List<T>.Remove Method
Removes the first occurrence of a specific object from the List<T>.
Namespace: System.Collections.Generic
Assembly: mscorlib (in mscorlib.dll)
Parameters
Return Value
Type: System.Booleantrue if item is successfully removed; otherwise, false. This method also returns false if item was not found in the List<T>.
Implements
ICollection<T>.Remove(T)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 code example demonstrates Remove method. Several properties and methods of the List<T> generic class are used to add, insert, and search the list. After these operations, the list contains a duplicate. The Remove method is used to remove the first instance of the duplicate item, and the contents are displayed. The Remove method always removes the first instance it encounters.
using System; using System.Collections.Generic; public class Example { public static void Main() { List<string> dinosaurs = new List<string>(); Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity); dinosaurs.Add("Tyrannosaurus"); dinosaurs.Add("Amargasaurus"); dinosaurs.Add("Mamenchisaurus"); dinosaurs.Add("Deinonychus"); dinosaurs.Add("Compsognathus"); Console.WriteLine(); foreach(string dinosaur in dinosaurs) { Console.WriteLine(dinosaur); } Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity); Console.WriteLine("Count: {0}", dinosaurs.Count); Console.WriteLine("\nContains(\"Deinonychus\"): {0}", dinosaurs.Contains("Deinonychus")); Console.WriteLine("\nInsert(2, \"Compsognathus\")"); dinosaurs.Insert(2, "Compsognathus"); Console.WriteLine(); foreach(string dinosaur in dinosaurs) { Console.WriteLine(dinosaur); } Console.WriteLine("\ndinosaurs[3]: {0}", dinosaurs[3]); Console.WriteLine("\nRemove(\"Compsognathus\")"); dinosaurs.Remove("Compsognathus"); Console.WriteLine(); foreach(string dinosaur in dinosaurs) { Console.WriteLine(dinosaur); } dinosaurs.TrimExcess(); Console.WriteLine("\nTrimExcess()"); Console.WriteLine("Capacity: {0}", dinosaurs.Capacity); Console.WriteLine("Count: {0}", dinosaurs.Count); dinosaurs.Clear(); Console.WriteLine("\nClear()"); Console.WriteLine("Capacity: {0}", dinosaurs.Capacity); Console.WriteLine("Count: {0}", dinosaurs.Count); } } /* This code example produces the following output: Capacity: 0 Tyrannosaurus Amargasaurus Mamenchisaurus Deinonychus Compsognathus Capacity: 8 Count: 5 Contains("Deinonychus"): True Insert(2, "Compsognathus") Tyrannosaurus Amargasaurus Compsognathus Mamenchisaurus Deinonychus Compsognathus dinosaurs[3]: Mamenchisaurus Remove("Compsognathus") Tyrannosaurus Amargasaurus Mamenchisaurus Deinonychus Compsognathus TrimExcess() Capacity: 5 Count: 5 Clear() Capacity: 5 Count: 0 */
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
