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UrlHelperFactory.cs
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UrlHelperFactory.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 Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Core;
namespace Microsoft.AspNetCore.Mvc.Routing
{
/// <summary>
/// A default implementation of <see cref="IUrlHelperFactory"/>.
/// </summary>
public class UrlHelperFactory : IUrlHelperFactory
{
/// <inheritdoc />
public IUrlHelper GetUrlHelper(ActionContext context)
{
if (context == null)
{
throw new ArgumentNullException(Resources.ArgumentCannotBeNullOrEmpty, (nameof(context)));
}
var httpContext = context.HttpContext;
if (httpContext == null)
{
throw new ArgumentException(Resources.FormatPropertyOfTypeCannotBeNull(
nameof(ActionContext.HttpContext),
nameof(ActionContext)));
}
if (httpContext.Items == null)
{
throw new ArgumentException(Resources.FormatPropertyOfTypeCannotBeNull(
nameof(HttpContext.Items),
nameof(HttpContext)));
}
// Perf: Create only one UrlHelper per context
object value;
if (httpContext.Items.TryGetValue(typeof(IUrlHelper), out value) && value is IUrlHelper)
{
return (IUrlHelper)value;
}
var urlHelper = new UrlHelper(context);
httpContext.Items[typeof(IUrlHelper)] = urlHelper;
return urlHelper;
}
}
}