[Hot Reload] Do not attempt to apply empty deltas. (#63979)

tmat · web-flow · commit 9f5703514e48 · 2025-10-10T11:05:59.000-07:00
diff --git a/src/Components/WebAssembly/WebAssembly/src/HotReload/HotReloadAgent.cs b/src/Components/WebAssembly/WebAssembly/src/HotReload/HotReloadAgent.cs
@@ -118,6 +118,13 @@ public void ApplyDeltas(IEnumerable<UpdateDelta> deltas)
     {
         foreach (var delta in deltas)
         {
+            if (delta.MetadataDelta.Length == 0)
+            {
+                // When the debugger is attached the delta is empty.
+                // The client only calls to trigger metadata update handlers.
+                continue;
+            }
+
             Reporter.Report($"Applying delta to module {delta.ModuleId}.", AgentMessageSeverity.Verbose);
 
             foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())

Original file line number	Diff line number	Diff line change
`@@ -118,6 +118,13 @@ public void ApplyDeltas(IEnumerable<UpdateDelta> deltas)`
`118`	`118`	`{`
`119`	`119`	`foreach (var delta in deltas)`
`120`	`120`	`{`
	`121`	`+ if (delta.MetadataDelta.Length == 0)`
	`122`	`+ {`
	`123`	`+ // When the debugger is attached the delta is empty.`
	`124`	`+ // The client only calls to trigger metadata update handlers.`
	`125`	`+ continue;`
	`126`	`+ }`
	`127`	`+`
`121`	`128`	`Reporter.Report($"Applying delta to module {delta.ModuleId}.", AgentMessageSeverity.Verbose);`
`122`	`129`
`123`	`130`	`foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())`