陣列 (C# 程式設計手冊)Arrays (C# Programming Guide)

您可以在陣列資料結構中儲存相同類型的多個變數。You can store multiple variables of the same type in an array data structure. 您可以指定陣列元素的類型來宣告陣列。You declare an array by specifying the type of its elements.

type[] arrayName;

下列範例會建立一維陣列、多維陣列和不規則陣列︰The following example creates single-dimensional, multidimensional, and jagged arrays:

class TestArraysClass
{
    static void Main()
    {
        // Declare a single-dimensional array. 
        int[] array1 = new int[5];

        // Declare and set array element values.
        int[] array2 = new int[] { 1, 3, 5, 7, 9 };

        // Alternative syntax.
        int[] array3 = { 1, 2, 3, 4, 5, 6 };

        // Declare a two dimensional array.
        int[,] multiDimensionalArray1 = new int[2, 3];

        // Declare and set array element values.
        int[,] multiDimensionalArray2 = { { 1, 2, 3 }, { 4, 5, 6 } };

        // Declare a jagged array.
        int[][] jaggedArray = new int[6][];

        // Set the values of the first array in the jagged array structure.
        jaggedArray[0] = new int[4] { 1, 2, 3, 4 };
    }
}

陣列概觀Array Overview

陣列具有下列屬性︰An array has the following properties:

  • 陣列可以是一維多維不規則An array can be Single-Dimensional, Multidimensional or Jagged.

  • 當陣列執行個體建立時,也會建立維度的數目和每個維度的長度。The number of dimensions and the length of each dimension are established when the array instance is created. 在執行個體的存留期期間,這些值無法變更。These values can't be changed during the lifetime of the instance.

  • 數值陣列元素的預設值設定為零,且參考元素會設定為 null。The default values of numeric array elements are set to zero, and reference elements are set to null.

  • 不規則陣列為陣列的陣列,因此其元素為參考類型,且會初始化為 nullA jagged array is an array of arrays, and therefore its elements are reference types and are initialized to null.

  • 陣列為以零為基底索引:具有 n 個元素的陣列,會從 0n-1 編製索引。Arrays are zero indexed: an array with n elements is indexed from 0 to n-1.

  • 陣列元素可以是任何類型,包含陣列類型。Array elements can be of any type, including an array type.

  • 陣列類型是衍生自抽象基底類型 Array參考類型Array types are reference types derived from the abstract base type Array. 由於這個類型會實作 IEnumerableIEnumerable<T>,您可以在所有以 C# 撰寫的陣列上使用 foreach 反覆項目。Since this type implements IEnumerable and IEnumerable<T>, you can use foreach iteration on all arrays in C#.

C# 語言規格C# Language Specification

如需詳細資訊,請參閱<C# 語言規格>。For more information, see the C# Language Specification. 語言規格是 C# 語法及用法的限定來源。The language specification is the definitive source for C# syntax and usage.

另請參閱See also