I have a type of System.Type. It indicates an primitive type such as Int32. I
try to use the following code to create an array

Type arrayType = type.MakeArrayType(5);
object objArray = Activator.CreateInstance(arrayType);

but I got the following error:
{"No parameterless constructor defined for this object."}

Apparently, this is caused by the fact that the array type does not have a
default constructor.
How do I create the array using reflection?

Roy wrote:

I wrote the following app to examine the array's constructors:

using System;
using System.Reflection;

namespace NewArray
{
  class Program
  {
    static void Main(string[] args)
    {
      Type IntType = typeof(int);
      Type IntArrayType = IntType.MakeArrayType(5);
      ConstructorInfo[] Constructors = IntArrayType.GetConstructors();
      foreach (ConstructorInfo Constructor in Constructors)
      {
        ParameterInfo[] Parameters = Constructor.GetParameters();
        string[] Types = new string[Parameters.Length];
        for (int Index = 0; Index < Parameters.Length; Index++)
          Types[Index] = Parameters[Index].ParameterType.Name;
        Console.WriteLine("({0})", String.Join(", ", Types));
      }
      Console.ReadLine();
    }
  }
}

//

It gives the following output:

(Int32, Int32, Int32, Int32, Int32)
(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32)

//

That is, you can pass either five lengths (one for each dimension) or
five pairs of start/stop indices. Thus,

  int[, , , ,] A = (int[, , , ,])
    Activator.CreateInstance(IntArrayType, 3, 3, 3, 3, 3);

is exactly analagous to (but slower than)

  int[, , , ,] B = new int[3, 3, 3, 3, 3];

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