c# - Task.Factory.StartNew "action" argument and higher level local variables -

consider this:

void startupdate(datarequest datarequest) {     task.factory.startnew(request => {... "request" ...},          datarequest); } 

now, question: can use datarequest inside lambda expression, instead of passing second parameter startnew method? concern - method executed on different thread , i'm not sure if datarequest keep state when used there.

yes, can.
called closure; it's powerful feature.

the thread-safety, or lack thereof, no different.
whether instance through closure or through startnew parameter, it's still same object. (unless it's struct, indescribably evil)