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using System.ComponentModel.DataAnnotations;

namespace Nancy.Demo
{
	public class Customer
	{
		[Required]
		public int? Id { get; set; }

		[StringLength(10)]
		public string Name { get; set; }
	}
}

Model

​x
 
using System.ComponentModel.DataAnnotations;
​
namespace Nancy.Demo
{
    public class Customer
    {
        [Required]
        public int? Id { get; set; }
​
        [StringLength(10)]
        public string Name { get; set; }
    }
}

<html>
  <head>
    <title>Customers</title>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<!-- CSS Includes -->
	<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">

  </head>
  <body>
	<nav class="navbar navbar-default">
		<div class="container-fluid">
			<div class="navbar-header">
				<a class="navbar-brand" href="#">Customers</a>
			</div>
		</div>
	</nav>
	<div class="container">	
		
		<div class="panel panel-default">
		    <div class="panel-heading">List of in memory customer items.</div>
			<div class="panel-body">

				<ul class="list-group">
				@foreach(var customer in Model)
				{
					<li class="list-group-item"><b>@customer.Name</b> with Id @customer.Id</li>
				}
				</ul>

			</div>
		</div>
			
		<form method="POST" action="@Url.Content("~/add")" class="navbar-form">
		  	<h2>Add a new customer to in memory list</h2>
		  	<small>Please note that customer will be added to list, but as it doesn't save anywhere it won't be remembered between calls<br/></small>
			<div class="form-group">
		  	<input type="text" name="Id" class="form-control" placeholder="Enter Id..." /><br/>
			</div>
			<div class="form-group">
		  	<input type="text" name="Name" class="form-control" placeholder="Enter Name..." /><br/>
			</div>
		  	<input type="submit" class="btn btn-primary" value="Add"/><br/>
	    </form>
	</div>
  </body>
</html>

View

 
<html>
  <head>
    <title>Customers</title>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- CSS Includes -->
    <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
​
  </head>
  <body>
    <nav class="navbar navbar-default">
        <div class="container-fluid">
            <div class="navbar-header">
                <a class="navbar-brand" href="#">Customers</a>
            </div>
        </div>
    </nav>
    <div class="container"> 
        
        <div class="panel panel-default">
            <div class="panel-heading">List of in memory customer items.</div>
            <div class="panel-body">
​
                <ul class="list-group">
                @foreach(var customer in Model)
                {
                    <li class="list-group-item"><b>@customer.Name</b> with Id @customer.Id</li>
                }
                </ul>
​
            </div>
        </div>
            
        <form method="POST" action="@Url.Content("~/add")" class="navbar-form">
            <h2>Add a new customer to in memory list</h2>
            <small>Please note that customer will be added to list, but as it doesn't save anywhere it won't be remembered between calls<br/></small>
            <div class="form-group">
            <input type="text" name="Id" class="form-control" placeholder="Enter Id..." /><br/>
            </div>
            <div class="form-group">
            <input type="text" name="Name" class="form-control" placeholder="Enter Name..." /><br/>
            </div>
            <input type="submit" class="btn btn-primary" value="Add"/><br/>
        </form>
    </div>
  </body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using Nancy;
using Nancy.ModelBinding;
using Nancy.Extensions;
using Nancy.Validation;

namespace Nancy.Demo
{
	public class CustomerModule : NancyModule
	{
		public CustomerModule()
		{
			// index is an entry point
			Get["/index"] = parameters =>
			{
				var customers = GetCustomers();
				return View[customers];
			};
			Post["/add"] = parameters =>
			{
				var customer = this.Bind<Customer>();
				// lets validate it
				var result = this.Validate<Customer>(customer);
				if (!result.IsValid)
				{
					return RenderErrorView(result);
				}

				var customers = GetCustomers();
				customers.Add(customer);
				return View[customers];
			};
		}

		private string RenderErrorView(ModelValidationResult result)
		{
			var url = string.Format("<a href='{0}'>Back to List</a>", this.Context.ToFullPath("~/index"));
			var errorsDescription = result.Errors.SelectMany(e => e.Value.Select(error => error.ErrorMessage)).ToList();
			return "Sorry, but your data is invalid. " + url + "<br/>Errors: <br/>" + string.Join(", <br/>", errorsDescription);
		}

		private List<Customer> GetCustomers()
		{
			return new List<Customer>()
			{
				new Customer()
				{
					Id = 1,
					Name = "John"
				},
				new Customer()
				{
					Id = 2,
					Name = "Bob"
				},
				new Customer()
				{
					Id = 42,
					Name = "Alice"
				},
			};
		}
	}
}

Module

 
using System;
using System.Collections.Generic;
using System.Linq;
using Nancy;
using Nancy.ModelBinding;
using Nancy.Extensions;
using Nancy.Validation;
​
namespace Nancy.Demo
{
    public class CustomerModule : NancyModule
    {
        public CustomerModule()
        {
            // index is an entry point
            Get["/index"] = parameters =>
            {
                var customers = GetCustomers();
                return View[customers];
            };
            Post["/add"] = parameters =>
            {
                var customer = this.Bind<Customer>();
                // lets validate it
                var result = this.Validate<Customer>(customer);
                if (!result.IsValid)
                {
                    return RenderErrorView(result);
                }
​
                var customers = GetCustomers();
                customers.Add(customer);
                return View[customers];
            };
        }
​
        private string RenderErrorView(ModelValidationResult result)
        {
            var url = string.Format("<a href='{0}'>Back to List</a>", this.Context.ToFullPath("~/index"));
            var errorsDescription = result.Errors.SelectMany(e => e.Value.Select(error => error.ErrorMessage)).ToList();
            return "Sorry, but your data is invalid. " + url + "<br/>Errors: <br/>" + string.Join(", <br/>", errorsDescription);
        }
​
        private List<Customer> GetCustomers()
        {
            return new List<Customer>()
            {
                new Customer()
                {
                    Id = 1,
                    Name = "John"
                },
                new Customer()
                {
                    Id = 2,
                    Name = "Bob"
                },
                new Customer()
                {
                    Id = 42,
                    Name = "Alice"
                },
            };
        }
    }
}

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