dotnet / dotnet/aspnetcore

ObjectDisposedException in Blazor server rendered app

Open
#62,718 7 comments 0 reactions 1 assignee Claimed by @javiercn View on GitHub
area-blazor
Dominant language
C#
Stars
38.4k
Forks
10.9k
Avg merge
2d 6h
Merged PRs (30d)
290

Description

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

The error below is showing up in our app's error telemetry. It has happened 100 times in the last 7 days.

```
System.ObjectDisposedException: Cannot access a disposed object.
at Microsoft.AspNetCore.Components.RenderTree.ArrayBuilder`1.GrowBuffer(Int32 desiredCapacity)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InsertNewFrame(DiffContext& diffContext, Int32 newFrameIndex)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.ComputeDiff(Renderer renderer, RenderBatchBuilder batchBuilder, Int32 componentId, ArrayRange`1 oldTree, ArrayRange`1 newTree)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment, Exception& renderFragmentException)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
```

I'm guessing it happens in rare situations where something in Blazor (the circuit?) is aborted at the same time as rendering.

### Expected Behavior

If Blazor component is aborted while it is still running then I'd expect abort-related errors to be caught and ignored.

### Steps To Reproduce

I don't have a repo. Just error info and counts from telemetry.

### Exceptions (if any)

_No response_

### .NET Version

_No response_

### Anything else?

_No response_

Contributor guide

Open the contributing guide

Assessment

This issue has not been assessed yet.

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.