当我尝试使用时

Task<List<string>> all = await Task.WhenAll(new Task[] { t,t2 }).ConfigureAwait(false);

我收到编译器错误

Cannot implicitly convert type ‘void’ to
'System.Threading.Tasks.Task<System.Collections.Generic.List<string>>

这两个任务都是类似的调用方法.

private Task<List<string>> GetFiles(string path)
{
    files = new List<string>();
    return  Task.Run(() =>
    {
       //remove for brevity 
        return files;
    });
}