ASP.NET MVC 3数据注释：动态添加验证 [英] ASP.NET MVC 3 Data Annotation: Add validation dynamically

问题描述

我是新的数据注释。我想知道是否可能（以及如何）动态添加一些验证。解释为什么是非常广泛的，但是我有一个ViewModel在创建时接收和对象。在这个对象中，我必须检查一些属性，并根据其值应该有或没有一些验证。

一个例子：

  public class ProfileViewModel 
 {
 [必需（ErrorMessage =需要字段{0}）] 
 [Display（Name = 客户端代码）] 
 public int ClientCode {get;组; } 
 
 [必需（ErrorMessage =需要字段{0}）] 
 [StringLength（100，ErrorMessage =字段{0}最多可以有100个字符。 ）] 
 [Display（Name =Company）] 
 public string Company {get;组; } 
 
 [StringLength（50，ErrorMessage =字段{0}最多可以包含50个字符。）] 
 [Display（Name =Name）] 
 public string Name {get;组; } 
 
 [StringLength（50，ErrorMessage =字段{0}最多可以有50个字符。）] 
 [Display（Name =LastName）] 
 public string LastName {get;组; 
 
 public ProfileViewModel（User usr）
 {
 if（usuario.ClientCode！= null）
 {
 ClientCode = Convert.ToInt32（usr。 ClientCode）; 
} 
 else 
 {
 //尚未要求ClientCode和Company。 
 //现在需要Name和LastName。 
} 
公司= usr.Company; 
 Name = usr.Name; 
 LastName = usr.LastName; 
} 
} 
  

解决方案

认为最简单的做法就是实现 IValidatableObject ：

  public class Product：IValidatableObject 
 {
 public int Prop1 {get;组; } 
 public int Prop2 {get;组; } 
 
 public IEnumerable&ValidationResult>验证（ValidationContext validationContext）
 {
 if（Prop1< Prop2）
 yield返回新的ValidationResult（Property 1不能小于Property 2）; 
} 
} 
  

另请参见：类级别模型验证与.. ASP.NET MVC 3

I'm new with data annotation. I'd like to know if it possible (and how) to add some validation dynamically. It is very extensive to explain why, but I've a ViewModel that receives and object when created. In that object I must check for some property and depending its value I should have or not some validations.

An example:

public class ProfileViewModel
{
    [Required(ErrorMessage = "The field {0} is required")]
    [Display(Name = "Client Code")]
    public int ClientCode { get; set; }

    [Required(ErrorMessage = "The field {0} is required")]
    [StringLength(100, ErrorMessage = "The field {0} must have up to 100 characters.")]
    [Display(Name = "Company")]
    public string Company { get; set; }

    [StringLength(50, ErrorMessage = "The field {0} must have up to 50 characters.")]
    [Display(Name = "Name")]
    public string Name { get; set; }

    [StringLength(50, ErrorMessage = "The field {0} must have up to 50 characters.")]
    [Display(Name = "LastName")]
    public string LastName { get; set; }

    public ProfileViewModel(User usr)
    {
        if (usuario.ClientCode != null)
        {
            ClientCode = Convert.ToInt32(usr.ClientCode);
        }
        else
        {
             //ClientCode and Company are not yet required.
             //Name and LastName are now required.
        }
        Company = usr.Company;
        Name = usr.Name;
        LastName = usr.LastName;
    }
}

解决方案

I think that the simplest way of doing what I wanted is implementing IValidatableObject:

public class Product : IValidatableObject
{
    public int Prop1 { get; set; }
    public int Prop2 { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if (Prop1 < Prop2)
            yield return new ValidationResult("Property 1 can't be less than Property 2");
    }
}

See also: Class-Level Model Validation with ... ASP.NET MVC 3

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