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List(T).InsertRange Method

Inserts the elements of a collection into the List(T) at the specified index.

Namespace:  System.Collections.Generic
Assemblies:   mscorlib (in mscorlib.dll)
  System.Collections (in System.Collections.dll)

member InsertRange : 
        index:int * 
        collection:IEnumerable<'T> -> unit


Type: System.Int32

The zero-based index at which the new elements should be inserted.

Type: System.Collections.Generic.IEnumerable(T)

The collection whose elements should be inserted into the List(T). The collection itself cannot be a null reference (Nothing in Visual Basic), but it can contain elements that are a null reference (Nothing in Visual Basic), if type T is a reference type.


collection is a null reference (Nothing in Visual Basic).


index is less than 0.


index is greater than Count.

List(T) accepts a null reference (Nothing in Visual Basic) as a valid value for reference types and allows duplicate elements.

If the new Count (the current Count plus the size of the collection) will be greater than Capacity, the capacity of the List(T) is increased by automatically reallocating the internal array to accommodate the new elements, and the existing elements are copied to the new array before the new elements are added.

If index is equal to Count, the elements are added to the end of List(T).

The order of the elements in the collection is preserved in the List(T).

This method is an O(n + m) operation, where n is the number of elements to be added and m is Count.

The following example demonstrates InsertRange method and various other methods of the List(T) class that act on ranges. After the list has been created and populated with the names of several peaceful plant-eating dinosaurs, the InsertRange method is used to insert an array of three ferocious meat-eating dinosaurs into the list, beginning at index location 3.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 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

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, 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.

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