How to check if an item has already been entered in a list in c#

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  1. There is the list classes
  2. Inside that list I put objects like gang
  3. Each object has (string)nameTurma.Text & a numerical value (int)numericUpDown1.Value

  4. I use the method addTurma to place objects in the list classes

        public static List<turma> turmas = new List<turma>();

    public static void addTurma(turma x)
    {

        turmas.Add(x);

    }
 turma x = new turma(nomeTurma.Text,(int)numericUpDown1.Value);
 //Se nomeTurma.Text não exite na lista turmas
  {
  turma.addTurma(x);
  }

I just want to add class objects which do not have the same name, that is, check whether (string)nameTurma.Text already exists on the list classes

c#
  • 1

    Make a go on the list and see if it exists by comparing the two, see if there is an equal and controls with a bool

  • @Brunoh. There is no other way, there is no kind of a method that already does this own of the lists ?

  • 2

    Yeah, use the . Any().

  • @Francis as I use the . Any ?

  • @Amadeuantunes Linq for me is equal to regex, I know how it works, but I have no idea how you use kkkkkk Anyway, you can see in the documentation and maybe find the expression you need to do this check: https://msdn.microsoft.com/pt-br/library/bb534972(v=vs.110). aspx

  • 2

    It’s gonna be something like this: bool existeNome = turmas.Any(p => p.Nome == nomeTurma.Text);

  • 1

    You can also make a If if no you add, type:if(!turmas.Any(p => p.Nome == nomeTurma.Text){...})

  • https://stackoverflow.com/questions/45400646/how-to-check-if-item-already-is-in-list-c-sharp/45400737#45400737 helped me so

  • The question is already open ^^

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if(turmas.Any(t => t.Text == text))  
{

}

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