How can I invoke a control with parameters? I've googled this up, but nowhere to find!
This is the error i get:
Additional information: Parameter count mismatch.
And this happens when i do a simple check whether the text property of a textbox control is empty or not. This works in WinForms:
if (this.textboxlink.Text == string.Empty)
SleepThreadThatIsntNavigating(5000);
It jumps from this if the line to the catch block and shows me that message.
This is how i try to invoke the control:
// the delegate:
private delegate void TBXTextChanger(string text);
private void WriteToTextBox(string text)
{
if (this.textboxlink.Dispatcher.CheckAccess())
{
this.textboxlink.Text = text;
}
else
{
this.textboxlink.Dispatcher.Invoke(
System.Windows.Threading.DispatcherPriority.Normal,
new TBXTextChanger(this.WriteToTextBox));
}
}
What am I doing wrong? And since when do i have to invoke a control when i just want to read its content?
When you call Invoke, you're not specifying your argument (text
). When the Dispatcher tries to run your method, it doesn't have a parameter to supply, and you get an exception.
Try:
this.textboxlink.Dispatcher.Invoke(
System.Windows.Threading.DispatcherPriority.Normal,
new TBXTextChanger(this.WriteToTextBox), text);
If you want to read the value from a text box, one option is to use a lambda:
string textBoxValue = string.Empty;
this.textboxlink.Dispatcher.Invoke(DispatcherPriority.Normal,
new Action( () => { textBoxValue = this.textboxlink.Text; } ));
if (textBoxValue == string.Empty)
Thread.Sleep(5000);