Imported Upstream version 2.0.0.11353upstream/2.0.0.11353

1 files changed, 64 insertions, 0 deletions

diff --git a/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/EnumerableTypeInfo.cs b/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/EnumerableTypeInfo.cs
new file mode 100644
index 0000000000..74a3fa27b2
--- /dev/null
+++ b/src/mscorlib/shared/System/Diagnostics/Tracing/TraceLogging/EnumerableTypeInfo.cs
@@ -0,0 +1,64 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+#if ES_BUILD_STANDALONE
+namespace Microsoft.Diagnostics.Tracing
+#else
+namespace System.Diagnostics.Tracing
+#endif
+{
+    internal sealed class EnumerableTypeInfo : TraceLoggingTypeInfo
+    {
+        private readonly TraceLoggingTypeInfo elementInfo;
+
+        public EnumerableTypeInfo(Type type, TraceLoggingTypeInfo elementInfo)
+            : base(type)
+        {
+            this.elementInfo = elementInfo;
+        }
+
+        public override void WriteMetadata(
+            TraceLoggingMetadataCollector collector,
+            string name,
+            EventFieldFormat format)
+        {
+            collector.BeginBufferedArray();
+            this.elementInfo.WriteMetadata(collector, name, format);
+            collector.EndBufferedArray();
+        }
+
+        public override void WriteData(TraceLoggingDataCollector collector, PropertyValue value)
+        {
+            var bookmark = collector.BeginBufferedArray();
+
+            var count = 0;
+            IEnumerable enumerable = (IEnumerable)value.ReferenceValue;
+            if (enumerable != null)
+            {
+                foreach (var element in enumerable)
+                {
+                    this.elementInfo.WriteData(collector, elementInfo.PropertyValueFactory(element));
+                    count++;
+                }
+            }
+
+            collector.EndBufferedArray(bookmark, count);
+        }
+
+        public override object GetData(object value)
+        {
+            var iterType = (IEnumerable)value;
+            List<object> serializedEnumerable = new List<object>();
+            foreach (var element in iterType)
+            {
+                serializedEnumerable.Add(elementInfo.GetData(element));
+            }
+            return serializedEnumerable.ToArray();
+        }
+    }
+}