JavaScript and .NET Arrays in Silverlight

Michael Schwarz is writing about Ajax, Silverlight (code-name WPF/E) and Web Application Security. Here is his article about JavaScript and .NET Arrays in Silverlight:

During my tests with the DLR (Dynamic Language Runtime) in Silverlight 1.1 I came accross several things that didn’t work first. Most of them could be fixed by using small workarounds.

Managed JavaScript (compared with IronPython) does not support generics or .NET arrays. Those features require changes or additions to the language syntax, and therefore are not yet implemented. The main focus on the first version of managed JavaScript was to be EcmaScript compatible.

How can I create a byte array?

The simplies way is to create a helper function that will get a JavaScript array as argument and will return a .NET byte array.

This helper function can convert a JavaScript array to a byte array to be passed to .NET methods (i.e. IsolatedStorageFile.Write(…)).

In IronPython generics are already supported, so you can use a List of Byte:

In future releases this will be changed, I hope so, and will be more transparent.

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