Array.GetLength(Int32) Méthode

Référence

Définition

Espace de noms:: System

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Important

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Obtient un entier 32 bits qui représente le nombre d’éléments dans la dimension spécifiée de Array.

public:
 int GetLength(int dimension);

public int GetLength (int dimension);

member this.GetLength : int -> int

Public Function GetLength (dimension As Integer) As Integer

Paramètres

dimension: Int32

Dimension de base zéro de Array dont la longueur doit être déterminée.

Retours

Int32

Entier 32 bits qui représente le nombre d’éléments dans la dimension spécifiée.

Exceptions

IndexOutOfRangeException

dimension est inférieur à zéro.

ou -

dimension est supérieur ou égal à Rank.

Exemples

L’exemple suivant montre comment utiliser GetLength pour afficher les dimensions de deux tableaux avec des rangs différents.

using namespace System;

public ref class SamplesArray
{
public:
    static void Main()
    {
        // make a single dimension array
        Array^ MyArray1 = Array::CreateInstance(int::typeid, 5);

        // make a 3 dimensional array
        Array^ MyArray2 = Array::CreateInstance(int::typeid, 5, 3, 2);

        // make an array container
        Array^ BossArray = Array::CreateInstance(Array::typeid, 2);
        BossArray->SetValue(MyArray1, 0);
        BossArray->SetValue(MyArray2, 1);

        int i = 0, j, rank;
        for each (Array^ anArray in BossArray)
        {
            rank = anArray->Rank;
            if (rank > 1)
            {
                Console::WriteLine("Lengths of {0:d} dimension array[{1:d}]", rank, i);
                // show the lengths of each dimension
                for (j = 0; j < rank; j++)
                {
                    Console::WriteLine("    Length of dimension({0:d}) = {1:d}", j, anArray->GetLength(j));
                }
            }
            else
            {
                Console::WriteLine("Lengths of single dimension array[{0:d}]", i);
            }
            // show the total length of the entire array or all dimensions
            Console::WriteLine("    Total length of the array = {0:d}", anArray->Length);
            Console::WriteLine();
            i++;
        }
    }
};

int main()
{
    SamplesArray::Main();
}

/*
This code produces the following output:

Lengths of single dimension array[0]
    Total length of the array = 5

Lengths of 3 dimension array[1]
    Length of dimension(0) = 5
    Length of dimension(1) = 3
    Length of dimension(2) = 2
    Total length of the array = 30
*/

using System;

public class SamplesArray
{
    public static void Main()
    {
        // make a single dimension array
        Array MyArray1 = Array.CreateInstance(typeof(int), 5);

        // make a 3 dimensional array
        Array MyArray2 = Array.CreateInstance(typeof(int), 5, 3, 2);

        // make an array container
        Array BossArray = Array.CreateInstance(typeof(Array), 2);
        BossArray.SetValue(MyArray1, 0);
        BossArray.SetValue(MyArray2, 1);

        int i = 0, j, rank;
        foreach (Array anArray in BossArray)
        {
            rank = anArray.Rank;
            if (rank > 1)
            {
                Console.WriteLine("Lengths of {0:d} dimension array[{1:d}]", rank, i);
                // show the lengths of each dimension
                for (j = 0; j < rank; j++)
                {
                    Console.WriteLine("    Length of dimension({0:d}) = {1:d}", j, anArray.GetLength(j));
                }
            }
            else
            {
                Console.WriteLine("Lengths of single dimension array[{0:d}]", i);
            }
            // show the total length of the entire array or all dimensions
            Console.WriteLine("    Total length of the array = {0:d}", anArray.Length);
            Console.WriteLine();
            i++;
        }
    }
}

/*
This code produces the following output:

Lengths of single dimension array[0]
    Total length of the array = 5

Lengths of 3 dimension array[1]
    Length of dimension(0) = 5
    Length of dimension(1) = 3
    Length of dimension(2) = 2
    Total length of the array = 30
*/

open System

// make a single dimension array
let myArray1 = Array.zeroCreate<int> 5

// make a 3 dimensional array
let myArray2 = Array3D.zeroCreate<int> 5 3 2

// make an array container
let bossArray: Array [] = 
    [|  myArray1
        myArray2 |]

let mutable i = 0
for anArray in bossArray do
    let rank = anArray.Rank;
    if rank > 1 then
        printfn $"Lengths of {rank:d} dimension array[{i:d}]"
        // show the lengths of each dimension
        for j = 0 to rank - 1 do
            printfn $"    Length of dimension({j:d}) = {anArray.GetLength(j):d}"
    else
        printfn $"Lengths of single dimension array[{i:d}]"

    // show the total length of the entire array or all dimensions
    printfn $"    Total length of the array = {anArray.Length:d}\n"
    i <- i + 1


// This code produces the following output:
//     Lengths of single dimension array[0]
//         Total length of the array = 5
//
//     Lengths of 3 dimension array[1]
//         Length of dimension(0) = 5
//         Length of dimension(1) = 3
//         Length of dimension(2) = 2
//     Total length of the array = 30

Public Class SamplesArray
    Public Shared Sub Main()
        ' make a single dimension array
        Dim MyArray1 As Array = Array.CreateInstance(GetType(Integer), 5)

        ' make a 3 dimensional array
        Dim MyArray2 As Array = Array.CreateInstance(GetType(Integer), 5, 3, 2)

        ' make an array container
        Dim BossArray As Array = Array.CreateInstance(GetType(Array), 2)
        BossArray.SetValue(MyArray1, 0)
        BossArray.SetValue(MyArray2, 1)

        Dim i As Integer = 0
        Dim j As Integer
        Dim rank As Integer
        For Each anArray As Array In BossArray
            rank = anArray.Rank
            If rank > 1
                Console.WriteLine("Lengths of {0:d} dimension array[{1:d}]", rank, i)
                ' show the lengths of each dimension
                For j = 0 To rank - 1
                    Console.WriteLine("    Length of dimension({0:d}) = {1:d}", j, anArray.GetLength(j))
                Next j
            Else
                Console.WriteLine("Lengths of single dimension array[{0:d}]", i)
            End If
            ' show the total length of the entire array or all dimensions
            Console.WriteLine("    Total length of the array = {0:d}", anArray.Length)
            Console.WriteLine()
            i = i + 1
        Next anArray
    End Sub
End Class

'This code produces the following output:
'
'Lengths of single dimension array[0]
'    Total length of the array = 5
'
'Lengths of 3 dimension array[1]
'    Length of dimension(0) = 5
'    Length of dimension(1) = 3
'    Length of dimension(2) = 2
'    Total length of the array = 30

Remarques

Un exemple d’élément GetLength est GetLength(0), qui retourne le nombre d’éléments dans la première dimension du Array.

Cette méthode est une opération O(1).

S’applique à

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