在MVC 3创建自定义数据注解验证 [英] Creating custom data annotation validation in MVC 3

问题描述

举例来说，我有一个员工视图模型。当创建一个员工，我要验证的用户名，以确保它不存在。

For instance, I have an Employee view model. When creating an employee, I want to validate the username to make sure it doesn't exist.

public class EmployeeViewModel
{
    [ScaffoldColumn(false)]
    public int EmployeeId { get; set; }

    [ValidateDuplicate(ErrorMessage = "That username already exists")]
    [Required(ErrorMessage = "Username is required")]
    [DisplayName("Username")]
    public string Username { get; set; }
}

再有我ValidateDuplicate功能某处与code，检查是否有重复的。

And then have my ValidateDuplicate function somewhere with the code to check for a duplicate.

这可能吗？

推荐答案

我建议在看<一个href=\"http://davidhayden.com/blog/dave/archive/2011/01/04/ASPNETMVC3RemoteValidationTutorial.aspx\">remote验证。中的例子，即使符合你的情况。

I would suggest looking at remote validation. The example even matches your case.

基本上，远程属性添加到您的视图模型属性指向一个控制器动作

Basically, add the remote attribute to your viewmodel property that points to a controller action

[Remote("IsUserExists", "Account", ErrorMessage = "Can't add what already exists!")]
[Required(ErrorMessage = "Username is required")]
[DisplayName("Username")]
public string Username { get; set; }

该做的工作。

public ActionResult IsUserExists(string userName) 
{
 if (!UserService.UserNameExists(userName) || (CurrentUser.UserName == userName))
 {
      return "Ok.";
 }
}

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