动态添加属性到模型MVC4 [英] Dynamically add a property to model MVC4

问题描述

我是MVC新手，我的要求是我需要设置添加字段来查看。所以为此我做了一个简单的viewmodel，并把我想要渲染的字段。但我不知道如何动态地向类中添加属性。如果发生这种情况，那么我也会简单地整合它。



例如我有一个联系我们的表单，其中包括firstname，lastname等字段。我需要为管理员提供一个设施，系统应该允许他们添加一个新字段以便联系我们表格，如中间名，

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,

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; }

    }

推荐答案

您可以在System.Reflection命名空间下使用ExpandOObject。



一个简短的例子是

You can use ExpandOObject under System.Reflection namespace.

A short example is

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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