Asp.net/MVC cannot implicitly convert type error

Question

0.00/5 (No votes)

See more:

Hello, I am new to entity framework/mvc/asp and am running into an error I'm not sure how to resolve.

The error I am getting is Error CS0029 Cannot implicitly convert type 'System.Collections.Generic.List<system.web.mvc.selectlistitem>' to 'FirmAdmin.Business.RegistrationType'

Here is the code throwing the error I am getting on

return oRegResults;

C#

public Business.RegistrationType GetReg()
        {
            //**********
            //Initialize
            //**********
            const string cMyMethodName = "GetFirm";
            string cContext = "Initializing";
            System.Linq.IQueryable<Data.Registration_Type> oFirmListEF;
            //System.Collections.Generic.List<Business.RegistrationType> oRegResults = new System.Collections.Generic.List<Business.RegistrationType>();
            List<SelectListItem> oRegResults = new List<SelectListItem>();

            try
            {
              

                using (var oFirmContext = new FirmContext(oDB, true))
                {

                   
                    List<SelectListItem> oRegList = new List<SelectListItem>();
                    var registrationList = (oFirmListEF = oFirmContext.Registration_Type.AsQueryable()
                    .OrderBy(f => f.Registration)).ToList();



                    //***************************
                    //Prepare a View Model object
                    //***************************
                    cContext = "Loading data from EF into view model";
                                      System.Collections.Generic.List<Business.RegistrationType> oReg = new System.Collections.Generic.List<Business.RegistrationType>();

                    foreach (var item in registrationList)
                    {
                       oRegList.Add(new SelectListItem { Value = item.Registration.ToString() });
                        
                    };


                     oRegResults = oRegList;

                   
                }

            }
            catch (Exception ex)
            {
                //****************
                //Report the error
                //****************
                throw new System.Exception("Error occured in " + this.MyClassName + "." + cMyMethodName + " Error: " + ex.Message.ToString() + " Context: " + cContext);
               
            }

            return oRegResults;
        }

Here is the code in RegistrationType

C#

<pre>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel;

namespace Fed.FirmAdmin.Business
{
    /// <summary>
    /// This class represents a Firm
    /// </summary>
    public class RegistrationType : BaseEntity
    {
        private const string MyClassName = "RegistrationType";

        [DisplayName("ID:")]  
        [Required]
        [Key]
        public int RegId { get; set; }


        [DisplayName("Registration:")]
        //[Required]
        public string Registration { get; set; }



}

What I have tried:

I am not sure what i am missing in RegistrationType is seems like I need to declare a list item there?

Posted 24-Mar-21 10:50am

Member 15053439

Updated 24-Mar-21 12:55pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2021-03-24T12:55:00

You have declared the GetReg method as Business.RegistrationType - which means it returns a single instance of the class Business.RegistrationType.

To simplify it, you would get the same error with this code:

C#

private int Fail()
   {
   return "Hello world";
   }

Because Failis declared as returning a integer, and you are returning a string. You can't implicitly cast a string to an integer - because it might be the text "Hello world" and that doesn't have a numeric equivalent - so the sytem tells you you have made a mistake somewhere.

Your GetReg method returns a List<SelectListItem> which is a collection of SelectListItem objects, and even the individual instances have no obvious relation to the return type!

We can't fix that for you: I have no idea what the heck you expect that to return, and much less idea where it might get that information from!