ReadOnlyCollection<'T>.ICollection.CopyTo Method (Array, Int32)


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Copies the elements of the ICollection to an Array, starting at a particular Array index.

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

private abstract CopyTo : 
        array:Array *
        index:int -> unit
private override CopyTo : 
        array:Array *
        index:int -> unit


Type: System.Array

The one-dimensional Array that is the destination of the elements copied from ICollection. 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 zero.


array is multidimensional.


array does not have zero-based indexing.


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


The type of the source ICollection cannot be cast automatically to the type of the destination array.


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

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

This member is an explicit interface member implementation. It can be used only when the ReadOnlyCollection<'T> instance is cast to an ICollection interface.

Universal Windows Platform
Available since 8
.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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