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Hi,


I am new to MVC, and My requirement is I need to make a facility of adding fields to view. So for that I made a simple viewmodel, and put the fields which I want to render. but I dont know how to add a property to a class dynamically. If that happens then I will simply integrate that too.

e.g. I have a contact us form with fields like firstname, lastname etc. and i need to provide a facility to admin that system should allow them to add a new field for contact us form like middlename,

C#
public class ContactInput 
    {

        [Required]
        [StringLength(100)]
        [Display(Order = 1)]
        public virtual string Name { get; set; }

        [Required]
        [DataType(DataType.EmailAddress)]
        [StringLength(254)]
        [RegularExpression(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*")]
        [Display(Order = 2)]
        public virtual string Email { get; set; }

        [Required]
        [StringLength(254)]
        [Display(Order = 3)]
        public virtual string Subject { get; set; }

        [Required]
        [StringLength(2000)]
        [DataType(DataType.MultilineText)]
        [Display(Order = 4)]
        public virtual string Message { get; set; }

        [Required]
        [StringLength(2000)]
        [DataType(DataType.MultilineText)]
        [Display(Order = 5)]
        public virtual string Comments { get; set; }

    }
Posted
Comments
Govindaraj Rangaraj 1-Oct-13 9:24am    
How about adding all the required fields into the model class and in the view hide them based on a flag (create flag for each property). When the admin set the flag for this field make it visible in the view.
amolpatil2243 1-Oct-13 9:46am    
If Property addition to class will be possible then that could also be done in that way. I think so, I am not sure.
Govindaraj Rangaraj 1-Oct-13 9:58am    
I meant you dont need to add property dynamically, add them statically along with flags and hide them at runtime based on the flag.
amolpatil2243 1-Oct-13 11:00am    
fields are not defined, Need to add dynamically. implementing CMS

1 solution

You can use ExpandOObject under System.Reflection namespace.

A short example is

C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection.Emit;
using System.Dynamic;

namespace Home
{
    class Program
    {
        static void Main(string[] args)
        {
            DynamicClass dc = new DynamicClass();
            dynamic dynObj = dc.MethodA();
            Console.WriteLine(dynObj.Name); //Using your dynamic properties.
            Console.ReadLine();


        }
    }
    class DynamicClass
    {
        public dynamic MethodA()
        {
            dynamic dynamicObj = new ExpandoObject();
            dynamicObj.Name = "Hi"; //Your own property, you can have any number of properties similar to this. 

            
            return dynamicObj;
        }
    }
}
 
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