Get Distinct departments : Distinct « LINQ « C# / CSharp Tutorial

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C# / CSharp Tutorial » LINQ » Distinct 
22.31.6.Get Distinct departments
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class Tree<TreeNode> : IEnumerable<TreeNode> where TreeNode : IComparable<TreeNode> {
    public Tree(TreeNode nodeValue) {
        this.NodeData = nodeValue;
        this.LeftTree = null;
        this.RightTree = null;
    }

    public void Insert(TreeNode newItem) {
        TreeNode currentNodeValue = this.NodeData;
        if (currentNodeValue.CompareTo(newItem0) {
            if (this.LeftTree == null) {
                this.LeftTree = new Tree<TreeNode>(newItem);
            else {
                this.LeftTree.Insert(newItem);
            }
        else {
            if (this.RightTree == null) {
                this.RightTree = new Tree<TreeNode>(newItem);
            else {
                this.RightTree.Insert(newItem);
            }
        }
    }

    public void WalkTree() {
        if (this.LeftTree != null) {
            this.LeftTree.WalkTree();
        }

        Console.WriteLine(this.NodeData.ToString());

        if (this.RightTree != null) {
            this.RightTree.WalkTree();
        }
    }

    public TreeNode NodeData get; set; }
    public Tree<TreeNode> LeftTree get; set; }
    public Tree<TreeNode> RightTree get; set; }


    IEnumerator<TreeNode> IEnumerable<TreeNode>.GetEnumerator() {
        if (this.LeftTree != null) {
            foreach (TreeNode item in this.LeftTree) {
                yield return item;
            }
        }

        yield return this.NodeData;

        if (this.RightTree != null) {
            foreach (TreeNode item in this.RightTree) {
                yield return item;
            }
        }
    }
    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
        throw new NotImplementedException();
    }
}

class Employee : IComparable<Employee> {
    public string FirstName get; set; }
    public string LastName get; set; }
    public string Department get; set; }
    public int Id get; set; }

    public override string ToString() {
        return String.Format("Id: {0}, Name: {1} {2}, Dept: {3}"this.Id, this.FirstName, this.LastName, this.Department);
    }
    int IComparable<Employee>.CompareTo(Employee other) {
        if (other == null)
            return 1;

        if (this.Id > other.Id)
            return 1;

        if (this.Id < other.Id)
            return -1;

        return 0;
    }
}

class Program {
    static void Main() {
        Tree<Employee> empTree = new Tree<Employee>(new Employee Id = 1, FirstName = "Janet", LastName = "Gates", Department = "IT" });
        empTree.Insert(new Employee Id = 2, FirstName = "O", LastName = "G", Department = "Marketing" });
        empTree.Insert(new Employee Id = 4, FirstName = "K", LastName = "H", Department = "IT" });
        empTree.Insert(new Employee Id = 6, FirstName = "L", LastName = "H", Department = "Sales" });
        empTree.Insert(new Employee Id = 3, FirstName = "E", LastName = "L", Department = "Sales" });
        empTree.Insert(new Employee Id = 5, FirstName = "D", LastName = "L", Department = "Marketing" });

        var depts = (from d in empTree select d.Department).Distinct();

        foreach (var dept in depts)
            Console.WriteLine("Department: {0}", dept);
    }
}
22.31.Distinct
22.31.1.Create the Distinct query
22.31.2.Use Linq Distinct to get the distinct value in an array
22.31.3.Set Operators: Distinct
22.31.4.Printing the unique Category names
22.31.5.Distinct Operator
22.31.6.Get Distinct departments
22.31.7.Get all Make and don't show duplicates
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