/
IKeyedServiceProvider.cs
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/
IKeyedServiceProvider.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
namespace Microsoft.Extensions.DependencyInjection
{
/// <summary>
/// IKeyedServiceProvider is a service provider that can be used to retrieve services using a key in addition
/// to a type.
/// </summary>
public interface IKeyedServiceProvider : IServiceProvider
{
/// <summary>
/// Gets the service object of the specified type.
/// </summary>
/// <param name="serviceType">An object that specifies the type of service object to get.</param>
/// <param name="serviceKey">An object that specifies the key of service object to get.</param>
/// <returns> A service object of type serviceType. -or- null if there is no service object of type serviceType.</returns>
object? GetKeyedService(Type serviceType, object? serviceKey);
/// <summary>
/// Gets service of type <paramref name="serviceType"/> from the <see cref="IServiceProvider"/> implementing
/// this interface.
/// </summary>
/// <param name="serviceType">An object that specifies the type of service object to get.</param>
/// <param name="serviceKey">The <see cref="ServiceDescriptor.ServiceKey"/> of the service.</param>
/// <returns>A service object of type <paramref name="serviceType"/>.
/// Throws an exception if the <see cref="IServiceProvider"/> cannot create the object.</returns>
object GetRequiredKeyedService(Type serviceType, object? serviceKey);
}
/// <summary>
/// Statics for use with <see cref="IKeyedServiceProvider"/>.
/// </summary>
public static class KeyedService
{
/// <summary>
/// Represents a key that matches any key.
/// </summary>
public static object AnyKey { get; } = new AnyKeyObj();
private sealed class AnyKeyObj
{
public override string? ToString() => "*";
}
}
}