C# DataAnnotationsModelMetadataProvider类代码示例

        public void ReadOnlyTests(string propertyName, bool expected)
        {
            // Arrange
            var provider = new DataAnnotationsModelMetadataProvider();

            // Act
            var actual = provider.GetMetadataForProperty(null, typeof(ReadOnlyModel), propertyName).IsReadOnly;

            // Assert
            Assert.Equal(expected, actual);
        }

        public void GetMetadataForTypeSetsTypeWithNullPropertyName() {
            // Arrange
            DataAnnotationsModelMetadataProvider provider = new DataAnnotationsModelMetadataProvider();

            // Act
            ModelMetadata result = provider.GetMetadataForType(null, typeof(string));

            // Assert
            Assert.AreEqual(typeof(string), result.ModelType);
            Assert.IsNull(result.PropertyName);
        }

        public void GetMetadataForPropertySetsTypeAndPropertyName() {
            // Arrange
            DataAnnotationsModelMetadataProvider provider = new DataAnnotationsModelMetadataProvider();

            // Act
            ModelMetadata result = provider.GetMetadataForProperty(null, typeof(string), "Length");

            // Assert
            Assert.AreEqual(typeof(int), result.ModelType);
            Assert.AreEqual("Length", result.PropertyName);
        }

        public void ReadOnlyTests()
        {
            // Arrange
            var provider = new DataAnnotationsModelMetadataProvider();

            IModelFlattener test = new DefaultModelFlattener();
            var model = new DisplayModel();
            var result = test.Flatten(model, model.GetType(), provider, string.Empty);

            Assert.NotNull(result);
        }

        public void DataAnnotationsModelMetadataProvider_ReadsScaffoldColumnAttribute_ForShowForEdit()
        {
            // Arrange
            var type = typeof(ScaffoldColumnModel);
            var provider = new DataAnnotationsModelMetadataProvider();

            // Act & Assert
            Assert.True(provider.GetMetadataForProperty(null, type, "NoAttribute").ShowForEdit);
            Assert.True(provider.GetMetadataForProperty(null, type, "ScaffoldColumnTrue").ShowForEdit);
            Assert.False(provider.GetMetadataForProperty(null, type, "ScaffoldColumnFalse").ShowForEdit);
        }

        public void ReadOnlyTests()
        {
            // Arrange
            var provider = new DataAnnotationsModelMetadataProvider();

            // Act & Assert
            Assert.False(provider.GetMetadataForProperty(null, typeof(ReadOnlyModel), "NoAttributes").IsReadOnly);
            Assert.True(provider.GetMetadataForProperty(null, typeof(ReadOnlyModel), "ReadOnlyAttribute").IsReadOnly);
            Assert.True(provider.GetMetadataForProperty(null, typeof(ReadOnlyModel), "EditableAttribute").IsReadOnly);
            Assert.False(provider.GetMetadataForProperty(null, typeof(ReadOnlyModel), "BothAttributes").IsReadOnly);
        }

        public void GetMetadataForPropertiesSetTypesAndPropertyNames() {
            // Arrange
            DataAnnotationsModelMetadataProvider provider = new DataAnnotationsModelMetadataProvider();

            // Act
            IEnumerable<ModelMetadata> result = provider.GetMetadataForProperties("foo", typeof(string));

            // Assert
            Assert.IsTrue(result.Any(m => m.ModelType == typeof(int)
                                          && m.PropertyName == "Length"
                                          && (int)m.Model == 3));
        }

        public void ClientRulesWithCompareAttribute_ErrorMessageUsesPropertyName()
        {
            // Arrange
            var metadataProvider = new DataAnnotationsModelMetadataProvider();
            var metadata = metadataProvider.GetMetadataForProperty(() => null, typeof(PropertyNameModel), "MyProperty");
            var attribute = new CompareAttribute("OtherProperty");
            var context = new ClientModelValidationContext(metadata, metadataProvider);
            var adapter = new CompareAttributeAdapter(attribute);

            // Act
            var rules = adapter.GetClientValidationRules(context);

            // Assert
            var rule = Assert.Single(rules);
            Assert.Equal("'MyProperty' and 'OtherProperty' do not match.", rule.ErrorMessage);
        }

        public void GetClientValidationRules_ReturnsValidationParameters()
        {
            // Arrange
            var provider = new DataAnnotationsModelMetadataProvider();
            var metadata = provider.GetMetadataForProperty(() => null, typeof(string), "Length");
            var attribute = new RequiredAttribute();
            var adapter = new RequiredAttributeAdapter(attribute);
            var context = new ClientModelValidationContext(metadata, provider);

            // Act
            var rules = adapter.GetClientValidationRules(context);

            // Assert
            var rule = Assert.Single(rules);
            Assert.Equal("required", rule.ValidationType);
            Assert.Empty(rule.ValidationParameters);
            Assert.Equal("The Length field is required.", rule.ErrorMessage);
        }

        public void ClientRulesWithMaxLengthAttribute()
        {
            // Arrange
            var provider = new DataAnnotationsModelMetadataProvider();
            var metadata = provider.GetMetadataForProperty(() => null, typeof(string), "Length");
            var attribute = new MaxLengthAttribute(10);
            var adapter = new MaxLengthAttributeAdapter(attribute);
            var context = new ClientModelValidationContext(metadata, provider);

            // Act
            var rules = adapter.GetClientValidationRules(context);

            // Assert
            var rule = Assert.Single(rules);
            Assert.Equal("maxlength", rule.ValidationType);
            Assert.Equal(1, rule.ValidationParameters.Count);
            Assert.Equal(10, rule.ValidationParameters["max"]);
            Assert.Equal("The field Length must be a string or array type with a maximum length of '10'.", rule.ErrorMessage);
        }

        public void SettingViewData_AlsoUpdatesViewBag()
        {
            // Arrange
            var metadataProvider = new DataAnnotationsModelMetadataProvider();
            var controller = new Controller();
            var originalViewData = controller.ViewData = new ViewDataDictionary<object>(metadataProvider);
            var replacementViewData = new ViewDataDictionary<object>(metadataProvider);

            // Act
            controller.ViewBag.Hello = "goodbye";
            controller.ViewData = replacementViewData;
            controller.ViewBag.Another = "property";

            // Assert
            Assert.NotSame(originalViewData, controller.ViewData);
            Assert.Same(replacementViewData, controller.ViewData);
            Assert.Null(controller.ViewBag.Hello);
            Assert.Equal("property", controller.ViewBag.Another);
            Assert.Equal("property", controller.ViewData["Another"]);
        }

        public void HiddenAttributeSetsTemplateHintAndHideSurroundingHtml() {
            // Arrange
            DataAnnotationsModelMetadataProvider provider = new DataAnnotationsModelMetadataProvider();

            // Act & Assert
            ModelMetadata noAttributeMetadata = provider.GetMetadataForProperty(null, typeof(HiddenModel), "NoAttribute");
            Assert.IsNull(noAttributeMetadata.TemplateHint);
            Assert.IsFalse(noAttributeMetadata.HideSurroundingHtml);

            ModelMetadata defaultHiddenMetadata = provider.GetMetadataForProperty(null, typeof(HiddenModel), "DefaultHidden");
            Assert.AreEqual("HiddenInput", defaultHiddenMetadata.TemplateHint);
            Assert.IsFalse(defaultHiddenMetadata.HideSurroundingHtml);

            ModelMetadata hiddenWithDisplayValueFalseMetadata = provider.GetMetadataForProperty(null, typeof(HiddenModel), "HiddenWithDisplayValueFalse");
            Assert.AreEqual("HiddenInput", hiddenWithDisplayValueFalseMetadata.TemplateHint);
            Assert.IsTrue(hiddenWithDisplayValueFalseMetadata.HideSurroundingHtml);

            // [UIHint] overrides the template hint from [Hidden]
            Assert.AreEqual("CustomUIHint", provider.GetMetadataForProperty(null, typeof(HiddenModel), "HiddenAndUIHint").TemplateHint);
        }

        public void ClientRulesWithCompareAttribute_ErrorMessageUsesResourceOverride()
        {
            // Arrange
            var metadataProvider = new DataAnnotationsModelMetadataProvider();
            var metadata = metadataProvider.GetMetadataForProperty(() => null, typeof(PropertyNameModel), "MyProperty");
            var attribute = new CompareAttribute("OtherProperty")
            {
                ErrorMessageResourceName = "CompareAttributeTestResource",
                ErrorMessageResourceType = typeof(Test.Resources),
            };
            var context = new ClientModelValidationContext(metadata, metadataProvider);
            var adapter = new CompareAttributeAdapter(attribute);

            // Act
            var rules = adapter.GetClientValidationRules(context);

            // Assert
            var rule = Assert.Single(rules);
            Assert.Equal("Comparing MyProperty to OtherProperty.", rule.ErrorMessage);
        }

        public void GetClientValidationRules_ReturnsValidationParameters()
        {
            // Arrange
            var provider = new DataAnnotationsModelMetadataProvider();
            var metadata = provider.GetMetadataForProperty(() => null, typeof(string), "Length");
            var attribute = new RangeAttribute(typeof(decimal), "0", "100");
            var adapter = new RangeAttributeAdapter(attribute);
            var context = new ClientModelValidationContext(metadata, provider);

            // Act
            var rules = adapter.GetClientValidationRules(context);

            // Assert
            var rule = Assert.Single(rules);
            Assert.Equal("range", rule.ValidationType);
            Assert.Equal(2, rule.ValidationParameters.Count);
            Assert.Equal(0m, rule.ValidationParameters["min"]);
            Assert.Equal(100m, rule.ValidationParameters["max"]);
            Assert.Equal(@"The field Length must be between 0 and 100.", rule.ErrorMessage);
        }

        public void GetClientValidationRules_WithMinAndMaxLength_ReturnsValidationParameters()
        {
            // Arrange
            var provider = new DataAnnotationsModelMetadataProvider();
            var metadata = provider.GetMetadataForProperty(() => null, typeof(string), "Length");
            var attribute = new StringLengthAttribute(10) { MinimumLength = 3 };
            var adapter = new StringLengthAttributeAdapter(attribute);
            var context = new ClientModelValidationContext(metadata, provider);

            // Act
            var rules = adapter.GetClientValidationRules(context);

            // Assert
            var rule = Assert.Single(rules);
            Assert.Equal("length", rule.ValidationType);
            Assert.Equal(2, rule.ValidationParameters.Count);
            Assert.Equal(3, rule.ValidationParameters["min"]);
            Assert.Equal(10, rule.ValidationParameters["max"]);
            Assert.Equal("The field Length must be a string with a minimum length of 3 and a maximum length of 10.",
                         rule.ErrorMessage);
        }