I'm trying to do a spell check of the Russian language in WinFormApp when entering a text field, but nothing comes out, tell me how to get out of the situation, what are your ideas? What is missing, maybe a dictionary, how to connect it and where is it stored?
public void richTextBox1_TextChanged(object sender, EventArgs e)
{
System.Windows.Forms.Integration.ElementHost elementHost1 = new System.Windows.Forms.Integration.ElementHost();
System.Windows.Controls.TextBox richTextBox1 = new System.Windows.Controls.TextBox();
richTextBox1.SpellCheck.IsEnabled = true;
richTextBox1.Language = XmlLanguage.GetLanguage("ru-RU");
elementHost1.Child = richTextBox1;
}
Related
I add a VideoCaptureElement to a window in runtime but when I run this code it fires MediaFailed. But if I add the same element in XAML then it works fine, I can see the video from the laptop camera.
Am I doing anything wrong? Please help!
public partial class MainWindow : Window
{
WPFMediaKit.DirectShow.Controls.VideoCaptureElement VCE;
public MainWindow()
{
InitializeComponent();
VCE = new WPFMediaKit.DirectShow.Controls.VideoCaptureElement();
Content = VCE;
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
VCE.MediaOpened += VCE_MediaOpened;
VCE.MediaFailed += VCE_MediaFailed;
VCE.VideoCaptureDevice = WPFMediaKit.DirectShow.Controls.MultimediaUtil.VideoInputDevices[0]; // This is my laptop webcam
}
void VCE_MediaOpened(Object sender, RoutedEventArgs e) { ... }
void VCE_MediaFailed(object sender, WPFMediaKit.DirectShow.MediaPlayers.MediaFailedEventArgs e) { ... }
}
I had a similar problem with a MediaUriElement working in XAML but not working when instantiated in code-behind.
The solution for me was to Init the control:
VCE.BeginInit();
VCE.EndInit();
This would fit between instantiating (VCE = new...) and assigning (Content = VCE). I haven't tested your particular scenario, but it sounds like the same cause - there must be some extra work done in Init that happens automatically when using XAML.
as seen in this post, I need to interact with the button, I mean, save the value of the repository when the user press the OK button, any suggest?
You need to find your TimeSpanEdit control inside of the popup form. You can iterate through popupForm.Controls collection to find out the control with TimeSpanEdit type. Here is example of how to do it. After that you can use TimeSpanEdit.TimeSpan property to get the value of TimeSpanEdit control.
private void OkButton_Click(object sender, EventArgs e)
{
var popupForm = (TimeSpanEditDropDownForm)OwnedForms.FirstOrDefault(item => item is TimeSpanEditDropDownForm);
if (popupForm == null)
return;
var timeSpanEdit = GetAll(this, typeof(TimeSpanEdit)).FirstOrDefault();
if (timeSpanEdit == null)
return;
MessageBox.Show(timeSpanEdit.TimeSpan.ToString());
}
public IEnumerable<Control> GetAll(Control control,Type type)
{
var controls = control.Controls.Cast<Control>();
return controls.SelectMany(ctrl => GetAll(ctrl,type))
.Concat(controls)
.Where(c => c.GetType() == type);
}
I think you can use object sender. sender will contains probably TimeSpanEditDropDownForm and there you should get actual value of this form. :)
I presume this code is called from controller is it?
if it is true than you have View.CurrentObject and you must know which property uses this TimeSpanEditDropDownForm so you could do something like this.
private void OkButton_Click(object sender, EventArgs e)
{
MyClass myClass = View.CUrrentObject as MyClass;
TimeSpanEditDropDownForm timeSpanForm = sender as TimeSpanEditDropDownForm;
myClass.CurrentTime = timeSpanForm.CurrentTime;
myClass.Session.CommitChanges();
MessageBox.Show("Ok");
}
I dont know what is name of right attribute wich store TimeSpan inside TimeSpanEditDropDownForm thats thing you must find out but I think it could helps :)
I'm working on a WPF project which includes update/delete/insert operation on many tables. For simplicity, I use a datagrid for each table. The users can operate on these tables directly. Once done, click a button, the tables in database get updated. Twoway bind is perfect in this case. Below code seems working fine.
However, one thing I do not like is: the _DBConnection is always open. It is closed until the form exists. Usually, I always open connection whenever I need to, use it, close it immediately.
So, my question is: is below code the correct way to do the twoway bind?
thanks
public partial class MainWindow : Window
{
private OleDbConnection _DBConnection;
private OleDbDataAdapter _DataAdapterAdmin;
private DataSet _DataSetAdmin;
public MainWindow()
{
InitializeComponent();
}
private void InitAdminGrid()
{
string cmd = "SELECT * FROM Admin ORDER BY LastName";
_DataAdapterAdmin = new OleDbDataAdapter(cmd, _DBConnection);
_DataSetAdmin = new DataSet();
_DataAdapterAdmin.Fill(_DataSetAdmin);
dgAdministration.BeginInit();
dgAdministration.DataContext = _DataSetAdmin.Tables[0];
dgAdministration.Items.Refresh();
dgAdministration.EndInit();
}
private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
string connectionString = clsDataAccess.GetConnectionString();
_DBConnection = new OleDbConnection(connectionString);
_DBConnection.Open();
InitAdminGrid();
}
private void btnStart_Click(object sender, RoutedEventArgs e)
{
try
{
OleDbCommandBuilder cmd = new OleDbCommandBuilder(_DataAdapterAdmin);
_DataAdapterAdmin.Update(_DataSetAdmin);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Exception", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
private void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (_DBConnection != null)
{
_DBConnection.Close();
_DBConnection.Dispose();
}
}
}
How to create a simple WPF Authentication for WPF application?
For example:
First time a user should registry then login.
Users login and password should be saved as txt file(encrypted).
If process of authentication is successful,then it should redirect to another existed window.
I'm a beginner in WPF.
I've searched about this question,but didn't find what I need.
I need a simple,step by step explanation of how to do it.
Thanks in advance! :)
I am also learning so in order to exercise a bit i have created a very simple example for you. It is probably unprofessional and unsafe but i think (hope) it is possible to extend it somehow :).
Firstly you need to create simple WPF windows (use txt/btn+Name naming convention):
For both windows add
using System.IO;
Then you need to add events for buttons and modify code for both windows:
public partial class LoginWindow : Window
{
public LoginWindow()
{
InitializeComponent();
}
// This is really bad/weak encryption method
String WeakDecryptMethod(String textIn)
{
Char[] temp = textIn.ToArray<Char>();
for (int i = 0; i < textIn.Length; i++)
{
temp[i] = (char)((int)temp[i] - 3);
}
return new String(temp);
}
private void btnRegister_Click(object sender, RoutedEventArgs e)
{
RegisterWindow newWindow = new RegisterWindow();
newWindow.ShowDialog();
}
private void btnOK_Click(object sender, RoutedEventArgs e)
{
// If file exist and login and password are "correct"
if (File.Exists("Users.txt")
&& txtLogin.Text.Length >= 4
&& txtPass.Text.Length >= 4)
{
using (StreamReader streamReader = new StreamReader("Users.txt"))
{
// While there is something in streamReader read it
while (streamReader.Peek() >= 0)
{
String decryptedLogin = WeakDecryptMethod(streamReader.ReadLine());
String decryptedPass = WeakDecryptMethod(streamReader.ReadLine());
if (decryptedLogin == txtLogin.Text && decryptedPass == txtPass.Text)
{
ProtectedWindow protectedWindow = new ProtectedWindow();
this.Close();
protectedWindow.Show();
break;
}
}
}
}
}
private void btnCancel_Click(object sender, RoutedEventArgs e)
{
this.Close();
}
}
And code for Register window:
public partial class RegisterWindow : Window
{
public RegisterWindow()
{
InitializeComponent();
}
// This is really bad/weak method to encrypt files
String WeakEncryptMethod(String textIn)
{
Char[] temp = textIn.ToArray<Char>();
for (int i = 0; i < textIn.Length; i++)
{
temp[i] = (char)((int)temp[i] + 3);
}
return new String(temp);
}
private void btnRegister_Click(object sender, RoutedEventArgs e)
{
// If file exist and login and password are "correct"
if (File.Exists("Users.txt")
&& txtLogin.Text.Length >= 4
&& txtPass.Text.Length >= 4
&& txtPass.Text == txtPassCheck.Text)
{
StringBuilder stringBuilder = new StringBuilder();
using (StreamReader streamReader = new StreamReader("Users.txt"))
{
stringBuilder.Append(streamReader.ReadToEnd());
}
using (StreamWriter streamWriter = new StreamWriter("Users.txt"))
{
streamWriter.Write(stringBuilder.ToString());
streamWriter.WriteLine(WeakEncryptMethod(txtLogin.Text));
streamWriter.WriteLine(WeakEncryptMethod(txtPass.Text));
}
this.Close();
}
}
private void btnCancel_Click(object sender, RoutedEventArgs e)
{
this.Close();
}
}
In order to work application need to have access to file "Users.txt" which needs to be placed in the same folder.
Notes:
It will be better if you will use some proper encryption functions and probably create separate class for it. Additionally i am almost sure that it will not work properly with login and password which contains the last 3 characters from the end of ASCII tables.
In my opinion it is a bad idea to store login and password data in *.txt file :).
As far i know C# code is very easily reverse engineered so probably it will be better to hide encryption/decryption part somehow. I do not know much about it, but u will be able to read more [here] 2 and probably uncle Google will be able to help.
Code is very simple and there is probably a lot of possibilities to extend it (more file handling stuff, TextBox validation for proper input and password strength calculations)
In this case when user click some UIElement I want this element yo be surrounded by dashed border. If there is some other object surrounded then this code removes it first.
Everything is fine but "private void activateElem" fires twice and I have no idea why. Maybe somebody can help, I really have no more ideas.
Anybody knows some ideas to debug issues like this? Maybe there is some way to print out all events queue. There is silverlight spy but I think it doesn't work for windows phone 7.
My code:
public class ManipulationEngine
{
private Canvas sheet;
private static FrameworkElement current_active_element;
public ManipulationEngine(Canvas sheet)
{
this.sheet = sheet;
foreach (FrameworkElement elem in sheet.Children)
{
elem.MouseLeftButtonUp += new MouseButtonEventHandler(activateElem);
}
}
private void activateElem(object sender, MouseButtonEventArgs e)
{
FrameworkElement elem = sender as FrameworkElement;
if (current_active_element != null)
{
desactivateElem();
}
Grid grid = new Grid();
Rectangle recentagle = new Rectangle();
grid.SetValue(Canvas.TopProperty, (double)elem.GetValue(Canvas.TopProperty) - 10);
grid.SetValue(Canvas.LeftProperty, (double)elem.GetValue(Canvas.LeftProperty) - 10);
DoubleCollection stroke = new DoubleCollection();
stroke.Add(4);
stroke.Add(2);
recentagle.StrokeDashArray = stroke;
grid.Children.Add(recentagle);
sheet.Children.Remove(elem);
elem.Margin = new Thickness(10);
grid.Children.Add(elem);
sheet.Children.Add(grid);
current_active_element = elem;
}
private void desactivateElem()
{
if (current_active_element != null)
{
Grid grid = VisualTreeHelper.GetParent(current_active_element) as Grid;
grid.Children.Remove(current_active_element);
sheet.Children.Remove(grid);
current_active_element.SetValue(Canvas.TopProperty, (double)grid.GetValue(Canvas.TopProperty) + 10);
current_active_element.SetValue(Canvas.LeftProperty, (double)grid.GetValue(Canvas.LeftProperty) + 10);
current_active_element.Margin = new Thickness(0);
sheet.Children.Add(current_active_element);
current_active_element = null;
}
}
I'd really advise looking into the Parts and States model. You may be able to do this with a button, or perhaps a radio button.
Usually if you're coding changes to the visual tree, you're not doing it right.
Karen Corby dealt with this very clearly at MIX08, take a look!
http://archive.visitmix.com/blogs/2008Sessions/T20/
Luke