Flex - 如何将字符串变量作为文件下载到本地计算机？

I have a String variable in my flex (flash builder 4) application containing CSV data. I need to allow the user to download this data to a local file. For example, giving them a "csv" button to click and it might present them with a save file dialog (and I would be sending the contents of my string variable).I have a String variable in my flex (flash buil