后台工作访问UI有道 [英] Background worker proper way to access UI
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问题描述
我不知道如果我正确地做这个,但我有下面的代码,我使用(单击button,做_DoWork)。问题是这样的:我怎么叫UI获得TextBox1的1和TextBox的价值,因为他们不能被称为,因为它们是在不同的线程。我应该使用的调度员?
I'm not sure if I'm doing this correctly, but I have the following code that I am using (click button1, do the _DoWork). The question is this: how do I call the UI to get the values of textbox1 and textbox2 as they cannot be called as they are on a different thread. Should I be using dispatchers?
private void button1_Click(object sender, RoutedEventArgs e)
{
if (textBox1.Text == "")
{
MessageBox.Show("Please enter a username and password", "Error", MessageBoxButton.OK, MessageBoxImage.Warning);
}
else
{
bw.DoWork += new DoWorkEventHandler(bw_DoWork);
bw.RunWorkerAsync();
}
}
private void bw_DoWork(object sender, DoWorkEventArgs e)
{
Console.WriteLine("asd");
UserManagement um = new UserManagement(sm.GetServerConnectionString());
if (um.AuthUser(textBox1.Text, textBox2.Password))
{
MainWindow mw = new MainWindow();
mw.Show();
this.Close();
}
else
{
if (um.Timeout)
{
MessageBox.Show("Could not connect to server, please check your configuration", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
else
{
MessageBox.Show("Incorrect username or password", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
}
我应该可以使用后台工作?
Should I be using background worker?
推荐答案
您可以通过的RunWorkerAsync调用的参数数据传递到工人,并通过DoWorkEventArgs数据传递出。结果...
You can pass data into the worker via the argument of the RunWorkerAsync call and pass data out via DoWorkEventArgs.Result...
class AuthUserData
{
public string Name;
public string Password;
}
private void button1_Click(object sender, EventArgs e)
{
var authData = new AuthUserData() { Name = textBox1.Text, Password = textBox2.Text };
worker.RunWorkerAsync(authData);
}
void worker_DoWork(object sender, DoWorkEventArgs e)
{
// On the worker thread...cannot make UI calls from here.
var authData = (AuthUserData)e.Argument;
UserManagement um = new UserManagement(sm.GetServerConnectionString());
e.Result = um;
e.Cancel = um.AuthUser(textBox1.Text, textBox2.Password));
}
void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
// Back on the UI thread....UI calls are cool again.
var result = (UserManagement)e.Result;
if (e.Cancelled)
{
// Do stuff if UserManagement.AuthUser succeeded.
}
else
{
// Do stuff if UserManagement.AuthUser failed.
}
}
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