| Description |
The current ArrayList is searched for the first occurence of the given Value object. If found, the element index of the object is returned, otherwise -1 is returned.
The array is scanned from the start to the end unles the optional FromIndex and Count parameters are provided to give a start and range of elements as appropriate.
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| | Notes | ArrayLists and Arrays are 0 index based.
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| Microsoft MSDN Links |
System.Collections
System.Collections.ArrayList
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| A simple example |
program Project1;
{$APPTYPE CONSOLE}
uses
System.Collections;
var
List : System.Collections.ArrayList;
index : Integer;
begin
// Create our array list object
List := ArrayList.Create;
// Fill it
List.Add('ABC');
List.Add('DEF');
List.Add('ABC');
List.Add('GHI');
// Try to find 'ABC'
index := List.IndexOf('ABC');
Console.WriteLine('The index of ''ABC'' is {0}', index.ToString);
// Try to find 'abc'
index := List.IndexOf('abc');
Console.WriteLine('The index of ''abc'' is {0}', index.ToString);
Console.Readline;
end.
| | Show full unit code | First position of 'ABC' = 0
First position of 'abc' = -1
| | | Using the optional FromIndex and Count parameters | program Project1;
{$APPTYPE CONSOLE}
uses
System.Collections;
var
List : System.Collections.ArrayList;
index : Integer;
begin
// Create our array list object
List := ArrayList.Create;
// Fill it
List.Add('ABC');
List.Add('DEF');
List.Add('ABC');
List.Add('GHI');
List.Add('DEF');
List.Add('GHI');
// Try to find 'GHI' in elements 0 to 2
index := List.IndexOf('GHI', 0, 3);
Console.WriteLine('The index of ''GHI'' from 0 to 2 = {0}',
index.ToString);
// Try to find 'GHI' in elements 3 to 5
index := List.IndexOf('GHI', 3, 3);
Console.WriteLine('The index of ''GHI'' from 3 to 5 = {0}',
index.ToString);
Console.Readline;
end.
| | Show full unit code | 'GHI' from 0 to 2 = -1
'GHI' from 3 to 5 = 3
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