轻松学习C#的foreach迭代语句

int[,] ints =new int[2,3]{{1,2,3},{4,5,6}}; 
      foreach (int temp in ints) 
      { 
        Console.WriteLine(temp);  
      } 
      Console.ReadLine();

int[,] ints =new int[2,3]{{1,2,3},{4,5,6}}; 
 for (int i = 0; i < ints.GetLength(0); i++) 
 { 
   for (int j = 0; j < ints.GetLength(1); j++) 
   { 
     Console.WriteLine(ints[i,j]); 
   } 
 } 
 Console.ReadLine();

int[] a=new int[3]{1,2,3}; 
      ArrayList arrint = new ArrayList(); 
      arrint.AddRange(a); 
      foreach (int temp in arrint) 
      { 
        Console.WriteLine(temp); 
      } 
      Console.ReadLine();

int[] a=new int[3]{1,2,3}; 
      ArrayList arrint = new ArrayList(); 
      arrint.AddRange(a); 
      for (int i = 0; i < arrint.Count;i++ ) 
      { 
        int n = (int)arrint[i]; 
        Console.WriteLine(n); 
      } 
      Console.ReadLine();

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace @foreach 
{ 
  class Program 
  { 
    static void Main(string[] args) 
    { 
      string str = "This is an example of a foreach"; 
      foreach (char i in str) 
      { 
        if (char.IsWhiteSpace(i)) 
        { 
          Console.WriteLine(i);//当i为空格时输出并换行 
        } 
        else 
        { 
          Console.Write(i);//当i不为空格时只是输出 
        } 
      } 
      Console.ReadLine(); 
    } 
  } 
}