c# - ASP.NET MVC 条件验证

Question

如何使用数据标注对模型进行条件验证？

例如，假设我们有以下模型(Person 和 Senior):

public class Person
{
    [Required(ErrorMessage = "*")]
    public string Name
    {
        get;
        set;
    }

    public bool IsSenior
    {
        get;
        set;
    }

    public Senior Senior
    {
        get;
        set;
    }
}

public class Senior
{
    [Required(ErrorMessage = "*")]//this should be conditional validation, based on the "IsSenior" value
    public string Description
    {
        get;
        set;
    }
}

以及以下 View :

<%= Html.EditorFor(m => m.Name)%>
<%= Html.ValidationMessageFor(m => m.Name)%>

<%= Html.CheckBoxFor(m => m.IsSenior)%>
<%= Html.ValidationMessageFor(m => m.IsSenior)%>

<%= Html.CheckBoxFor(m => m.Senior.Description)%>
<%= Html.ValidationMessageFor(m => m.Senior.Description)%>

我想成为基于“IsSenior”属性选择的“Senior.Description”属性条件必填字段(true -> required)。如何在 ASP.NET MVC 2 中使用数据注释实现条件验证？

Answer 1

有一种更好的方法可以在 MVC3 中添加条件验证规则；让您的模型继承 IValidatableObject 并实现 Validate 方法:

public class Person : IValidatableObject
{
    public string Name { get; set; }
    public bool IsSenior { get; set; }
    public Senior Senior { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) 
    { 
        if (IsSenior && string.IsNullOrEmpty(Senior.Description)) 
            yield return new ValidationResult("Description must be supplied.");
    }
}

阅读更多信息 Introducing ASP.NET MVC 3 (Preview 1) .