SO-37161202 DropDownList and ViewBag | C# Online Compiler

SO-37161202 DropDownList and ViewBag by Stephen Muecke

using System;
using System.ComponentModel.DataAnnotations;

namespace HelloWorldMvcApp
{
	public class SampleViewModel
	{
		public int CustomerA { get; set; }
		public int CustomerB { get; set; }
		public int CustomerC { get; set; }

	}
}

Model

​x
 
using System;
using System.ComponentModel.DataAnnotations;
​
namespace HelloWorldMvcApp
{
    public class SampleViewModel
    {
        public int CustomerA { get; set; }
        public int CustomerB { get; set; }
        public int CustomerC { get; set; }
​
    }
}

@model HelloWorldMvcApp.SampleViewModel
@{
	Layout = null;
}

<!DOCTYPE html>
<!-- template from http://getbootstrap.com/getting-started -->

<html lang="en">
	<head>
		<meta charset="utf-8">
		<meta http-equiv="X-UA-Compatible" content="IE=edge">
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<title>Bootstrap 101 Template</title>

		<!-- CSS Includes -->
		<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
		
		<style type="text/css">

			.field-validation-error {
				color: #ff0000;
			}

		</style>
	</head>
	
	<body>
		<div class="container">
			<div class="col-md-6 col-md-offset-3">
				<h1>Hello Stranger</h1>
			
				
	
				@using (Html.BeginForm())
				{
					<div>Using the same name for both the model and ViewBag property and the DropDownListFor method. The value of CustomerA is "Client 2" but it is not selected</div>
					<div class="form-group">
						@Html.LabelFor(m => m.CustomerA)
						@Html.DropDownListFor(m => m.CustomerA, (IEnumerable<SelectListItem>)ViewBag.CustomerA, "Please select", new { @class="form-control"}) 
						@Html.ValidationMessageFor(m => m.CustomerA)
					</div>
					<div>Using the same name for both the model and ViewBag property and the DropDownList method. There is no client side validation</div>
					<div class="form-group">
						@Html.LabelFor(m => m.CustomerB)
						@Html.DropDownList("CustomerB", (IEnumerable<SelectListItem>)ViewBag.CustomerB, "Please select", new { @class="form-control"}) 
						@Html.ValidationMessageFor(m => m.CustomerB)
					</div>
					<div>Using different name for both the model and ViewBag property and the DropDownListFor method. The correct option is selected and there is client side validation</div>

					<div class="form-group">
						@Html.LabelFor(m => m.CustomerC)
						@Html.DropDownListFor(m => m.CustomerC, (IEnumerable<SelectListItem>)ViewBag.CustomerCList, "Please select", new { @class="form-control"}) 
						@Html.ValidationMessageFor(m => m.CustomerC)
					</div>
				
					<button type="submit" class="btn btn-success submit">Submit</button>
				}

			</div>
		</div>

		<!-- JS includes -->
		<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
		<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
	
		<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
		<script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>
		
		<script type="text/javascript">

		</script>
	</body>
</html>

View

 
@model HelloWorldMvcApp.SampleViewModel
@{
    Layout = null;
}
​
<!DOCTYPE html>
<!-- template from http://getbootstrap.com/getting-started -->
​
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Bootstrap 101 Template</title>
​
        <!-- CSS Includes -->
        <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
        
        <style type="text/css">
​
            .field-validation-error {
                color: #ff0000;
            }
​
        </style>
    </head>
    
    <body>
        <div class="container">
            <div class="col-md-6 col-md-offset-3">
                <h1>Hello Stranger</h1>
            
                
    
                @using (Html.BeginForm())
                {
                    <div>Using the same name for both the model and ViewBag property and the DropDownListFor method. The value of CustomerA is "Client 2" but it is not selected</div>
                    <div class="form-group">
                        @Html.LabelFor(m => m.CustomerA)
                        @Html.DropDownListFor(m => m.CustomerA, (IEnumerable<SelectListItem>)ViewBag.CustomerA, "Please select", new { @class="form-control"}) 
                        @Html.ValidationMessageFor(m => m.CustomerA)
                    </div>
                    <div>Using the same name for both the model and ViewBag property and the DropDownList method. There is no client side validation</div>
                    <div class="form-group">
                        @Html.LabelFor(m => m.CustomerB)
                        @Html.DropDownList("CustomerB", (IEnumerable<SelectListItem>)ViewBag.CustomerB, "Please select", new { @class="form-control"}) 
                        @Html.ValidationMessageFor(m => m.CustomerB)
                    </div>
                    <div>Using different name for both the model and ViewBag property and the DropDownListFor method. The correct option is selected and there is client side validation</div>
​
                    <div class="form-group">
                        @Html.LabelFor(m => m.CustomerC)
                        @Html.DropDownListFor(m => m.CustomerC, (IEnumerable<SelectListItem>)ViewBag.CustomerCList, "Please select", new { @class="form-control"}) 
                        @Html.ValidationMessageFor(m => m.CustomerC)
                    </div>
                
                    <button type="submit" class="btn btn-success submit">Submit</button>
                }
​
            </div>
        </div>
​
        <!-- JS includes -->
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
        <script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
    
        <script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
        <script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>
        
        <script type="text/javascript">
​
        </script>
    </body>
</html>
​

using System;
using System.Web.Mvc;
using System.Collections.Generic;

namespace HelloWorldMvcApp
{
	public class HomeController : Controller
	{
		[HttpGet]
		public ActionResult Index()
		{
			ViewBag.CustomerA = new List<SelectListItem>
			{
				new SelectListItem(){ Value = "1", Text = "Customer 1" },
				new SelectListItem(){ Value = "2", Text = "Customer 2" }
			};
			ViewBag.CustomerB = new List<SelectListItem>
			{
				new SelectListItem(){ Value = "1", Text = "Customer 1" },
				new SelectListItem(){ Value = "2", Text = "Customer 2" }
			};
			ViewBag.CustomerCList = new List<SelectListItem>
			{
				new SelectListItem(){ Value = "1", Text = "Customer 1" },
				new SelectListItem(){ Value = "2", Text = "Customer 2" }
			};
			var model = new SampleViewModel()
			{
				CustomerA = 2,
				CustomerB = 2,
				CustomerC = 2
			};
			return View(model);
		}
		
		[HttpPost]
		public ActionResult Index(SampleViewModel model)
		{
			return View(model);
		}

		
	}
}

Controller

 
using System;
using System.Web.Mvc;
using System.Collections.Generic;
​
namespace HelloWorldMvcApp
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            ViewBag.CustomerA = new List<SelectListItem>
            {
                new SelectListItem(){ Value = "1", Text = "Customer 1" },
                new SelectListItem(){ Value = "2", Text = "Customer 2" }
            };
            ViewBag.CustomerB = new List<SelectListItem>
            {
                new SelectListItem(){ Value = "1", Text = "Customer 1" },
                new SelectListItem(){ Value = "2", Text = "Customer 2" }
            };
            ViewBag.CustomerCList = new List<SelectListItem>
            {
                new SelectListItem(){ Value = "1", Text = "Customer 1" },
                new SelectListItem(){ Value = "2", Text = "Customer 2" }
            };
            var model = new SampleViewModel()
            {
                CustomerA = 2,
                CustomerB = 2,
                CustomerC = 2
            };
            return View(model);
        }
        
        [HttpPost]
        public ActionResult Index(SampleViewModel model)
        {
            return View(model);
        }
​
        
    }
}

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