There is a class that has 12 properties, which may be mandatory, optional or non-existent depending on the business rule specified in the registration of another class.
How would I be able to compile a View that displays only the required and optional fields?
I thought of using reflection , having a list of fields with names identical to the property, sweeping these fields in View . Is there any other way to implement this?
In your Model implement the Interface IValidatableObject .
public class MyModel : IValidatableObject
public int Propriedade1 { get; set; }
public int Propriedade2 { get; set; }
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
if(Propriedade1 <= 0)
yield return new ValidationResult("Propriedade menor ou igual a 0", new List<string> { "Propriedade1" } ); //Um yield return para cada validação.
}
The Validate result will be displayed by jQueryValidator, using @Html.ValidationMessageFor() ;
Another solution would be to create a ViewModel with the attributes that should or should not be written:
namespace MyProject.ViewModels {
public class MyViewModel {
public int Prop1 { get; set; }
[Required]
public String Prop2 { get; set; }
public String Prop3 { get; set; }
public String Prop4 { get; set; }
...
public String Prop12 { get; set; }
}
}
Your View receives, instead of the Model itself, the filled ViewModel:
@model MyProject.ViewModels.MyViewModel
...
Your Controller receives the ViewModel in the POST request and populates a ViewModel in GET:
public ActionResult Create()
{
var viewModel = new MyViewModel();
return View(viewModel);
}
//
// POST: /Cities/Create
[HttpPost]
public ActionResult Create(MyViewModel viewModel)
{
if (ModelState.IsValid)
{
var model = new Model {
Prop1 = viewModel.Prop1,
Prop2 = viewModel.Prop2,
Prop3 = viewModel.Prop3,
...
Prop12 = viewModel.Prop12
};
context.Models.Add(model);
context.SaveChanges();
return RedirectToAction("Index");
}
return View(viewModel);
}
First, mark in your model which properties are required using Attribute [Required] :
public class MyModel {
[Key]
public int MyModelId {get;set;}
[Required]
public String Description {get;set;}
}
Inside the View, you can use the following code:
@foreach (var propertyInfo in Model.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy))
{
var requiredAttribute = (RequiredAttribute)propertyInfo.GetCustomAttributes(typeof(RequiredAttribute), true).FirstOrDefault();
if (requiredAttribute != null)
{
/* Escreva um campo para a property */
}
}