This code snippet explains how to apply a user defined custom sort on a SortedList. The objects of the class to be sorted implements the IComparable interface and overrides the CompareTo()method. The code also takes the help of a customized comparer class which implements the IComparer interface.
Here is a BankAccount class on which we want to apply the custom sort. Different BankAccount objects will be stored on a SortedList with the BankAccount as the key and Account holder name as the value.
public class BankAccount : IComparable
{
long accountId;
double balance;
public BankAccount(long accountId, double balance)
{
this.accountId = accountId;
this.balance = balance;
}
public long AccountId
{
get { return accountId; }
}
public double Balance
{
get { return balance; }
}
//Implement the ComparTo method; so that comparision is made using the bank balance field
public int CompareTo(BankAccount other)
{
return Convert.ToInt32(balance - other.balance);
}
public override string ToString()
{
return "accountId=" + accountId + ", balance=" + balance;
}
}
Here is a BalanceComparer class which sorts the BankAccounts object in a descending order based on the balance:
public class BalanceComparer : IComparer
{
public int Compare(BankAccount x, BankAccount y)
{
return y.CompareTo(x);
}
}
Here is a test code to test the sort
SortedList accountList = new SortedList();
BankAccount account1 = new BankAccount(1001, 1500.00);
BankAccount account2 = new BankAccount(1002, 1250.00);
BankAccount account3 = new BankAccount(1003, 1750.00);
accountList = new SortedList(new BalanceComparer());
accountList.Add(account1, "Dick");
accountList.Add(account2, "Eric");
accountList.Add(account3, "Bob");
for (int i = 0; i < accountList.Count; i++)
Console.WriteLine("accountList[{0}]={1}", accountList.Keys[i], accountList.Values[i]);
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