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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

How to: Consume a C# Indexer (C++/CLI)

Visual C++ does not contain indexers; it has indexed properties. To consume a C# indexer, access the indexer as if it were an indexed property.

For more information about indexers, see:

The following C# program defines an indexer.

// consume_cs_indexers.cs
// compile with: /target:library
using System;
public class IndexerClass {
   private int [] myArray = new int[100]; 
   public int this [int index] {   // Indexer declaration
      get {
         // Check the index limits.
         if (index < 0 || index >= 100)
            return 0;
         else
            return myArray[index];
      }
      set {
         if (!(index < 0 || index >= 100))
            myArray[index] = value;
      }
   }
}
/*
// code to consume the indexer
public class MainClass {
   public static void Main() {
      IndexerClass b = new IndexerClass();

      // Call indexer to initialize elements 3 and 5
      b[3] = 256;
      b[5] = 1024;
      for (int i = 0 ; i <= 10 ; i++) 
         Console.WriteLine("Element #{0} = {1}", i, b[i]);
   }
}
*/

This Visual C++ program consumes the indexer.

// consume_cs_indexers_2.cpp
// compile with: /clr
#using "consume_cs_indexers.dll"
using namespace System;

int main() {
   IndexerClass ^ ic = gcnew IndexerClass;
   ic->default[0] = 21;
   for (int i = 0 ; i <= 10 ; i++)
      Console::WriteLine("Element #{0} = {1}", i, ic->default[i]);
}
Element #0 = 21 Element #1 = 0 Element #2 = 0 Element #3 = 0 Element #4 = 0 Element #5 = 0 Element #6 = 0 Element #7 = 0 Element #8 = 0 Element #9 = 0 Element #10 = 0

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