Custom Model Binder中的DataAnnotations验证

2019年8月1日 132次阅读

我已经在我的MVC项目中为List编写了一个自定义模型绑定器,但我现在陷入了如何使这个绑定器验证我的DataAnnotations验证属性.

我在互联网上发现了一些关于类似场景的帖子,但我找不到任何适用于我特定场景的内容.

型号粘合剂代码：

    public class QuestionModelBinder : IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        List<QuestionEditModel> res = new List<QuestionEditModel>();
        var form = controllerContext.HttpContext.Request.Form;
        int i = 0;
        while (!string.IsNullOrEmpty(form["Questions[" + i + "].QuestionID"]))
        {
            var p = new QuestionEditModel();
            p.QuestionID = form["Questions[" + i + "].QuestionID"];
            p.Answer = form["Questions[" + i + "].Answer"];
            p.AnswerRequired = (form["Questions[" + i + "].AnswerRequired"] == "True") ? true : false;
            p.completedBy = form["Questions[" + i + "].completedBy"];
            p.completedOn=NullableParser.ParseNullableDateTime(form["Questions[" + i + "].CompletedOn"]);
            p.DefaultText = form["Questions[" + i + "].DefaultText"];
            p.EntryType = form["Questions[" + i + "].EntryType"];
            p.HelpText = form["Questions[" + i + "].HelpText"];
            p.OptionRequired = (form["Questions[" + i + "].OptionRequired"] == "True") ? true : false;
            p.OptionValue = NullableParser.ParseNullableInt(form["Questions[" + i + "].OptionValue"]);
            p.QuestionName = form["Questions[" + i + "].QuestionName"];
            p.QuestionText = form["Questions[" + i + "].QuestionText"];
            res.Add(p);
            i++;
        }

        return res;
    }

    private bool HasGenericTypeBase(System.Type type, System.Type genericType)
    {
    while (type != typeof(object))
    {
        if (type.IsGenericType && type.GetGenericTypeDefinition() == genericType) return true;
        type = type.BaseType;
    }

    return false;        
    }

}

我的模型元数据：

    [MetadataType(typeof(QuestionEditModelMetaData))]
public partial class QuestionEditModel { }


public class QuestionEditModelMetaData
{
    [Required]
    public string QuestionID { get; set; }
    [Required]
    public string QuestionName { get; set; }
    [Required]
    public string QuestionText { get; set; }
    [Required]
    public string DefaultText { get; set; }
    [Required]
    public string EntryType { get; set; }
    [Required]
    public string HelpText { get; set; }

    public Boolean AnswerRequired { get; set; }
    public Boolean OptionRequired { get; set; }

    //[RequiredIfTrue("AnswerRequired")]
    [Required]
    public string Answer { get; set; }

    [RequiredIfTrue("OptionRequired")]
    public int? OptionValue { get; set; }

    public string completedBy { get; set; }
    public DateTime? completedOn { get; set; }

    public List<Option> options { get; set; }

}

RequiredIfTrue属性来自MVC Foolproof Validation库.显然它不够万无一失！

最佳答案 这里的解决方案有效.

Custom model binding, model state, and data annotations

CreateModel选项让生活变得非常简单.

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