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