C# 數組、多維數組（矩形數組）、鋸齒數組（交叉數組）

數組是變量的索引列表，可以在方括號中指定索引來訪問數組中的各個成員，其中索引是一個整數，從0開始。

一維數組

多維數組（矩形數組）

數組的數組（鋸齒數組）

數組必須在訪問之前初始化，數組的初始化有兩種方式，可以以字面的形式指定數組的內容，也可以使用new關鍵詞顯式的初始化數組;

 int[] arr = { 1, 2, 3 }; int[] arr1 = new int[3];

數組類型是從抽象基類型 Array 派生的引用類型。由于此類型實現了 IEnumerable ，因此可以對 C# 中的所有數組使用 foreach 迭代,foreach循環對數組內容進行只讀訪問，所以不能改變任何元素的值。

     int[] arr = { 1, 2, 3 };            foreach (var item in arr)            {                Console.WriteLine(item);            }            Array arr2 = Array.CreateInstance(typeof(int), 3);            arr2.SetValue(1, 0);            arr2.SetValue(2, 1);            arr2.SetValue(3, 2);            foreach (var item1 in arr2)            {                Console.WriteLine(item1);            }

多維數組是使用多個索引訪問其元素的數組，下面以二維數組為例：

   int[,] arr = { { 1, 2 }, { 4, 5 }, { 7, 8 } };            int[,] arr1 = new int[3, 2];            arr1[0, 0] = 1;            arr1[0, 1] = 2;            foreach (var item in arr)            {                Console.WriteLine(item);            }

方括號中的第一個數字指定花括號對，第二個數字花括號中的元素

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