Hashtable.CopyTo Method (Array, Int32)


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Copies the Hashtable elements to a one-dimensional Array instance at the specified index.

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

abstract CopyTo : 
        array:Array *
        arrayIndex:int -> unit
override CopyTo : 
        array:Array *
        arrayIndex:int -> unit


Type: System.Array

The one-dimensional Array that is the destination of the DictionaryEntry objects copied from Hashtable. 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.


arrayIndex is less than zero.


array is multidimensional.


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


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

The elements are copied to the Array in the same order in which the enumerator iterates through the Hashtable.

To copy only the keys in the Hashtable, use Hashtable.Keys.CopyTo.

To copy only the values in the Hashtable, use Hashtable.Values.CopyTo.

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

The following example shows how to copy the list of keys or the list of values in a Hashtable into a one-dimensional Array.

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

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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