Timothy's Space 君看一叶舟，出没风波里

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace CommonLib
{
    public static class EntityValidator
    {
        public static ValidateResult Validate(this T target,
                                              Predicate predicate,
                                              string errorMessage)
        {
            var result = new ValidateResult(target);
 
            if (!predicate(target))
            {
                result.Errors.Add(errorMessage);
            }
 
            return result;
        }
 
        public static ValidateResult Validate(this ValidateResult target,
                                              Predicate predicate,
                                              string errorMessage)
        {
 
            if (!predicate(target.Entity))
            {
                target.Errors.Add(errorMessage);
            }
 
            return target;
        }
    }
 
    public class ValidateResult
    {
        internal List Errors { get; set; }
        internal T Entity { get; private set; }
        public bool HasErrors
        {
            get { return Errors.Count > 0; }
        }
 
        internal ValidateResult(T entity)
        {
            Errors = new List();
 
            Entity = entity;
        }
 
        public string[] ErrorMessages { get { return Errors.ToArray(); } }
    }
}

ValidateResult validateResult =
                        content.Validate(c => !string.IsNullOrEmpty(c.Name), "Name为空")
                               .Validate(c => c.MobilePhone.Length == 11 , "MobilePhone长度不正确")
                               .Validate(c => c.Age >= 10), "年龄不在规定范围")
                               .Validate(c => c.Height <= 200 && c.Height >= 180, "身高不符合标准");
 
                    if (validateResult.HasErrors)
                    {
                        log.Info("实体验证失败:");
                        validateResult.ErrorMessages.ForEach(p => log.Info(p));
                        return null;
                    }