1 files changed, 73 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Diagnostics/Eventing/TraceLogging/EventFieldAttribute.cs b/src/mscorlib/src/System/Diagnostics/Eventing/TraceLogging/EventFieldAttribute.cs
new file mode 100644
index 0000000000..0b896b7fcf
--- /dev/null
+++ b/src/mscorlib/src/System/Diagnostics/Eventing/TraceLogging/EventFieldAttribute.cs
@@ -0,0 +1,73 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+using System;
+
+#if ES_BUILD_STANDALONE
+namespace Microsoft.Diagnostics.Tracing
+#else
+namespace System.Diagnostics.Tracing
+#endif
+{
+    /// <summary>
+    /// Tags are flags that are not interpreted by EventSource but are passed along
+    /// to the EventListener. The EventListener determines the semantics of the flags.
+    /// </summary>
+    [Flags]
+    public enum EventFieldTags
+    {
+        /// <summary>
+        /// No special traits are added to the field.
+        /// </summary>
+        None = 0,
+
+        /* Bits below 0x10000 are available for any use by the provider. */
+        /* Bits at or above 0x10000 are reserved for definition by Microsoft. */
+    }
+
+    /// <summary>
+    /// TraceLogging: used when authoring types that will be passed to EventSource.Write.
+    /// Controls how a field or property is handled when it is written as a
+    /// field in a TraceLogging event. Apply this attribute to a field or
+    /// property if the default handling is not correct. (Apply the
+    /// TraceLoggingIgnore attribute if the property should not be
+    /// included as a field in the event.)
+    /// The default for Name is null, which means that the name of the
+    /// underlying field or property will be used as the event field's name.
+    /// The default for PiiTag is 0, which means that the event field does not
+    /// contain personally-identifiable information.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Property)]
+    public class EventFieldAttribute
+        : Attribute
+    {
+        /// <summary>
+        /// User defined options for the field. These are not interpreted by the EventSource
+        /// but are available to the Listener. See EventFieldSettings for details
+        /// </summary>
+        public EventFieldTags Tags
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the name to use for the field. This defaults to null.
+        /// If null, the name of the corresponding property will be used
+        /// as the event field's name.
+        /// </summary>
+        internal string Name
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets a field formatting hint.
+        /// </summary>
+        public EventFieldFormat Format
+        {
+            get;
+            set;
+        }
+    }
+}