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DefaultPageModelActivatorProvider.cs
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DefaultPageModelActivatorProvider.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Reflection;
using Microsoft.Extensions.DependencyInjection;
namespace Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure
{
/// <summary>
/// <see cref="IPageActivatorProvider"/> that uses type activation to create Razor Page instances.
/// </summary>
public class DefaultPageModelActivatorProvider : IPageModelActivatorProvider
{
private readonly Action<PageContext, object> _disposer = Dispose;
/// <inheritdoc />
public virtual Func<PageContext, object> CreateActivator(CompiledPageActionDescriptor actionDescriptor)
{
if (actionDescriptor == null)
{
throw new ArgumentNullException(nameof(actionDescriptor));
}
var modelTypeInfo = actionDescriptor.ModelTypeInfo?.AsType();
if (modelTypeInfo == null)
{
throw new ArgumentException(Resources.FormatPropertyOfTypeCannotBeNull(
nameof(actionDescriptor.ModelTypeInfo),
nameof(actionDescriptor)),
nameof(actionDescriptor));
}
var factory = ActivatorUtilities.CreateFactory(modelTypeInfo, Type.EmptyTypes);
return (context) => factory(context.HttpContext.RequestServices, Array.Empty<object>());
}
public virtual Action<PageContext, object> CreateReleaser(CompiledPageActionDescriptor actionDescriptor)
{
if (actionDescriptor == null)
{
throw new ArgumentNullException(nameof(actionDescriptor));
}
if (typeof(IDisposable).GetTypeInfo().IsAssignableFrom(actionDescriptor.ModelTypeInfo))
{
return _disposer;
}
return null;
}
private static void Dispose(PageContext context, object page)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (page == null)
{
throw new ArgumentNullException(nameof(page));
}
((IDisposable)page).Dispose();
}
}
}