从客户端验证属性获取对象

Question

我在客户端验证属性中有下一个“AddValidation”方法（继承自ValidationAttribute，IClientModelValidator）

public void AddValidation(ClientModelValidationContext context)
    {
        var viewContext = context.ActionContext as ViewContext;
        var modelType = context.ModelMetadata.ContainerType;
        var model = viewContext?.ViewData.Model;
        var maxDate = (DateTime?)modelType.GetProperty(_maxDateName)?.GetValue(model, null);
        var minDate = (DateTime?)modelType.GetProperty(_minDateName)?.GetValue(model, null);
         var errorMessage = string.Format(ErrorMessageString, minDate?.ToString("MM/dd/yyyy"), maxDate?.ToString("MM/dd/yyyy"));
        
        context.Attributes.Add("data-val-preliminaryraterangedate", errorMessage);
        context.Attributes.Add("data-val-preliminaryraterangedate-rangedates",
            JsonConvert.SerializeObject(new {MaxDateName = $"#{_maxDateName}", MinDateName = $"#{_minDateName}"}));
    }

如何获取模型对象以获取属性值？仅当模型对象包含原始类型时，此示例才适用。并且不能使用包含复杂类型的模型对象

Answer 1

您可以通过model直接获取该属性，但需要指定其类型。

下面是一个演示：

型号：

public class TimeModel
{
    public string Name { get; set; }
    public MyTime MyTime { get; set; }
}
public class MyTime
{
    [Ranges]
    public DateTime RangeDatetime { get; set; }
}

范围属性：

public class RangesAttribute : ValidationAttribute, IClientModelValidator
{
    public void AddValidation(ClientModelValidationContext context)
    {
        var viewContext = context.ActionContext as ViewContext;
        var modelType = context.ModelMetadata.ContainerType;
        var model = (TimeModel)viewContext?.ViewData.Model;
        var name = model.Name;
        var rangeDatetime = model.MyTime.RangeDatetime
        //...
    }
}

控制器：

public IActionResult Index()
{
    TimeModel model = new TimeModel
    {
        Name = "AAAAA",
        MyTime = new MyTime {  RangeDatetime = DateTime.Now}
    };

    return View(model);
}

结果：

更新：

public void AddValidation(ClientModelValidationContext context)
{
    var viewContext = context.ActionContext as ViewContext;
    var model = viewContext.ViewData.Model;
    Dictionary<string, string> myDict = new Dictionary<string, string>();
    Type type = model.GetType();
    foreach (PropertyInfo pi in type.GetProperties())
    {
        var subModel = pi.GetValue(model, null);
        Type subtype = pi.GetValue(model, null).GetType();
        if (!subtype.IsPrimitive && !subtype.Equals(typeof(string)))
        {
            var pii = subtype.GetProperties();
            foreach (PropertyInfo item in pii)
            {
                myDict[item.Name] = item.GetValue(subModel, null)?.ToString();
            }
        }
        else
        {
            myDict[pi.Name] = pi.GetValue(model, null)?.ToString();
        }
    }
}

Answer 2

var viewContext = context.ActionContext as ViewContext;
        var modelType = context.ModelMetadata.ContainerType;
        var instance = viewContext?.ViewData.Model;
        var model = instance?.GetType().Name == modelType.Name
            ? instance
            : instance?.GetType()?.GetProperties().First(x => x.PropertyType.Name == modelType.Name)
                .GetValue(instance, null);
        var maxDate = (DateTime?)modelType.GetProperty(_maxDateName)?.GetValue(model, null);
        var minDate = (DateTime?)modelType.GetProperty(_minDateName)?.GetValue(model, null);
         var errorMessage = string.Format(ErrorMessageString, minDate?.ToString("MM/dd/yyyy"), maxDate?.ToString("MM/dd/yyyy"));
        
        context.Attributes.Add("data-val-preliminaryraterangedate", errorMessage);
        context.Attributes.Add("data-val-preliminaryraterangedate-rangedates",
            JsonConvert.SerializeObject(new {MaxDateName = $"#{_maxDateName}", MinDateName = $"#{_minDateName}"}));

您可以从context.ModelMetadata.ContainerType; 获取您需要的类型并将其与父模型属性类型进行比较