Array.GetLowerBound Method

Gets the index of the first element of the specified dimension in the array.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

member GetLowerBound : 
        dimension:int -> int


Type: System.Int32

A zero-based dimension of the array whose starting index needs to be determined.

Return Value

Type: System.Int32
The index of the first element of the specified dimension in the array.


dimension is less than zero.


dimension is equal to or greater than Rank.

GetLowerBound(0) returns the starting index of the first dimension of the array, and GetLowerBound(Rank - 1) returns the starting index of the last dimension of the array.

The GetLowerBound method always returns a value that indicates the index of the lower bound of the array, even if the array is empty.

Note that, although most arrays in the .NET Framework are zero-based (that is, the GetLowerBound method returns zero for each dimension of an array), the .NET Framework does support arrays that are not zero-based. Such arrays can be created with the CreateInstance(Type, Int32[], Int32[]) method, and can also be returned from unmanaged code.

This method is an O(1) operation.

The following example uses the GetLowerBound and GetUpperBound methods to display the bounds of a one-dimensional and two-dimensional array and to display the values of their array elements.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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