MVC Model验证

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Model类中可以添加的验证标记：

1. 必填字段

[Required]

public string FirstName { get; set; }

2. 字段长度

至多n位：

[StringLength(160)]

public string FirstName { get; set; }

要求至少n位：

[StringLength(160, MinimumLength=3)]

public string FirstName { get; set; }

3. 正则验证

[RegularExpression(@”[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}”)]

public string Email { get; set; }

4. 范围

[Range(35,44)]

public int Age { get; set; }

小数的情况：

[Range(typeof(decimal), “0.00”, “49.99”)]

public decimal Price { get; set; }

5. 服务端参与的验证

[Remote(“CheckUserName”, “Account”)]

public string UserName { get; set; }

然后在AccountController里指定一个CheckUserName方法：

public JsonResult CheckUserName(string username)
{
    var result = Membership.FindUsersByName(username).Count == 0;
    return Json(result, JsonRequestBehavior.AllowGet);
}

6. 比较

[RegularExpression(@”[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}”)]

public string Email { get; set; }

[Compare(“Email”)]

public string EmailConfirm { get; set; }

7. 自定义错误消息

正则：

[RegularExpression(@”[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}”,

                   ErrorMessage=”Email doesn’t look like a valid email address.”)]

public string Email { get; set; }

普通文本：

[Required(ErrorMessage=”Your last name is required”)]

[StringLength(160, ErrorMessage=”Your last name is too long”)]

public string LastName { get; set; }

占位符：

[Required(ErrorMessage=”Your {0} is required.”)]

[StringLength(160, ErrorMessage=”{0} is too long.”)]

public string LastName { get; set; }

三、后台Action的写法

Action里要做的有两件事：判断ModelState是否合法、添加错误消息。MVC3模板自带的登录Action如下：

[HttpPost]
public ActionResult LogOn(LogOnModel model, string returnUrl)
{
    if (ModelState.IsValid)
    {
        if (Membership.ValidateUser(model.UserName, model.Password))
        {
            FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
            if (Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/")
                && !returnUrl.StartsWith("//") && !returnUrl.StartsWith("/\\"))
            {
                return Redirect(returnUrl);
            }
            else
            {
                return RedirectToAction("Index", "Home");
            }
        }
        else
        {
            ModelState.AddModelError("", "The user name or password provided is incorrect.");
        }
    }
 
    // If we got this far, something failed, redisplay form
    return View(model);
}

MVC Model验证

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原文地址：http://www.cnblogs.com/zqlblog/p/4173740.html