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DateTimeRouteConstraint.cs
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DateTimeRouteConstraint.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.Globalization;
using Microsoft.AspNetCore.Http;
namespace Microsoft.AspNetCore.Routing.Constraints
{
/// <summary>
/// Constrains a route parameter to represent only <see cref="DateTime"/> values.
/// </summary>
/// <remarks>
/// This constraint tries to parse strings by using all of the formats returned by the
/// CultureInfo.InvariantCulture.DateTimeFormat.GetAllDateTimePatterns() method.
/// For a sample on how to list all formats which are considered, please visit
/// http://msdn.microsoft.com/en-us/library/aszyst2c(v=vs.110).aspx
/// </remarks>
public class DateTimeRouteConstraint : IRouteConstraint
{
/// <inheritdoc />
public bool Match(
HttpContext httpContext,
IRouter route,
string routeKey,
RouteValueDictionary values,
RouteDirection routeDirection)
{
if (httpContext == null)
{
throw new ArgumentNullException(nameof(httpContext));
}
if (route == null)
{
throw new ArgumentNullException(nameof(route));
}
if (routeKey == null)
{
throw new ArgumentNullException(nameof(routeKey));
}
if (values == null)
{
throw new ArgumentNullException(nameof(values));
}
object value;
if (values.TryGetValue(routeKey, out value) && value != null)
{
if (value is DateTime)
{
return true;
}
DateTime result;
var valueString = Convert.ToString(value, CultureInfo.InvariantCulture);
return DateTime.TryParse(valueString, CultureInfo.InvariantCulture, DateTimeStyles.None, out result);
}
return false;
}
}
}