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Fix ComponentStatePersistenceManager iteration to prevent AntiforgeryValidationException in Blazor WASM #63674

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Merged
merged 3 commits into from
Sep 16, 2025
+54 −1
Merged

Fix ComponentStatePersistenceManager iteration to prevent AntiforgeryValidationException in Blazor WASM #63674

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Copilot Sep 13, 2025
9f60b5e
Fix ComponentStatePersistenceManager to iterate backwards in InferRen…
Copilot Sep 13, 2025
590aaa5
Add unit test for ComponentStatePersistenceManager callback removal d…
Copilot Sep 16, 2025
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8 changes: 7 additions & 1 deletion src/Components/Components/src/PersistentState/ComponentStatePersistenceManager.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -172,7 +172,13 @@ public void SetPlatformRenderMode(IComponentRenderMode renderMode)

private void InferRenderModes(Renderer renderer)
{
for (var i = 0; i < _registeredCallbacks.Count; i++)
// We are iterating backwards to allow the callbacks to remove themselves from the list.
// Otherwise, we would have to make a copy of the list to avoid running into situations
// where we don't run all the callbacks because the count of the list changed while we
// were iterating over it.
// It is not allowed to register a callback while we are persisting the state, so we don't
// need to worry about new callbacks being added to the list.
for (var i = _registeredCallbacks.Count - 1; i >= 0; i--)
{
var registration = _registeredCallbacks[i];
if (registration.RenderMode != null)
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