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Add IExceptionHandler sample
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‎README.md

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# Samples for ASP.NET Core 6.0, 7.0 and 8.0 RC 1 (499)
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# Samples for ASP.NET Core 6.0, 7.0 and 8.0 RC 1 (500)
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- Samples for ASP.NET Core **8.0 RC 1** is available [here](/projects/.net8) (36).
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- Samples for ASP.NET Core **8.0 RC 1** is available [here](/projects/.net8) (37).
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- Samples for ASP.NET Core **7.0** is available [here](/projects/.net7) (45).
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- Samples for ASP.NET Core **8.0 Preview 6** using EdgeDB.NET is [here](https://github.com/edgedb/edgedb-net).
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‎projects/.net8/README.md

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# ASP.NET 8.0 Preview 7 (36)
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# ASP.NET 8.0 Preview 7 (37)
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These samples require [.NET 8.0 RC 1](https://github.com/dotnet/installer#table).
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## Request Timeout
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* [Request Timeout](request-timeout)
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* [Request Timeout](request-timeout)
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This sample demonstrates how to configure a request timeout in Minimal API.
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This sample demonstrates how to configure a request timeout in Minimal API.
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* [Request Timeout Policy](request-timeout-2)
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* [Request Timeout Policy](request-timeout-2)
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Trigger exception on a timeout using `HttpContext.RequestAborted.ThrowIfCancellationRequested()` on a timeout that was specified using a named policy in Minimal API.
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Trigger exception on a timeout using `HttpContext.RequestAborted.ThrowIfCancellationRequested()` on a timeout that was specified using a named policy in Minimal API.
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* [Request Timeout Policy](request-timeout-3)
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* [Request Timeout Policy](request-timeout-3)
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Trigger exception on a timeout using `HttpContext.RequestAborted.ThrowIfCancellationRequested()` on a default timeout policy in Minimal API.
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Trigger exception on a timeout using `HttpContext.RequestAborted.ThrowIfCancellationRequested()` on a default timeout policy in Minimal API.
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* [Request Timeout](request-timeout-4)
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* [Request Timeout](request-timeout-4)
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Use `RequestTimeout` attribute in an MVC controller to specify when timeout is trigerred.
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Use `RequestTimeout` attribute in an MVC controller to specify when timeout is trigerred.
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* [Request Timeout](request-timeout-5)
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* [Request Timeout](request-timeout-5)
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Use `RequestTimeout` attribute in an MVC controller to use a named policy.
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Use `RequestTimeout` attribute in an MVC controller to use a named policy.
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## IExceptionHandler
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* [IExceptionHandler](iexception-handler)
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Implement `IExceptionHandler` to handle ASP.NET Core exceptions.
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## Keyed Services
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‎projects/.net8/iexception-handler/Program.cs

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using Microsoft.AspNetCore.Diagnostics;
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var builder = WebApplication.CreateBuilder();
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builder.Services.AddExceptionHandler<DefaultExceptionHandler>();
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var app = builder.Build();
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app.UseExceptionHandler(opt => { });
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app.MapGet("/", () =>
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{
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throw new Exception("Something went wrong");
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});
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app.Run();
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public class DefaultExceptionHandler : IExceptionHandler
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{
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public async ValueTask<bool> TryHandleAsync(HttpContext httpContext, Exception exception, CancellationToken cancellationToken)
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{
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await httpContext.Response.WriteAsync($"""
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<html>
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<body>
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Opps sorry. Exception message is {exception.Message} at {httpContext.Request.Method} {httpContext.Request.Path}.
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</body>
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</html>
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""");
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return true;
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}
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}

‎projects/.net8/iexception-handler/README.md

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# Implement IExceptionHandler to handle unhandled exceptions
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Implement `IExceptionHandler` for handling exceptions.

‎projects/.net8/iexception-handler/iexception-handler.csproj

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>true</ImplicitUsings>
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<LangVersion>preview</LangVersion>
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<PreviewFeatures>true</PreviewFeatures>
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</PropertyGroup>
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</Project>

‎projects/.net8/iexception-handler/iexception-handler.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.5.002.0
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "iexception-handler", "iexception-handler.csproj", "{14D0E714-54E8-409E-A7F7-DAE9860E46AD}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{14D0E714-54E8-409E-A7F7-DAE9860E46AD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{14D0E714-54E8-409E-A7F7-DAE9860E46AD}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{14D0E714-54E8-409E-A7F7-DAE9860E46AD}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{14D0E714-54E8-409E-A7F7-DAE9860E46AD}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {066322E2-9E78-45D8-BDD7-7679632BD24A}
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EndGlobalSection
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EndGlobal

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