Array.GetLength(Int32) Methode

Definition

Ruft eine 32-Bit-Ganzzahl ab, die die Anzahl der Elemente in der angegebenen Dimension des Array angibt.Gets a 32-bit integer that represents the number of elements in the specified dimension of the Array.

public:
 int GetLength(int dimension);
public int GetLength (int dimension);
member this.GetLength : int -> int
Public Function GetLength (dimension As Integer) As Integer

Parameter

dimension
Int32

Eine nullbasierte Dimension des Array, deren Länge bestimmt werden soll.A zero-based dimension of the Array whose length needs to be determined.

Gibt zurück

Int32

Eine 32-Bit-Ganzzahl, die die Anzahl der Elemente in der angegebenen Dimension angibt.A 32-bit integer that represents the number of elements in the specified dimension.

Ausnahmen

dimension ist kleiner als Null.dimension is less than zero.

- oder --or-

dimension ist größer oder gleich Rank.dimension is equal to or greater than Rank.

Beispiele

Im folgenden Beispiel wird gezeigt, wie verwendet wird, GetLength um die Dimensionen von zwei Arrays mit unterschiedlichen Ränge anzuzeigen.The following example shows how to use GetLength to display the dimensions of two arrays with different ranks.

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
*/
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

Hinweise

Ein Beispiel für GetLength ist GetLength(0) , das die Anzahl der Elemente in der ersten Dimension von zurückgibt Array .An example of GetLength is GetLength(0), which returns the number of elements in the first dimension of the Array.

Diese Methode ist ein O (1)-Vorgang.This method is an O(1) operation.

Gilt für:

Siehe auch