EnumerableExtensionsIndexOf(IEnumerable, FuncObject, Boolean) Method

Searches for an element in the source enumeration where the specified predicate returns .


Namespace: KGySoft.CoreLibraries
Assembly: KGySoft.CoreLibraries (in KGySoft.CoreLibraries.dll) Version: 7.0.0
public static int IndexOf(
	this IEnumerable source,
	Func<Object?, bool> predicate


source  IEnumerable
The source enumeration to search.
predicate  FuncObject, Boolean
The predicate to use for the search.

Return Value

The index of the found element, or -1 if there was no match.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


ArgumentNullExceptionsource or predicate is .

See Also