i have a program that determines whether the device is connected to internet or not, when i start the program the label tells if the device is connected or not, but when i disconnect or connect the device to internet, the label does not update, and i need to restart the app in order to see the label change.
here's my code
public static bool conexion()
{
while (true)
{
try
{
using (var cliente = new WebClient())
using (cliente.OpenRead("http://google.com"))
return true;
}
catch
{
return false;
}
}
}
public MainWindow()
{
InitializeComponent();
if (conexion() == true)
{
label.Content = "Esta conectado";
label.Foreground = new SolidColorBrush(Colors.Green);
}
else if(conexion() == false)
{
label.Content = "No esta conectado";
label.Foreground = new SolidColorBrush(Colors.Red);
}
Related
I have a simple PopUp window in my Windows Phone app, which takes another window as a child:
private static MeterChangeDialog_Popup _instance = null;
private static Popup _meterchangepop;
private MeterChangeDialog_Popup()
{
_meterchangepop = new Popup();
}
public static MeterChangeDialog_Popup GetInstance()
{
if (_instance == null)
{
_instance = new MeterChangeDialog_Popup();
}
return _instance;
}
public void OpenClosePopup()
{
if (_meterchangepop.IsOpen)
{
_meterchangepop.IsOpen = false;
SingletonContainer.GetInstance().MeterChangeCurrentSelected = null;
}
else
{
_meterchangepop.IsOpen = true;
_meterchangepop.Child = new MeterChangePage();
}
}
But while this window is open, I can still do stuff at the window behind it, which I should not be able to do.
Can I somehow disable every window behind the PopUp window ?
Problem:
I have a Winform application with a form en on this form i have a databound DataGridView.
The datagridview is updated from the backend by updating the bind object continuesly using a timer to get the data every 10 seconds. In order to update the gui with this new data i call a RefreshDatabindings. (if i do not do this, the gui is nog updated, i am binding to a BindingList and the object implement the INotifyPropertyChanged)
When the form is big enough to show the whole datagridview at once everything is working wel. But when the form is not big enough to show the hole datagridview a scrollbar appears.
When i scroll to the right to see the rest of the datagridview i see the gui flickering (only the part that wasn't visible before scrolling). When i strech the form to make de gridview fitting again, everything is working wel (no flashing and flickering). the flickering only happens when i have to scroll.
I am lost, can please somebody help me :)?
I allready tryed the DoubleBuffered = true.
Thanks in advance!
BindingList<InstanceTableViewModel> viewModelList;
public Form1()
{
InitializeComponent();
DoubleBuffered = true;
functionParamList = new List<FunctionParameter>();
functionParamList.Add(new FunctionParameter { DeviceValue = 100, InstanceId = "1", Name = "A" });
functionParamList.Add(new FunctionParameter { DeviceValue = 200, InstanceId = "2", Name = "B" });
functionParamList.Add(new FunctionParameter { DeviceValue = 300, InstanceId = "3", Name = "C" });
viewModelList = CreateInstanceTableViewModelList();
dataGridView1.DataSource = viewModelList;
//Create timer
updateDataTimer = new System.Timers.Timer();
updateDataTimer.Interval = 500;
updateDataTimer.Elapsed += updateDataTimer_Elapsed;
updateDataTimer.Start();
}
private void updateDataTimer_Elapsed(object sender, ElapsedEventArgs e)
{
ThreadPool.QueueUserWorkItem(ReadDataThreadPoolMethod);
}
private void ReadDataThreadPoolMethod(object state)
{
Random random = new Random();
int randomNumber = random.Next(0, 100);
foreach (FunctionParameter param in functionParamList)
{
param.DeviceValue = Convert.ToInt64(randomNumber);
}
}
void functionParameter_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
var functionParameter = sender as FunctionParameter;
var propertyName = e.PropertyName;
var propertyValue = functionParameter.DeviceValue;
var parameterName = functionParameter.Name;
UpdateViewModel(functionParameter.InstanceId, propertyName, propertyValue, parameterName);
}
private void UpdateViewModel(string instanceId, string propertyName, long propertyValue, string parameterName)
{
var instanceViewModel = viewModelList.Single(x => x.InstanceId == instanceId && x.NameLabel == parameterName);
if (instanceViewModel != null)
{
instanceViewModel.ValueHex = Convert.ToUInt16(propertyValue);
}
ResetBindingsSource();
}
delegate void UpdateBindingsInvoker();
public void ResetBindingsSource()
{
if (!this.IsDisposed)
{
if (this.InvokeRequired)
{
this.Invoke(new UpdateBindingsInvoker(UpdateDataGrid));
}
else
{
UpdateDataGrid();
}
}
}
private void UpdateDataGrid()
{
dataGridView1.Refresh();
}
So here my solution:
You only uses the Forms DoubleBuffering, but the following code is an extension method to the DataGridview and successfully works (at my tests ;)
public static void DoubleBuffered(this DataGridView dgv, bool setting)
{
Type dgvType = dgv.GetType();
PropertyInfo pi = dgvType.GetProperty("DoubleBuffered",
BindingFlags.Instance | BindingFlags.NonPublic);
pi.SetValue(dgv, setting, null);
}
I found this code right here at Codeprojct.
You can use it in this way:
YourDataGridView.DoubleBuffered(true);
I hope i could help you ^^
i have the pretty same sample as mentioned here.
Fast concluded: MainWindow closes when the last childwindow is closed.
My Problem: I couldn't solve my problems with the described solutions. I can't produce a program where it als takes place. Only in one of my bigger progs. Maybe someone has an idea or knows any further steps.
Thanks for reading - Thomas
As requested here's a bit of code:
This is the part in the MainWindow:
bool editAfterSearch = false;
Movie selectedMovie = (Movie)this.listView.SelectedItem;
Movie backup = (Movie)selectedMovie.Clone();
if (new OnlineSearchWindow().EditMovieViaOnlineSearch(ref selectedMovie, out editAfterSearch))
{
this.coverFlow.Update(selectedMovie);
}
And that's the part of the ChildWindow:
public bool EditMovieViaOnlineSearch(ref Movie preset, out bool editAfter)
{
this.exitWithOk = false;
this.editMovieAfterSearch = false;
this.tbx_SearchTerm.Text = preset.Title;
this.linkedMovie = preset;
this.ShowDialog();
editAfter = editMovieAfterSearch;
if (this.exitWithOk)
{
this.linkedMovie.CloneOnlineInformation(ref preset);
preset.Bitmap = this.linkedMovie.Bitmap;
return true;
}
else
{
return false;
}
}
Try playing with the ShutDownMode property of your App.xaml.cs. The 3 values are OnMainWindowClose, OnLastWindowClose, and OnExplicitShutdown, and the default is OnLastWindowClose
public partial class App : Application
{
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
this.ShutdownMode = System.Windows.ShutdownMode.OnMainWindowClose;
}
}
The below code worked for me.
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (MessageBoxResult.No == (MessageBox.Show("Are you sure you want to close this?.", "ProjectName", MessageBoxButton.YesNo)))
{
e.Cancel = true;
foreach (var item in Application.Current.Windows)
{
Window window = item as Window;
if (window.Title == "PopUpWindowName")
{
window.Topmost = true;
break;
}
}
return;
}
else
{
base.OnClosed(e);
Application.Current.Shutdown();
}
}
you can try setting the child window's allowShutDown to false and then show the mainwindow. I'm assuming you will start with mainwindow's visibility set to hidden.
Application.Current.MainWindow.Visibility = System.Windows.Visibility.Visible;
this.allowShutDown = false;
The allowShutDown will be your own property which u can set to enable you have to handle the closing event.
I use a custom textblock in my WPF Application, when I use it in WPF Windows it worked good but when I use it in a WPF Page it make a problem. When I click on a link in my Custom Control it browse the link and show in browser but the WPF page navigate back to another WPF Page too (first page)
namespace Dtwitter.Controls
{
public class TweetTextBlock : TextBlock
{
public TweetTextBlock()
{
}
#region Dependency properties
public string TweetText
{
get { return (string)GetValue(TweetTextProperty); }
set { SetValue(TweetTextProperty, value); }
}
// Using a DependencyProperty as the backing store for TweetText. This enables animation, styling, binding, etc...
public static readonly DependencyProperty TweetTextProperty =
DependencyProperty.Register("TweetText", typeof(string), typeof(TweetTextBlock),
new FrameworkPropertyMetadata(string.Empty, new PropertyChangedCallback(OnTweetTextChanged)));
#endregion
private static void OnTweetTextChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
string text = args.NewValue as string;
if (!string.IsNullOrEmpty(text))
{
TweetTextBlock textblock = (TweetTextBlock)obj;
textblock.Inlines.Clear();
textblock.Inlines.Add(" ");
string[] words = Regex.Split(text, #"([ \(\)\{\}\[\]])");
string possibleUserName = words[0].ToString();
if ((possibleUserName.Length > 1) && (possibleUserName.Substring(1, 1) == "#"))
{
textblock = FormatName(textblock, possibleUserName);
words.SetValue("", 0);
}
foreach (string word in words)
{
// clickable hyperlinks
if (UrlShorteningService.IsUrl(word))
{
try
{
Hyperlink link = new Hyperlink();
link.NavigateUri = new Uri(word);
link.Inlines.Add(word);
link.Click += new RoutedEventHandler(link_Click);
link.ToolTip = "Open link in the default browser";
textblock.Inlines.Add(link);
}
catch
{
//TODO:What are we catching here? Why? Log it?
textblock.Inlines.Add(word);
}
}
// clickable #name
else if (word.StartsWith("#"))
{
textblock = FormatName(textblock, word);
}
// clickable #hashtag
else if (word.StartsWith("#"))
{
string hashtag = String.Empty;
Match foundHashtag = Regex.Match(word, #"#(\w+)(?<suffix>.*)");
if (foundHashtag.Success)
{
hashtag = foundHashtag.Groups[1].Captures[0].Value;
Hyperlink tag = new Hyperlink();
tag.Inlines.Add(hashtag);
string hashtagUrl = "http://search.twitter.com/search?q=%23{0}";
// The main application has access to the Settings class, where a
// user-defined hashtagUrl can be stored. This hardcoded one that
// is used to set the NavigateUri is just a default behavior that
// will be used if the click event is not handled for some reason.
tag.NavigateUri = new Uri(String.Format(hashtagUrl, hashtag));
tag.ToolTip = "Show statuses that include this hashtag";
tag.Tag = hashtag;
tag.Click += new RoutedEventHandler(hashtag_Click);
textblock.Inlines.Add("#");
textblock.Inlines.Add(tag);
textblock.Inlines.Add(foundHashtag.Groups["suffix"].Captures[0].Value);
}
}
else
{
textblock.Inlines.Add(word);
}
}
textblock.Inlines.Add(" ");
}
}
public static TweetTextBlock FormatName(TweetTextBlock textblock, string word)
{
string userName = String.Empty;
string firstLetter = word.Substring(0, 1);
Match foundUsername = Regex.Match(word, #"#(\w+)(?<suffix>.*)");
if (foundUsername.Success)
{
userName = foundUsername.Groups[1].Captures[0].Value;
Hyperlink name = new Hyperlink();
name.Inlines.Add(userName);
name.NavigateUri = new Uri("http://twitter.com/" + userName);
name.ToolTip = "View #" + userName + "'s recent tweets";
name.Tag = userName;
name.Click += new RoutedEventHandler(name_Click);
if (firstLetter != "#")
textblock.Inlines.Add(firstLetter);
textblock.Inlines.Add("#");
textblock.Inlines.Add(name);
textblock.Inlines.Add(foundUsername.Groups["suffix"].Captures[0].Value);
}
return textblock;
}
static void link_Click(object sender, RoutedEventArgs e)
{
try
{
System.Diagnostics.Process.Start(((Hyperlink)sender).NavigateUri.ToString());
}
catch
{
//TODO: Log specific URL that caused error
MessageBox.Show("There was a problem launching the specified URL.", "Error", MessageBoxButton.OK, MessageBoxImage.Exclamation);
}
}
}
}
change your link click method to
static void link_click(Object sender, RequestNavigateEventArgs e) {
try {
System.Diagnostics.Process.Start(e.Uri.ToString());
} catch {
//TODO: Log specific URL that caused error
MessageBox.Show("There was a problem launching the specified URL.", "Error", MessageBoxButton.OK, MessageBoxImage.Exclamation);
} finally {
e.Handled = true;
}
}
change your
link.Click+=new RoutedEventHandler(link_Click);
to
link.RequestNavigate+=new RequestNavigateEventHandler(link_Click);
Set e.Handled=true in link_click to mark you've dealt with the link click to prevent the framework from additionally processing your link click further.
Alternatively you may be able to just set the TargetName property of Hyperlink to "_blank" and not need the process start command
The code below should make it work the same way in both cases (Page and Window)....
try this to open the hyperlink in web browser in MouseDown of the Hyperlink object.
Process.Start((e.OriginalSource as Hyperlink).NavigateUri.ToString());
e.Handled = true;
Let me know if this helps.
I have a MVP like application, all expensive operations are using Async calls and display an Ajax like gif that indicates the user that something is happening without blocking the main thread.
Example:
Data entry form, user clicks Save, an async operation takes place and when it finishes restores the screen to an editable form without blocking the UI thread (in other terms, not blocking other visible windows in the application).
Everything works fine in here, but given the following scenario:
User tries to close the Form, and gets a confirmation message that asks the user if he is sure that he is going to close if he prefers to Save before closing.
When the users clicks 'Save' the same logic explained before takes place, but I'm forced to wait for this call to finish in the UI thread (in case there are any errors in the async call or whatever) and I can`t find any way of doing it other way without blocking the UI thread.
Any suggestions? Thanks!
--- Edit ----
What I'm doing right now is waiting on all my WaitHandles in the Presenter with this loop:
while (!WaitHandles.All(h => h.WaitOne(1)))
Application.DoEvents();
It feels a little dirty.. but at least it simulates non blocking the thread. Is this something that for some reason I should not be doing?
Here is an example of the "hide method". Granted, it's not MVP, it's just an example.
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
class Form1 : Form
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
public Form1()
{
Text = "First Form";
Button button;
Controls.Add(button = new Button { Text = "Launch 2nd Form", AutoSize = true, Location = new Point(10, 10) });
button.Click += (s, e) => new Form2 { StartPosition = FormStartPosition.Manual, Location = new Point(Right, Top) }.Show(this);
}
}
class Form2 : Form
{
public Form2()
{
Text = "Second Form";
dirty = true;
}
private bool dirty;
protected override void OnClosing(CancelEventArgs e)
{
DialogResult result;
if (dirty && (result = new ConfirmSaveForm().ShowDialog(this)) != DialogResult.No)
{
if (Owner != null)
Owner.Activate();
Hide();
e.Cancel = true;
SaveAsync(result == DialogResult.Cancel);
}
base.OnClosing(e);
}
protected override void OnClosed(EventArgs e)
{
Trace.WriteLine("Second Form Closed");
base.OnClosed(e);
}
private void SaveAsync(bool fail)
{
SaveAsyncBegin();
var sad = new Action<bool>(PerformAsyncSave);
sad.BeginInvoke(fail, (ar) =>
{
try { sad.EndInvoke(ar); }
catch (Exception ex) { Invoke(new Action<Exception>(SaveAsyncException), ex); return; }
Invoke(new Action(SaveAsyncEnd));
}, null);
}
private void SaveAsyncBegin()
{
// Update UI for save
}
private void PerformAsyncSave(bool fail)
{
Trace.WriteLine("Begin Saving");
Thread.Sleep(1000); // Do some work
if (fail)
{
Trace.WriteLine("Failing Save");
throw new Exception("Save Failed");
}
dirty = false;
}
private void SaveAsyncEnd()
{
Trace.WriteLine("Save Succeeded");
Close();
}
private void SaveAsyncException(Exception ex)
{
Trace.WriteLine("Save Failed");
Show();
MessageBox.Show(this, ex.Message, "Save Failed", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
}
class ConfirmSaveForm : Form
{
public ConfirmSaveForm()
{
Text = "Confirm Save";
FormBorderStyle = FormBorderStyle.FixedDialog;
ControlBox = false;
ClientSize = new Size(480, 50);
StartPosition = FormStartPosition.CenterParent;
Controls.Add(new Button { Text = "Yes, Fail", DialogResult = DialogResult.Cancel, Size = new Size(150, 30), Location = new Point(10, 10) });
Controls.Add(new Button { Text = "Yes, Succeed", DialogResult = DialogResult.Yes, Size = new Size(150, 30), Location = new Point(160, 10) });
Controls.Add(new Button { Text = "No", DialogResult = DialogResult.No, Size = new Size(150, 30), Location = new Point(320, 10) });
AcceptButton = Controls[0] as IButtonControl;
}
}