Error boundaries #30874

SteveSandersonMS · 2021-03-12T15:05:33Z

Implements #26953 as per the design at #30940.

This is a nontrivial feature but hopefully you'll find the implementation size isn't unreasonable. The differences since the previous design review are:

Accounted for the API changes suggested (e.g., removed AutoRecover, replaced with new Recover method, and added an overridable OnErrorAsync for subclasses to do whatever they want with)
Made it easier to customize the error UI. There are now three options:
1. At a particular usage site, pass an ErrorContent fragment to your error boundary
2. For a simple global default, modify the blazor-error-boundary CSS rule. This is enough to provide static content like an icon, some fixed text, and your chosen colors.
3. For a more sophisticated global default, subclass ErrorBoundary and render whatever you want.
Accounted for some subtle cases, e.g., multiple concurrent errors and errors that happen after disposal. These are actually quite difficult to handle well and forced some fairly extensive changes to the error-loop-avoidance strategy.

Rather than writing up a lot more details here, I've updated the design proposal. So if you want context on all the behaviors covered here, please read through that again, especially the new parts like "Errors after disposal".

Let's watch out for perf

I am concerned that adding extra try/catch blocks within the perf-critical rendering internals might have a meaningful impact on rendering performance on WebAssembly. If I recall correctly, the WebAssembly runtime still goes through a JavaScript trampoline for each try/catch. @pranavkm If you know the latest details on how the per-PR-benchmarking works, it would be great to know how to check the impact this PR is having.

…efore we notify them. Also think about infinite error loops.

captainsafia · 2021-04-07T15:30:42Z

src/Components/Components/src/ErrorBoundaryBase.cs

+        /// The maximum number of errors that can be handled. If more errors are received,
+        /// they will be treated as fatal. Calling <see cref="Recover"/> resets the count.
+        /// </summary>
+        [Parameter] public int MaximumErrorCount { get; set; } = 100;


Do we need this to be public if we're only using it to determine whether logic in ErrorContent is causing an infinite stream of exceptions? It's not clear to me why we would want users to be able to customize it if we can set a sensible default.

It's certainly open for debate. A developer might, for example, have a list with 101 items and want to be able to tolerate the case where every item fails independently, so they might have a reason to increase this number.

The tradeoff with bigger values is that there's more processing and more log messages generated before we eventually stop the process. I'm not sure there would be a single value that would be ideal for all cases.

captainsafia · 2021-04-07T15:37:00Z

src/Components/Components/src/IErrorBoundary.cs

+
+namespace Microsoft.AspNetCore.Components
+{
+    // Purpose of this interface, instead of just using ErrorBoundaryBase directly:


I like the code comments you've added here and elsewhere. Good stuff!

captainsafia · 2021-04-07T15:43:21Z

src/Components/Components/src/Rendering/ComponentState.cs

+        // This should not be called from anywhere except SetDirectParameters or NotifyCascadingValueChanged.
+        // Those two methods know how to correctly combine both cascading and non-cascading parameters to supply
+        // a consistent set to the recipient.
+        private void SupplyCombinedParameters(ParameterView directAndCascadingParameters)


Is this change related to the error boundaries work or general goodness?

It's to bring the "normal params" and "cascaded params" code paths into a common place so they can share the same interactions with error boundaries (the call to AddToPendingTasks which supplies an owningComponentState, which in turn determines how we route to the correct error boundary).

captainsafia · 2021-04-07T15:45:15Z

src/Components/Web/src/Web/ErrorBoundary.cs

+                //     whether DetailedErrors is enabled and whether you're in production, because even on WebAssembly
+                //     you likely don't want to put technical data like that in the UI for end users. A reasonable way
+                //     to toggle this is via something like "#if DEBUG" but that can only be done in user code.
+                // [2] We can't have any other human-readable content by default, because it would need to be valid


javiercn

Here is some initial feedback

javiercn · 2021-04-08T12:10:54Z

src/Components/test/testassets/BasicTestApp/ErrorBoundaryTest/DelayedErrorCausingChild.razor

+    {
+        if (ThrowOnParametersSetAsync)
+        {
+            await Task.Delay(500);


Task.Yield should suffice here, isn't it?

I wanted to guarantee that next render goes through and into the DOM before the .NET side continues, even to the extent that it's observable to a human (who is paying close attention) when running the scenario manually in their browser. This eliminates any unclarity about the order of operations within the test, versus having to reason about the exact order in which they were queued.

Fair enough

javiercn · 2021-04-08T12:21:25Z

src/Components/Components/test/RendererTest.cs

@@ -4170,6 +4170,241 @@ public async Task ThrowsIfComponentProducesInvalidRenderTree()
            Assert.StartsWith($"Render output is invalid for component of type '{typeof(TestComponent).FullName}'. A frame of type 'Element' was left unclosed.", ex.Message);


For the future: We should break this file into more than one class. It has 5K lines and it's easily dismissed in CRs and hard to maintain review.

javiercn · 2021-04-08T13:16:48Z

src/Components/Server/src/Circuits/RemoteErrorBoundaryLogger.cs

+                var message = _options.DetailedErrors
+                    ? exception.ToString()
+                    : $"For more details turn on detailed exceptions in '{nameof(CircuitOptions)}.{nameof(CircuitOptions.DetailedErrors)}'";
+                return _jsRuntime.InvokeVoidAsync("console.error", message);


Should this do

aspnetcore/src/Components/Server/src/ComponentHub.cs

Line 288 in a5864bb

private static Task NotifyClientError(IClientProxy client, string error) => client.SendAsync("JS.Error", error);

instead?

No, JS.Error is for fatal exceptions (it shows the yellow bar of death). We could add a whole new message name for nonfatal errors, but I didn't see any reason to do so, since console.error already has exactly the desired behavior and is all that our new handler would call anyway.

We're always free to change how this message gets passed to JS in the future if a reason emerges.

Sounds good!

javiercn · 2021-04-08T13:20:03Z

src/Components/Web/src/Web/ErrorBoundary.cs

+        protected override async Task OnErrorAsync(Exception exception)
+        {
+            await ErrorBoundaryLogger!.LogErrorAsync(exception);
+        }


I think we should reconsider this and make it synchronous. Making it asynchronous introduces an unnecessary level of complexity and I can't think of scenarios in which this is useful, we do fire and forget for logging in other places and it should be doable here.

Seems like a pros and cons thing. I did start with synchronous only, but switched to allow async because:

The total amount of implementation complexity this adds for us is pretty modest (it's these lines)

If we can make it easier for a developer to do async logging right, why wouldn't we? If we don't do it, we're just pushing the responsibility across to developers, who might not have a good sense of how to cause async errors to show up anywhere.

If people don't need async, it's very easy for them to do sync-only operations within this. Whereas the inverse is not true. And if we eventually had to have both OnError and OnErrorAsync, that's certainly more conceptual weight.

If you feel really strongly please say so, otherwise I'd err on the side of being flexible for developers here.

And if we eventually had to have both OnError and OnErrorAsync, that's certainly more conceptual weight.

That's the main reason I can think of, however for me the drawback is having to think about async errors that might happen within the errorboundary OnErrorAsync

I don't feel strongly about it, I just thought it was worth a conversation.

javiercn · 2021-04-08T13:23:08Z

src/Components/Web/src/Web/ErrorBoundary.cs

+                //     for all languages.
+                // Instead, the default project template provides locale-specific default content via CSS. This provides
+                // a quick form of customization even without having to subclass this component.
+                builder.OpenElement(2, "div");


What would a developer need to do to make this accessible? (Since we don't put any content)

We do add content by default in the project template via CSS. I would expect screen readers to honour that in the same way they read out any other text displayed in the document.

If an application has more requirements than that, they need to either supply ErrorContent or subclass ErrorBoundary.

javiercn · 2021-04-08T13:37:09Z

src/Components/Components/src/RenderTree/Renderer.cs

@@ -28,6 +29,7 @@ public abstract partial class Renderer : IDisposable, IAsyncDisposable
    {
        private readonly IServiceProvider _serviceProvider;
        private readonly Dictionary<int, ComponentState> _componentStateById = new Dictionary<int, ComponentState>();
+        private readonly Dictionary<IComponent, ComponentState> _componentStateByComponent = new Dictionary<IComponent, ComponentState>();


I understand this dictionary is to facilitate the look up in the DispatchEventAsync and so on.
Would iterating over the ComponentState entries instead work?

The reason I'm bringing this up is because it implies more allocation and housekeeping we need to perform whether an exception happens or not, and by the time an exception happens (by definition) we are already in an "exceptional" state, so we shouldn't care about perf in that case.

From inspection this is only used in the event handler, so I think it might be better to avoid this dictionary all together and just iterate over the list of component state entries

Unfortunately that's not the case. We have to find the component state before beginning event dispatch in case it got disposed before the event handler completed, so we need to do this lookup on every incoming event.

Ahh, I see. Is it because of the async case where the error boundary might get disposed before the exception happens?

Yes, or if the receiver component gets disposed before its event handler raises an async exception, which is potentially pretty common (e.g., it happens every time if you have multiple children and more than one have async operations that fail, because the first error will cause the disposal of both, then the second error gets received).

javiercn · 2021-04-08T13:59:09Z

src/Components/Components/src/ErrorBoundaryBase.cs

+            // infinite error loop. Unfortunately it's very hard to distinguish whether the error source is "child content"
+            // or "error content", since the exceptions can be received asynchronously, arbitrarily long after we switched
+            // between normal and errored states. Without creating a very intricate coupling between ErrorBoundaryBase and
+            // Renderer internals, the obvious options are either:


We could "easily" determine this within the renderer and pass that info to the handler, isn't it?

The callsite for HandleException knows the handler and the source, so it can just compare them for reference equality and pass that information to handle exception (I think that's likely useful).

If we were todo that, then do we still need a limit on the number of exceptions? We could choose to say something like:

If the exception is not within the ErrorBoundary component handle it, otherwise throw?

It's not at all easy, as far as I know.

If the exception is not within the ErrorBoundary component handle it, otherwise throw?

Two counterexamples:

If the ErrorBoundary is not yet in an errored state (or has recovered), then the exceptions will be within it, and should not be fatal, so that would be a false positive

Even if the exception appears not to be from within the ErrorBoundary, that might be because some intermediate child has since been disposed, and in that case it might still be from the error content, so that would be a false negative

Fair enough, I don't have a deep enough intuition about this, so I'll trust your judgment (and the tests) here.

javiercn · 2021-04-08T14:48:56Z

src/Components/Components/test/RendererTest.cs

+                .GetComponentFrames<ErrorThrowingComponent>().Single().ComponentId;
+
+            // Act/Assert 1: No synchronous errors
+            exception = new InvalidTimeZoneException("Error during SetParametersAsync");


It might be good to have a comment here explaining that ErrorThrowingComponent doesn't throw if the exception is not set. It took me a while to understand the test.

javiercn · 2021-04-08T14:54:27Z

src/Components/Components/test/RendererTest.cs

-                    builder.OpenElement(s++, "p");
-                    builder.AddContent(s++, n);
+                    builder.OpenElement(0, "p");
+                    builder.AddContent(1, n);


This looks much cleaner!

src/Components/Components/test/RendererTest.cs

javiercn

Looks superb! Pretty solid changes.

Other than small pieces of feedback, it looks great!

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(Licence, Help wanted, Good first issue, Chat) * Use correct links * Update dependencies from https://github.com/dotnet/efcore build 20210329.1 (dotnet#31351) [main] Update dependencies from dotnet/efcore * Fix WebView header APIs and behavior (dotnet#31246) * Fix WebView header APIs and behavior - Change WebView to return dictionary of headers instead of strings (this is needed for Android) - Change StaticContentProvider to use filename (always exists) instead of physical file path (not always available) to determine MIME type - Fix WPF sample bug * Update dependencies from https://github.com/dotnet/efcore build 20210329.2 (dotnet#31352) [main] Update dependencies from dotnet/efcore * Update dependencies from https://github.com/dotnet/efcore build 20210327.1 (dotnet#31309) [release/6.0-preview3] Update dependencies from dotnet/efcore * Update dependencies from https://github.com/dotnet/runtime build 20210329.3 (dotnet#31363) [release/6.0-preview3] Update dependencies from dotnet/runtime * Refactor logging in generic classes (dotnet#31364) * Update dependencies from https://github.com/dotnet/efcore build 20210329.4 (dotnet#31366) [release/6.0-preview3] Update dependencies from dotnet/efcore * Update dependencies from https://github.com/dotnet/efcore build 20210329.3 (dotnet#31353) [main] Update dependencies from dotnet/efcore * Make RequestDelegateFactory public (was MapActionExpressionTreeBuilder) (dotnet#31171) * Make RequestDelegateBuilder public - Formerly known as MapActionExpressionTreeBuilder * Add new BuildRequestDelegate overloads * Address PR feedback * RequestDelegateBuilder -> RequestDelegateFactory * Build -> Create * Address final review feedback. * [Http] Remove some unsafe code and save a string allocation (dotnet#31267) * Use one shot pbkdf2 (dotnet#31200) * Use one shot pbkdf2 * Update NetCorePbkdf2Provider.cs * CR feedback * CR feedback * Fix * Just use GetBytes for now * Update NetCorePbkdf2Provider.cs * Use interned Header Names for known headers not in the pre-allocated block (dotnet#31311) * Use interned headernames for known headers not in the preallocated block * Switch Connection header values for interned values * Use interned strings for websockets * Keep baggage, tracestate, and traceparent with previous casing * Update src/Servers/Kestrel/shared/KnownHeaders.cs Co-authored-by: Chris Ross <Tratcher@Outlook.com> * Feedback Co-authored-by: Chris Ross <Tratcher@Outlook.com> * Revert global.json changes * Modify constructor * Remove IReceiveHotReloadContext and HotReloadContext (dotnet#31281) * Remove IReceiveHotReloadContext and HotReloadContext React to API review feedback. Substitute IReceiveHotReloadContext and HotReloadContext with RenderHandle.IsHotReloading * Fixup * Update src/Components/Components/src/RenderHandle.cs * Update src/Components/Components/src/Properties/ILLink.Substitutions.xml * Update src/Components/Components/src/Properties/ILLink.Substitutions.xml * Flow Kestrel CancellationTokens to BindAsync (dotnet#31377) * Update dependencies from https://github.com/dotnet/runtime build 20210329.5 (dotnet#31384) [main] Update dependencies from dotnet/runtime * [main] Update dependencies from dotnet/arcade (dotnet#31349) [main] Update dependencies from dotnet/arcade * Quarantine flaky test (dotnet#31389) * Clean up NetCore PBKDF2 provider. (dotnet#31391) * Update dependencies from https://github.com/dotnet/runtime build 20210330.7 (dotnet#31394) [release/6.0-preview3] Update dependencies from dotnet/runtime * Add a FeaturesCollection constructor that supports initial capacity (dotnet#31381) * Add a FeaturesCollection constructor that supports initial capacity * Raise authenticationFailed event when cert validation fails (dotnet#31370) * Unquarantine UseStartupFactoryWorks (dotnet#31297) * Update dependencies from https://github.com/dotnet/efcore build 20210330.1 (dotnet#31400) [release/6.0-preview3] Update dependencies from dotnet/efcore * Update dependencies from https://github.com/dotnet/efcore build 20210330.2 (dotnet#31401) [main] Update dependencies from dotnet/efcore * Fix generated CSS scopes in layout views and update templates (dotnet#31257) * Fix generated CSS scopes in layout views and update templates * Update template baselines * Enabled scoped CSS for MVC template tests * Bring back static CSS file * Quarantine ClosesAfterDataSent (dotnet#31405) * Update CONTRIBUTING.md (dotnet#31371) Removed tab that seemed to cause a paragraph about the new help wanted label to be in a code fence. * Support round trip serialization of AuthenticationProperties with System.Text.Json (dotnet#31330) dotnet#20722 * Update Microsoft.Net.Compilers.Toolset (dotnet#31403) * Improve test failures for unexpected logs (dotnet#31406) * Add ToString() to Testing's log WriteContext * Update StrictTestServerTests to only show unexpected log * Undo template change that induced flakiness (dotnet#31417) * Add helpful exception message when exception handler returns 404 (dotnet#31142) * Update dependencies from https://github.com/dotnet/runtime build 20210331.6 (dotnet#31421) [release/6.0-preview3] Update dependencies from dotnet/runtime * Do not serialize Parameters property on AuthenticationProperties (dotnet#31414) * Do not serialize Parameters Explicitly prevent the Parameters dictionary from being included in the deserialized payload. See dotnet#31330 (comment). * Ignore props backed by Items Also ignore the properties backed by the Items dictionary to minimise the size of the serialized JSON payload. * Add ignoreLineEndingDifferences Stop tests from failing on non-Windows OSs due to different line endings. * ArPow stage 1: local source-build infrastructure (dotnet#31235) Conflicts: eng/Version.Details.xml Co-authored-by: John Luo <johluo@microsoft.com> * [main] Update dependencies from dotnet/runtime dotnet/efcore (dotnet#31411) [main] Update dependencies from dotnet/runtime dotnet/efcore * Update dependencies from https://github.com/dotnet/efcore build 20210331.4 (dotnet#31424) [release/6.0-preview3] Update dependencies from dotnet/efcore * Fix project path in slnf (dotnet#31431) * Fix trailing comma in Caching.slnf (dotnet#31438) * Fix file headers in src/Caching (dotnet#31439) * [SignalR Java] Update to RxJava3 (dotnet#31426) * Fixed de-duping hosting startup assemblies (dotnet#31440) - De-dupe hosting startup assemblies based on assembly instance not the name of the assembly. Names can be short or long and we don't know if they resolve to the same assembly. Instead of trying to mess with names, we just check to make sure that the instance isn't the same. * Trim down framework references for Blazor dev server (dotnet#31420) * Only include Microsoft.AspNetCore.App framework reference for Blazor dev server * Address feedback from peer review * Use SharedFxVersion property * Cross-target last few projects to DefaultNetCoreTargetFramework (dotnet#31239) * Cross-target last 2 projects to DefaultNetCoreTargetFramework * More projects * Fixup * Fixup again * Fixup * Undo SiteExtension change * Update src/SiteExtensions/LoggingBranch/LB.csproj Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com> Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com> * [main] Update dependencies from dotnet/runtime dotnet/efcore (dotnet#31425) [main] Update dependencies from dotnet/runtime dotnet/efcore * Use integer division trick to get exact base64 length (dotnet#31442) * Add nullability to more MVC assemblies (dotnet#31338) * Add nullability to more MVC assemblies * [x] MVC.Cors * [x] Mvc.DataAnnotations * [x] Mvc.Localization * [x] Mvc.Newtonsoft.Json * [ ] Mvc.ViewFeatures (partial) * Fixup * Update src/Mvc/Mvc.ViewFeatures/src/Rendering/ViewContext.cs * Apply suggestions from code review * Update RazorPagePropertyActivator.cs * Update assembly check on EventHandlerTagHelperDescriptorProvider (dotnet#31458) * Remove legacy routing (dotnet#31295) * [release/6.0-preview3] Update dependencies from dotnet/runtime dotnet/efcore (dotnet#31451) [release/6.0-preview3] Update dependencies from dotnet/runtime dotnet/efcore * Update dependencies from https://github.com/dotnet/arcade build 20210331.6 (dotnet#31427) [main] Update dependencies from dotnet/arcade - Merge branch 'main' into darc-main-2c400715-e553-48d8-8d43-983dc7aa4b7d * Update dependencies from https://github.com/dotnet/efcore build 20210401.3 (dotnet#31468) [main] Update dependencies from dotnet/efcore * Fix project paths in Azure.slnf (dotnet#31435) * Fix project paths in Azure.slnf * Update Azure.slnf * Update IdentityModel versions to 6.10.0 dotnet#31454 (dotnet#31482) * Removed static activity source from hosting (dotnet#31483) * Removed static activity source from hosting - Get it from DI instead * Fixed test * Use Random.Shared property (dotnet#31453) * Use Random.Shared Use the new .NET 6 Random.Shared static property where possible. See dotnet/runtime#50297. * Revert WebApi-CSharp changes For some reason I don't understand, this template doesn't see Random.Shared when compiled so this reverts the previous change for this template. * Remove baseline suppressions from 5.0 (dotnet#29934) * Remove baseline suppressions from 5.0 * Use newer NuGet.Protocol version - v4.8.2 ➡️ v5.8.1 * Fix condition * Back to 5.8.1 * Undo components changes * Whoops * Whoops Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com> * Remove DNT from pre-reserved headers (dotnet#31493) No modern browser uses it anymore * Reuse HttpProtocol CTS (dotnet#31466) * Change Router _emptyParametersDictionary to a regular Dictionary (dotnet#31460) * Change Router _emptyParametersDictionary to a regular Dictionary This allows for ReadOnlyDictionary to be trimmed in a default Blazor WASM app. Saving roughly 3 KB .br compressed. Contributes to dotnet#30098 * Update src/Components/Components/src/Routing/Router.cs Co-authored-by: James Newton-King <james@newtonking.com> * Clean up some MVC code (dotnet#31511) * Clean up some MVC code * PR feedback * Do not throwing on InputBase.Dispose() if not in EditContext. (dotnet#31510) * Do not throwing on InputBase.Dispose() if not in EditContext. Fixes dotnet#30990 * Cache filters between requests in the ordinary case (dotnet#31513) In the normal case, * only the DefaultFilterFactoryProvider is registered * all filters registered by the framework are reusable We could so something targeted and cache filter instances between requests. * Update dependencies from https://github.com/dotnet/arcade build 20210403.1 (dotnet#31526) [main] Update dependencies from dotnet/arcade * Flaky tests (dotnet#31502) * Revert "Update assembly check on EventHandlerTagHelperDescriptorProvider (dotnet#31458)" (dotnet#31530) This reverts commit 7bc87ba. * Ability to deactivate DataAnnotationsValidation dynamically. Fixes dotnet#31027 (dotnet#31413) * Use UriHelper.BuildAbsolute for RedirectToHttpsRule (dotnet#28899) * Use UriHelper.BuildAbsolute and UriHelper.BuildRelative for RedirectRule (dotnet#28903) * Still send 100 Continue with null MinRequestBodyDataRate (dotnet#31543) * Update Selenium/Playwright (dotnet#31497) * Update Selenium/Playwright * Update selenium-config.json * Update Versions.props * Added VSCode debugging (for MvcSandbox) & code analysis support (dotnet#29486) * Added VSCode debugging support for MvcSandbox * Added ignored vscode folders * 1. Convered some more projects. 2. Added env variable for TargetFramework and used it in launch.json file rather than hardcoding TFW. * Addressed PR feedback. 1. Removed extensions.json 2. Updated BuildFromSource.md for Vscode instructions. 3. Added launch settings for BasicTestApp. * Addressed PR feedback! * Implement new SmallCapacityDictionary for dictionaries with a small amount of values. (dotnet#31360) * Fix duplicated event names in KestrelTrace logger. (dotnet#31523) (dotnet#31554) * Update area-owners.md (dotnet#31552) * Data Protection minor tidying (dotnet#31512) * Remove unused code Remove unused constant, method and variable. * Remove array allocations Use Array.Empty() instead of allocating an empty array. Use a static array for activation type instead of creating a new one per invocation. * Rename field Address PR feedback. * [SignalR TS] Improve connection error messages (dotnet#31402) * [MVC] Fix MSB4186 error (dotnet#31066) Fix MSB4186 error if a project references Microsoft.AspNetCore.Mvc.Testing that is not itself an ASP.NET project, such as a helper library in a test suite. * Re-use cancellation tokens in the https middleware (dotnet#31528) * Re-use cancellation tokens in the https middleware - These tokens are usually short lived and exist for the purposes of cancelling the handshake. * Fix IPNetwork.Contains behavior for prefixes which are not at start of subnet range (dotnet#31573) * Update branding to 5.0.6 (dotnet#31563) * Use skipEnabledCheck for LoggerMessage.Define (dotnet#31562) * Use skipEnabledCheck in MVC * Use skipEnabledCheck in Http/Routing DefaultLinkGenerator, DefaultLinkParser, and DfaMatcher * Use skipEnabledCheck in SignalR * Use skipEnabledCheck in Components * Use skipEnabledCheck in Hosting * Use skipEnabledCheck in Servers/HttpSys * Use skipEnabledCheck in Servers/Kestrel * Use skipEnabledCheck in Middleware * Avoid some allocations by checked IsEnabled first in MVC * Avoid some allocations by checked IsEnabled first in Servers/Kestrel * Simplify usage of logging in transports * Fix up typo in Blazor Server launchSettings.json (dotnet#31580) * Rename 'Blazor component' to 'component' to be more generic (dotnet#31590) Co-authored-by: Adrian Wright <adrian@compiledcoding.co.uk> * Update branding to 3.1.15 (dotnet#31577) * Update branding to 3.1.15 Update Ubuntu 16.04 to 18.04 * Remove obsolete groovy code * [release/5.0] Update nuget versions (dotnet#31490) * Update nuget/msbuild versions * Update nuget * Nuget only * Fix baseline, update to 5.8.1 * Undo test change * Update MetadataSerializerTest.cs * Set cab name for TargetingPack.wixproj (dotnet#30975) * Added IConnectionSocketFeature (dotnet#31588) - Removed the nullable from the Socket property as approved in API review - Make the IConnectionSocketFeature an additional feature instead of one implemented on the TransportConnection. - Added a test to verify it works * Fix null ref in SyntaxTokenCache (dotnet#30978) (dotnet#30988) Fixes dotnet#27154 * Still send 100 Continue with null MinRequestBodyDataRate (dotnet#31568) * [SignalR TS] Fix permanent Disconnecting state (dotnet#30948) (dotnet#31253) * Fix arguments order for call of HeartbeatSlow (dotnet#28698) (dotnet#31080) Co-authored-by: Roman Marusyk <Marusyk@users.noreply.github.com> * Quarantine one failing test (dotnet#31045) (dotnet#31296) - dotnet#31044 - `RazorPagesTemplate_RazorRuntimeCompilation_BuildsAndPublishes()` Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com> * Fix merge * Fix merge * Update HubConnection.Reconnect.test.ts * Update default-build.yml * Error boundaries (dotnet#30874) * Remove unused ADAL dependency (dotnet#31484) * Remove unused dependency * Remove outdated AAD sample * Custom event args: support receiving IJSObjectReference (dotnet#31591) * Add failing E2E case * Implement fix * Add E2E test * Update src/Components/test/testassets/BasicTestApp/EventCustomArgsComponent.razor * Update suppressions * [SignalR TS] Set keep alive timer in receive loop (dotnet#31300) * Unskip some fixed E2E tests (dotnet#31614) * Fix "no event handler" in simultaneous blur+removal case (dotnet#31612) * [SPA] Introduces new approach for proxying the SPA templates (dotnet#31564) * A new package Microsoft.AspNetCore.SpaProxy has been added that is used by the templates to launch their development proxy via npm/yarn. * The SPA development proxy for each CLI now is the frontend for the application and proxies the requests to the backend which is the ASP.NET Core application. * At publish time the application assets are copied to the wwwroot. * SpaServices.Extensions has been removed from the templates since it is no longer needed. MapFallbackToFile("index.html") handles unknown requests and serves the SPA entry point. * The templates have been updated to keep using HTTPS with the SPA proxy configured to use the ASP.NET Core HTTPS development certificate via a new aspnetcore-https.js file that ships within the template. * The configuration for angular has been updated with a proxy.conf.js file to proxy requests to the backend. * The entry point for the application in development is now https://localhost:5002 when using https and http://localhost:5002 otherwise. * Infer default sources for parameters of minimal actions (dotnet#31603) This does a big chunk of dotnet#30248 while heavily refactoring the RequestDelegateFactory by splitting it out into a bunch of smaller methods. For part 2 of dotnet#30248, a "scalar value type that lives in the System namespace", I went with the alternative of "Something convention-based like the presence of a bool TryParse(string, out T) method" instead. This conventions work for types in any namespace including user-defined types. * Avoid closure caused by local function (dotnet#31641) * Avoid closure caused by local function - Made the local function static and passed state via parameters. * Remove form support from minimal APIs (dotnet#31646) * Remove form support from minimal APIs * Add * MapActionSample -> MinimalSample * Remove MapActionSample.csproj from Mvc.slnf * [Templates] Update the react template to use the CLI proxy (dotnet#31652) Updates the react template to use the http-proxy-middleware for handling the requests instead of the asp.net core proxy in the same way it's done for the Angular template. * [SignalR] Allocate HubCallerClients once per connection (dotnet#31661) * [main] Update dependencies from dotnet/emsdk dotnet/efcore dotnet/runtime (dotnet#31576) [main] Update dependencies from dotnet/emsdk dotnet/efcore dotnet/runtime - Add `RemoveDevicePlatformSupport` To `Microsoft.AspNetCore.Authentication.Negotiate.csproj` Co-authored-by: dotnet-maestro[bot] <42748379+dotnet-maestro[bot]@users.noreply.github.com> Co-authored-by: Andre Milbradt <andremi@microsoft.com> Co-authored-by: Andre Milbradt <onegoodsausage@users.noreply.github.com> Co-authored-by: Pranav K <prkrishn@hotmail.com> Co-authored-by: Hao Kung <HaoK@users.noreply.github.com> Co-authored-by: David Fowler <davidfowl@gmail.com> Co-authored-by: Safia Abdalla <safia@microsoft.com> Co-authored-by: Kristian Hellang <kristian@hellang.com> Co-authored-by: msftbot[bot] <48340428+msftbot[bot]@users.noreply.github.com> Co-authored-by: James Newton-King <james@newtonking.com> Co-authored-by: Chris Ross <Tratcher@Outlook.com> Co-authored-by: Steve Sanderson <SteveSandersonMS@users.noreply.github.com> Co-authored-by: Kevin Pilch <kevinpi@microsoft.com> Co-authored-by: Javier Calvarro Nelson <jacalvar@microsoft.com> Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com> Co-authored-by: N. 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thirstyape · 2021-12-08T22:03:20Z

Am I using this incorrectly? I implemented as per Documentation in MainLayout.razor with the slight change that in my <ErrorContent> section I added a button that triggers errorBoundary?.Recover();.

My test involved throwing a generic exception with a message from a child component in protected override void OnInitialized(). The result was that instead of displaying the content of @Body or the ErrorContent, there was nothing. Upon opening the browser inspector I had an empty <main></main>.

I also tried creating a custom class that implemented ErrorBoundary, but this did not help either.

ghost · 2021-12-08T22:03:23Z

Hi @thirstyape. It looks like you just commented on a closed PR. The team will most probably miss it. If you'd like to bring something important up to their attention, consider filing a new issue and add enough details to build context.

ghost added the area-blazor Includes: Blazor, Razor Components label Mar 12, 2021

SteveSandersonMS force-pushed the stevesa/error-boundaries branch 2 times, most recently from c4ac7f3 to a40aed7 Compare March 19, 2021 15:11

runfoapp bot mentioned this pull request Mar 22, 2021

DNS outage impacting builds #31140

Closed

SteveSandersonMS added 22 commits April 6, 2021 09:28

Initial experiments

c0d3d59

Handle async event handler exceptions

952cac0

Test cases for lifecycle methods

4b12fc2

Handle SetParametersAsync exceptions

cc44e53

Handle IHandleAfterRender exceptions

5351089

Handle exceptions during rendering

4e7e3c5

Update notes about disposal

e6c1c1c

Add note about Attach

0d6acd7

Handle exceptions during cascading value notifications

2b35fe8

Update ErrorMaker.razor

42d1911

Add note about InvokeAsync

2f68770

Clean up some notes

80ebf30

Clarify what we do if the IErrorBoundary component itself has an error

83de667

Force error boundaries to clear up their descendants on error, even b…

2a5a7d3

…efore we notify them. Also think about infinite error loops.

More thoughts on error loops

0cd43ff

More thoughts

0a7a07f

Clean up all the stuff about detailed errors and prerendering

8089c36

Add PrerenderingErrorBoundaryLogger

4514899

Let error boundaries catch their own inline errors

2de4259

Redesign around ErrorBoundaryBase abstract base class.

415d8dd

Define IErrorBoundary as an internal interface for clarity

9529163

Minor fix

bf04cf3

SteveSandersonMS force-pushed the stevesa/error-boundaries branch from a40aed7 to bf04cf3 Compare April 6, 2021 08:30

SteveSandersonMS added 3 commits April 6, 2021 09:51

Handle logging errors

1db319e

Make it possible to customize the UI via subclassing ErrorBoundary

0415115

Better default UI

a28c3ca

SteveSandersonMS added 8 commits April 7, 2021 12:22

Add default error boundary content/style to project templates

0a61aaa

Fix server E2E tests

4955cc3

Test for custom error boundary

92e506b

Test for error ignorer

8f18c40

Test for inline errors

d151976

Test for errors after disposal

d85c8d2

Test for multiple concurrent errors

00e5e50

Stronger guidance to override OnErrorAsync

5eae0b1

SteveSandersonMS requested a review from a team April 7, 2021 14:08

SteveSandersonMS added this to the 6.0-preview4 milestone Apr 7, 2021

SteveSandersonMS marked this pull request as ready for review April 7, 2021 14:08

SteveSandersonMS requested review from javiercn and pranavkm as code owners April 7, 2021 14:08

captainsafia reviewed Apr 7, 2021

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CR: Improve unit test

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SteveSandersonMS merged commit 3a3aea8 into main Apr 8, 2021

SteveSandersonMS deleted the stevesa/error-boundaries branch April 8, 2021 18:33

SteveSandersonMS mentioned this pull request Apr 8, 2021

Add support for error boundaries in Blazor #26953

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thirstyape mentioned this pull request Dec 8, 2021

ErrorBoundary support for multiple exceptions #38905

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Error boundaries #30874

Error boundaries #30874

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thirstyape commented Dec 8, 2021

ghost commented Dec 8, 2021

		@@ -4170,6 +4170,241 @@ public async Task ThrowsIfComponentProducesInvalidRenderTree()
		Assert.StartsWith($"Render output is invalid for component of type '{typeof(TestComponent).FullName}'. A frame of type 'Element' was left unclosed.", ex.Message);

Error boundaries #30874

Error boundaries #30874

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SteveSandersonMS commented Mar 12, 2021 • edited Loading

Let's watch out for perf

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SteveSandersonMS Apr 8, 2021 • edited Loading

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thirstyape commented Dec 8, 2021

ghost commented Dec 8, 2021

SteveSandersonMS commented Mar 12, 2021 •

edited

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SteveSandersonMS Apr 8, 2021 •

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