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[Blazor] Constructor injection updates (#33536)

pull/33538/head
Robert Haken 2024-09-05 16:26:31 +02:00 committed by GitHub
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10
aspnetcore/blazor/fundamentals/dependency-injection.md
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@ -224,7 +224,7 @@ After services are added to the service collection, inject one or more services
```razor
@page "/constructor-injection"
<button @onclick="@(() => Navigation.NavigateTo("/counter"))">
<button @onclick="HandleClick">
Take me to the Counter component
</button>
```
@ -236,7 +236,10 @@ using Microsoft.AspNetCore.Components;
public partial class ConstructorInjection(NavigationManager navigation)
{
protected NavigationManager Navigation { get; } = navigation;
private void HandleClick()
{
navigation.NavigateTo("/counter");
}
}
```
@ -616,7 +619,7 @@ There may be times when a Razor component invokes asynchronous methods that exec
For example, <xref:System.Net.Http.HttpClient> instances created using <xref:System.Net.Http.IHttpClientFactory> have their own DI service scope. As a result, <xref:System.Net.Http.HttpMessageHandler> instances configured on the <xref:System.Net.Http.HttpClient> aren't able to directly inject Blazor services.
Create a class `BlazorServiceAccessor` that defines an [`AsyncLocal`](xref:System.Threading.AsyncLocal`1), which stores the Blazor <xref:System.IServiceProvider> for the current asynchronous context. A `BlazorServiceAcccessor` instance can be acquired from within a different DI service scope to access Blazor services.
Create a class `BlazorServiceAccessor` that defines an [`AsyncLocal`](xref:System.Threading.AsyncLocal`1), which stores the Blazor <xref:System.IServiceProvider> for the current asynchronous context. A `BlazorServiceAccessor` instance can be acquired from within a different DI service scope to access Blazor services.
`BlazorServiceAccessor.cs`:
@ -769,6 +772,7 @@ services.AddScoped<BlazorServiceAccessor>();
* <xref:fundamentals/dependency-injection>
* [`IDisposable` guidance for Transient and shared instances](xref:fundamentals/dependency-injection#idisposable-guidance-for-transient-and-shared-instances)
* <xref:mvc/views/dependency-injection>
* [Primary constructors (C# Guide)](/dotnet/csharp/programming-guide/classes-and-structs/instance-constructors#primary-constructors)
:::moniker-end