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Rick-Anderson merged 3 commits into from
May 12, 2023
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warn about registering customer service /5 #29221

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warn about registering customer service /5
Rick-Anderson May 10, 2023
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prob det
Rick-Anderson May 12, 2023
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Rick-Anderson May 12, 2023
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7 changes: 6 additions & 1 deletion aspnetcore/fundamentals/error-handling.md
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Expand Up @@ -268,10 +268,15 @@ For example, an [`HTTP Status 400 Bad Request`](https://developer.mozilla.org/do

#### Custom `IProblemDetailsWriter`

An <xref:Microsoft.AspNetCore.Http.IProblemDetailsWriter> implementation can be created for advanced customizations:
An <xref:Microsoft.AspNetCore.Http.IProblemDetailsWriter> implementation can be created for advanced customizations.

:::code language="csharp" source="~/../AspNetCore.Docs.Samples/fundamentals/middleware/problem-details-service/SampleProblemDetailsWriter.cs" :::

***Note:*** When using a custom `IProblemDetailsWriter`, the custom `IProblemDetailsWriter` must be registered before calling <xref:Microsoft.Extensions.DependencyInjection.MvcServiceCollectionExtensions.AddRazorPages%2A>, <xref:Microsoft.Extensions.DependencyInjection.MvcServiceCollectionExtensions.AddControllers%2A>, or <xref:Microsoft.Extensions.DependencyInjection.MvcServiceCollectionExtensions.AddControllersWithViews%2A>.

<!--TODO add program.cs snippet here
:::code language="csharp" source="~/../AspNetCore.Docs.Samples/fundamentals/middleware/problem-details-service/Program.cs" id="snippet" :::
-->
#### Problem details from Middleware

An alternative approach to using <xref:Microsoft.AspNetCore.Http.ProblemDetailsOptions> with <xref:Microsoft.AspNetCore.Http.ProblemDetailsOptions.CustomizeProblemDetails> is to set the <xref:Microsoft.AspNetCore.Http.ProblemDetailsContext.ProblemDetails> in middleware. A problem details response can be written by calling [`IProblemDetailsService.WriteAsync`](/dotnet/api/microsoft.aspnetcore.http.iproblemdetailsservice.writeasync?view=aspnetcore-7.0&preserve-view=true):
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