Sum with object property : Sum « LINQ « C# / C Sharp

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C# / C Sharp » LINQ » SumScreenshots 
Sum with object property
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class Employee {
    public int id;
    public string firstName;
    public string lastName;

    public static ArrayList GetEmployeesArrayList() {
        ArrayList al = new ArrayList();
        al.Add(new Employee id = 1, firstName = "J", lastName = "R" });
        al.Add(new Employee id = 2, firstName = "W", lastName = "G" });
        al.Add(new Employee id = 3, firstName = "A", lastName = "H" });
        al.Add(new Employee id = 4, firstName = "D", lastName = "L" });
        al.Add(new Employee id = 101, firstName = "K", lastName = "F" });
        return (al);
    }

    public static Employee[] GetEmployeesArray() {
        return ((Employee[])GetEmployeesArrayList().ToArray(typeof(Employee)));
    }
}
public class EmployeeOptionEntry {
    public int id;
    public long optionsCount;
    public DateTime dateAwarded;

    public static EmployeeOptionEntry[] GetEmployeeOptionEntries() {
        EmployeeOptionEntry[] empOptions = new EmployeeOptionEntry[] {
        new EmployeeOptionEntry 
          id = 1
          optionsCount = 2
          dateAwarded = DateTime.Parse("1999/12/31") },
        new EmployeeOptionEntry 
          id = 101
          optionsCount = 2
          dateAwarded = DateTime.Parse("1998/12/31") }
      };
        return (empOptions);
    }
}
public class MainClass {
    public static void Main() {
        IEnumerable<EmployeeOptionEntry> options = EmployeeOptionEntry.GetEmployeeOptionEntries();
        long optionsSum = options.Sum(o => o.optionsCount);
        Console.WriteLine("The sum of the employee options is: {0}", optionsSum);
    }
}

 
Related examples in the same category
1.use Linq Sum to sum an array
2.use Sum to find the total of all of the numbers in an integer array.
3.Sum with Projection
4.Sum with integers
5.Grouped Sum
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