[英]Custom Validation Attribute for three levels deep model
Hi I have a situation in witch I have to create some custom validation attributes because the way my model is created.The model looks something like this: 嗨,我有一个女巫的情况,我必须创建一些自定义验证属性,因为创建模型的方式如下所示:
public class EvaluationFormDataContract
{
public int StudentAssignmentInstanceId { get; set; }
public int EvaluationType { get; set; }
public List<CategoriesOnEvaluationDataContract> Categories { get; set; }
}
public class CategoriesOnEvaluationDataContract
{
public string Memo { get; set; }
public int CategoryId { get; set; }
public List<QuestionsOnEvalCategoryDataContract> Questions { get; set; }
// Fields needed for validation
public bool? HasMemo { get; set; }
public bool MemoIsMandatory { get; set; }
}
public class QuestionsOnEvalCategoryDataContract
{
public string Memo { get; set; }
public string Grade { get; set; }
public int QuestionId { get; set; }
// Fields needed for validation
public bool HasGrade { get; set; }
public bool HasMemo { get; set; }
public bool ShowOnlyMemo { get; set; }
}
As it can be seem the model is composed two levels deep. 看起来该模型由两个层次组成。 And I will have to validate starting from the second level , where I will check if the model HasMemo and if MemoIsMandatory.
我将必须从第二个级别开始进行验证,在第二个级别中,我将检查模型HasMemo和MemoIsMandatory。
The third validation should be done at the 3rd level where I have to check if it HasGrade and HasMemo. 第三次验证应在第3层完成,我必须检查它是否具有HasGrade和HasMemo。
Normaly if it were up to me I would split this in three separate calls to the server but we are depending on an legacy project and for the moment I have to make this work. 通常,如果由我决定,我会将其分为三个对服务器的单独调用,但是我们依赖于一个旧项目,目前我必须进行这项工作。
The post action will be called via an ajax call and will have all this data into it. 将通过ajax调用来调用post操作,并将所有这些数据放入其中。
Now my question is where should I add the validation attribute? 现在我的问题是我应该在哪里添加验证属性?
Should it be added at the top on Categories , making it directly responsible for all the levels of the model? 是否应该将其添加到Categories的顶部,使其直接负责模型的所有级别?
Or I should place it on each model and find a way to make the data binder aware of it? 或者我应该将其放置在每个模型上,并找到一种使数据绑定器意识到它的方法? If so how can I do this?
如果可以,我该怎么做?
You can do both. 两者都可以。 If you implement
System.ComponentModel.DataAnnotations.IValidatableObject
interface at the top-most level, you can do whatever you want with the properties in the entire graph and return the errors. 如果在最顶层实现
System.ComponentModel.DataAnnotations.IValidatableObject
接口,则可以对整个图形中的属性执行任何所需的操作,并返回错误。
public class EvaluationFormDataContract : IValidatableObject
{
// All properties go here
public IEnumerable<ValidationResult> Validate(
ValidationContext validationContext)
{
if (// do what you want)
yield return new ValidationResult("message");
}
}
Or, you can apply attributes at the lower levels and automatically binding takes care of validating the properties in the graph. 或者,您可以在较低级别应用属性,并且自动绑定将负责验证图形中的属性。 You don't need to do anything special.
您不需要做任何特别的事情。
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