Pass ArrayList to web service in C#

Question

I have web service that should receive param ArrayList

[WebMethod] 
public void SelectPatches(ArrayList selectedPatches){}

But when I call this method from client Visual Studio return error:

Cannot convert from 'System.Collections.ArrayList' to 'object[]'

Is it possible to pass parameter with type ArrayList to Web Service?

Answer 1

Don't use non-generic collections. Use generic, at least List<object> .

Web method should accept array of any type, thus use ToArray() extension method.

Answer 2

You can use arrayList.ToArray() ( MSDN ) to convert an ArrayList to an object[] .

You can also use arrayList.ToArray(Type) ( MSDN ) to convert an ArrayList to an array of the specified type, instead of having to cast each element individually.