C# | Finding the index of first element in the array (original) (raw)

Last Updated : 01 Feb, 2019

GetLowerBound() Method is used to find the index of the first element of the specified dimension in the array. Syntax:

public int GetLowerBound (int dimension);

Here, dimension is a zero-based dimension of the array whose lower bound needs to be determined.Return Value: The return type of this method is System.Int32. This method returns the index of the first element of the specified dimension in the array.Exception: This method will give IndexOutOfRangeException if the value of dimension is less than zero, or equal or greater than Rank.Note:

• 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.
• This method is an O(1) operation.

Below programs illustrate the use of GetLowerBound() Method:Example 1:

CSharp `

// C# program to illustrate the GetLowerBound(Int32) // method in 1-D array using System;

public class GFG {

// Main method
static public void Main()
{

    // 1-D Array
    int[] value = {1, 2, 3, 4, 5, 6, 7};

    // Get the index of the first element
    // in the given Array by using 
    // GetLowerBound(Int32) method
    int myvalue = value.GetLowerBound(0);
    
    Console.WriteLine("Index: {0}", myvalue);
}

}

`

Example 2:

CSharp `

// C# program to illustrate the GetLowerBound(Int32) // method when the array is empty using System;

public class GFG {

// Main method
static public void Main()
{

    // Empty 1-D Array
    int[] value = {};

    // Get the index of the first element
    // in the given Array by using 
    // GetLowerBound(Int32) method
    int myvalue = value.GetLowerBound(0);
    
    Console.WriteLine("Index: {0}", myvalue);
}

}

`

Reference: https://docs.microsoft.com/en-us/dotnet/api/system.array.getlowerbound?view=netcore-2.1