如何进行子对象自定义验证mvc3

时间:2012-09-28 05:17:28

标签: c# asp.net .net asp.net-mvc-3

我有一个对象(标题),它有一个子对象(详细信息)列表,我希望在接受数据之前进行自定义验证。我已经尝试过ModelState.IsValid和TryValidateModel,但它似乎没有触发子对象上的Validate方法(只有头对象)。

因此,在提交时,我看到标题的验证火,但不是子对象。然后,如果我执行TryValidateModel,我再次看到(断点)验证方法在标题上调用,但不在子对象上调用。

带注释的验证(必须是数字等)似乎在处理子对象,而不是通过IValidatableObject接口添加的自定义逻辑。任何帮助将不胜感激。

3 个答案:

答案 0 :(得分:1)

我创建了一个属性([ValidateObject]),它将验证你在课堂上放置的属性,就像你认为的那样。

public class Personne
{
    [ValidateObject]
    public Address Address { get; set; }
    //[...]
}

(地址是一个自定义类。)

它可用于验证:

  • 模型上的对象属性。 (如上所述)
  • 子对象的集合。

    [ValidateObject]
    public List<Address> Address { get; set; }
    
  • 它支持多层次的部门,如果&#34;地址&#34;有一种类型&#34; ZipCode&#34;使用属性[ValidateObject],它将验证tho。

代码:

public class ValidateObjectAttribute : ValidationAttribute
{
    public ValidateObjectAttribute()
    {

    }
    private ValidationContext ValidationContext { get; set; }
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        this.ValidationContext = validationContext;
        var results = new List<ValidationResult>();

        try
        {
            var isIterable = this.IsIterable(value);
            if (isIterable)
            {
                int currentItemPosition = -1;
                foreach (var objectToValidate in value as IEnumerable<object>)
                {
                    currentItemPosition++;
                    var resultTemp = ValidationsForObject(objectToValidate, true, currentItemPosition);
                    if (resultTemp != null)
                        results.AddRange(resultTemp);

                }
                if (results.Count <= 0)
                    results = null;
            }
            else
                results = ValidationsForObject(value);

            if (results != null)
            {
                //Build a validation result 
                List<string> memberNames = new List<string>();
                results.ForEach(r => memberNames.AddRange(r.MemberNames));

                var compositeResultsReturn = new CompositeValidationResult($"Validation for {validationContext.DisplayName} failed!", memberNames.AsEnumerable());
                results.ForEach(r => compositeResultsReturn.AddResult(r));

                return compositeResultsReturn;
            }

        }
        catch (Exception) { }

        return ValidationResult.Success;
    }

    private List<ValidationResult> ValidationsForObject (object objectToValidate, bool IsIterable = false, int position = -1)
    {
        var results = new List<ValidationResult>();
        var contextTemp = new ValidationContext(objectToValidate, null, null);
        var resultsForThisItem = new List<ValidationResult>();

        var isValid = Validator.TryValidateObject(objectToValidate, contextTemp, resultsForThisItem, true);
        if (isValid)
            return null;

        foreach (var validationResult in resultsForThisItem)
        {
            List<string> propNames = new List<string>();// add prefix to properties
            foreach (var nameOfProp in validationResult.MemberNames)
            {
                if (IsIterable)
                    propNames.Add($"{this.ValidationContext.MemberName}[{position}].{nameOfProp}");
                else
                    propNames.Add($"{this.ValidationContext.MemberName}.{nameOfProp}");
            }
            var customFormatValidation = new ValidationResult(validationResult.ErrorMessage, propNames);
            results.Add(customFormatValidation);
        }       

        return results;
    }


    private bool IsIterable(object value)
    {
        ////COULD WRITE THIS, but its complicated to debug...
        //if (value.GetType().GetInterfaces().Any(
        //i => i.IsGenericType &&
        //i.GetGenericTypeDefinition() == typeof(IEnumerable<>)))
        //{
        //    // foreach...
        //}
        Type valueType = value.GetType();
        var interfaces = valueType.GetInterfaces();
        bool isIterable = false;
        foreach (var i in interfaces)
        {
            var isGeneric = i.IsGenericType;
            bool isEnumerable = i.GetGenericTypeDefinition() == typeof(IEnumerable<>);
            isIterable = isGeneric && isEnumerable;
            if (isIterable)
                break;
        }
        return isIterable;
    }
}

public class CompositeValidationResult : ValidationResult
{
    private readonly List<ValidationResult> _results = new List<ValidationResult>();

    public IEnumerable<ValidationResult> Results
    {
        get
        {
            return _results;
        }
    }

    public CompositeValidationResult(string errorMessage) : base(errorMessage)
    {
    }

    public CompositeValidationResult(string errorMessage, IEnumerable<string> memberNames) : base(errorMessage, memberNames)
    {
    }

    protected CompositeValidationResult(ValidationResult validationResult) : base(validationResult)
    {
    }

    public void AddResult(ValidationResult validationResult)
    {
        _results.Add(validationResult);
    }
}

如果你的模型被正确绑定,这将有效:)

您可能希望添加必需属性,确保该对象本身不为null。

[Required]

希望有所帮助!

答案 1 :(得分:0)

我想知道你的root对象是否有阻止子验证的错误。 见Recursive validation using annotations and IValidatableObject 此URL提及该场景以及强制从根

对子项进行验证的代码

根据从根对象

触发验证的帖子

  public IEnumerable Validate(ValidationContext validationContext)
    {
        var context = new ValidationContext(this.Details, validationContext.ServiceContainer, validationContext.Items);
        var results = new List();
        Validator.TryValidateObject(this.Details, context, results);
        return results;
    }

答案 2 :(得分:0)

TryValidateObject似乎没有触发自定义验证,只触发数据注释?我通过执行以下操作,将详细信息验证添加到标头验证中:

foreach (var detail in this.Details)
{
   var validationResults = detail.Validate(validationContext);
   foreach (var validationResult in validationResults)
   {
      yield return validationResult;
   }
}

这在验证方面起作用,但UI没有显示错误消息。即使我在UI上有ValidationMessagesFor。

验证无法解决此问题:MVC3 Master-Details Validation not Displaying