C# - Sorting using Extension Method

Question

I want to sort a list of person say

List persons=new List();
persons.Add(new Person(\"Jon\",\"Bernald\",45000.89));
persons.Add(new P         


        

Answer 1

To get this to work in a lambda, the expression needs to form a Comparison signature. This would take 2 "Person" instances. You could do this like:

public static void SortPeople(
    this List lst, CompareOptions opt1,SortOrder ord)
{
    lst.Sort((left, right) => 
             {
                 int result;
                 // left and right are the two Person instances
                 if (opt1 == CompareOptions.Salary)
                 {
                     result = left.Salary.CompareTo(right.Salary);
                 }
                 else
                 {
                     string compStr1, compStr2;
                     if (opt1 == CompareOptions.FirstName)
                     {
                          compStr1 = left.FirstName;
                          compStr2 = right.FirstName;
                     }
                     else
                     {
                          compStr1 = left.LastName;
                          compStr2 = right.LastName;
                     }
                     result = compStr1.CompareTo(compStr2);
                 }
                 if (ord == SortOrder.Descending)
                     result *= -1;
                 return result;
             });
}