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Update dotnet-8 KeyedSevice #38333

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Update dotnet-8 KeyedSevice #38333

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Update dotnet-8 KeyedSevice
WeihanLi Nov 20, 2023
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Update dotnet-8.md
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37 changes: 23 additions & 14 deletions docs/core/whats-new/dotnet-8.md
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Expand Up @@ -674,35 +674,44 @@ Keyed dependency injection (DI) services provides a means for registering and re
- Various new extension methods for <xref:Microsoft.Extensions.DependencyInjection.IServiceCollection> to support keyed services, for example, <xref:Microsoft.Extensions.DependencyInjection.ServiceCollectionServiceExtensions.AddKeyedScoped%2A?displayProperty=nameWithType>.
- The <xref:Microsoft.Extensions.DependencyInjection.ServiceProvider> implementation of <xref:Microsoft.Extensions.DependencyInjection.IKeyedServiceProvider>.

The following example shows you to use keyed DI services.
The following example shows you how to use keyed DI services.

```csharp
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Options;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddSingleton<BigCacheConsumer>();
builder.Services.AddSingleton<SmallCacheConsumer>();

builder.Services.AddKeyedSingleton<IMemoryCache, BigCache>("big");
builder.Services.AddKeyedSingleton<IMemoryCache, SmallCache>("small");

builder.Services.AddKeyedSingleton<ICache, BigCache>("big");
builder.Services.AddKeyedSingleton<ICache, SmallCache>("small");
var app = builder.Build();

app.MapGet("/big", (BigCacheConsumer data) => data.GetData());
app.MapGet("/small", (SmallCacheConsumer data) => data.GetData());

app.MapGet("/big-cache", ([FromKeyedServices("big")] ICache cache) => cache.Get("data"));
app.MapGet("/small-cache", (HttpContext httpContext) => httpContext.RequestServices.GetRequiredKeyedService<ICache>("small").Get("data"));
app.Run();

class BigCacheConsumer([FromKeyedServices("big")] IMemoryCache cache)
class BigCacheConsumer([FromKeyedServices("big")] ICache cache)
{
public object? GetData() => cache.Get("data");
}

class SmallCacheConsumer(IKeyedServiceProvider keyedServiceProvider)
class SmallCacheConsumer(IServiceProvider serviceProvider)
{
public object? GetData() => serviceProvider.GetRequiredKeyedService<ICache>("small").Get("data");
}

public interface ICache
{
object Get(string key);
}

public class BigCache : ICache
{
public object Get(string key) => $"Resolving {key} from big cache.";
}

public class SmallCache : ICache
{
public object? GetData() => keyedServiceProvider.GetRequiredKeyedService<IMemoryCache>("small");
public object Get(string key) => $"Resolving {key} from small cache.";
}
```

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