invoke

I have a server application that receives information over a network and processes it. The server is multi-threaded and handles multiple sockets at time, and threads are created without my control through BeginInvoke and EndInvoke style methods, which are chained by corresponding callback functions. I'm trying to create a form, in addition to the main GUI, that displays a ListBox item populated by items describing the currently connected sockets. So, what I'm basically trying to do is add an item to the ListBox using its Add() function, from the thread the appropriate callback function is

I have some code as follows. This is running on "Thread 2" WebBrowser browser = this.webBrowser browser.Invoke(new MethodInvoker(delegate { browser.Document.GetElementById("somebutton").InvokeMember("click"); })); Thread.Sleep(500); browser.Invoke(new MethodInvoker(delegate { browser.Document.GetElementById("username").SetAttribute("value", username); })); //folowed by several more similar statments Essentially I am Invoking some methods on a WebBrowser control created on a different thread, "Thread 1". If the element on the current page loaded in browser does not contain an element "somebtn"

This is my situation, there are 2 Classes and my main form Form1: Class1: has a method doSomethingAndCall(callback) which creates a new thread Class2: has dynamic created controls with a button that fires Class1.doSomethingAndCall(newCallback) in code it looks like this (it starts at Class2.Button_Click): Class Class1 public shared sub doSomethingAndCallAsync(state as object) Console.WriteLine(Form1.InvokeRequired) 'output: false Console.WriteLine(Form1.IsHandleCreated) 'output: false Form1.Invoke(state.callback) 'throws System.InvalidOperationException end sub public shared sub

Long story short, I'm having a hell of a time trying to figure out how to use invoke and/or delegates to update the userform from a separate class when using threading. I'm quite sure it's something silly and obvious to someone with more experience. I know a delegate is probably required, but all my efforts seem to only work when it's being called from main thread. I've been looking around the internet for half the day, and there's just something I'm not getting. Here's some pseudo-code as an example: This option works: Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object

(I have a workaround for this problem, but it's not the first time I've been bitten, so I'm trying to understand exactly what's going on.) From my application, I ShowDialog a form. On the form is a button, which when clicked calls code on another (non-Gui) thread. The non-GUI thread sends back statuses ( Pushed then Released ) via a Control.Invoke When the form sees the Pushed , it invokes form.Hide() When the form sees the Released , it changes the appearance of the button. What happens is that sometimes, but not everytime, the non-Gui thread gets 'stuck' trying to send the Released . No

I have the following piece of code in a base-class: public static void InvokeExternal(Delegate d, object param, object sender) { if (d != null) { //Check each invocation target foreach (Delegate dDelgate in d.GetInvocationList()) { if (dDelgate.Target != null && dDelgate.Target is System.ComponentModel.ISynchronizeInvoke && ((System.ComponentModel.ISynchronizeInvoke)(dDelgate.Target)).InvokeRequired) { //If target is ISynchronizeInvoke and Invoke is required, invoke via ISynchronizeInvoke ((System.ComponentModel.ISynchronizeInvoke)(dDelgate.Target)).Invoke(dDelgate, new object[] { sender,

VB.NET 2010, .NET 4 Hello, I recently read about using SynchronizationContext objects to control the execution thread for some code. I have been using a generic subroutine to handle (possibly) cross-thread calls for things like updating UI controls that utilize Invoke . I'm an amateur and have a hard time understanding the pros and cons of any particular approach. I am looking for some insight on which approach might be preferable and why. Update: This question is motivated, in part, by statements such as the following from the MSDN page on Control.InvokeRequired . An even better solution is

Alternate question: Why is VS10 so keen to complain about Invoke? In my continuing quest to make my app work become the worlds best C# programmer, I have decided that threads are a Good Thing™. MSDN has a helpful article on making thread-safe calls to controls , but it (and seemingly every other article on the subject) obliquely references a method called Invoke. Sometimes even BeginInvoke, which I've read is to be preferred . All this would be great, if I could get visual studio to recognise Invoke. MSDN says that it is contained in the System.Windows.Forms assembly , but I'm already 'using'