Merge pull request #495 from Softeq/feature/weak-lambda-warning

Softeq · Oct 27, 2022 · d594506 · d594506
2 parents 28b2e59 + 462b080
commit d594506
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/Softeq.XToolkit.Common/Weak/WeakDelegate.cs b/Softeq.XToolkit.Common/Weak/WeakDelegate.cs
@@ -2,7 +2,9 @@
 // http://www.softeq.com
 
 using System;
+using System.Diagnostics;
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Runtime.ExceptionServices;
 
 namespace Softeq.XToolkit.Common.Weak
@@ -27,6 +29,7 @@ protected WeakDelegate(object? target, TDelegate @delegate)
                 return;
             }
 
+            AssertCompilerGeneratedTarget(@delegate);
             DelegateTargetReference = new WeakReference(@delegate.Target);
             if (!ReferenceEquals(@delegate.Target, target))
             {
@@ -137,5 +140,18 @@ protected T TryExecuteWeakDelegate<T>(params object?[] parameters)
                 ? DelegateTargetReference?.Target
                 : null;
         }
+
+        [Conditional("DEBUG")]
+        private static void AssertCompilerGeneratedTarget(TDelegate @delegate)
+        {
+            var isCompilerGenerated = @delegate.Target.GetType().GetCustomAttribute<CompilerGeneratedAttribute>() != null;
+            if (!isCompilerGenerated)
+            {
+                return;
+            }
+
+            Debug.WriteLine("WeakDelegate's target is compiler-generated, it might be garbage-collected");
+            Debug.WriteLine(Environment.StackTrace);
+        }
     }
 }