我正在学习/尝试 Async Await 功能。我有一个调用此代码的按钮单击事件:
//first select the direcgtory in this event. Then called the async function..to be written
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
foldername = folderBrowserDialog1.SelectedPath;
}
// CreateFilesParellel();
var x = CreateAsync();
下面是函数 CreateAsync 的样子:Mode details go here
async Task<int> CreateAsync()
{
string fileType;
List<Task> tasks = new List<Task>();
//get the files in the existing directory.
var files = Directory.GetFiles(foldername);
fileType = Path.GetExtension(files[0]);
var filepath = Path.GetFullPath(files[0]);
string d = Path.GetDirectoryName(files[0]);
var ss = Path.GetFileNameWithoutExtension(files[0]);
var progress = new Progress<string>();
Stopwatch sw = new Stopwatch();
sw.Start();
for (int i = 0; i < 100000; i++)
{
Action act = () =>
{
File.Copy(files[0], d + "\\" + ss + i.ToString() + fileType);
};
//await File.Copy(files[0], d + "\\" + ss + i.ToString() + fileType);
Task t = new Task(act);
tasks.Add(t);
// t.Start();
progress.ProgressChanged += (s, e) =>
{
textBox1.Text = System.Environment.NewLine;
textBox1.Text = "Creating file = " + e;
};
}
await Task.WhenAll(tasks);
sw.Stop();
string ExecutionTimeTaken = string.Format("Minutes :{0}\nSeconds :{1}\n Mili seconds :{2}", sw.Elapsed.Minutes, sw.Elapsed.Seconds, sw.Elapsed.TotalMilliseconds);
MessageBox.Show(ExecutionTimeTaken);
return 0;
}
所以这就是问题所在。当我运行此代码时,没有任何反应。意思是文件没有被创建。我究竟做错了什么?或者我错过了什么?