Based on the answer "If there were such a IsFileAccessible function, it would probably be implemented as a giant try/catch block that attempted to open the file, caught failures, and returned the result."

This individual did not understand the question aka issue. Consider on researching before answering.

The main key for the question is fail fast API where try/catch is costly and time consuming.

if there is a call, the developer can provide the below check.

TimeSpan time;

if (IsLock(file) == true)

{

time = this.GetDuration(file);

}

return time;