C# TestModelMetadataProvider类代码示例

        public void GetValidators_CachesAllValidators()
        {
            // Arrange
            var cache = new ValidatorCache();
            var metadata = new TestModelMetadataProvider().GetMetadataForProperty(typeof(TypeWithProperty), "Property1");
            var validatorProvider = TestModelValidatorProvider.CreateDefaultProvider();

            // Act - 1
            var validators1 = cache.GetValidators(metadata, validatorProvider);

            // Assert - 1
            var attribute1 = Assert.IsType<DataAnnotationsModelValidator>(validators1[0]).Attribute;
            var attribute2 = Assert.IsType<DataAnnotationsModelValidator>(validators1[1]).Attribute;
            Assert.Contains(attribute1, metadata.ValidatorMetadata); // Copied by provider
            Assert.Contains(attribute2, metadata.ValidatorMetadata); // Copied by provider

            // Act - 2
            var validators2 = cache.GetValidators(metadata, validatorProvider);

            // Assert - 2
            Assert.Same(validators1, validators2);

            Assert.Contains(validators1[0], validators2); // Cached
            Assert.Contains(validators1[1], validators2); // Cached
        }

        public void GetValidators_DoesNotCacheValidatorsWithIsReusableFalse()
        {
            // Arrange
            var cache = new ValidatorCache();
            var metadata = new TestModelMetadataProvider().GetMetadataForProperty(typeof(TypeWithProperty), "Property1");
            var validatorProvider = new ProviderWithNonReusableValidators();

            // Act - 1
            var validators1 = cache.GetValidators(metadata, validatorProvider);

            // Assert - 1
            var validator1 = Assert.IsType<DataAnnotationsModelValidator>(validators1[0]);
            var validator2 = Assert.IsType<DataAnnotationsModelValidator>(validators1[1]);
            Assert.Contains(validator1.Attribute, metadata.ValidatorMetadata); // Copied by provider
            Assert.Contains(validator2.Attribute, metadata.ValidatorMetadata); // Copied by provider

            // Act - 2
            var validators2 = cache.GetValidators(metadata, validatorProvider);

            // Assert - 2
            Assert.NotSame(validators1, validators2);

            var requiredValidator = Assert.Single(validators2.Where(v => (v as DataAnnotationsModelValidator).Attribute is RequiredAttribute));
            Assert.Contains(requiredValidator, validators1); // cached
            var stringLengthValidator = Assert.Single(validators2.Where(v => (v as DataAnnotationsModelValidator).Attribute is StringLengthAttribute));
            Assert.DoesNotContain(stringLengthValidator, validators1); // not cached
        }

        public void GetValidators_CachesAllValidators()
        {
            // Arrange
            var cache = new ClientValidatorCache();
            var metadata = new TestModelMetadataProvider().GetMetadataForProperty(typeof(TypeWithProperty), "Property1");
            var validatorProvider = TestClientModelValidatorProvider.CreateDefaultProvider();

            // Act - 1
            var validators1 = cache.GetValidators(metadata, validatorProvider);

            // Assert - 1
            var attribute1 = Assert.Single(validators1.OfType<RequiredAttributeAdapter>()).Attribute;
            var attribute2 = Assert.Single(validators1.OfType<StringLengthAttributeAdapter>()).Attribute;
            Assert.Contains(attribute1, metadata.ValidatorMetadata); // Copied by provider
            Assert.Contains(attribute2, metadata.ValidatorMetadata); // Copied by provider

            // Act - 2
            var validators2 = cache.GetValidators(metadata, validatorProvider);

            // Assert - 2
            Assert.Same(validators1, validators2);

            Assert.Contains(validators1[0], validators2); // Cached
            Assert.Contains(validators1[1], validators2); // Cached
        }

        public void GetValidators_DoesNotCacheValidatorsWithIsReusableFalse()
        {
            // Arrange
            var cache = new ClientValidatorCache();
            var metadata = new TestModelMetadataProvider().GetMetadataForProperty(typeof(TypeWithProperty), "Property1");
            var validatorProvider = new ProviderWithNonReusableValidators();

            // Act - 1
            var validators1 = cache.GetValidators(metadata, validatorProvider);

            // Assert - 1
            var validator1 = Assert.Single(validators1.OfType<RequiredAttributeAdapter>());
            var validator2 = Assert.Single(validators1.OfType<StringLengthAttributeAdapter>());
            Assert.Contains(validator1.Attribute, metadata.ValidatorMetadata); // Copied by provider
            Assert.Contains(validator2.Attribute, metadata.ValidatorMetadata); // Copied by provider

            // Act - 2
            var validators2 = cache.GetValidators(metadata, validatorProvider);

            // Assert - 2
            Assert.NotSame(validators1, validators2);

            Assert.Same(validator1, Assert.Single(validators2.OfType<RequiredAttributeAdapter>())); // cached
            Assert.NotSame(validator2, Assert.Single(validators2.OfType<StringLengthAttributeAdapter>())); // not cached
        }

        public void Create_ForModelMetadataReadOnly_ReturnsNull()
        {
            // Arrange
            var metadataProvider = new TestModelMetadataProvider();
            metadataProvider.ForProperty(
                typeof(ModelWithIntArrayProperty),
                nameof(ModelWithIntArrayProperty.ArrayProperty)).BindingDetails(bd => bd.IsReadOnly = true);

            var modelMetadata = metadataProvider.GetMetadataForProperty(
                typeof(ModelWithIntArrayProperty),
                nameof(ModelWithIntArrayProperty.ArrayProperty));

            var provider = new ArrayModelBinderProvider();
            var context = new TestModelBinderProviderContext(typeof(int[]));
            context.OnCreatingBinder((m) =>
            {
                // Expect to be called with the element type to create a binder for elements.
                Assert.Equal(typeof(int), m.ModelType);
                return Mock.Of<IModelBinder>();
            });

            // Act
            var result = provider.GetBinder(context);

            // Assert
            Assert.IsType<ArrayModelBinder<int>>(result);
        }

        public void AddValidation_CorrectValidationTypeAndOverriddenErrorMessage()
        {
            // Arrange
            var expectedMessage = "Error message about 'DisplayId' from override.";
            var provider = new TestModelMetadataProvider();
            provider
                .ForProperty(typeof(TypeWithNumericProperty), nameof(TypeWithNumericProperty.Id))
                .BindingDetails(d => d.ModelBindingMessageProvider.ValueMustBeANumberAccessor =
                    name => $"Error message about '{ name }' from override.");
            var metadata = provider.GetMetadataForProperty(
                typeof(TypeWithNumericProperty),
                nameof(TypeWithNumericProperty.Id));

            var adapter = new NumericClientModelValidator();

            var actionContext = new ActionContext();
            var context = new ClientModelValidationContext(actionContext, metadata, provider, new AttributeDictionary());

            // Act
            adapter.AddValidation(context);

            // Assert
            Assert.Collection(
                context.Attributes,
                kvp => { Assert.Equal("data-val", kvp.Key); Assert.Equal("true", kvp.Value); },
                kvp => { Assert.Equal("data-val-number", kvp.Key); Assert.Equal(expectedMessage, kvp.Value); });
        }

        public async Task BindModel_CallsSelectedInputFormatterOnce()
        {
            // Arrange
            var mockInputFormatter = new Mock<IInputFormatter>();
            mockInputFormatter.Setup(f => f.CanRead(It.IsAny<InputFormatterContext>()))
                .Returns(true)
                .Verifiable();
            mockInputFormatter.Setup(o => o.ReadAsync(It.IsAny<InputFormatterContext>()))
                              .Returns(InputFormatterResult.SuccessAsync(new Person()))
                              .Verifiable();
            var inputFormatter = mockInputFormatter.Object;

            var provider = new TestModelMetadataProvider();
            provider.ForType<Person>().BindingDetails(d => d.BindingSource = BindingSource.Body);

            var bindingContext = GetBindingContext(
                typeof(Person),
                new[] { inputFormatter },
                metadataProvider: provider);

            var binder = new BodyModelBinder();

            // Act
            var binderResult = await binder.BindModelAsync(bindingContext);

            // Assert
            mockInputFormatter.Verify(v => v.CanRead(It.IsAny<InputFormatterContext>()), Times.Once);
            mockInputFormatter.Verify(v => v.ReadAsync(It.IsAny<InputFormatterContext>()), Times.Once);
            Assert.NotNull(binderResult);
            Assert.True(binderResult.IsModelSet);
        }

        private static DefaultModelBindingContext GetBindingContext(Type modelType)
        {
            var metadataProvider = new TestModelMetadataProvider();
            metadataProvider.ForType(modelType).BindingDetails(d => d.BindingSource = BindingSource.Services);
            var modelMetadata = metadataProvider.GetMetadataForType(modelType);

            var services = new ServiceCollection();
            services.AddSingleton<IService>(new Service());

            var bindingContext = new DefaultModelBindingContext
            {
                ActionContext = new ActionContext()
                {
                    HttpContext = new DefaultHttpContext()
                    {
                        RequestServices = services.BuildServiceProvider(),
                    }
                },
                ModelMetadata = modelMetadata,
                ModelName = "modelName",
                FieldName = "modelName",
                ModelState = new ModelStateDictionary(),
                BinderModelName = modelMetadata.BinderModelName,
                BindingSource = modelMetadata.BindingSource,
                ValidationState = new ValidationStateDictionary(),
            };

            return bindingContext;
        }

        public async Task BindModelAsync_ValueProviderContainPrefix_Succeeds()
        {
            // Arrange
            var valueProvider = new SimpleValueProvider
            {
                { "someName[0]", "42" },
                { "someName[1]", "84" },
            };

            var bindingContext = GetBindingContext(valueProvider);
            var metadataProvider = new TestModelMetadataProvider();
            bindingContext.ModelMetadata = metadataProvider.GetMetadataForProperty(
                typeof(ModelWithIntArrayProperty),
                nameof(ModelWithIntArrayProperty.ArrayProperty));

            var binder = new ArrayModelBinder<int>(new SimpleTypeModelBinder(typeof(int)));

            // Act
            await binder.BindModelAsync(bindingContext);

            // Assert
            Assert.True(bindingContext.Result.IsModelSet);

            var array = Assert.IsType<int[]>(bindingContext.Result.Model);
            Assert.Equal(new[] { 42, 84 }, array);
        }

        public async Task BindModel_NoInputFormatterFound_SetsModelStateError_RespectsBinderModelName()
        {
            // Arrange
            var provider = new TestModelMetadataProvider();
            provider.ForType<Person>().BindingDetails(d => d.BindingSource = BindingSource.Body);

            var bindingContext = GetBindingContext(typeof(Person), metadataProvider: provider);
            bindingContext.BinderModelName = "custom";

            var binder = CreateBinder();

            // Act
            var binderResult = await binder.BindModelResultAsync(bindingContext);

            // Assert

            // Returns non-null because it understands the metadata type.
            Assert.NotNull(binderResult);
            Assert.False(binderResult.IsModelSet);
            Assert.Null(binderResult.Model);

            // Key is the bindermodelname because this was a top-level binding.
            var entry = Assert.Single(bindingContext.ModelState);
            Assert.Equal("custom", entry.Key);
            Assert.Single(entry.Value.Errors);
        }

        public async Task BindModel_NoInputFormatterFound_SetsModelStateError()
        {
            // Arrange
            var provider = new TestModelMetadataProvider();
            provider.ForType<Person>().BindingDetails(d => d.BindingSource = BindingSource.Body);

            var bindingContext = GetBindingContext(typeof(Person), metadataProvider: provider);

            var binder = bindingContext.OperationBindingContext.ModelBinder;

            // Act
            var binderResult = await binder.BindModelAsync(bindingContext);

            // Assert

            // Returns non-null because it understands the metadata type.
            Assert.NotNull(binderResult);
            Assert.False(binderResult.IsModelSet);
            Assert.Null(binderResult.Model);

            // Key is empty because this was a top-level binding.
            var entry = Assert.Single(bindingContext.ModelState);
            Assert.Equal(string.Empty, entry.Key);
            Assert.Single(entry.Value.Errors);
        }

        public async Task ProcessAsync_GeneratesExpectedOutput()
        {
            // Arrange
            var expectedTagName = "not-div";
            var metadataProvider = new TestModelMetadataProvider();
            var htmlGenerator = new TestableHtmlGenerator(metadataProvider);

            var validationSummaryTagHelper = new ValidationSummaryTagHelper(htmlGenerator)
            {
                ValidationSummary = ValidationSummary.All,
            };

            var expectedPreContent = "original pre-content";
            var expectedContent = "original content";
            var tagHelperContext = new TagHelperContext(
                allAttributes: new ReadOnlyTagHelperAttributeList<IReadOnlyTagHelperAttribute>(
                    Enumerable.Empty<IReadOnlyTagHelperAttribute>()),
                items: new Dictionary<object, object>(),
                uniqueId: "test",
                getChildContentAsync: useCachedResult =>
                {
                    var tagHelperContent = new DefaultTagHelperContent();
                    tagHelperContent.SetContent("Something");
                    return Task.FromResult<TagHelperContent>(tagHelperContent);
                });
            var output = new TagHelperOutput(
                expectedTagName,
                attributes: new TagHelperAttributeList
                {
                    { "class", "form-control" }
                });
            output.PreContent.SetContent(expectedPreContent);
            output.Content.SetContent(expectedContent);
            output.PostContent.SetContent("Custom Content");

            Model model = null;
            var viewContext = TestableHtmlGenerator.GetViewContext(model, htmlGenerator, metadataProvider);
            validationSummaryTagHelper.ViewContext = viewContext;

            // Act
            await validationSummaryTagHelper.ProcessAsync(tagHelperContext, output);

            // Assert
            Assert.Equal(2, output.Attributes.Count);
            var attribute = Assert.Single(output.Attributes, attr => attr.Name.Equals("class"));
            Assert.Equal("form-control validation-summary-valid", attribute.Value);
            attribute = Assert.Single(output.Attributes, attr => attr.Name.Equals("data-valmsg-summary"));
            Assert.Equal("true", attribute.Value);
            Assert.Equal(expectedPreContent, output.PreContent.GetContent());
            Assert.Equal(expectedContent, output.Content.GetContent());
            Assert.Equal("Custom Content<ul><li style=\"display:none\"></li>" + Environment.NewLine + "</ul>",
                         output.PostContent.GetContent());
            Assert.Equal(expectedTagName, output.TagName);
        }

        public void GetTypeNames_ReturnsExpectedResults(Type fieldType, string[] expectedResult)
        {
            // Arrange
            var metadataProvider = new TestModelMetadataProvider();
            var metadata = metadataProvider.GetMetadataForType(fieldType);

            // Act
            var typeNames = TemplateRenderer.GetTypeNames(metadata, fieldType);

            // Assert
            var collectionAssertions = expectedResult.Select<string, Action<string>>(expected =>
                actual => Assert.Equal(expected, actual));
            Assert.Collection(typeNames, collectionAssertions.ToArray());
        }

        public void EnterNestedScope_CopiesProperties()
        {
            // Arrange
            var bindingContext = new DefaultModelBindingContext
            {
                Model = new object(),
                ModelMetadata = new TestModelMetadataProvider().GetMetadataForType(typeof(object)),
                ModelName = "theName",
                OperationBindingContext = new OperationBindingContext(),
                ValueProvider = new SimpleValueProvider(),
                ModelState = new ModelStateDictionary(),
            };

            var metadataProvider = new TestModelMetadataProvider();
            metadataProvider.ForType<object>().BindingDetails(d =>
                {
                    d.BindingSource = BindingSource.Custom;
                    d.BinderType = typeof(TestModelBinder);
                    d.BinderModelName = "custom";
                });

            var newModelMetadata = metadataProvider.GetMetadataForType(typeof(object));

            // Act
            var originalBinderModelName = bindingContext.BinderModelName;
            var originalBindingSource = bindingContext.BindingSource;
            var originalModelState = bindingContext.ModelState;
            var originalOperationBindingContext = bindingContext.OperationBindingContext;
            var originalValueProvider = bindingContext.ValueProvider;

            var disposable = bindingContext.EnterNestedScope(
                modelMetadata: newModelMetadata,
                fieldName: "fieldName",
                modelName: "modelprefix.fieldName",
                model: null);

            // Assert
            Assert.Same(newModelMetadata.BinderModelName, bindingContext.BinderModelName);
            Assert.Same(newModelMetadata.BindingSource, bindingContext.BindingSource);
            Assert.Equal("fieldName", bindingContext.FieldName);
            Assert.False(bindingContext.IsTopLevelObject);
            Assert.Null(bindingContext.Model);
            Assert.Same(newModelMetadata, bindingContext.ModelMetadata);
            Assert.Equal("modelprefix.fieldName", bindingContext.ModelName);
            Assert.Same(originalModelState, bindingContext.ModelState);
            Assert.Same(originalOperationBindingContext, bindingContext.OperationBindingContext);
            Assert.Same(originalValueProvider, bindingContext.ValueProvider);

            disposable.Dispose();
        }

        public async Task CanCreateModel_ReturnsTrue_IfIsTopLevelObjectAndNotIsFirstChanceBinding(
            bool isTopLevelObject,
            bool isFirstChanceBinding,
            string binderModelName,
            string modelName,
            bool expectedCanCreate)
        {
            var mockValueProvider = new Mock<IValueProvider>();
            mockValueProvider
                .Setup(o => o.ContainsPrefixAsync(It.IsAny<string>()))
                .Returns(Task.FromResult(false));

            var metadataProvider = new TestModelMetadataProvider();
            var bindingContext = new MutableObjectBinderContext
            {
                ModelBindingContext = new ModelBindingContext
                {
                    IsTopLevelObject = isTopLevelObject,
                    IsFirstChanceBinding = isFirstChanceBinding,

                    // Random type.
                    ModelMetadata = metadataProvider.GetMetadataForType(typeof(Person)),
                    ValueProvider = mockValueProvider.Object,
                    OperationBindingContext = new OperationBindingContext
                    {
                        ValueProvider = mockValueProvider.Object,
                        MetadataProvider = metadataProvider,
                        ValidatorProvider = Mock.Of<IModelValidatorProvider>(),
                    },

                    // CanCreateModel() ignores the BinderModelName and ModelName properties.
                    BinderModelName = binderModelName,
                    ModelName = modelName,
                },
            };

            var mutableBinder = new TestableMutableObjectModelBinder();
            bindingContext.PropertyMetadata =
                mutableBinder.GetMetadataForProperties(bindingContext.ModelBindingContext).ToArray();

            // Act
            var canCreate = await mutableBinder.CanCreateModel(bindingContext);

            // Assert
            Assert.Equal(expectedCanCreate, canCreate);
        }