You can subclass HandleErrorAttribute and override its OnException member (no need to copy) so that it logs the exception with ELMAH and only if the base implementation handles it. The minimal amount of code you need is as follows:
using System.Web.Mvc;
using Elmah;
public class HandleErrorAttribute : System.Web.Mvc.HandleErrorAttribute
{
public override void OnException(ExceptionContext context)
{
base.OnException(context);
if (!context.ExceptionHandled)
return;
var httpContext = context.HttpContext.ApplicationInstance.Context;
var signal = ErrorSignal.FromContext(httpContext);
signal.Raise(context.Exception, httpContext);
}
}
The base implementation is invoked first, giving it a chance to mark the exception as being handled. Only then is the exception signaled. The above code is simple and may cause issues if used in an environment where the HttpContext may not be available, such as testing. As a result, you will want code that is that is more defensive (at the cost of being slightly longer):
using System.Web;
using System.Web.Mvc;
using Elmah;
public class HandleErrorAttribute : System.Web.Mvc.HandleErrorAttribute
{
public override void OnException(ExceptionContext context)
{
base.OnException(context);
if (!context.ExceptionHandled // if unhandled, will be logged anyhow
|| TryRaiseErrorSignal(context) // prefer signaling, if possible
|| IsFiltered(context)) // filtered?
return;
LogException(context);
}
private static bool TryRaiseErrorSignal(ExceptionContext context)
{
var httpContext = GetHttpContextImpl(context.HttpContext);
if (httpContext == null)
return false;
var signal = ErrorSignal.FromContext(httpContext);
if (signal == null)
return false;
signal.Raise(context.Exception, httpContext);
return true;
}
private static bool IsFiltered(ExceptionContext context)
{
var config = context.HttpContext.GetSection("elmah/errorFilter")
as ErrorFilterConfiguration;
if (config == null)
return false;
var testContext = new ErrorFilterModule.AssertionHelperContext(
context.Exception,
GetHttpContextImpl(context.HttpContext));
return config.Assertion.Test(testContext);
}
private static void LogException(ExceptionContext context)
{
var httpContext = GetHttpContextImpl(context.HttpContext);
var error = new Error(context.Exception, httpContext);
ErrorLog.GetDefault(httpContext).Log(error);
}
private static HttpContext GetHttpContextImpl(HttpContextBase context)
{
return context.ApplicationInstance.Context;
}
}
This second version will try to use error signaling from ELMAH first, which involves the fully configured pipeline like logging, mailing, filtering and what have you. Failing that, it attempts to see whether the error should be filtered. If not, the error is simply logged. This implementation does not handle mail notifications. If the exception can be signaled then a mail will be sent if configured to do so.
You may also have to take care that if multiple HandleErrorAttribute instances are in effect then duplicate logging does not occur, but the above two examples should get your started.
In case you were still looking for an overview of the validation strings, below you can find thethe resources from System.ComponentModel.DataAnnotations.Resources.DataAnnotationsResources class as Tz_ mentioned:
[ArgumentIsNullOrWhitespace, The argument '{0}' cannot be null, empty or contain only white space.]
[AssociatedMetadataTypeTypeDescriptor_MetadataTypeContainsUnknownProperties, The associated metadata type for type '{0}' contains the following unknown properties or fields: {1}. Please make sure that the names of these members match the names of the properties on the main type.]
[AttributeStore_Type_Must_Be_Public, The type '{0}' must be public.]
[AttributeStore_Unknown_Method, The type '{0}' does not contain a public method named '{1}'.]
[AttributeStore_Unknown_Property, The type '{0}' does not contain a public property named '{1}'.]
[Common_NullOrEmpty, Value cannot be null or empty.]
[Common_PropertyNotFound, The property {0}.{1} could not be found.]
[CompareAttribute_MustMatch, '{0}' and '{1}' do not match.]
[CompareAttribute_UnknownProperty, Could not find a property named {0}.]
[CreditCardAttribute_Invalid, The {0} field is not a valid credit card number.]
[CustomValidationAttribute_Method_Must_Return_ValidationResult, The CustomValidationAttribute method '{0}' in type '{1}' must return System.ComponentModel.DataAnnotations.ValidationResult. Use System.ComponentModel.DataAnnotations.ValidationResult.Success to represent success.]
[CustomValidationAttribute_Method_Not_Found, The CustomValidationAttribute method '{0}' does not exist in type '{1}' or is not public and static.]
[CustomValidationAttribute_Method_Required, The CustomValidationAttribute.Method was not specified.]
[CustomValidationAttribute_Method_Signature, The CustomValidationAttribute method '{0}' in type '{1}' must match the expected signature: public static ValidationResult {0}(object value, ValidationContext context). The value can be strongly typed. The ValidationContext parameter is optional.]
[CustomValidationAttribute_Type_Conversion_Failed, Could not convert the value of type '{0}' to '{1}' as expected by method {2}.{3}.]
[CustomValidationAttribute_Type_Must_Be_Public, The custom validation type '{0}' must be public.]
[CustomValidationAttribute_ValidationError, {0} is not valid.]
[CustomValidationAttribute_ValidatorType_Required, The CustomValidationAttribute.ValidatorType was not specified.]
[DataTypeAttribute_EmptyDataTypeString, The custom DataType string cannot be null or empty.]
[DisplayAttribute_PropertyNotSet, The {0} property has not been set. Use the {1} method to get the value.]
[EmailAddressAttribute_Invalid, The {0} field is not a valid e-mail address.]
[EnumDataTypeAttribute_TypeCannotBeNull, The type provided for EnumDataTypeAttribute cannot be null.]
[EnumDataTypeAttribute_TypeNeedsToBeAnEnum, The type '{0}' needs to represent an enumeration type.]
[FileExtensionsAttribute_Invalid, The {0} field only accepts files with the following extensions: {1}]
[LocalizableString_LocalizationFailed, Cannot retrieve property '{0}' because localization failed. Type '{1}' is not public or does not contain a public static string property with the name '{2}'.]
[MaxLengthAttribute_InvalidMaxLength, MaxLengthAttribute must have a Length value that is greater than zero. Use MaxLength() without parameters to indicate that the string or array can have the maximum allowable length.]
[MaxLengthAttribute_ValidationError, The field {0} must be a string or array type with a maximum length of '{1}'.]
[MetadataTypeAttribute_TypeCannotBeNull, MetadataClassType cannot be null.]
[MinLengthAttribute_InvalidMinLength, MinLengthAttribute must have a Length value that is zero or greater.]
[MinLengthAttribute_ValidationError, The field {0} must be a string or array type with a minimum length of '{1}'.]
[PhoneAttribute_Invalid, The {0} field is not a valid phone number.]
[RangeAttribute_ArbitraryTypeNotIComparable, The type {0} must implement {1}.]
[RangeAttribute_MinGreaterThanMax, The maximum value '{0}' must be greater than or equal to the minimum value '{1}'.]
[RangeAttribute_Must_Set_Min_And_Max, The minimum and maximum values must be set.]
[RangeAttribute_Must_Set_Operand_Type, The OperandType must be set when strings are used for minimum and maximum values.]
[RangeAttribute_ValidationError, The field {0} must be between {1} and {2}.]
[RegexAttribute_ValidationError, The field {0} must match the regular expression '{1}'.]
[RegularExpressionAttribute_Empty_Pattern, The pattern must be set to a valid regular expression.]
[RequiredAttribute_ValidationError, The {0} field is required.]
[StringLengthAttribute_InvalidMaxLength, The maximum length must be a nonnegative integer.]
[StringLengthAttribute_ValidationError, The field {0} must be a string with a maximum length of {1}.]
[StringLengthAttribute_ValidationErrorIncludingMinimum, The field {0} must be a string with a minimum length of {2} and a maximum length of {1}.]
[UIHintImplementation_ControlParameterKeyIsNotAString, The key parameter at position {0} with value '{1}' is not a string. Every key control parameter must be a string.]
[UIHintImplementation_ControlParameterKeyIsNull, The key parameter at position {0} is null. Every key control parameter must be a string.]
[UIHintImplementation_ControlParameterKeyOccursMoreThanOnce, The key parameter at position {0} with value '{1}' occurs more than once.]
[UIHintImplementation_NeedEvenNumberOfControlParameters, The number of control parameters must be even.]
[UrlAttribute_Invalid, The {0} field is not a valid fully-qualified http, https, or ftp URL.]
[ValidationAttribute_Cannot_Set_ErrorMessage_And_Resource, Either ErrorMessageString or ErrorMessageResourceName must be set, but not both.]
[ValidationAttribute_IsValid_NotImplemented, IsValid(object value) has not been implemented by this class. The preferred entry point is GetValidationResult() and classes should override IsValid(object value, ValidationContext context).]
[ValidationAttribute_NeedBothResourceTypeAndResourceName, Both ErrorMessageResourceType and ErrorMessageResourceName need to be set on this attribute.]
[ValidationAttribute_ResourcePropertyNotStringType, The property '{0}' on resource type '{1}' is not a string type.]
[ValidationAttribute_ResourceTypeDoesNotHaveProperty, The resource type '{0}' does not have an accessible static property named '{1}'.]
[ValidationAttribute_ValidationError, The field {0} is invalid.]
[ValidationContext_Must_Be_Method, The ValidationContext for the type '{0}', member name '{1}' must provide the MethodInfo.]
[ValidationContextServiceContainer_ItemAlreadyExists, A service of type '{0}' already exists in the container.]
[Validator_InstanceMustMatchValidationContextInstance, The instance provided must match the ObjectInstance on the ValidationContext supplied.]
[Validator_Property_Value_Wrong_Type, The value for property '{0}' must be of type '{1}'.]
(MVC 4, .NET 4.0)
Best Answer
Using the standard data annotation, No. You must specify the MaximumLength. Only the other parameters are optional.
In such a case, I'd recommend something like this:
You can also use a Regex (regular expression) attribute like this one:
More on this here: Password Strength Validation with Regular Expressions