using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
namespace Utilities.ExceptionHandler
{
public class CustomRule
{
[JsonConstructor]
public CustomRule(string name, string description)
{
Name = name;
Description = description;
ErrorCategory = CustomRuleEnum.Validation.ToStringValue();
}
public CustomRule(string errorCategory, string name, string description)
{
ErrorCategory = errorCategory;
Name = name;
Description = description;
}
public string ErrorCategory { get; set; }
public string Name { get; set; }
public string Description { get; set; }
}
public enum CustomRuleEnum
{
[StringValue("General")]
General,
// Use this for pre-processing checks; e.g. before any database activity
[StringValue("Validation")]
Validation,
// Use this for any post checks cause from a data related issue after trying to process a request
[StringValue("Data")]
Data
}
public class StringValueAttribute : Attribute
{
public StringValueAttribute(string value)
{
Value = value;
}
public string Value { get; protected set; }
}
public static class ExtensionHelper
{
/// <summary>
/// https://cisart.wordpress.com/2013/09/11/string-value-attribute-for-enums/
/// Example Enum to String:
/// TestEnum test = TestEnum.Value2;
/// string str = test.ToStringValue();
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public static string ToStringValue(this Enum value)
{
var attributes =
(StringValueAttribute[])
value.GetType().GetField(value.ToString()).GetCustomAttributes(typeof(StringValueAttribute), false);
return ((attributes.Length > 0)) ? attributes[0].Value : value.ToString();
}
}
public class CustomValidationException : System.Exception
{
public IEnumerable<CustomRule> CustomRules;
public CustomValidationException(string message, IEnumerable<CustomRule> customRules)
: base(message)
{
CustomRules = customRules;
}
public CustomValidationException(string message)
: base(message)
{
}
public CustomValidationException(string message, System.Exception inner)
: base(message, inner)
{
}
}
}
// apply on class
public bool IsValid()
{
return !CustomRules().Any();
}
public IEnumerable<CustomRule> CustomRules()
{
if (string.IsNullOrWhiteSpace(Name))
yield return new CustomRule("MissingName", "Test name is required.");
}
// apply on service method
// validation
if (!dbTest.IsValid())
throw new CustomValidationException("Validation Error", dbTest.CustomRules());
