c# Rank属性与GetUpperBound方法的深入分析

using System;
 public class SamplesArray  {
    public static void Main()  {
       // Creates a new one-dimensional Array of type Int32.
       Array my1DIntArray = Array.CreateInstance( typeof(Int32), 5 );
       // Uses GetLowerBound and GetUpperBound in the for loop.
       for ( int i = my1DIntArray.GetLowerBound(0); i <= my1DIntArray.GetUpperBound(0); i++ )
          my1DIntArray.SetValue( i+1, i );
       // Displays the bounds and values of the one-dimensional Array.
       Console.WriteLine( "One-dimensional Array:" );
       Console.WriteLine( "Rank/tLower/tUpper" );
       Console.WriteLine( "{0}/t{1}/t{2}", 0, my1DIntArray.GetLowerBound(0), my1DIntArray.GetUpperBound(0) );
       Console.WriteLine( "Values:" );
       PrintValues( my1DIntArray );
       Console.WriteLine();
       // Creates a new three-dimensional Array of type Int32.
       Array my3DIntArray = Array.CreateInstance( typeof(Int32), 2, 3, 4 );
       // Uses GetLowerBound and GetUpperBound in the for loop.
       for ( int i = my3DIntArray.GetLowerBound(0); i <= my3DIntArray.GetUpperBound(0); i++ )
          for ( int j = my3DIntArray.GetLowerBound(1); j <= my3DIntArray.GetUpperBound(1); j++ )
             for ( int k = my3DIntArray.GetLowerBound(2); k <= my3DIntArray.GetUpperBound(2); k++ )  {
                my3DIntArray.SetValue( (i*100)+(j*10)+k, i, j, k );
             }
       // Displays the bounds and values of the multidimensional Array.
       Console.WriteLine( "Multidimensional Array:" );
       Console.WriteLine( "Rank/tLower/tUpper" );
       for ( int i = 0; i < my3DIntArray.Rank; i++ )
          Console.WriteLine( "{0}/t{1}/t{2}", i, my3DIntArray.GetLowerBound(i), my3DIntArray.GetUpperBound(i) );
       Console.WriteLine( "Values:" );
       PrintValues( my3DIntArray );
    }
    public static void PrintValues( Array myArr )  {
       System.Collections.IEnumerator myEnumerator = myArr.GetEnumerator();
       int i = 0;
       int cols = myArr.GetLength( myArr.Rank - 1 );
       while ( myEnumerator.MoveNext() )  {
          if ( i < cols )  {
             i++;
          } else  {
             Console.WriteLine();
             i = 1;
          }
          Console.Write( "/t{0}", myEnumerator.Current );
       }
       Console.WriteLine();
    }
 }
 /*
 This code produces the following output.
 One-dimensional Array:
 Rank    Lower    Upper
 0    0    4
 Values:
     1    2    3    4    5
 Multidimensional Array:
 Rank    Lower    Upper
 0    0    1
 1    0    2
 2    0    3
 Values:
     0    1    2    3
     10    11    12    13
     20    21    22    23
     100    101    102    103
     110    111    112    113
     120    121    122    123
*/