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PageLinkGeneratorExtensions.cs
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PageLinkGeneratorExtensions.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.Http.Features;
using Microsoft.AspNetCore.Mvc.Routing;
namespace Microsoft.AspNetCore.Routing
{
/// <summary>
/// Extension methods for using <see cref="LinkGenerator"/> to generate links to Razor Pages.
/// </summary>
public static class PageLinkGeneratorExtensions
{
/// <summary>
/// Generates a URI with an absolute path based on the provided values.
/// </summary>
/// <param name="generator">The <see cref="LinkGenerator"/>.</param>
/// <param name="httpContext">The <see cref="HttpContext"/> associated with the current request.</param>
/// <param name="page">
/// The page name. Used to resolve endpoints. Optional. If <c>null</c> is provided, the current page route value
/// will be used.
/// </param>
/// <param name="handler">
/// The page handler name. Used to resolve endpoints. Optional.
/// </param>
/// <param name="values">The route values. Optional. Used to resolve endpoints and expand parameters in the route template.</param>
/// <param name="pathBase">
/// An optional URI path base. Prepended to the path in the resulting URI. If not provided, the value of <see cref="HttpRequest.PathBase"/> will be used.
/// </param>
/// <param name="fragment">A URI fragment. Optional. Appended to the resulting URI.</param>
/// <param name="options">
/// An optional <see cref="LinkOptions"/>. Settings on provided object override the settings with matching
/// names from <c>RouteOptions</c>.
/// </param>
/// <returns>A URI with an absolute path, or <c>null</c> if a URI cannot be created.</returns>
public static string GetPathByPage(
this LinkGenerator generator,
HttpContext httpContext,
string page = default,
string handler = default,
object values = default,
PathString? pathBase = default,
FragmentString fragment = default,
LinkOptions options = default)
{
if (generator == null)
{
throw new ArgumentNullException(nameof(generator));
}
if (httpContext == null)
{
throw new ArgumentNullException(nameof(httpContext));
}
var address = CreateAddress(httpContext, page, handler, values);
return generator.GetPathByAddress<RouteValuesAddress>(
httpContext,
address,
address.ExplicitValues,
address.AmbientValues,
pathBase,
fragment,
options);
}
/// <summary>
/// Generates a URI with an absolute path based on the provided values.
/// </summary>
/// <param name="generator">The <see cref="LinkGenerator"/>.</param>
/// <param name="page">
/// The page name. Used to resolve endpoints.
/// </param>
/// <param name="handler">
/// The page handler name. Used to resolve endpoints. Optional.
/// </param>
/// <param name="values">The route values. Optional. Used to resolve endpoints and expand parameters in the route template.</param>
/// <param name="pathBase">An optional URI path base. Prepended to the path in the resulting URI.</param>
/// <param name="fragment">A URI fragment. Optional. Appended to the resulting URI.</param>
/// <param name="options">
/// An optional <see cref="LinkOptions"/>. Settings on provided object override the settings with matching
/// names from <c>RouteOptions</c>.
/// </param>
/// <returns>A URI with an absolute path, or <c>null</c> if a URI cannot be created.</returns>
public static string GetPathByPage(
this LinkGenerator generator,
string page,
string handler = default,
object values = default,
PathString pathBase = default,
FragmentString fragment = default,
LinkOptions options = default)
{
if (generator == null)
{
throw new ArgumentNullException(nameof(generator));
}
if (page == null)
{
throw new ArgumentNullException(nameof(page));
}
var address = CreateAddress(httpContext: null, page, handler, values);
return generator.GetPathByAddress(address, address.ExplicitValues, pathBase, fragment, options);
}
/// <summary>
/// Generates an absolute URI based on the provided values.
/// </summary>
/// <param name="generator">The <see cref="LinkGenerator"/>.</param>
/// <param name="httpContext">The <see cref="HttpContext"/> associated with the current request.</param>
/// <param name="page">
/// The page name. Used to resolve endpoints. Optional. If <c>null</c> is provided, the current page route value
/// will be used.
/// </param>
/// <param name="handler">
/// The page handler name. Used to resolve endpoints. Optional.
/// </param>
/// <param name="values">The route values. Optional. Used to resolve endpoints and expand parameters in the route template.</param>
/// <param name="scheme">
/// The URI scheme, applied to the resulting URI. Optional. If not provided, the value of <see cref="HttpRequest.Scheme"/> will be used.
/// </param>
/// <param name="host">
/// The URI host/authority, applied to the resulting URI. Optional. If not provided, the value <see cref="HttpRequest.Host"/> will be used.
/// </param>
/// <param name="pathBase">
/// An optional URI path base. Prepended to the path in the resulting URI. If not provided, the value of <see cref="HttpRequest.PathBase"/> will be used.
/// </param>
/// <param name="fragment">A URI fragment. Optional. Appended to the resulting URI.</param>
/// <param name="options">
/// An optional <see cref="LinkOptions"/>. Settings on provided object override the settings with matching
/// names from <c>RouteOptions</c>.
/// </param>
/// <returns>A absolute URI, or <c>null</c> if a URI cannot be created.</returns>
public static string GetUriByPage(
this LinkGenerator generator,
HttpContext httpContext,
string page = default,
string handler = default,
object values = default,
string scheme = default,
HostString? host = default,
PathString? pathBase = default,
FragmentString fragment = default,
LinkOptions options = default)
{
if (generator == null)
{
throw new ArgumentNullException(nameof(generator));
}
if (httpContext == null)
{
throw new ArgumentNullException(nameof(httpContext));
}
var address = CreateAddress(httpContext, page, handler, values);
return generator.GetUriByAddress<RouteValuesAddress>(
httpContext,
address,
address.ExplicitValues,
address.AmbientValues,
scheme,
host,
pathBase,
fragment,
options);
}
/// <summary>
/// Generates an absolute URI based on the provided values.
/// </summary>
/// <param name="generator">The <see cref="LinkGenerator"/>.</param>
/// <param name="page">The page name. Used to resolve endpoints.</param>
/// <param name="handler">The page handler name. May be null.</param>
/// <param name="values">The route values. May be null. Used to resolve endpoints and expand parameters in the route template.</param>
/// <param name="scheme">The URI scheme, applied to the resulting URI.</param>
/// <param name="host">The URI host/authority, applied to the resulting URI.</param>
/// <param name="pathBase">An optional URI path base. Prepended to the path in the resulting URI.</param>
/// <param name="fragment">A URI fragment. Optional. Appended to the resulting URI.</param>
/// <param name="options">
/// An optional <see cref="LinkOptions"/>. Settings on provided object override the settings with matching
/// names from <c>RouteOptions</c>.
/// </param>
/// <returns>A absolute URI, or <c>null</c> if a URI cannot be created.</returns>
public static string GetUriByPage(
this LinkGenerator generator,
string page,
string handler,
object values,
string scheme,
HostString host,
PathString pathBase = default,
FragmentString fragment = default,
LinkOptions options = default)
{
if (generator == null)
{
throw new ArgumentNullException(nameof(generator));
}
if (page == null)
{
throw new ArgumentNullException(nameof(page));
}
var address = CreateAddress(httpContext: null, page, handler, values);
return generator.GetUriByAddress<RouteValuesAddress>(address, address.ExplicitValues, scheme, host, pathBase, fragment, options);
}
private static RouteValuesAddress CreateAddress(HttpContext httpContext, string page, string handler, object values)
{
var explicitValues = new RouteValueDictionary(values);
var ambientValues = GetAmbientValues(httpContext);
UrlHelperBase.NormalizeRouteValuesForPage(context: null, page, handler, explicitValues, ambientValues);
return new RouteValuesAddress()
{
AmbientValues = ambientValues,
ExplicitValues = explicitValues
};
}
private static RouteValueDictionary GetAmbientValues(HttpContext httpContext)
{
return httpContext?.Features.Get<IRouteValuesFeature>()?.RouteValues;
}
}
}