Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.List'. An explicit conversion exists (are you missing a cast?)

Question

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I have the following class declaration:

C#

<blockquote class="FQ"><div class="FQA">Quote:</div> public class EventGroup
    {
        private readonly Guid id;
        private readonly string name;
        private readonly string description;
        private readonly Guid schoolId;     
       
        public EventGroup(Guid id, string name, string description, Guid schoolID) 
        {
            this.id = id;          
            this.schoolId = schoolID;
            this.name = name;
            this.description = description;
        }      
       public Guid SchoolID
        {
            get { return schoolId; }
        }
        public string Description
        {
            get { return description; }
        }
        public string Name
        {
            get { return name; }
        }
        public Guid ID
        {
            get { return id; }
        }       
       
    }

When I declare the following its working

C#

<blockquote class="FQ"><div class="FQA">Quote:</div>

List<EventGroup> lstGroup = new List<EventGroup>();
var eventt_grp= lstGroup.Select(r => new {r.ID,r.Name});

But its not working if I do like this and getting the error:
Quote:
Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<anonymoustype#1>' to 'System.Collections.Generic.List<tools.businessobjects.eventgroup>'. An
explicit conversion exists (are you missing a cast?)

C#

<blockquote class="FQ"><div class="FQA">Quote:</div>

List<EventGroup> eventt_grp1 = lstGroup.Select(r => new {r.ID, r.Name });

Posted 12-Dec-12 22:23pm

Tirthankar Dutta

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2 solutions

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

Christian Graus · Accepted Answer · 2012-12-12T22:31:00

Solution 1

Use var and don't create a list at all. You need to call ToList at the end of your Select in order to get back a list, instead of an IEnumerable.

List<eventgroup> eventt_grp1 = lstGroup.Select(r => new {r.ID, r.Name }).ToList();

If you don't want to use var, you need to define a class that has ID and Name properties. You need to use var because you're using an anonymous class.

Posted 12-Dec-12 22:31pm

Christian Graus

Updated 13-Dec-12 8:00am

v2

Comments

Rahul Rajat Singh 13-Dec-12 4:43am

IMHO, this will also not work because the result has to be in a the generic list that is expecting some type and the projected type is anonymous and thus we will never be able to specify the type of list of the result type variable.

Tirthankar Dutta 13-Dec-12 4:50am

May you kindly help how this can be written without using var?

Rahul Rajat Singh 13-Dec-12 5:01am

If you don't want to use var then you will have to utilize the fact that utlimately whatever is being returned is enumerable. so try this and this should work.

IEnumerable eventt_grp = lstGroup.Select(r => new {r.ID, r.Name });

Christian Graus 13-Dec-12 4:44am

I think you are right. So he needs to just use var.

Rahul Rajat Singh 13-Dec-12 5:01am

or he can try this:

IEnumerable eventt_grp = lstGroup.Select(r => new {r.ID, r.Name });

Balaji GJ 19-Feb-13 1:52am

xsxc

Member 12850869 28-Sep-17 5:54am

f

Luan Cardoso 9-Aug-19 7:36am

Thank you so much, it worked fine to me (.ToList();)
Love you <3

Rahul Rajat Singh · Accepted Answer · 2012-12-12T22:39:00

This is because you are returning an anonymous type from your Select and you are trying to store it in the List<eventgroup>. The projections always create anonymous types.

Also, if you only need to have ID and name in the results why are you storing them in a list of List<eventgroup>. using var should be fine. If you must have the result in the List<eventgroup> then there is something wrong and you might want to reconsider the logic/design.

If you don't want to use var then you will have to utilize the fact that utlimately whatever is being returned is enumerable. so try this and this should work.

C#

IEnumerable eventt_grp = lstGroup.Select(r => new {r.ID, r.Name });

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.List'. An explicit conversion exists (are you missing a cast?)

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Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.List'. An explicit conversion exists (are you missing a cast?)

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