Get object from client validation attribute - asp.net

Question

I have next "AddValidation" method in client validation attribute (inherited from 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}"}));
}
How can I get model object to get the properties values? This example is good only if model object contains primitive types. And cannot work with model object that contains complex type

Answer 1

You can directly get the property by model, but you need specify its type.
Below is a demo:
Model:
public class TimeModel
{
public string Name { get; set; }
public MyTime MyTime { get; set; }
}
public class MyTime
{
[Ranges]
public DateTime RangeDatetime { get; set; }
}
RangesAttribute:
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
//...
}
}
Controller:
public IActionResult Index()
{
TimeModel model = new TimeModel
{
Name = "AAAAA",
MyTime = new MyTime { RangeDatetime = DateTime.Now}
};
return View(model);
}
Result:
Update:
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}"}));
You can get type that you need from context.ModelMetadata.ContainerType; and compare it with parent model property type