Dispatcher.BeginInvoke problems

c# dispatcher
cmaduro picture cmaduro · Apr 8, 2010 · Viewed 20.4k times · Source

I'm getting "An object reference is required for the non-static field, method, or property 'System.Windows.Threading.Dispatcher.BeginInvoke(System.Action)'" for this code.

private void ResponseCompleted(IAsyncResult result)
    {
        HttpWebRequest request = result.AsyncState as HttpWebRequest;
        HttpWebResponse response = request.EndGetResponse(result) as HttpWebResponse;

        using (StreamReader sr = new StreamReader(response.GetResponseStream()))
        {
            Dispatcher.BeginInvoke( () => {
                try
                {
                    XDocument resultsXml = XDocument.Load(sr);
                    QueryCompleted(new QueryCompletedEventArgs(resultsXml));
                }
                catch (XmlException e)
                {
                    XDocument errorXml = new XDocument(new XElement("error", e.Message));
                    QueryCompleted(new QueryCompletedEventArgs(errorXml));
                }
            });

        }
    }
}

Answer

Abhishek Oza picture Abhishek Oza · Jan 25, 2012

Things have changed a bit since the last answer was posted for this question. System.Windows.Threading.Dispatcher.BeginInvoke is now Deployment.Current.Dispatcher.BeginInvoke

Related questions

Change WPF controls from a non-main thread using Dispatcher.Invoke

I have recently started programming in WPF and bumped into the following problem. I don't understand how to use the Dispatcher.Invoke() method. I have experience in threading and I have made a few simple Windows Forms programs where I …

Read More
Using the C# Dispatcher in WPF Applications

I'm building a chat client and am not 100% sure on how to use the dispatcher. So the question is I have a method as such: public void LostConnection() { myGUI.chatBox.AppendText("Lost connection to room: "+ myGUI.UsernameText.ToString() + "\r\n"); } …

Read More
How to put delay before doing an operation in WPF

I tried to use the below code to make a 2 second delay before navigating to the next window. But the thread is invoking first and the textblock gets displayed for a microsecond and landed into the next page. I heard …

Read More