Array.GetLength(Int32) Method
Definition
Important
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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 -> intPublic Function GetLength (dimension As Integer) As IntegerA 32-bit integer that represents the number of elements in the specified dimension.
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
*/
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
An example of GetLength is GetLength(0), which returns the number of elements in the first dimension of the Array.
This method is an O(1) operation.
