1 files changed, 55 insertions, 0 deletions
diff --git a/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Diagnostics.md b/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Diagnostics.md
new file mode 100644
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+++ b/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Diagnostics.md
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+# System.Diagnostics
+
+``` diff
+ namespace System.Diagnostics {
+     public class DiagnosticListener : DiagnosticSource, IDisposable, IObservable<KeyValuePair<string, object?>> {
+-        public override void Write(string name, object? value);
++        [RequiresDynamicCodeAttribute("DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
++        public override void Write(string name, object? value);
+     }
+     public abstract class DiagnosticSource {
+-        public Activity StartActivity(Activity activity, object? args);
++        [RequiresDynamicCodeAttribute("DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
++        public Activity StartActivity(Activity activity, object? args);
+-        public void StopActivity(Activity activity, object? args);
++        [RequiresDynamicCodeAttribute("DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
++        public void StopActivity(Activity activity, object? args);
+-        public abstract void Write(string name, object? value);
++        [RequiresDynamicCodeAttribute("DiagnosticSource may require creating new generic types or methods, which requires creating code at runtime. This may not work when AOT compiling.")]
++        public abstract void Write(string name, object? value);
+     }
++    public sealed class InitializingSwitchEventArgs : EventArgs {
++        public InitializingSwitchEventArgs(Switch @switch);
++        public Switch Switch { get; }
++    }
++    public sealed class InitializingTraceSourceEventArgs : EventArgs {
++        public InitializingTraceSourceEventArgs(TraceSource traceSource);
++        public TraceSource TraceSource { get; }
++        public bool WasInitialized { get; set; }
++    }
+     public class Process : Component, IDisposable {
+-        [UnsupportedOSPlatformAttribute("ios")]
+-        [UnsupportedOSPlatformAttribute("tvos")]
+-        public TimeSpan PrivilegedProcessorTime { get; }
++        [SupportedOSPlatformAttribute("maccatalyst")]
++        [UnsupportedOSPlatformAttribute("ios")]
++        [UnsupportedOSPlatformAttribute("tvos")]
++        public TimeSpan PrivilegedProcessorTime { get; }
+     }
+     public abstract class Switch {
++        public string DefaultValue { get; }
+-        protected string Value { get; set; }
++        public string Value { get; set; }
++        public static event EventHandler<InitializingSwitchEventArgs>? Initializing;
++        public void Refresh();
+     }
+     public sealed class Trace {
++        public static event EventHandler Refreshing;
+     }
+     public class TraceSource {
++        public SourceLevels DefaultLevel { get; }
++        public static event EventHandler<InitializingTraceSourceEventArgs>? Initializing;
+     }
+ }
+```
+