List<T>.RemoveAt Method (Int32)
.NET Framework (current version)
Removes the element at the specified index of the List<T>.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- index
-
Type:
System.Int32
The zero-based index of the element to remove.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException |
When you call RemoveAt to remove an item, the remaining items in the list are renumbered to replace the removed item. For example, if you remove the item at index 3, the item at index 4 is moved to the 3 position. In addition, the number of items in the list (as represented by the Count property) is reduced by 1.
This method is an O(n) operation, where n is (Count - index).
The following example demonstrates how to add, remove, and insert a simple business object in a List<T>.
using System; using System.Collections.Generic; // Simple business object. A PartId is used to identify the type of part // but the part name can change. public class Part : IEquatable<Part> { public string PartName { get; set; } public int PartId { get; set; } public override string ToString() { return "ID: " + PartId + " Name: " + PartName; } public override bool Equals(object obj) { if (obj == null) return false; Part objAsPart = obj as Part; if (objAsPart == null) return false; else return Equals(objAsPart); } public override int GetHashCode() { return PartId; } public bool Equals(Part other) { if (other == null) return false; return (this.PartId.Equals(other.PartId)); } // Should also override == and != operators. } public class Example { public static void Main() { // Create a list of parts. List<Part> parts = new List<Part>(); // Add parts to the list. parts.Add(new Part() {PartName="crank arm", PartId=1234}); parts.Add(new Part() { PartName = "chain ring", PartId = 1334 }); parts.Add(new Part() { PartName = "regular seat", PartId = 1434 }); parts.Add(new Part() { PartName = "banana seat", PartId = 1444 }); parts.Add(new Part() { PartName = "cassette", PartId = 1534 }); parts.Add(new Part() { PartName = "shift lever", PartId = 1634 }); // Write out the parts in the list. This will call the overridden ToString method // in the Part class. Console.WriteLine(); foreach (Part aPart in parts) { Console.WriteLine(aPart); } // Check the list for part #1734. This calls the IEquitable.Equals method // of the Part class, which checks the PartId for equality. Console.WriteLine("\nContains(\"1734\"): {0}", parts.Contains(new Part {PartId=1734, PartName="" })); // Insert a new item at position 2. Console.WriteLine("\nInsert(2, \"1834\")"); parts.Insert(2, new Part() { PartName = "brake lever", PartId = 1834 }); //Console.WriteLine(); foreach (Part aPart in parts) { Console.WriteLine(aPart); } Console.WriteLine("\nParts[3]: {0}", parts[3]); Console.WriteLine("\nRemove(\"1534\")"); // This will remove part 1534 even though the PartName is different, // because the Equals method only checks PartId for equality. parts.Remove(new Part(){PartId=1534, PartName="cogs"}); Console.WriteLine(); foreach (Part aPart in parts) { Console.WriteLine(aPart); } Console.WriteLine("\nRemoveAt(3)"); // This will remove the part at index 3. parts.RemoveAt(3); Console.WriteLine(); foreach (Part aPart in parts) { Console.WriteLine(aPart); } /* ID: 1234 Name: crank arm ID: 1334 Name: chain ring ID: 1434 Name: regular seat ID: 1444 Name: banana seat ID: 1534 Name: cassette ID: 1634 Name: shift lever Contains("1734"): False Insert(2, "1834") ID: 1234 Name: crank arm ID: 1334 Name: chain ring ID: 1834 Name: brake lever ID: 1434 Name: regular seat ID: 1444 Name: banana seat ID: 1534 Name: cassette ID: 1634 Name: shift lever Parts[3]: ID: 1434 Name: regular seat Remove("1534") ID: 1234 Name: crank arm ID: 1334 Name: chain ring ID: 1834 Name: brake lever ID: 1434 Name: regular seat ID: 1444 Name: banana seat ID: 1634 Name: shift lever RemoveAt(3) ID: 1234 Name: crank arm ID: 1334 Name: chain ring ID: 1834 Name: brake lever ID: 1444 Name: banana seat ID: 1634 Name: shift lever */ } }
Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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