How to build nested treeview in C#?

Question

I am using dapper, asp.net web api and want to show data in treeview. For this, I have 2 models that currently looks like below. Database table mapping:

public c         


        

Answer 1

Create a method in Zones model

public void PrintPretty(string indent, bool last)
    {
        Console.Write(indent);
        if (last)
        {
            Console.Write("|-");
            indent += "  ";
        }
        else
        {
            Console.Write("|-");
            indent += "| ";
        }
        Console.WriteLine(Name);

        for (int i = 0; i < Children.Count; i++)
            Children[i].PrintPretty(indent, i == Children.Count - 1);
    }

then rename the zones model class to childzone

public class childzones
{
    public string model_zone_id { get; set; }
    public string model_zone_name { get; set; }
    public string model_zone_parent_id { get; set; }
}

because class names should not be equal for generating treeNode.

You can use the same Zones class like this

 public class Zones
    {

        public Zones()
        {
            Children = new List();
        }
        public string Id { get; set; }
        public string Name { get; set; }
        public List Children { get; set; }

        public void PrintPretty(string indent, bool last)
        {
            Console.Write(indent);
            if (last)
            {
                Console.Write("|-");
                indent += "  ";
            }
            else
            {
                Console.Write("|-");
                indent += "| ";
            }
            Console.WriteLine(Name);

            for (int i = 0; i < Children.Count; i++)
                Children[i].PrintPretty(indent, i == Children.Count - 1);
        }

    }

Finally you will get a Model like this

static void Main(string[] args)
        {

            Zones node1 = new Zones()
            {
                Name = "Root",
                Id = "1",
                Children = {
                    new Zones() {
                        Name = "BranchA",
                       Id = "1",
                        Children = {
                            new Zones() {
                                Name = "Siblings1",
                                 Id = "1",
                                Children = {
                                    new Zones() {
                                        Name = "subChild1",
                                         Id = "1",
                                        Children = {
                                        }
                                    },
                                    new Zones() {
                                        Name = "subchild2",
                                         Id = "1",
                                        Children= {
                                        }
                                    }
                                }

                            },
                            new Zones() {
                                Name = "Siblings2",
                                 Id = "1",
                                Children = {

                                }
                            }
                        }
                    },
                    new Zones() {
                        Name = "BranchB",
                         Id = "1",
                        Children = {
                            new Zones() {
                                Name = "Sibilings1",
                                 Id = "1",
                                Children = {

                                }
                            }
                        }
                    }
                }
            };
            node1.PrintPretty("", true);

}

Output

|-Root
  |-BranchA
  | |-Siblings1
  | | |-subChild1
  | | |-subchild2
  | |-Siblings2
  |-BranchB
    |-Sibilings1