Add System.Private.CoreLib shared sources (#12162)

Taken from corefx commit 5956ad35864352b38c53aa8c2d1ce012c96b168d. Subsequent updates will happen via a mirroring bot.

1 files changed, 25 insertions, 0 deletions

diff --git a/netcore/System.Private.CoreLib/shared/System/Diagnostics/Tracing/TraceLogging/EventIgnoreAttribute.cs b/netcore/System.Private.CoreLib/shared/System/Diagnostics/Tracing/TraceLogging/EventIgnoreAttribute.cs
new file mode 100644
index 00000000000..769345f78e0
--- /dev/null
+++ b/netcore/System.Private.CoreLib/shared/System/Diagnostics/Tracing/TraceLogging/EventIgnoreAttribute.cs
@@ -0,0 +1,25 @@
+// 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;
+
+#if ES_BUILD_STANDALONE
+namespace Microsoft.Diagnostics.Tracing
+#else
+namespace System.Diagnostics.Tracing
+#endif
+{
+    /// <summary>
+    /// Used when authoring types that will be passed to EventSource.Write.
+    /// By default, EventSource.Write will write all of an object's public
+    /// properties to the event payload. Apply [EventIgnore] to a public
+    /// property to prevent EventSource.Write from including the property in
+    /// the event.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Property)]
+    public class EventIgnoreAttribute
+        : Attribute
+    {
+    }
+}