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Collection<T>.Insert Method

.NET Framework 4.5

Inserts an element into the Collection<T> at the specified index.

Namespace: System.Collections.ObjectModel
Assembly: mscorlib (in mscorlib.dll)

public void Insert(
	int index,
	T item
)

Parameters

index: Type: System.Int32
The zero-based index at which item should be inserted.

item: Type: T
The object to insert. The value can be null for reference types.

Implements

IList<T>.Insert(Int32, T)

Exceptions

Exception	Condition
ArgumentOutOfRangeException	index is less than zero. -or- index is greater than Count.

Exception

Condition

ArgumentOutOfRangeException

index is less than zero.

-or-

index is greater than Count.

Remarks

Collection<T> accepts null as a valid value for reference types and allows duplicate elements.

If index is equal to Count, item is added to the end of Collection<T>.

This method is an O(n) operation, where n is Count.

Notes to Inheritors

Derived classes can override InsertItem to change the behavior of this method.

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Platforms

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.

Reference

Collection<T> Class

System.Collections.ObjectModel Namespace

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