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();
}
}
本文转自博客园张占岭（仓储大叔）的博客，原文链接：MVC中的统一验证机制~续，如需转载请自行联系原博主。
