Fixing 2340: ModelMetadata should recompute localizable properties.

src/Microsoft.AspNet.Mvc.Core/ModelBinding/Metadata/DataAnnotationsMetadataProvider.cs

@@ -72,7 +72,7 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
             // Description
             if (displayAttribute != null)
             {
-                displayMetadata.Description = displayAttribute.GetDescription();
+                displayMetadata.Description = () => displayAttribute.GetDescription();
             }
 
             // DisplayFormat
@@ -84,7 +84,7 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
             // DisplayName
             if (displayAttribute != null)
             {
-                displayMetadata.DisplayName = displayAttribute.GetName();
+                displayMetadata.DisplayName = () => displayAttribute.GetName();
             }
 
             if (displayFormatAttribute != null && displayFormatAttribute.ApplyFormatInEditMode)

src/Microsoft.AspNet.Mvc.Core/ModelBinding/Metadata/DefaultModelMetadata.cs

@@ -179,7 +179,12 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
         {
             get
             {
-                return DisplayMetadata.Description;
+                if (DisplayMetadata.Description == null)
+                {
+                    return null;
+                }
+
+                return DisplayMetadata.Description();
             }
         }
 
@@ -197,7 +202,12 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
         {
             get
             {
-                return DisplayMetadata.DisplayName;
+                if (DisplayMetadata.DisplayName == null)
+                {
+                    return null;
+                }
+
+                return DisplayMetadata.DisplayName();
             }
         }
 

src/Microsoft.AspNet.Mvc.Core/ModelBinding/Metadata/DisplayMetadata.cs

@@ -1,6 +1,7 @@
 // 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;
 
 namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
@@ -28,10 +29,10 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
         public string DataTypeName { get; set; }
 
         /// <summary>
-        /// Gets or sets a model description.
+        /// Gets or sets a delegate which is used to get a value for the
-        /// See <see cref="ModelMetadata.Description"/>
+        /// model description. See <see cref="ModelMetadata.Description"/>.
         /// </summary>
-        public string Description { get; set; }
+        public Func<string> Description { get; set; }
 
         /// <summary>
         /// Gets or sets a display format string for the model.
@@ -40,10 +41,10 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
         public string DisplayFormatString { get; set; }
 
         /// <summary>
-        /// Gets or sets a display name for the model.
+        /// Gets or sets a delegate delegate which is used to get a value for the
-        /// See <see cref="ModelMetadata.DisplayName"/>
+        /// display name of the model. See <see cref="ModelMetadata.DisplayName"/>.
         /// </summary>
-        public string DisplayName { get; set; }
+        public Func<string> DisplayName { get; set; }
 
         /// <summary>
         /// Gets or sets an edit format string for the model.

test/Microsoft.AspNet.Mvc.Core.Test/ModelBinding/Metadata/DataAnnotationsMetadataProviderTest.cs

@@ -20,8 +20,8 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
                 {
                     { new DataTypeAttribute(DataType.Duration), d => d.DataTypeName, DataType.Duration.ToString() },
 
-                    { new DisplayAttribute() { Description = "d" }, d => d.Description, "d" },
+                    { new DisplayAttribute() { Description = "d" }, d => d.Description(), "d" },
-                    { new DisplayAttribute() { Name = "DN" }, d => d.DisplayName, "DN" },
+                    { new DisplayAttribute() { Name = "DN" }, d => d.DisplayName(), "DN" },
                     { new DisplayAttribute() { Order = 3 }, d => d.Order, 3 },
 
                     { new DisplayColumnAttribute("Property"), d => d.SimpleDisplayProperty, "Property" },
@@ -175,7 +175,7 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
             provider.GetDisplayMetadata(context);
 
             // Assert
-            Assert.Equal("name from resources", context.DisplayMetadata.DisplayName);
+            Assert.Equal("name from resources", context.DisplayMetadata.DisplayName());
         }
 
         // This is IMPORTANT. Product code needs to use GetDescription() instead of .Description. It's easy to regress.
@@ -204,7 +204,7 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
             provider.GetDisplayMetadata(context);
 
             // Assert
-            Assert.Equal("description from resources", context.DisplayMetadata.Description);
+            Assert.Equal("description from resources", context.DisplayMetadata.Description());
         }
 
         [Theory]

test/Microsoft.AspNet.Mvc.Core.Test/ModelBinding/Metadata/ModelMetadataProviderTest.cs

@@ -7,6 +7,8 @@ using System.ComponentModel.DataAnnotations;
 using System.Linq;
 using System.Reflection;
 using System.Runtime.Serialization;
+using System.Threading;
+using Microsoft.AspNet.Testing;
 using Microsoft.Framework.Internal;
 using Xunit;
 
@@ -420,6 +422,58 @@ namespace Microsoft.AspNet.Mvc.ModelBinding.Metadata
             Assert.Equal("description", result);
         }
 
+        [Fact]
+        public void DisplayName_FromResources_GetsRecomputed()
+        {
+            // Arrange
+            var display = new DisplayAttribute()
+            {
+                Name = nameof(TestResources.DisplayAttribute_CultureSensitiveName),
+                ResourceType = typeof(TestResources),
+            };
+
+            var provider = CreateProvider(new[] { display });
+            var metadata = provider.GetMetadataForType(typeof(string));
+
+            // Act & Assert
+            var cultures = new[] { "fr-FR", "en-US", "en-GB" };
+            foreach (var culture in cultures)
+            {
+                using (new CultureReplacer(uiCulture: culture))
+                {
+                    // Later iterations ensure value is recomputed.
+                    var result = metadata.DisplayName;
+                    Assert.Equal("name from resources" + culture, result);
+                }
+            }
+        }
+
+        [Fact]
+        public void Description_FromResources_GetsRecomputed()
+        {
+            // Arrange
+            var display = new DisplayAttribute()
+            {
+                Description = nameof(TestResources.DisplayAttribute_CultureSensitiveDescription),
+                ResourceType = typeof(TestResources),
+            };
+
+            var provider = CreateProvider(new[] { display });
+            var metadata = provider.GetMetadataForType(typeof(string));
+
+            // Act & Assert
+            var cultures = new[] { "fr-FR", "en-US", "en-GB" };
+            foreach (var culture in cultures)
+            {
+                using (new CultureReplacer(uiCulture: culture))
+                {
+                    // Later iterations ensure value is recomputed.
+                    var result = metadata.Description;
+                    Assert.Equal("description from resources" + culture, result);
+                }
+            }
+        }
+
         [Fact]
         public void DataTypeName_Null_IfHtmlEncodeTrue()
         {

test/Microsoft.AspNet.Mvc.Core.Test/ModelBinding/TestResources.cs

@@ -1,6 +1,7 @@
 // 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.Threading;
 using Microsoft.AspNet.Mvc.Core.Test;
 
 namespace Microsoft.AspNet.Mvc.ModelBinding
@@ -12,5 +13,11 @@ namespace Microsoft.AspNet.Mvc.ModelBinding
         public static string DisplayAttribute_Description { get; } = Resources.DisplayAttribute_Description;
 
         public static string DisplayAttribute_Name { get; } = Resources.DisplayAttribute_Name;
+
+        public static string DisplayAttribute_CultureSensitiveName =>
+            Resources.DisplayAttribute_Name + Thread.CurrentThread.CurrentUICulture;
+
+        public static string DisplayAttribute_CultureSensitiveDescription =>
+            Resources.DisplayAttribute_Description + Thread.CurrentThread.CurrentUICulture;
     }
 }

test/Microsoft.AspNet.Mvc.Core.Test/Rendering/HtmlHelperDisplayNameExtensionsTest.cs

@@ -97,7 +97,7 @@ namespace Microsoft.AspNet.Mvc.Core
             var provider = new TestModelMetadataProvider();
             provider
                 .ForType<DefaultTemplatesUtilities.ObjectTemplateModel>()
-                .DisplayDetails(dd => dd.DisplayName = displayName);
+                .DisplayDetails(dd => dd.DisplayName = () => displayName);
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(provider: provider);
             var enumerableHelper = DefaultTemplatesUtilities.GetHtmlHelperForEnumerable(provider: provider);
@@ -124,7 +124,7 @@ namespace Microsoft.AspNet.Mvc.Core
             var provider = new TestModelMetadataProvider();
             provider
                 .ForProperty<DefaultTemplatesUtilities.ObjectTemplateModel>("Property1")
-                .DisplayDetails(dd => dd.DisplayName = displayName);
+                .DisplayDetails(dd => dd.DisplayName = () => displayName);
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(provider: provider);
             var enumerableHelper = DefaultTemplatesUtilities.GetHtmlHelperForEnumerable(provider: provider);

test/Microsoft.AspNet.Mvc.Core.Test/Rendering/HtmlHelperLabelExtensionsTest.cs

@@ -110,7 +110,7 @@ namespace Microsoft.AspNet.Mvc.Core
             var provider = new TestModelMetadataProvider();
             provider
                 .ForType<DefaultTemplatesUtilities.ObjectTemplateModel>()
-                .DisplayDetails(dd => dd.DisplayName = string.Empty);
+                .DisplayDetails(dd => dd.DisplayName = () => string.Empty);
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(provider: provider);
 
@@ -136,7 +136,7 @@ namespace Microsoft.AspNet.Mvc.Core
             var provider = new TestModelMetadataProvider();
             provider
                 .ForType<DefaultTemplatesUtilities.ObjectTemplateModel>()
-                .DisplayDetails(dd => dd.DisplayName = displayName);
+                .DisplayDetails(dd => dd.DisplayName = () => displayName);
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(provider: provider);
 
@@ -158,7 +158,7 @@ namespace Microsoft.AspNet.Mvc.Core
             var provider = new TestModelMetadataProvider();
             provider
                 .ForProperty<DefaultTemplatesUtilities.ObjectTemplateModel>("Property1")
-                .DisplayDetails(dd => dd.DisplayName = string.Empty);
+                .DisplayDetails(dd => dd.DisplayName = () => string.Empty);
 
             var modelExplorer = provider
                 .GetModelExplorerForType(typeof(DefaultTemplatesUtilities.ObjectTemplateModel), model: null)
@@ -188,7 +188,7 @@ namespace Microsoft.AspNet.Mvc.Core
             var provider = new TestModelMetadataProvider();
             provider
                 .ForProperty<DefaultTemplatesUtilities.ObjectTemplateModel>("Property1")
-                .DisplayDetails(dd => dd.DisplayName = displayName);
+                .DisplayDetails(dd => dd.DisplayName = () => displayName);
 
             var helper = DefaultTemplatesUtilities.GetHtmlHelper(provider: provider);