Array.FindIndex<(Of <(T>)>) Method (array<T>[]()[], Predicate<(Of <(T>)>))
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the entire Array.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
Public Shared Function FindIndex(Of T) ( _
array As T(), _
match As Predicate(Of T) _
) As Integer
public static int FindIndex<T>(
T[] array,
Predicate<T> match
)
Type Parameters
- T
The type of the elements of the array.
Parameters
- array
Type: array<T>[]()[]
The one-dimensional, zero-based Array to search.
- match
Type: System..::.Predicate<(Of <(T>)>)
The Predicate<(Of <(T>)>) that defines the conditions of the element to search for.
Return Value
Type: System..::.Int32
The zero-based index of the first occurrence of an element that matches the conditions defined by match, if found; otherwise, –1.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | array is nullNothingnullptra null reference (Nothing in Visual Basic). -or- match is nullNothingnullptra null reference (Nothing in Visual Basic). |
Remarks
The Array is searched forward starting at the first element and ending at the last element.
The Predicate<(Of <(T>)>) is a delegate to a method that returns true if the object passed to it matches the conditions defined in the delegate. The elements of array are individually passed to the Predicate<(Of <(T>)>).
This method is an O(n) operation, where n is the Length of array.
Version Information
Windows Phone OS
Supported in: 8.1, 8.0