Clever Geek Handbook

Creating a custom list using a lambda expression

I need to create a list of custom type with properties like int, int

public class CustomClass
{
   public int EmployeeID{get;set;}
   public int ClientID{get;set;}
}

The two parameters I need to create are List and int

My method

CreateCustomClassList(List<int> EmployeeIDList, int clientID}
{
List<CustomClass> lst=new List<CustomClass>();
EmployeeIDList.ForEach
  (u=>lst.Add(new CustomClass
  {
     ClientID=clientID, 
     EmployeeID=u
  });
}

I don't want to run Loop for this, is there any more efficient way to do this.

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1 answer


I would use ToList

here:

List<CustomClass> lst = EmployeeIDList
     .Select(employeeID => new CustomClass
     {
         ClientID = clientID, 
         EmployeeID = employeeID
     })
     .ToList();

It will probably be ineffective, but it will be clearer - which, in my opinion, is more important.



If you really want efficiency, then the best bet is probably the solution you've already rejected - a simple loop:

List<CustomClass> lst = new List<CustomClass>(EmployeeIDList.Count);
foreach (int employeeID in EmployeeIDList) {
    lst.Add(new CustomClass
        {
            ClientID = clientID, 
            EmployeeID = employeeID
        });
}
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