|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using Microsoft.Extensions.DependencyInjection;
namespace Microsoft.Extensions.AI;
/// <summary>Provides an implementation of <see cref="IServiceProvider"/> that contains no services.</summary>
internal sealed class EmptyServiceProvider : IKeyedServiceProvider
{
/// <summary>Gets a singleton instance of <see cref="EmptyServiceProvider"/>.</summary>
public static EmptyServiceProvider Instance { get; } = new();
/// <inheritdoc />
public object? GetService(Type serviceType) => null;
/// <inheritdoc />
public object? GetKeyedService(Type serviceType, object? serviceKey) => null;
/// <inheritdoc />
public object GetRequiredKeyedService(Type serviceType, object? serviceKey) =>
GetKeyedService(serviceType, serviceKey) ??
throw new InvalidOperationException($"No service for type '{serviceType}' and key '{serviceKey}' has been registered.");
}
|