Array.GetLength(Int32) Methode

Definitie

Naamruimte:
System
Assembly's:
mscorlib.dll, System.Runtime.dll
Assembly's:
netstandard.dll, System.Runtime.dll
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll
Bron:
Array.cs
Bron:
Array.cs
Bron:
Array.CoreCLR.cs
Bron:
Array.CoreCLR.cs
Bron:
Array.CoreCLR.cs

Hiermee haalt u een 32-bits geheel getal op dat het aantal elementen in de opgegeven dimensie van 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

Parameters

dimension
Int32

Een op nul gebaseerde dimensie van de Array wiens lengte moet worden bepaald.

Retouren

Int32

Een 32-bits geheel getal dat het aantal elementen in de opgegeven dimensie aangeeft.

Uitzonderingen

IndexOutOfRangeException

dimension is kleiner dan nul.

– of –

dimension is gelijk aan of groter dan Rank.

Voorbeelden

In het volgende voorbeeld ziet u hoe GetLength u de dimensies van twee matrices met verschillende rangschikkingen kunt weergeven.

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

Opmerkingen

Een voorbeeld hiervan GetLength is GetLength(0), waarmee het aantal elementen in de eerste dimensie van de Array.

Deze methode is een O(1)-bewerking.

Van toepassing op

Zie ook