Overload indexer - CSharp Custom Type

CSharp examples for Custom Type:Indexer

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Description

Overload indexer

Demo Code

using System;//w  ww.j a v a2 s  . c o  m
class BirthsList
{
   private int[] births;
   private string[] birthsRegionNames;
   public BirthsList(params string[] regionNames)
   {
      birthsRegionNames = regionNames;
      births = new int[regionNames.Length];
      for (int i = 0; i < regionNames.Length; i++)
      {
         births[i] = 0;
      }
   }
   public int this [int index]
   {
      get
      {
         if (index >= 0 && index < births.Length)
         {
            return births[index];
         }
         else
         {
            Console.WriteLine("Incorrect index provided");
            return -1;
         }
      }
      set
      {
         if (index >= 0 && index < births.Length)
         {
            births[index] = value;
         }
         else
         {
            Console.WriteLine("Incorrect index provided");
         }
      }
   }
   public int this [string indexName]
   {
      get
      {
         return this [NameToIndex(indexName)];
      }
      set
      {
         this[NameToIndex(indexName)] = value;
      }
   }
   private int NameToIndex(string indexName)
   {
      for (int i = 0; i < birthsRegionNames.Length; i++)
      {
         if (birthsRegionNames[i].ToUpper() == indexName.ToUpper())
            return i;
      }
      Console.WriteLine("Could not find region name");
      return -1;
   }
   public int TotalBirths
   {
         get
         {
            int sum = 0;
            foreach (int amount in births)
            {
               sum += amount;
            }
            return sum;
         }
   }
   public int Average
   {
         get
         {
            return TotalBirths / births.Length;
         }
   }
}
class BirthListTester
{
      public static void Main()
      {
         BirthsList birthsListUSA = new BirthsList("California", "New York", "Texas");
         birthsListUSA["California"] = 1;
         birthsListUSA[1] = 2;
         birthsListUSA[2] = 3;
         Console.WriteLine("Number of births in Texas: {0}", birthsListUSA["Texas"]);
         Console.WriteLine("Total births: {0}   Average births: {1}",
         birthsListUSA.TotalBirths, birthsListUSA.Average);
      }
}

Result


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