c# WPF Error The calling thread cannot access this object because a different thread owns it.

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/// <summary>
/// function put username and password
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void m_vpn_needLoginAndPassword(object sender, NeedLoginAndPasswordEventArgs e)
{
   e.UserName = username.Text;
   e.Password = password.Password;

}

error

The calling thread cannot access this object because a different thread owns it.

i use

C#

if (Application.Current.Dispatcher.CheckAccess())
{
   e.UserName = username.Text;
   e.Password = password.Password;
}
else
{
    //Other wise re-invoke the method with UI thread access
   e.UserName = username.Text;
   e.Password = password.Password;

}</pre>

not work

thank you

Posted 28-Jun-13 15:38pm

witawat

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-06-28T18:22:00

Solution 1

All correct, exactly as the exception message tells you. On the else branch, use Dispatcher.Invoke:
http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.invoke.aspx[^].

For some explanations, please see my past answers:
Control.Invoke() vs. Control.BeginInvoke()[^],
Problem with Treeview Scanner And MD5[^].

—SA

Posted 28-Jun-13 18:22pm

Sergey Alexandrovich Kryukov

Comments

witawat 29-Jun-13 2:06am

hello

i not understand Invoke function if code work at c# not use wpf ..
///

/// function put username and password
///

/// <param name="sender"></param>
/// <param name="e"></param>
private void m_vpn_needLoginAndPassword(object sender, NeedLoginAndPasswordEventArgs e)
{
if (Application.Current.Dispatcher.CheckAccess())
{
e.UserName = username.Text;
e.Password = password.Password;
}
else
{
//Other wise re-invoke the method with UI thread access
e.UserName = username.Text;
e.Password = password.Password;

// Can use code ?

}
}

Sergey Alexandrovich Kryukov 29-Jun-13 12:10pm

Why are you repeating the code? Why didn't you follow my advice?
Even if it's new, please move it to the question using "Improve question".
—SA