Microsoft.AspNet.Mvc.Razor.ViewLocationExpanderContext现实C# (CSharp)示例

最新推荐文章于 2024-09-28 11:53:24 发布
转载 最新推荐文章于 2024-09-28 11:53:24 发布 · 252 阅读 · 0 ·
CC 4.0 BY-SA版权
原文链接：https://blog.youkuaiyun.com/WuLex
文章标签：

#mvc #c# #microsoft #ViewLocation

本文档展示了多个ASP.NET MVC Razor视图定位扩展器的实现，包括LanguageViewLocationExpander，用于根据当前UI文化添加语言前缀到视图路径；CustomViewLocationExpander，自定义视图位置；以及TenantViewLocationExpander，考虑租户和主题的视图定位。这些扩展器增强了视图查找机制，支持多语言和自定义布局需求。

LanguageViewLocationExpander.cs

// 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.Collections.Generic;
using System.Globalization;
using System.Threading;

namespace Microsoft.AspNet.Mvc.Razor
{
    /// <summary>
    /// A <see cref="IViewLocationExpander"/> that adds the language as an extension prefix to view names. Language
    /// that is getting added as extension prefix comes from <see cref="Microsoft.AspNet.Http.HttpContext"/>.
    /// </summary>
    /// <example>
    /// For the default case with no areas, views are generated with the following patterns (assuming controller is
    /// "Home", action is "Index" and language is "en")
    /// Views/Home/en/Action
    /// Views/Home/Action
    /// Views/Shared/en/Action
    /// Views/Shared/Action
    /// </example>
    public class LanguageViewLocationExpander : IViewLocationExpander
    {
        private const string ValueKey = "language";
        private LanguageViewLocationExpanderFormat _format;

        /// <summary>
        /// Instantiates a new <see cref="LanguageViewLocationExpander"/> instance.
        /// </summary>
        public LanguageViewLocationExpander()
            : this(LanguageViewLocationExpanderFormat.Suffix)
        {
        }

        /// <summary>
        /// Instantiates a new <see cref="DefaultTagHelperActivator"/> instance.
        /// </summary>
        /// <param name="format">The <see cref="LanguageViewLocationExpanderFormat"/>.</param>
        public LanguageViewLocationExpander(LanguageViewLocationExpanderFormat format)
        {
            _format = format;
        }

        /// <inheritdoc />
        public void PopulateValues(ViewLocationExpanderContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException(nameof(context));
            }

            // Using CurrentUICulture so it loads the locale specific resources for the views.
#if NET451
            context.Values[ValueKey] = Thread.CurrentThread.CurrentUICulture.Name;
#else
            context.Values[ValueKey] = CultureInfo.CurrentUICulture.Name;
#endif
        }

        /// <inheritdoc />
        public virtual IEnumerable<string> ExpandViewLocations(
            ViewLocationExpanderContext context,
            IEnumerable<string> viewLocations)
        {
            if (context == null)
            {
                throw new ArgumentNullException(nameof(context));
            }

            if (viewLocations == null)
            {
                throw new ArgumentNullException(nameof(viewLocations));
            }

            string value;
            context.Values.TryGetValue(ValueKey, out value);

            if (!string.IsNullOrEmpty(value))
            {
                CultureInfo culture;
                try
                {
                    culture = new CultureInfo(value);
                }
                catch (CultureNotFoundException)
                {
                    return viewLocations;
                }

                return ExpandViewLocationsCore(viewLocations, culture);
            }

            return viewLocations;
        }

        private IEnumerable<string> ExpandViewLocationsCore(IEnumerable<string> viewLocations, CultureInfo cultureInfo)
        {
            foreach (var location in viewLocations)
            {
                var temporaryCultureInfo = cultureInfo;

                while (temporaryCultureInfo != temporaryCultureInfo.Parent)
                {
                    if (_format == LanguageViewLocationExpanderFormat.SubFolder)
                    {
                        yield return location.Replace("{0}", temporaryCultureInfo.Name + "/{0}");
                    }
                    else
                    {
                        yield return location.Replace("{0}", "{0}." + temporaryCultureInfo.Name);
                    }

                    temporaryCultureInfo = temporaryCultureInfo.Parent;
                }

                yield return location;
            }
        }
    }
}


using Microsoft.AspNet.Mvc.Razor;
using System.Collections.Generic;

namespace Host.UI
{
    public class CustomViewLocationExpander : IViewLocationExpander
    {
        public IEnumerable<string> ExpandViewLocations(
            ViewLocationExpanderContext context,
            IEnumerable<string> viewLocations)
        {
            yield return "~/UI/{1}/Views/{0}.cshtml";
            yield return "~/UI/SharedViews/{0}.cshtml";
        }

        public void PopulateValues(ViewLocationExpanderContext context)
        {
        }
    }
}

CustomViewLocationExpander.cs

using Microsoft.AspNet.Mvc.Razor;
using System.Collections.Generic;

namespace Host.UI
{
    public class CustomViewLocationExpander : IViewLocationExpander
    {
        public IEnumerable<string> ExpandViewLocations(
            ViewLocationExpanderContext context,
            IEnumerable<string> viewLocations)
        {
            yield return "~/UI/{1}/Views/{0}.cshtml";
            yield return "~/UI/SharedViews/{0}.cshtml";
        }

        public void PopulateValues(ViewLocationExpanderContext context)
        {
        }
    }
}

LanguageViewLocationExpander.cs

// Copyright (c) Microsoft Open Technologies, Inc. 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.Collections.Generic;
using Microsoft.AspNet.Mvc;
using Microsoft.AspNet.Mvc.Razor;

namespace RazorWebSite
{
    /// <summary>
    /// A <see cref="IViewLocationExpander"/> that replaces adds the language as an extension prefix to view names.
    /// </summary>
    /// <example>
    /// For the default case with no areas, views are generated with the following patterns (assuming controller is
    /// "Home", action is "Index" and language is "en")
    /// Views/Home/en/Action
    /// Views/Home/Action
    /// Views/Shared/en/Action
    /// Views/Shared/Action
    /// </example>
    public class LanguageViewLocationExpander : IViewLocationExpander
    {
        private const string ValueKey = "language";
        private readonly Func<ActionContext, string> _valueFactory;

        /// <summary>
        /// Initializes a new instance of <see cref="LanguageViewLocationExpander"/>.
        /// </summary>
        /// <param name="valueFactory">A factory that provides tbe language to use for expansion.</param>
        public LanguageViewLocationExpander(Func<ActionContext, string> valueFactory)
        {
            _valueFactory = valueFactory;
        }

        /// <inheritdoc />
        public void PopulateValues(ViewLocationExpanderContext context)
        {
            var value = _valueFactory(context.ActionContext);
            if (!string.IsNullOrEmpty(value))
            {
                context.Values[ValueKey] = value;
            }
        }

        /// <inheritdoc />
        public virtual IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context,
                                                               IEnumerable<string> viewLocations)
        {
            string value;
            if (context.Values.TryGetValue(ValueKey, out value))
            {
                return ExpandViewLocationsCore(viewLocations, value);
            }

            return viewLocations;
        }

        private IEnumerable<string> ExpandViewLocationsCore(IEnumerable<string> viewLocations,
                                                            string value)
        {
            foreach (var location in viewLocations)
            {
                yield return location.Replace("{0}", value + "/{0}");
                yield return location;
            }
        }
    }
}

PagesViewLocationExpander.cs

using Microsoft.AspNet.Mvc.Razor;
using System.Collections.Generic;

namespace Odachi.AspNet.MvcPages
{
    public class PagesViewLocationExpander : IViewLocationExpander
    {
        #region IViewLocationExpander

        public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
        {
			return new[]
			{
				"/Areas/{2}/App/{1}/{0}.cshtml",
				"/Areas/{2}/App/{0}.cshtml",
			};
        }

        public void PopulateValues(ViewLocationExpanderContext context)
        {
        }

        #endregion
    }
}

BaseViewLocationExpander.cs

namespace University.Module.Mvc.Razor
{
    using System.Collections.Generic;
    using System.Linq;

    using Microsoft.AspNet.Mvc.Razor;

    public abstract class BaseViewLocationExpander : IViewLocationExpander
    {
        #region Fields

        protected const string AreaKey = "area";

        #endregion Fields

        #region Constructors

        protected BaseViewLocationExpander(string areaName)
        {
            CurrentArea = areaName;
        }

        #endregion Constructors

        #region Properties

        protected string CurrentArea
        {
            get;
        }

        #endregion Properties

        #region Methods

        public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
        {
            var areaName = context.Values[AreaKey];
            return CurrentArea != areaName ? viewLocations : GetViewLocation(context, viewLocations, areaName);
        }

        public void PopulateValues(ViewLocationExpanderContext context)
        {
            context.Values[AreaKey] = context.ActionContext.RouteData.Values.FirstOrDefault(x => x.Key.Equals(AreaKey)).Value.ToString();
        }

        protected abstract IEnumerable<string> GetViewLocation(ViewLocationExpanderContext context, IEnumerable<string> viewLocations, string areaName);

        #endregion Methods
    }
}

TenantViewLocationExpander.cs

using Microsoft.AspNet.Http;
using Microsoft.AspNet.Mvc.Razor;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace AspNetMvcSample
{
    public class TenantViewLocationExpander : IViewLocationExpander
    {
        private const string THEME_KEY = "theme", TENANT_KEY = "tenant";

        public void PopulateValues(ViewLocationExpanderContext context)
        {
            context.Values[THEME_KEY] 
                = context.ActionContext.HttpContext.GetTenant<AppTenant>()?.Theme;

            context.Values[TENANT_KEY] 
                = context.ActionContext.HttpContext.GetTenant<AppTenant>()?.Name.Replace(" ", "-");
        }

        public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
        {
            string theme = null;
            if (context.Values.TryGetValue(THEME_KEY, out theme))
            {
                IEnumerable<string> themeLocations = new[]
                {
                    $"/Themes/{theme}/{{1}}/{{0}}.cshtml",
                    $"/Themes/{theme}/Shared/{{0}}.cshtml"
                };

                string tenant;
                if (context.Values.TryGetValue(TENANT_KEY, out tenant))
                {
                    themeLocations = ExpandTenantLocations(tenant, themeLocations);
                }

                viewLocations = themeLocations.Concat(viewLocations);
            }


            return viewLocations;
        }

        private IEnumerable<string> ExpandTenantLocations(string tenant, IEnumerable<string> defaultLocations)
        {
            foreach (var location in defaultLocations)
            {
                yield return location.Replace("{0}", $"{{0}}_{tenant}");
                yield return location;
            }
        }
    }
}

DefaultViewLocationCacheTest.cs

// 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.Collections.Generic;
using Microsoft.AspNet.Http.Internal;
using Microsoft.AspNet.Mvc.Abstractions;
using Microsoft.AspNet.Mvc.Routing;
using Microsoft.AspNet.Routing;
using Xunit;

namespace Microsoft.AspNet.Mvc.Razor
{
    public class DefaultViewLocationCacheTest
    {
        public static IEnumerable<object[]> CacheEntryData
        {
            get
            {
                yield return new[] { new ViewLocationExpanderContext(GetActionContext(), "test", isPartial: false) };
                yield return new[] { new ViewLocationExpanderContext(GetActionContext(), "test", isPartial: true) };

                var areaActionContext = GetActionContext("controller2", "myarea");
                yield return new[] { new ViewLocationExpanderContext(areaActionContext, "test2", isPartial: false) };
                yield return new[] { new ViewLocationExpanderContext(areaActionContext, "test2", isPartial: true) };

                var actionContext = GetActionContext("controller3", "area3");
                var values = new Dictionary<string, string>(StringComparer.Ordinal)
                {
                    { "culture", "fr" },
                    { "theme", "sleek" }
                };
                var expanderContext = new ViewLocationExpanderContext(actionContext, "test3", isPartial: false)
                {
                    Values = values
                };
                yield return new[] { expanderContext };

                expanderContext = new ViewLocationExpanderContext(actionContext, "test3", isPartial: true)
                {
                    Values = values
                };
                yield return new[] { expanderContext };
            }
        }

        private static DefaultViewLocationCache.ViewLocationCacheKeyComparer CacheKeyComparer =>
            DefaultViewLocationCache.ViewLocationCacheKeyComparer.Instance;

        [Theory]
        [MemberData(nameof(CacheEntryData))]
        public void Get_ReturnsNoneResultIfItemDoesNotExist(ViewLocationExpanderContext context)
        {
            // Arrange
            var cache = new DefaultViewLocationCache();

            // Act
            var result = cache.Get(context);

            // Assert
            Assert.Equal(result, ViewLocationCacheResult.None);
        }

        [Theory]
        [MemberData(nameof(CacheEntryData))]
        public void InvokingGetAfterSet_ReturnsCachedItem(ViewLocationExpanderContext context)
        {
            // Arrange
            var cache = new DefaultViewLocationCache();
            var value = new ViewLocationCacheResult(
                Guid.NewGuid().ToString(),
                new[]
                {
                    Guid.NewGuid().ToString(),
                    Guid.NewGuid().ToString()
                });

            // Act - 1
            cache.Set(context, value);
            var result = cache.Get(context);

            // Assert - 1
            Assert.Equal(value, result);

            // Act - 2
            result = cache.Get(context);

            // Assert - 2
            Assert.Equal(value, result);
        }

        [Theory]
        [InlineData("View1", "View2")]
        [InlineData("View1", "view1")]
        public void ViewLocationCacheKeyComparer_EqualsReturnsFalseIfViewNamesAreDifferent(
            string viewName1,
            string viewName2)
        {
            // Arrange
            var actionContext = GetActionContext();
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                actionContext,
                viewName1,
                isPartial: true);
            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               actionContext,
               viewName2,
               isPartial: true);

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.False(result);
            Assert.NotEqual(hash1, hash2);
        }

        [Theory]
        [InlineData(false, true)]
        [InlineData(true, false)]
        public void ViewLocationCacheKeyComparer_EqualsReturnsFalseIfIsPartialAreDifferent(
            bool isPartial1,
            bool isPartial2)
        {
            // Arrange
            var actionContext = GetActionContext();
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                actionContext,
                "View1",
                isPartial1);
            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               actionContext,
               "View1",
               isPartial2);

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.False(result);
            Assert.NotEqual(hash1, hash2);
        }

        [Theory]
        [InlineData("Controller1", "Controller2")]
        [InlineData("controller1", "Controller1")]
        public void ViewLocationCacheKeyComparer_EqualsReturnsFalseIfIsControllerNamesAreDifferent(
            string controller1,
            string controller2)
        {
            // Arrange
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                GetActionContext(controller1),
                "View1",
                isPartial: false);
            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               GetActionContext(controller2),
               "View1",
               isPartial: false);

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.False(result);
            Assert.NotEqual(hash1, hash2);
        }

        [Theory]
        [InlineData("area1", null)]
        [InlineData("Area1", "Area2")]
        [InlineData("area1", "aRea1")]
        public void ViewLocationCacheKeyComparer_EqualsReturnsFalseIfIsAreaNamesAreDifferent(
            string area1,
            string area2)
        {
            // Arrange
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                GetActionContext("Controller1", area1),
                "View1",
                isPartial: false);
            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               GetActionContext("Controller1", area2),
               "View1",
               isPartial: false);

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.False(result);
            Assert.NotEqual(hash1, hash2);
        }

        [Fact]
        public void ViewLocationCacheKeyComparer_EqualsReturnsTrueIfControllerAreaAndViewNamesAreIdentical()
        {
            // Arrange
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                GetActionContext("Controller1", "Area1"),
                "View1",
                isPartial: false);
            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               GetActionContext("Controller1", "Area1"),
               "View1",
               isPartial: false);

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.True(result);
            Assert.Equal(hash1, hash2);
        }

        [Fact]
        public void ViewLocationCacheKeyComparer_EqualsReturnsFalseIfViewLocationExpanderIsNullForEitherKey()
        {
            // Arrange
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                GetActionContext("Controller1", "Area1"),
                "View1",
                isPartial: false);
            viewLocationExpanderContext1.Values = new Dictionary<string, string>
            {
                { "somekey", "somevalue" }
            };

            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               GetActionContext("Controller1", "Area1"),
               "View1",
               isPartial: false);

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.False(result);
            Assert.NotEqual(hash1, hash2);
        }

        [Fact]
        public void ViewLocationCacheKeyComparer_EqualsReturnsFalseIfExpanderValueCountIsDifferent()
        {
            // Arrange
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                GetActionContext("Controller1", "Area1"),
                "View1",
                isPartial: false);
            viewLocationExpanderContext1.Values = new Dictionary<string, string>
            {
                { "somekey", "somevalue" }
            };

            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               GetActionContext("Controller1", "Area1"),
               "View1",
               isPartial: false);
            viewLocationExpanderContext2.Values = new Dictionary<string, string>
            {
                { "somekey", "somevalue" },
                { "somekey2", "somevalue2" },
            };

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.False(result);
            Assert.NotEqual(hash1, hash2);
        }

        [Theory]
        [InlineData("key1", "key2")]
        [InlineData("Key1", "key1")]
        public void ViewLocationCacheKeyComparer_EqualsReturnsFalseIfKeysAreDifferent(
            string keyName1,
            string keyName2)
        {
            // Arrange
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                GetActionContext("Controller1", "Area1"),
                "View1",
                isPartial: false);
            viewLocationExpanderContext1.Values = new Dictionary<string, string>
            {
                { keyName1, "somevalue" }
            };

            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               GetActionContext("Controller1", "Area1"),
               "View1",
               isPartial: false);
            viewLocationExpanderContext2.Values = new Dictionary<string, string>
            {
                { keyName2, "somevalue" },
            };

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.False(result);
            Assert.NotEqual(hash1, hash2);
        }

        [Theory]
        [InlineData("value1", null)]
        [InlineData("value1", "value2")]
        [InlineData("value1", "Value1")]
        public void ViewLocationCacheKeyComparer_EqualsReturnsFalseIfValuesAreDifferent(
            string value1,
            string value2)
        {
            // Arrange
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                GetActionContext("Controller1", "Area1"),
                "View1",
                isPartial: false);
            viewLocationExpanderContext1.Values = new Dictionary<string, string>
            {
                { "somekey", value1 }
            };

            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               GetActionContext("Controller1", "Area1"),
               "View1",
               isPartial: false);
            viewLocationExpanderContext2.Values = new Dictionary<string, string>
            {
                { "somekey", value2 },
            };

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.False(result);
            Assert.NotEqual(hash1, hash2);
        }

        public void ViewLocationCacheKeyComparer_EqualsReturnsTrueIfValuesAreSame()
        {
            // Arrange
            var viewLocationExpanderContext1 = new ViewLocationExpanderContext(
                GetActionContext("Controller1", "Area1"),
                "View1",
                isPartial: false);
            viewLocationExpanderContext1.Values = new Dictionary<string, string>
            {
                { "somekey1", "value1" },
                { "somekey2", "value2" },
            };

            var viewLocationExpanderContext2 = new ViewLocationExpanderContext(
               GetActionContext("Controller1", "Area1"),
               "View1",
               isPartial: false);
            viewLocationExpanderContext2.Values = new Dictionary<string, string>
            {
                { "somekey2", "value2" },
                { "somekey1", "value1" },
            };

            // Act
            var key1 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext1,
                copyViewExpanderValues: false);

            var key2 = DefaultViewLocationCache.GenerateKey(
                viewLocationExpanderContext2,
                copyViewExpanderValues: false);

            var result = CacheKeyComparer.Equals(key1, key2);
            var hash1 = CacheKeyComparer.GetHashCode(key1);
            var hash2 = CacheKeyComparer.GetHashCode(key2);

            // Assert
            Assert.True(result);
            Assert.Equal(hash1, hash2);
        }

        public static ActionContext GetActionContext(
            string controller = "mycontroller",
            string area = null)
        {
            var routeData = new RouteData();
            routeData.Values["controller"] = controller;
            if (area != null)
            {
                routeData.Values["area"] = area;
            }

            var actionDesciptor = new ActionDescriptor();
            actionDesciptor.RouteConstraints = new List<RouteDataActionConstraint>();
            return new ActionContext(new DefaultHttpContext(), routeData, actionDesciptor);
        }

        private static ActionContext GetActionContextWithActionDescriptor(
            IDictionary<string, object> routeValues,
            IDictionary<string, string> routesInActionDescriptor,
            bool isAttributeRouted)
        {
            var httpContext = new DefaultHttpContext();
            var routeData = new RouteData();
            foreach (var kvp in routeValues)
            {
                routeData.Values.Add(kvp.Key, kvp.Value);
            }

            var actionDescriptor = new ActionDescriptor();
            if (isAttributeRouted)
            {
                actionDescriptor.AttributeRouteInfo = new Routing.AttributeRouteInfo();
                foreach (var kvp in routesInActionDescriptor)
                {
                    actionDescriptor.RouteValueDefaults.Add(kvp.Key, kvp.Value);
                }
            }
            else
            {
                actionDescriptor.RouteConstraints = new List<RouteDataActionConstraint>();
                foreach (var kvp in routesInActionDescriptor)
                {
                    actionDescriptor.RouteConstraints.Add(new RouteDataActionConstraint(kvp.Key, kvp.Value));
                }
            }

            return new ActionContext(httpContext, routeData, actionDescriptor);
        }
    }
}
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