Is a way to validate business objects in easy and simplified manner.
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
namespace DataAnnotations
{
class Program
{
static void Main(string[] args)
{
Customer cust = new Customer();
try
{
cust.name = "";//It will throw exception
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
cust.name = "TestName";
cust.number = "1234567890";//here length is 11 and requird max length is 10
ValidationContext context = new ValidationContext(cust);
List<ValidationResult> vResults = new List<ValidationResult>();
bool isValid = Validator.TryValidateObject(cust, context, vResults, true);
foreach (ValidationResult vResult in vResults)
{
Console.WriteLine(vResult.ErrorMessage);
}
Console.WriteLine("Customer Validation: {0}", isValid);
}
}
public class Customer
{
private string _name;
//Traditional way
public string name
{
get { return _name; }
set
{
if (value.Length == 0)
{
throw new Exception("Name is required !");
}
_name = value;
}
}
private string _number;
//Through data annotation
[Required(ErrorMessage = "Number is required !")]
[StringLength(10, ErrorMessage = "Length should be <= 10")]
public string number
{
get { return _number; }
set { _number = value; }
}
}
}
