41 lines
1.5 KiB
C#
41 lines
1.5 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System.Collections.Generic;
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using Microsoft.AspNet.Http;
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using Microsoft.Framework.Internal;
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namespace Microsoft.AspNet.Routing.Constraints
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{
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/// <summary>
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/// Defines a constraint on an optional parameter. If the parameter is present, then it is constrained by InnerConstraint.
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/// </summary>
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public class OptionalRouteConstraint : IRouteConstraint
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{
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public OptionalRouteConstraint([NotNull] IRouteConstraint innerConstraint)
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{
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InnerConstraint = innerConstraint;
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}
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public IRouteConstraint InnerConstraint { get; }
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public bool Match([NotNull] HttpContext httpContext,
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[NotNull] IRouter route,
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[NotNull] string routeKey,
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[NotNull] IDictionary<string, object> values,
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RouteDirection routeDirection)
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{
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object value;
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if (values.TryGetValue(routeKey, out value))
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{
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return InnerConstraint.Match(httpContext,
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route,
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routeKey,
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values,
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routeDirection);
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}
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return true;
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}
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}
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} |