-
Notifications
You must be signed in to change notification settings - Fork 9.9k
/
UrlHelperFactory.cs
64 lines (53 loc) · 1.94 KB
/
UrlHelperFactory.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Core;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;
namespace Microsoft.AspNetCore.Mvc.Routing;
/// <summary>
/// A default implementation of <see cref="IUrlHelperFactory"/>.
/// </summary>
public class UrlHelperFactory : IUrlHelperFactory
{
/// <inheritdoc />
public IUrlHelper GetUrlHelper(ActionContext context)
{
ArgumentNullException.ThrowIfNull(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
if (httpContext.Items.TryGetValue(typeof(IUrlHelper), out var value) && value is IUrlHelper urlHelper)
{
return urlHelper;
}
var endpoint = httpContext.GetEndpoint();
if (endpoint != null)
{
var services = httpContext.RequestServices;
var linkGenerator = services.GetRequiredService<LinkGenerator>();
var endpointDataSource = services.GetRequiredService<EndpointDataSource>();
urlHelper = new EndpointRoutingUrlHelper(
context,
linkGenerator,
endpointDataSource);
}
else
{
urlHelper = new UrlHelper(context);
}
httpContext.Items[typeof(IUrlHelper)] = urlHelper;
return urlHelper;
}
}