader.Tests/SdkDirectoryWorkloadManifestProviderTests.cs

@@ -202,6 +202,32 @@ var sdkDirectoryWorkloadManifestProvider
                 .BeEquivalentTo("ios: 11.0.2/8.0.100", "android: 33.0.2-rc.1/8.0.200", "maui: 15.0.1-rc.456/8.0.200-rc.2");
         }
 
+
+        [Fact]
+        public void WorkloadSetCanHaveTrailingCommasInJson()
+        {
+            Initialize("8.0.200");
+
+            CreateMockManifest(_manifestRoot, "8.0.100", "ios", "11.0.2", true);
+            CreateMockManifest(_manifestRoot, "8.0.200", "android", "33.0.2-rc.1", true);
+            CreateMockManifest(_manifestRoot, "8.0.200-rc.2", "maui", "15.0.1-rc.456", true);
+
+            CreateMockWorkloadSet(_manifestRoot, "8.0.200", "8.0.200", """
+                {
+                "ios": "11.0.2/8.0.100",
+                "android": "33.0.2-rc.1/8.0.200",
+                "maui": "15.0.1-rc.456/8.0.200-rc.2",
+                }
+                """);
+
+            var sdkDirectoryWorkloadManifestProvider
+                = new SdkDirectoryWorkloadManifestProvider(sdkRootPath: _fakeDotnetRootDirectory, sdkVersion: "8.0.200", userProfileDir: null, globalJsonPath: null);
+
+            GetManifestContents(sdkDirectoryWorkloadManifestProvider)
+                .Should()
+                .BeEquivalentTo("ios: 11.0.2/8.0.100", "android: 33.0.2-rc.1/8.0.200", "maui: 15.0.1-rc.456/8.0.200-rc.2");
+        }
+
         [Theory]
         [InlineData(false)]
         [InlineData(true)]