ICollection.CopyTo Method

Dictionary(Of TKey, TValue).ICollection.CopyTo Method (Array, Int32)


Copies the elements of the ICollection(Of T) to an array, starting at the specified array index.

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

Private Sub CopyTo (
	array As Array,
	index As Integer
	Implements ICollection.CopyTo


Type: System.Array

The one-dimensional array that is the destination of the elements copied from ICollection(Of T). The array must have zero-based indexing.

Type: System.Int32

The zero-based index in array at which copying begins.

Exception Condition

array is null.


index is less than 0.


array is multidimensional.


array does not have zero-based indexing.


The number of elements in the source ICollection(Of T) is greater than the available space from index to the end of the destination array.


The type of the source ICollection(Of T) cannot be cast automatically to the type of the destination array.

Each element copied from a Dictionary(Of TKey, TValue) is a KeyValuePair(Of TKey, TValue) structure representing a value and its key.


If the type of the source ICollection cannot be cast automatically to the type of the destination array, the nongeneric implementations of ICollection.CopyTo throw an InvalidCastException, whereas the generic implementations throw an ArgumentException.

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

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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