All about Arrays in C#—Accessing Array Elements

Microsoft .NET Framework, ASP.NET, Visual C# (CSharp, C Sharp, C-Sharp) Developer Training, Visual Studio

Accessing Array Elements

An array element is accessed using an integer value as an index into the array.

• Each dimension uses 0-based indexing.

• The index is placed between square brackets following the array name.

The following code shows examples of declaring, writing to, and reading from a one- dimensional and a two-dimensional array:

int[]  intArr1 = new int[15];    // 1-D example
   intArr1[2]     = 10;             // Write to element 2 of the array.
   int var1       = intArr1[2];     // Read from element 2 of the array.
 
   
   int[,] intArr2 = new int[5,10];  // 2-D example
   intArr2[2,3]   = 7;              // Write to the array.
   int var2       = intArr2[2,3];   // Read from the array. 

The following code shows the full process of creating and accessing a one-dimensional array:

int[] myIntArray;          // Declare the array.
 
   myIntArray = new int[4];   // Instantiate the array.
 
   for( int i=0; i<4; i++ )   // Set the values.
      myIntArray[i] = i*10;
 
   // Read and display the values of each element.
   for( int i=0; i<4; i++ )  
      Console.WriteLine("Value of element {0} = {1}", i, myIntArray[i]);

This code produces the following output:

Value of element 0 is 0
Value of element 1 is 10
Value of element 2 is 20
Value of element 3 is 30