List(T).LastIndexOf Method (T, Int32)
Searches for the specified object and returns the zero-based index of the last occurrence within the range of elements in the List(T) that extends from the first element to the specified index.
Assembly: mscorlib (in mscorlib.dll)
- Type: T
The object to locate in the List(T). The value can be a null reference (Nothing in Visual Basic) for reference types.
- Type: System.Int32
The zero-based starting index of the backward search.
The List(T) is searched backward starting at index and ending at the first element.
This method determines equality using the default equality comparer EqualityComparer(T).Default for T, the type of values in the list.
This method performs a linear search; therefore, this method is an O(n) operation, where n is the number of elements from the beginning of the List(T) to index.
The following code example demonstrates all three overloads of the LastIndexOf method. A List(T) of strings is created, with one entry that appears twice, at index location 0 and index location 5. The LastIndexOf(T) method overload searches the entire list from the end, and finds the second occurrence of the string. The method overload is used to search the list backward beginning with index location 3 and continuing to the beginning of the list, so it finds the first occurrence of the string in the list. Finally, the LastIndexOf(T, Int32, Int32) method overload is used to search a range of four entries, beginning at index location 4 and extending backward (that is, it searches the items at locations 4, 3, 2, and 1); this search returns –1 because there are no instances of the search string in that range.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.