WPF：使用命令绑定和线程无法控制按钮的启用/禁用状态

I have a WPF app that simply contains a Button and a Textbox to display some output. When the user clicks the Button, a thread starts which disables the Button, prints stuff to the output Textbox, then the thread stops (at which point I want the Button to be enabled again).I have a WPF app that simply contains a Button