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

问题描述

我是新的数据诠释。我想知道，如果有可能（以及如何）来动态添加一些验证。这是非常广泛的，解释为什么，但创造了当我接收一个视图模型和对象。在该对象我必须检查某些属性，并根据其价值，我应该已经或不是一些验证。

一个例子：

 公共类ProfileViewModel
{
    [必需（的ErrorMessage =字段{0}要求）]
    [显示（名称=客户端code）]
    公众诠释客户code {搞定;组; }    [必需（的ErrorMessage =字段{0}要求）]
    [StringLength（100的ErrorMessage =字段{0}必须有最多100个字符。）
    [显示（名称=公司）]
    公共字符串公司{搞定;组; }    [StringLength（50的ErrorMessage =字段{0}必须有超过50个字符。）
    [显示（名称=名称）]
    公共字符串名称{;组; }    [StringLength（50的ErrorMessage =字段{0}必须有超过50个字符。）
    [显示（名称=姓氏）]
    公共字符串名字{获得;组; }    公共ProfileViewModel（用户USR）
    {
        如果（usuario.Client code！= NULL）
        {
            客户端code = Convert.ToInt32（usr.Client code）;
        }
        其他
        {
             //还没有要求客户端code和公司。
             //现在需要的名称和姓氏。
        }
        公司= usr.Company;
        NAME = usr.Name;
        姓氏= usr.LastName;
    }
}
 

解决方案

我觉得我想要做的最简单的方法是实施<一个href=\"http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.ivalidatableobject.validate%28v=vs.110%29.aspx\"相对=nofollow> IValidatableObject ：

 公共类产品：IValidatableObject
{
    公众诠释为prop1 {搞定;组; }
    公众诠释Prop2 {搞定;组; }    公共IEnumerable的＆LT;＆为ValidationResult GT;验证（ValidationContext validationContext）
    {
        如果（为prop1＆LT; Prop2）
            产量返回新的ValidationResult（财产1不能小于房产2）;
    }
}
 

参见：<一href=\"http://weblogs.asp.net/scottgu/class-level-model-validation-with-ef-$c$c-first-and-asp-net-mvc-3\"相对=nofollow>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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