CODEWITHSUNDEEP
c#asp.net-mvclinq
kez
kez

Reputation: 2313

Filtered List items add to collection in ASP.NET MVC

I have following code snippet to fetch data as IEnumarable list and filter them using LINQ and insert those details to List/

  IEnumerable<User> listUsers = ..// From DB 
  List<User> filteredUsers = new List<User>();

  if (listUsers != null)
  {                          
     foreach(var user in listUsers)
     {
        filteredUsers = listUsers.Where(x => x.GroupID == item).ToList();                            
     }                    
  }

How to insert these Each filteredUsers item to collection , I tried something like below but this is with compile time errors, how to do this properly 

      IEnumerable<User> listUsers = ..// From DB 
      List<User> filteredUsers = new List<User>();
      IEnumerable<User> salistUsers = new List<User>();

      if (listUsers != null)
      {                          
         foreach(var user in listUsers)
         {
            filteredUsers = listUsers.Where(x => x.GroupID == item).ToList();   
            salistUsers.Add(filteredUsers);                         
         }                    
      }

Upvotes: 0

Views: 170

Answers (2)

Yanga
Yanga

Reputation: 3002

You can't use .Add with an IEnumerable, salistUsers sould be a List:

List<User> salistUsers = new List<User>();

The Add method is used to add a single object.

Try AddRange instead, which allows you to add a list:

if (listUsers != null && !listUser.Any())
{                          
     var filteredUsers = listUsers.Where(x => x.GroupID == item).ToList();
     salistUsers.AddRange(filteredUsers);                                            
}

Upvotes: 0

Mohsen Esmailpour
Mohsen Esmailpour

Reputation: 11544

Change salistUsers type from IEnumerable<User> to List<Users> and use List.AddRange(collection As IEnumerable(Of T)) method.

IEnumerable<User> listUsers = ..// From DB 
List<User> salistUsers = new List<User>();

if (listUsers != null && !listUser.Any())
{                          
     var filteredUsers = listUsers.Where(x => x.GroupID == item).ToList();
     salistUsers.Add(filteredUsers);                                            
}

Upvotes: 1

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