# Array.Length 属性

## 定义

``````public:
property int Length { int get(); };``````
``public int Length { get; }``
``member this.Length : int``
``Public ReadOnly Property Length As Integer``

#### 属性值

Int32

Array 的所有维度中的元素总数；如果数组中无元素，则为零。

## 示例

``````using System;

public class Example
{
public static void Main()
{
// Declare a single-dimensional string array
String[] array1d = { "zero", "one", "two", "three" };
ShowArrayInfo(array1d);

// Declare a two-dimensional string array
String[,] array2d = { { "zero", "0" }, { "one", "1" },
{ "two", "2" }, { "three", "3"},
{ "four", "4" }, { "five", "5" } };
ShowArrayInfo(array2d);

// Declare a three-dimensional integer array
int[, ,] array3d = new int[,,] { { { 1, 2, 3 }, { 4, 5, 6 } },
{ { 7, 8, 9 }, { 10, 11, 12 } } };
ShowArrayInfo(array3d);
}

private static void ShowArrayInfo(Array arr)
{
Console.WriteLine("Length of Array:      {0,3}", arr.Length);
Console.WriteLine("Number of Dimensions: {0,3}", arr.Rank);
// For multidimensional arrays, show number of elements in each dimension.
if (arr.Rank > 1) {
for (int dimension = 1; dimension <= arr.Rank; dimension++)
Console.WriteLine("   Dimension {0}: {1,3}", dimension,
arr.GetUpperBound(dimension - 1) + 1);
}
Console.WriteLine();
}
}
// The example displays the following output:
//       Length of Array:        4
//       Number of Dimensions:   1
//
//       Length of Array:       12
//       Number of Dimensions:   2
//          Dimension 1:   6
//          Dimension 2:   2
//
//       Length of Array:       12
//       Number of Dimensions:   3
//          Dimension 1:   2
//          Dimension 2:   2
//          Dimension 3:   3
``````
``````open System

let showArrayInfo (arr: Array) =
printfn \$"Length of Array:      {arr.Length,3}"
printfn \$"Number of Dimensions: {arr.Rank,3}"
// For multidimensional arrays, show number of elements in each dimension.
if arr.Rank > 1 then
for dimension = 1 to arr.Rank do
printfn \$"   Dimension {dimension}: {arr.GetUpperBound(dimension - 1) + 1,3}"
printfn ""

// Declare a single-dimensional string array
let array1d = [| "zero"; "one"; "two"; "three" |]
showArrayInfo array1d

// Declare a two-dimensional string array
let array2d =
array2D [ [ "zero"; "0" ]; [ "one"; "1" ]
[ "two"; "2" ]; [ "three"; "3" ]
[ "four"; "4" ]; [ "five"; "5" ] ]

showArrayInfo array2d

// Declare a three-dimensional integer array
let array3d = Array3D.create 2 2 3 "zero"

showArrayInfo array3d

// The example displays the following output:
//       Length of Array:        4
//       Number of Dimensions:   1
//
//       Length of Array:       12
//       Number of Dimensions:   2
//          Dimension 1:   6
//          Dimension 2:   2
//
//       Length of Array:       12
//       Number of Dimensions:   3
//          Dimension 1:   2
//          Dimension 2:   2
//          Dimension 3:   3
``````
``````Module Example
Public Sub Main()
' Declare a single-dimensional string array
Dim array1d() As String = {"zero", "one", "two", "three"}
ShowArrayInfo(array1d)

' Declare a two-dimensional string array
Dim array2d(,) As String = {{"zero", "0"}, {"one", "1"},
{"two", "2"}, {"three", "3"},
{"four", "4"}, {"five", "5"}}
ShowArrayInfo(array2d)

' Declare a three-dimensional integer array
Dim array3d(,,) As Integer = New Integer(,,) {{{1, 2, 3}, {4, 5, 6}},
{{7, 8, 9}, {10, 11, 12}}}
ShowArrayInfo(array3d)

End Sub

Private Sub ShowArrayInfo(arr As Array)
Console.WriteLine("Length of Array:      {0,3}", arr.Length)
Console.WriteLine("Number of Dimensions: {0,3}", arr.Rank)
' For multidimensional arrays, show number of elements in each dimension.
If arr.Rank > 1 Then
For dimension As Integer = 1 To arr.Rank
Console.WriteLine("   Dimension {0}: {1,3}", dimension,
arr.GetUpperBound(dimension - 1) + 1)
Next
End If
Console.WriteLine()
End Sub
End Module
' The example displays the following output:
'       Length of Array:        4
'       Number of Dimensions:   1
'
'       Length of Array:       12
'       Number of Dimensions:   2
'          Dimension 1:   6
'          Dimension 2:   2
'
'       Length of Array:       12
'       Number of Dimensions:   3
'          Dimension 1:   2
'          Dimension 2:   2
'          Dimension 3:   3
``````