下面是C#动态修改数组维数的代码：

using System;
using System.Text;
namespace ConsoleApplication2
{
class Class1
{
[STAThread]
static void Main(string[] args)
{
int[] arr=new int[]{1,2,3};
foreach(int x in arr)
Console.Write(x+" ");
Console.WriteLine();
arr=(int[])Redim(arr,5);
foreach(int x in arr)
Console.Write(x+" ");
Console.WriteLine();
arr=(int[])Redim(arr,2);
foreach(int x in arr)
Console.Write(x+" ");
Console.WriteLine();
}
public static Array Redim(Array origArray,int desiredSize)
{
Type t=origArray.GetType().GetElementType();
Array newArray=Array.CreateInstance(t,desiredSize);
Array.Copy(origArray,0,newArray,0,Math.Min(origArray.Length,desiredSize));
return newArray;
}
}
}