/// <summary>
/// Creates parameter validators.
/// </summary>
/// <param name="parameterInfo">The parameter info of the parameter for which to create the validator.</param>
/// <param name="parameterValue">The parameter value.</param>
/// <returns>The created validator.</returns>
/// <remarks>
/// The parameter validator must know the actual type of the parameter value.
/// EL has a bug where they get the type of the parameter from the parameter info instead of the parameter itself -
/// the parameter may be of a derived type of the formal parameter.
/// </remarks>
static Validator CreateParameterValidator(
ParameterInfo parameterInfo,
object parameterValue)
{
if (parameterInfo == null)
{
throw new ArgumentNullException(nameof(parameterInfo));
}
var parameterElement = new MetadataValidatedParameterElement();
// gets the validators metadata
parameterElement.UpdateFlyweight(parameterInfo);
// compositions all validators
var compositeBuilder = new CompositeValidatorBuilder(parameterElement);
foreach (var descriptor in parameterElement.GetValidatorDescriptors())
{
// get the type of the parameter either from the parameter value or from the parameter info if the value is null
compositeBuilder.AddValueValidator(
descriptor.CreateValidator(
parameterValue != null
? parameterValue.GetType()
: parameterInfo.ParameterType,
null,
null,
ValidationFactory.DefaultCompositeValidatorFactory));
}
// returns all validators
return(compositeBuilder.GetValidator());
}
public void ShouldReturnDescriptorsWhenUpdatedWithParameterInfo()
{
MetadataValidatedParameterElement validatedElement = new MetadataValidatedParameterElement();
validatedElement.UpdateFlyweight(GetMethod1NameParameterInfo());
Assert.IsNull(validatedElement.MemberInfo);
Assert.IsNull(validatedElement.TargetType);
Assert.AreEqual(CompositionType.And, validatedElement.CompositionType);
Assert.IsFalse(validatedElement.IgnoreNulls);
List<IValidatorDescriptor> descriptors =
new List<IValidatorDescriptor>(validatedElement.GetValidatorDescriptors());
Assert.AreEqual(3, descriptors.Count);
// reflection doesn't preserve ordering of attributes. Therefore,
// it doesn't preserve ordering of validators. Is this an issue?
Assert.IsTrue(descriptors.Exists(delegate(IValidatorDescriptor d)
{
return d is NotNullValidatorAttribute;
}));
Assert.IsTrue(descriptors.Exists(delegate(IValidatorDescriptor d)
{
return d is StringLengthValidatorAttribute;
}));
Assert.IsTrue(descriptors.Exists(delegate(IValidatorDescriptor d)
{
return d is RegexValidatorAttribute;
}));
}
public void ShouldReturnDescriptorsWhenUpdatedWithParameterInfo()
{
MetadataValidatedParameterElement validatedElement = new MetadataValidatedParameterElement();
validatedElement.UpdateFlyweight(GetMethod1NameParameterInfo());
Assert.IsNull(validatedElement.MemberInfo);
Assert.IsNull(validatedElement.TargetType);
Assert.AreEqual(CompositionType.And, validatedElement.CompositionType);
Assert.IsFalse(validatedElement.IgnoreNulls);
List <IValidatorDescriptor> descriptors =
new List <IValidatorDescriptor>(validatedElement.GetValidatorDescriptors());
Assert.AreEqual(3, descriptors.Count);
// reflection doesn't preserve ordering of attributes. Therefore,
// it doesn't preserve ordering of validators. Is this an issue?
Assert.IsTrue(descriptors.Exists(delegate(IValidatorDescriptor d)
{
return(d is NotNullValidatorAttribute);
}));
Assert.IsTrue(descriptors.Exists(delegate(IValidatorDescriptor d)
{
return(d is StringLengthValidatorAttribute);
}));
Assert.IsTrue(descriptors.Exists(delegate(IValidatorDescriptor d)
{
return(d is RegexValidatorAttribute);
}));
}
public static Validator CreateValidator(ParameterInfo paramInfo)
{
MetadataValidatedParameterElement validatedElement = new MetadataValidatedParameterElement();
validatedElement.UpdateFlyweight(paramInfo);
CompositeValidatorBuilder builder = new CompositeValidatorBuilder(validatedElement);
foreach (IValidatorDescriptor descriptor in validatedElement.GetValidatorDescriptors())
{
builder.AddValueValidator(descriptor.CreateValidator(paramInfo.ParameterType, null, null));
}
return builder.GetValidator();
}