76 lines
3.4 KiB
C#
76 lines
3.4 KiB
C#
namespace System.Web.Mvc {
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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public class DataErrorInfoModelValidatorProvider : ModelValidatorProvider {
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public override IEnumerable<ModelValidator> GetValidators(ModelMetadata metadata, ControllerContext context) {
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if (metadata == null) {
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throw new ArgumentNullException("metadata");
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}
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if (context == null) {
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throw new ArgumentNullException("context");
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}
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return GetValidatorsImpl(metadata, context);
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}
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private static IEnumerable<ModelValidator> GetValidatorsImpl(ModelMetadata metadata, ControllerContext context) {
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// If the metadata describes a model that implements IDataErrorInfo, we should call its
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// Error property at the appropriate time.
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if (TypeImplementsIDataErrorInfo(metadata.ModelType)) {
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yield return new DataErrorInfoClassModelValidator(metadata, context);
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}
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// If the metadata describes a property of a container that implements IDataErrorInfo,
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// we should call its Item indexer at the appropriate time.
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if (TypeImplementsIDataErrorInfo(metadata.ContainerType)) {
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yield return new DataErrorInfoPropertyModelValidator(metadata, context);
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}
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}
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private static bool TypeImplementsIDataErrorInfo(Type type) {
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return typeof(IDataErrorInfo).IsAssignableFrom(type);
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}
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internal sealed class DataErrorInfoClassModelValidator : ModelValidator {
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public DataErrorInfoClassModelValidator(ModelMetadata metadata, ControllerContext controllerContext)
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: base(metadata, controllerContext) {
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}
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public override IEnumerable<ModelValidationResult> Validate(object container) {
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IDataErrorInfo castModel = Metadata.Model as IDataErrorInfo;
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if (castModel != null) {
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string errorMessage = castModel.Error;
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if (!String.IsNullOrEmpty(errorMessage)) {
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return new ModelValidationResult[] {
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new ModelValidationResult() { Message = errorMessage }
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};
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}
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}
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return Enumerable.Empty<ModelValidationResult>();
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}
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}
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internal sealed class DataErrorInfoPropertyModelValidator : ModelValidator {
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public DataErrorInfoPropertyModelValidator(ModelMetadata metadata, ControllerContext controllerContext)
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: base(metadata, controllerContext) {
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}
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public override IEnumerable<ModelValidationResult> Validate(object container) {
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IDataErrorInfo castContainer = container as IDataErrorInfo;
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if (castContainer != null && !String.Equals(Metadata.PropertyName, "error", StringComparison.OrdinalIgnoreCase)) {
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string errorMessage = castContainer[Metadata.PropertyName];
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if (!String.IsNullOrEmpty(errorMessage)) {
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return new ModelValidationResult[] {
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new ModelValidationResult() { Message = errorMessage }
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};
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}
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}
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return Enumerable.Empty<ModelValidationResult>();
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}
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}
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}
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}
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