List<T>::CopyTo Method (Int32, array<T>^, Int32, Int32)
Copies a range of elements from the List<T> to a compatible one-dimensional array, starting at the specified index of the target array.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- index
-
Type:
System::Int32
The zero-based index in the source List<T> at which copying begins.
- array
-
Type:
array<T>^
The one-dimensional Array that is the destination of the elements copied from List<T>. The Array must have zero-based indexing.
- arrayIndex
-
Type:
System::Int32
The zero-based index in array at which copying begins.
- count
-
Type:
System::Int32
The number of elements to copy.
| Exception | Condition |
|---|---|
| ArgumentNullException | array is null. |
| ArgumentOutOfRangeException | index is less than 0. -or- arrayIndex is less than 0. -or- count is less than 0. |
| ArgumentException |
This method uses Array::Copy to copy the elements.
The elements are copied to the Array in the same order in which the enumerator iterates through the List<T>.
This method is an O(n) operation, where n is count.
The following example demonstrates all three overloads of the CopyTo method. A List<T> of strings is created and populated with 5 strings. An empty string array of 15 elements is created, and the CopyTo(array<T>^) method overload is used to copy all the elements of the list to the array beginning at the first element of the array. The CopyTo(array<T>^, Int32) method overload is used to copy all the elements of the list to the array beginning at array index 6 (leaving index 5 empty). Finally, the CopyTo(Int32, array<T>^, Int32, Int32) method overload is used to copy 3 elements from the list, beginning with index 2, to the array beginning at array index 12 (leaving index 11 empty). The contents of the array are then displayed.
using namespace System; using namespace System::Collections::Generic; void main() { List<String^>^ dinosaurs = gcnew List<String^>(); dinosaurs->Add("Tyrannosaurus"); dinosaurs->Add("Amargasaurus"); dinosaurs->Add("Mamenchisaurus"); dinosaurs->Add("Brachiosaurus"); dinosaurs->Add("Compsognathus"); Console::WriteLine(); for each(String^ dinosaurs in dinosaurs ) { Console::WriteLine(dinosaurs); } // Create an array of 15 strings. array<String^>^ arr = gcnew array<String^>(15); dinosaurs->CopyTo(arr); dinosaurs->CopyTo(arr, 6); dinosaurs->CopyTo(2, arr, 12, 3); Console::WriteLine("\nContents of the array:"); for each(String^ dinosaurs in arr ) { Console::WriteLine(dinosaurs); } } /* This code example produces the following output: Tyrannosaurus Amargasaurus Mamenchisaurus Brachiosaurus Deinonychus Tyrannosaurus Compsognathus IndexOf("Tyrannosaurus"): 0 IndexOf("Tyrannosaurus", 3): 5 IndexOf("Tyrannosaurus", 2, 2): -1 */
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1