List(T).LastIndexOf Method (T, Int32, 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 contains the specified number of elements and ends at the specified index.
Assemblies: mscorlib (in mscorlib.dll)
System.Collections (in System.Collections.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.
- Type: System.Int32
The number of elements in the section to search.
The List(T) is searched backward starting at index and ending at index minus count plus 1, if count is greater than 0.
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 count.
The following 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 LastIndexOf(T, Int32) 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 method overload is used to search a range of 4 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.
.NET FrameworkSupported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
XNA FrameworkSupported in: 3.0, 2.0, 1.0
Portable Class LibrarySupported in: Portable Class Library
Supported in: Windows Phone 8.1
Supported in: Windows Phone Silverlight 8.1
Supported in: Windows Phone Silverlight 8