MVC4 – Page 2 – What I Broke – Programming and Web Development

Unable to Find GoogleOAuth2AuthenticationOptions – MVC4/5

Hey everyone,

I was following the guide provided via the startup.auth.cs link on how to add Google authentication to your app. The problem I hit was that the example types used weren’t available, specifically GoogleOAuth2AuthenticationOptions.

Thankfully the fix fix for this was pretty easy, simply update OWIN via NuGet:

– Right click on your project
– Go to Manage NuGet Packages
– Click on the updates drop down
– Search for OWIN
– Update all of the relevant options

Thanks to this Stackoverflow post for the solution: http://stackoverflow.com/a/23606431/522859

Decimal Values for Bitcoin C#

Hey everyone,

Just linking to a few Stackoverflow posts that have helped me out with bitcoin precision requirements:

Precision Values
http://stackoverflow.com/a/22077085/522859
http://bitcoin.stackexchange.com/a/4099

Setting up Decimal Precision in MVC4+
http://stackoverflow.com/a/7769162/522859

Request for ConfigurationPermission failed while attempting to access configuration section ‘paypal’ – PayPal & GoDaddy

Hey everyone,

I ran into the following error today while working with PayPal on a GoDaddy hosted server:

Request for ConfigurationPermission failed while attempting to access configuration section ‘paypal’. To allow all callers to access the data for this section, set section attribute ‘requirePermission’ equal ‘false’ in the configuration file where this section is declared.

To fix it, all you need to do is add the requirePermission attribute to the section declaration. Note that this is not where it says paypal but under the configsections heading.

Rendering a View to a String – Email Templates in MVC4

Hey everyone,

This is just a short post showing how to render views as strings. I’ve used this as a quick way to generate email templates. The logic to render a view as a string is as follows:

public static string RenderRazorViewToString(Controller controller, string viewName, string content)
        {
            controller.ViewBag.Content = content;

            using (var sw = new StringWriter())
            {
                var viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext, viewName);
                var viewContext = new ViewContext(controller.ControllerContext, viewResult.View, controller.ViewData, controller.TempData, sw);
                viewResult.View.Render(viewContext, sw);
                viewResult.ViewEngine.ReleaseView(controller.ControllerContext, viewResult.View);

                return sw.GetStringBuilder().ToString();
            }
        }

The Email Template: Views/Emails/DefaultTemplate

@{
    Layout = null;
}



    

    Easy Carts





    
    
        
            
                
                    
                                                   
                            @ViewBag.Content

In your controller:

public String TestEmail(String content)
        {
            Email email = new Email() {
                To = "lls@live.com.au",
                From = Email.Fields.From.NoReply,
                Body = content,
                Subject = "Test",
                TemplateName = @"~ViewsEmailsDefaultTemplate.cshtml",
                UseTemplate = true
            };
      
            email.SendEmail(this);
            
            db.Emails.Add(email);
            db.SaveChanges();

            return email.Body.ToString();
        }

If you looking to implement this with your emails, note that it builds on top of the email class we created back in this post: http://www.whatibroke.com/?p=963

If you’re just going to be using it directly within the controller, using the original code from over StackOverflow will probably be your best bet: http://stackoverflow.com/a/2759898/522859

Redirect to Root – C# MVC4

Hey everyone,

Just a quick one, how to redirect to root from a controller:

return Redirect(Url.Content("~/"));

For more info, checkout this Stackoverflow post: http://stackoverflow.com/a/10292039/522859

Rails Flash Messages in MVC4

Hey everyone,

Coming from Rails I’d grown quite fond of flash messages. Unfortunately there isn’t a built in way of doing this in MVC4. Luckily, there’s a five minute solution posted on StackOverflow: http://stackoverflow.com/a/11809178/522859

Once implemented, it works just like in Rails:

this.Flash("We need you to login before you can edit anything.", FlashEnum.Warning);

Definitely worth checking out if you’ve got time, even more so if you’ve come over from Rails!

Sending Emails – MVC4 on GoDaddy

Hey everyone,

Just a really basic model that can be used to send emails on GoDaddy in MVC4.

The model:

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Web;
using System.Net.Mail;
using System.ComponentModel.DataAnnotations;

namespace LL.Models
{
    public class Email
    {
        [Key]
        public int EmailId { get; set; }

        public string From { get; set; }
        public string To { get; set; }
        public string Subject { get; set; }
        public string Body { get; set; }
        public DateTime Sent { get; set; }
        public string Status { get; set; }
        public string Log { get; set; }
        
        
        public void SendEmail()
        {
            MailMessage mail = new MailMessage();
            mail.To.Add(this.To);
            mail.From = new MailAddress(this.From);
            mail.Subject = this.Subject;
            mail.Body = Body;
            mail.IsBodyHtml = true;
            mail.Priority = MailPriority.Normal;
            
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "relay-hosting.secureserver.net";
            smtp.UseDefaultCredentials = true;
            smtp.Port = 25;
            smtp.EnableSsl = false;  

            try
            {
                smtp.Send(mail);
                this.Status = Fields.Status.Success;
            }
            catch(Exception e)
            {
                this.Log = e.Message;
            }

            this.Sent = DateTime.Now;
        }

        [NotMapped]
        public class Fields
        {
            public class From
            {
                public const String NoReply = "noreply@yoursite.com.au";
                public const String Support = "support@yoursite.com.au";
            }

            public class Status
            {
                public const String Success = "Success";
                public const String Error = "Error";
            }
        }

    }
}

Using it in a controller:

using LearnerLessons.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace LL.Controllers
{
    public class TestController : Controller
    {
        private LLDBContext db = new LLDBContext();
        
        public String TestEmail(String content)
        {
            Email email = new Email() { To = "lls@live.com.au", From = Email.Fields.From.NoReply, Body = content, Subject = "Test" };
            email.SendEmail();

            db.Emails.Add(email);
            db.SaveChanges();

            return email.ToString();
        }
    }
}

Update:
For a quick tutorial on how to use Razor views as email templates, check out the following post: http://www.whatibroke.com/?p=983

The configuration section ‘customErrors’ cannot be read because it is missing a section declaration – Azure

Hey everyone,

The configuration section ‘customErrors’ cannot be read because it is missing a section declaration

I started receiving this error after I added the following elements to my Web.config file:

The problem turned out to be that the custom errors entry actually belongs under system.web. All you actually need to add it the <customErrors mode=”Off”/> part – just make sure it’s under system.web.

Failed to register URL “http://10.X.X.X:11111″ for site “XXX” application “/”

Hey everyone,

I’ve just upgraded to Visual Studio 2013 and ran into the following while trying to run IIS express:

Failed to register URL “http://10.1.1.2:53034” for site “XXX” application “/”. Error description: Access is denied. (8×80070005).

The solution ended up being pretty obvious, I didn’t have permission. Run it with administrative privileges and the error goes away.

A project with an output type of class library cannot be started directly – MVC Project with Class Library

Hey everyone,

Just another quick post for fixing the following error in a multi-project solution:

A project with an output type of class library cannot be started directly

Simply right click on the project that you want to start and select “Set as StartUp Project”.

Source: http://stackoverflow.com/a/10004706/522859