Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/compmod/system/diagnostics/SourceSwitch.cs

@@ -0,0 +1,39 @@
+//------------------------------------------------------------------------------
+// <copyright file="SourceSwitch.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Collections;
+using System.Collections.Specialized;
+using System.Threading;
+using System.Security;
+using System.Security.Permissions;
+
+namespace System.Diagnostics {
+    public class SourceSwitch : Switch {
+        public SourceSwitch(string name) : base(name, String.Empty) {}
+
+        public SourceSwitch(string displayName, string defaultSwitchValue) 
+            : base(displayName, String.Empty, defaultSwitchValue) { }
+
+        public SourceLevels Level {
+            get {
+                return (SourceLevels) SwitchSetting;
+            }
+            [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
+            set {
+                SwitchSetting = (int) value;
+            }
+        }
+
+        public bool ShouldTrace(TraceEventType eventType) {
+            return (SwitchSetting & (int) eventType) != 0;
+        }
+
+        protected override void OnValueChanged() {
+            SwitchSetting = (int) Enum.Parse(typeof(SourceLevels), Value, true);
+        }
+    }
+}