Collection<T>.Insert(Int32, T) Method

Definition

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

C#
public void Insert(int index, T item);

Parameters

index
Int32

The zero-based index at which item should be inserted.

item
T

The object to insert. The value can be null for reference types.

Implements

Exceptions

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(Int32, T) to change the behavior of this method.

Applies to

Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0

See also