C# Sharp Exercises: Generate a Right Join between two data sets

C# Sharp LINQ : Exercise-27 with Solution

Write a program in C# Sharp to generate a Right Outer Join between two data sets.

Sample Solution:-

C# Sharp Code:

//LINQ does not supports right outer join, only supports left outer joins. 
//You can get the behavior of a right outer join if you swap the tables and do a left outer join.

using System;
using System.Linq;
using System.Collections.Generic;
 
class  LinqExercise27
{
    static void Main(string[] args)
    {
        
        List<Item_mast> itemlist = new List<Item_mast>
	        {  
           new Item_mast { ItemId = 1, ItemDes = "Biscuit  " }, 
           new Item_mast { ItemId = 2, ItemDes = "Chocolate" }, 
           new Item_mast { ItemId = 3, ItemDes = "Butter   " },  
           new Item_mast { ItemId = 4, ItemDes = "Brade    " },  
           new Item_mast { ItemId = 5, ItemDes = "Honey    " }  
            }; 
		  
        List<Purchase> purchlist = new List<Purchase>
	        {  
           new Purchase { InvNo=100, ItemId = 3,  PurQty = 800 }, 
           new Purchase { InvNo=101, ItemId = 5,  PurQty = 650 }, 
           new Purchase { InvNo=102, ItemId = 3,  PurQty = 900 },  
           new Purchase { InvNo=103, ItemId = 4,  PurQty = 700 },
		   new Purchase { InvNo=104, ItemId = 3,  PurQty = 900 },  
           new Purchase { InvNo=105, ItemId = 4,  PurQty = 650 },  		   
           new Purchase { InvNo=106, ItemId = 1,  PurQty = 458 }  
            }; 
	
            Console.Write("\nLINQ : Generate a Right Join between two data sets : "); 
            Console.Write("\n--------------------------------------------------\n");
			Console.Write("Here is the Item_mast List : ");
			Console.Write("\n-------------------------\n");
			
			 foreach (var item in itemlist)
				{
				Console.WriteLine(
				"Item Id: {0}, Description: {1}",
				item.ItemId,
				item.ItemDes);
				}

			Console.Write("\nHere is the Purchase List : ");
			Console.Write("\n--------------------------\n");
			
			 foreach (var item in purchlist)
				{
				Console.WriteLine(
				"Invoice No: {0}, Item Id : {1},  Quantity : {2}",
				item.InvNo,
				item.ItemId,
				item.PurQty);
				}

            Console.Write("\nHere is the list after joining  : \n\n");


 var rightOuterJoin = from p in purchlist
            		join i in itemlist
            		on p.ItemId equals i.ItemId
            		into a
            			from b in a.DefaultIfEmpty()
            			select new
            			{
                		itid=b.ItemId,
               			itdes = b.ItemDes,
                		prqty=p.PurQty
            			};

		    Console.WriteLine("Item ID\t\tItem Name\tPurchase Quantity");
			Console.WriteLine("-------------------------------------------------------");
			foreach (var data in rightOuterJoin )  
			{  
				Console.WriteLine(data.itid + "\t\t" + data.itdes + "\t\t" + data.prqty);  
			}           
             Console.ReadLine();
    }
}
public class Item_mast
{
    public int ItemId { get; set; }
    public string ItemDes { get; set; }
}

public class Purchase
{
    public int InvNo { get; set; }
    public int ItemId { get; set; }
    public int PurQty { get; set; }
}

Sample Output:

LINQ : Generate a Right Join between two data sets :                                                          
--------------------------------------------------                                                            
Here is the Item_mast List :                                                                                  
-------------------------                                                                                     
Item Id: 1, Description: Biscuit                                                                              
Item Id: 2, Description: Chocolate                                                                            
Item Id: 3, Description: Butter                                                                               
Item Id: 4, Description: Brade                                                                                
Item Id: 5, Description: Honey                                                                                
   
Here is the Purchase List :                                                                                   
--------------------------                                                                                    
Invoice No: 100, Item Id : 3,  Quantity : 800                                                                 
Invoice No: 101, Item Id : 5,  Quantity : 650                                                                 
Invoice No: 102, Item Id : 3,  Quantity : 900                                                                 
Invoice No: 103, Item Id : 4,  Quantity : 700                                                                 
Invoice No: 104, Item Id : 3,  Quantity : 900                                                                 
Invoice No: 105, Item Id : 4,  Quantity : 650                                                                 
Invoice No: 106, Item Id : 1,  Quantity : 458
Here is the list after joining  :                                                                             
   
Item ID         Item Name       Purchase Quantity                                                             
-------------------------------------------------------                                                       
3               Butter                  800                                                                   
5               Honey                   650                                                                   
3               Butter                  900                                                                   
4               Brade                   700                                                                   
3               Butter                  900                                                                   
4               Brade                   650                                                                   
1               Biscuit                 458

Flowchart:

C# Sharp Code Editor:

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