前段时间我发表的关于ＭＶＣ架构中对验证方式的设计，收到了不少朋友的留言，意思是说过于复杂，复用性不高，当然我的出发点是减少实体部门的代码量。
最近在朋友的建议下，看了另一种验证方式，事实上就是ＭＶＣ实例中提供的实体属性验证方式，为每个视图加一个视图模型，对视图模型中的属性进行特性的
约束即可。具体如下：
WEB UI可能是这样
<%using (Html.BeginForm())
{ %> <%=Html.LabelFor(model=>model.Name) %> <%=Html.TextBoxFor(model=>model.Name) %> <%=Html.ValidationMessageFor(model=>model.Name) %> <%=Html.LabelFor(model=>model.Age) %> <%=Html.TextBoxFor(model => model.Age)%> <%=Html.ValidationMessageFor(model => model.Age)%> <input type="submit" value="Save" /> <%} %>Model可能是这样
namespace Web.Models
{ public class PersonModels { [Required("RequiredField", "Name")] public string Name { get; set; } [Range(18, int.MaxValue, "GreaterThan", "Age", 18)] public int Age { get; set; } [Range(int.MinValue, 160, "LessThan", "Weight", 160)] public double Weight { get; set; } [Required("EmailField", "Email")] [Email("EmailField", "Email")] public string Email { get; set; } }}而controller可能是这样
[HttpPost]
public ActionResult Index(FormCollection form) { if (this.ModelState.IsValid) { // 验证通过的逻辑 Response.Output.Write("<script>alert('验证通过');</script>"); } return View(); }最后实体具一类可能是这样
namespace Web.Mvc.Extensions
{ /// <summary> /// 通用验证基类 /// </summary> public abstract class EntityValidationAttribute : ValidationAttribute { public EntityValidationAttribute(string messageId, params object[] args) : base(() => MessageManager.Current.GetMessage(messageId, args)) { } #region Protected Property protected Regex rLetters { get { return new Regex("[a-zA-Z]{1,}"); } } /// <summary> /// 验证数字 /// </summary> protected Regex rDigit { get { return new Regex("[0-9]{1,}"); } } /// <summary> /// 验证邮编 /// </summary> protected Regex rPostNumber { get { return new Regex("^[0-9]{3,14}$"); } } /// <summary> /// 验证手机 /// </summary> protected Regex rMobile { get { return new Regex(@"^1[3|4|5|8][0-9]\d{8}$"); } } /// <summary> /// 验证电话 /// </summary> protected Regex rTelePhone { get { return new Regex(@"^[0-9]{2,4}-\d{6,8}$"); } } /// <summary> /// 验证传真 /// </summary> protected Regex rFex { get { return new Regex(@"/^[0-9]{2,4}-\d{6,8}$"); } } /// <summary> /// 验证Email /// </summary> protected Regex rEmail { get { return new Regex(@"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"); } } #endregion } /// <summary> /// 为空验证 /// </summary> [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)] public class RequiredAttribute : EntityValidationAttribute { public bool AllowEmptyStrings { get; set; } public RequiredAttribute(string messageId, params object[] args) : base(messageId, args) { } public override bool IsValid(object value) { return new System.ComponentModel.DataAnnotations.RequiredAttribute { AllowEmptyStrings = this.AllowEmptyStrings }.IsValid(value); } } /// <summary> /// 范围验证 /// </summary> [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)] public class RangeAttribute : EntityValidationAttribute { private System.ComponentModel.DataAnnotations.RangeAttribute innerRangeAttribute; public RangeAttribute(double minimum, double maximum, string messageId, params object[] args) : base(messageId, args) { innerRangeAttribute = new System.ComponentModel.DataAnnotations.RangeAttribute(minimum, maximum); } public RangeAttribute(int minimum, int maximum, string messageId, params object[] args) : base(messageId, args) { innerRangeAttribute = new System.ComponentModel.DataAnnotations.RangeAttribute(minimum, maximum); } public RangeAttribute(Type type, string minimum, string maximum, string messageId, params object[] args) : base(messageId, args) { innerRangeAttribute = new System.ComponentModel.DataAnnotations.RangeAttribute(type, minimum, maximum); } public override bool IsValid(object value) { return innerRangeAttribute.IsValid(value); } } /// <summary> /// Email验证 /// </summary> [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)] public class EmailAttribute : EntityValidationAttribute { public EmailAttribute(string messageId, params object[] args) : base(messageId, args) { } public override bool IsValid(object value) { if (value == null) return false; else return rEmail.IsMatch(value.ToString()); } } /// <summary> /// 消息类 /// </summary> public class MessageManager { static Dictionary<string, string> messages = new Dictionary<string, string>(); static MessageManager() { messages.Add("RequiredField", "这个 \"{0}\"字段是必填的!"); messages.Add("GreaterThan", "这个 \"{0}\" 字段的值必须大于 \"{1}\"!"); messages.Add("LessThan", "这个 \"{0}\" 字段的值必须小于 \"{1}\"!"); messages.Add("EmailField", "这个 \"{0}\" 字段不是有效的Email地址!"); } /// <summary> /// 得到验证异常的消息集合 /// 对外公开 /// </summary> /// <param name="messageId">异常消息ID</param> /// <param name="args">消息参数集合</param> /// <returns></returns> public string GetMessage(string messageId, params object[] args) { return string.Format(CultureInfo.CurrentCulture, messages[messageId], args); } /// <summary> /// 本类的实例对象 /// </summary> public static MessageManager Current = new MessageManager(); }}