In silver light, i am trying to bind the data to datagrid, using linq and wcf service. But it is not binding. This is my code
wcf service:
public class Sasi
{
[OperationContract]
public List<Emp> GetEmp()
{
sasiDataContext edc = new sasiDataContext();
return edc.Emps.ToList();
}
}
Silverlight .xaml
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
SR.SasiClient client = new SR.SasiClient();
client.GetEmpCompleted += new EventHandler<SR.GetEmpCompletedEventArgs>(client_GetEmpCompleted);
client.GetEmpAsync();
}
void client_GetEmpCompleted(object sender, SR.GetEmpCompletedEventArgs e)
{
dgrdEmp.ItemsSource = e.Result;
}
}
This is my code but it is not binding data.
Related
I have 3 buttons on one usercontrol (usercontrol1.xaml) in the Window . Now on-click of button 1 ,I want to switch the view to another usercontrol (usercontrol2.xaml), which again have 3 buttons and so on.
How to implement in MVVM Pattern in WPF?
Be aware that im using caliburn micro for this example
private IEventAggregator _eventAggregator => IoC.Get<IEventAggregator>(key: nameof(EventAggregator));
private IWindowManager _windowManager => IoC.Get<IWindowManager>(key: nameof(WindowManager));
public ShellViewModel(IEventAggregator eventAggregator)
{
_eventAggregator.Subscribe(this);
}
public string _firstName;
// public ShellViewModel page = new ShellViewModel();
public string FirstName
{
get {
return _firstName;
}
set
{
_firstName = value;
NotifyOfPropertyChange(() => FirstName);
}
}
public ICommand ConvertTextCommand
{
get { return new DelegateCommand(ConvertText); }
}
void ConvertText()
{
//string url = "https://www.google.com/";
string url = FirstName;
string result;
using (HttpClient client = new HttpClient())
{
using (HttpResponseMessage response = client.GetAsync(url).Result)
{
using (HttpContent content = response.Content)
{
result = content.ReadAsStringAsync().Result;
}
}
}
//(MainWindow)Application.Current.MainWindow).txtForm1TextBox.Text = "Some text";
//Application.Current.Resources.Add("PageSource", result);
// NavigationService.NavigateToViewModel<SecondViewModel>("Hello");
_windowManager.ShowWindow(new PageSourceViewModel(_eventAggregator), null);
_eventAggregator.PublishOnUIThread(result);
}
You can check caliburn micro and see that you can just create a new view model in a window manager instance
here is also 2 links to 2 tutorials that helped me solve this issue for MVVM
https://www.youtube.com/watch?v=laPFq3Fhs8k
https://www.youtube.com/watch?v=9kGcE9thwNw&list=LLy8ROdSzpPJnikdZQ1XPZkQ&index=30&t=0s
the first tutorial will help you to get a general idea. The second will help you with events and you can look back to my code and see how i handled a new window instance.
You can also call the same view model for a new instance of the same window like you said in the question
You will also need to make a boostrapper class. For my example i did it like this.
public class Bootstrapper : BootstrapperBase
{
private readonly SimpleContainer _container =
new SimpleContainer();
public Bootstrapper()
{
Initialize();
}
protected override void Configure()
{
_container.Instance<IWindowManager>(new WindowManager());
_container.Singleton<IEventAggregator, EventAggregator>();
_container.PerRequest<ShellViewModel>();
}
protected override void OnStartup(object sender, StartupEventArgs e)
{
_container.Instance<SimpleContainer>(_container);
_container.Singleton<IWindowManager, WindowManager>(key: nameof(WindowManager))
.Singleton<IEventAggregator, EventAggregator>(key: nameof(EventAggregator));
DisplayRootViewFor<ShellViewModel>();
}
protected override object GetInstance(Type service, string key)
{
return _container.GetInstance(service, key);
}
protected override IEnumerable<object> GetAllInstances(Type service)
{
return _container.GetAllInstances(service);
}
protected override void BuildUp(object instance)
{
_container.BuildUp(instance);
}
}
I am using visual studio 2012 (windows form application) and I have two forms, one with a label and the other with a button. I want it so that when you click the button the label on the other form goes up by one. I already have:
Label1 = Label1 + 1
I just need to know how to make the connection with the two forms. Maybe call a function?
Btw I am new to the program and script so in simple terms plz.
Here is a sample I create for you. Add Fomr2 Like this:
public partial class Form2 : Form
{
private void button1_Click(object sender, EventArgs e)
{
Form1.Instance.Controls.Find("label1", true).First().Text = "Some thing";
}
}
And Form1:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
_Instance = this;
}
private static Form1 _Instance;
public static Form1 Instance
{
get { return _Instance; }
set { Instance = value; }
}
private void button1_Click(object sender, EventArgs e)
{
new Form2().Show();
}
I develop a WPF app for mjpg streaming. I include the code here
public partial class MainWindow : Window
{
MjpegDecoder _mjpeg;
public MainWindow()
{
InitializeComponent();
_mjpeg = new MjpegDecoder();
_mjpeg.FrameReady += _mjpeg_FrameReady;
}
void _mjpeg_FrameReady(object sender, FrameReadyEventArgs e)
{
// What to write to get BitmapImage
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
_mjpeg.ParseStream(new Uri("http://155.41.145.37/mjpg/video.mjpg"));
}
}
What I need to write to get the bitmap from the frameReadyEventArgs and how to assign that bitmap to a WPF Image control
I've never used MJPEG Decoder library but if you go to their WPF example you'll find this:
private void mjpeg_FrameReady(object sender, FrameReadyEventArgs e)
{
image.Source = e.BitmapImage;
}
FrameReadyEventArgs should already have BitmapImage
public class FrameReadyEventArgs : EventArgs
{
...
public BitmapImage BitmapImage;
}
I have Silverlight application i want to show login window before main page InitializeComponent();
this method does not works:
public MainPage()
{
Login log = new Login();
log.Show();
InitializeComponent();
}
Any advice?
Try this:
public MainPage()
{
InitializeComponent();
Loaded += MainPage_Loaded;
}
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
Visibility = Visibility.Collapsed;
Login log = new Login();
log.Show();
}
I am trying to find the right way to get the data from a ChildWindow/popup using a MVVM pattern in Silverlight (3). For example: I have a main page with a data entry form and I want to open a popup with a list of customers. When user selects a customer I want to transfer selected customer into the main page. This is what the (example) code which I am using at the moment:
Main page
public partial class MainPage : UserControl
{
public MainPageViewModel ViewModel { get; private set; }
public MainPage()
{
InitializeComponent();
ViewModel = new MainPageViewModel();
DataContext = ViewModel;
}
private void SearchCustomer_Click(object sender, RoutedEventArgs e)
{
ViewModel.SearchCustomer();
}
}
public class MainPageViewModel: ViewModel
{
private string customer;
public string Customer
{
get { return customer; }
set { customer = value; RaisePropertyChanged("Customer"); }
}
public void SearchCustomer()
{
// Called from a view
SearchWindow searchWindow = new SearchWindow();
searchWindow.Closed += (sender, e) =>
{
if ((bool)searchWindow.DialogResult)
{
Customer = searchWindow.ViewModel.SelectedCustomer.ToString();
}
};
searchWindow.Show();
}
}
Child window
public partial class SearchWindow : ChildWindow
{
public SearchWindowViewModel ViewModel { get; private set; }
public SearchWindow()
{
InitializeComponent();
ViewModel = new SearchWindowViewModel();
DataContext = ViewModel;
}
private void OKButton_Click(object sender, RoutedEventArgs e)
{
DialogResult = ViewModel.OkButtonClick();
}
private void CancelButton_Click(object sender, RoutedEventArgs e)
{
DialogResult = ViewModel.CancelButtonClick();
}
}
public class SearchWindowViewModel: ViewModel
{
private Customer selectedCustomer;
private ObservableCollection<Customer> customers;
public ObservableCollection<Customer> Customers
{
get { return customers; }
set {customers = value; RaisePropertyChanged("Customers"); }
}
public Customer SelectedCustomer
{
get { return selectedCustomer; }
set { selectedCustomer = value; RaisePropertyChanged("SelectedCustomer"); }
}
public SearchWindowViewModel()
{
Customers = new ObservableCollection<Customer>();
ISearchService searchService = new FakeSearchService();
foreach (Customer customer in searchService.FindCustomers("dummy"))
Customers.Add(customer);
}
public bool? OkButtonClick()
{
if (SelectedCustomer != null)
return true;
else
return null; // show some error message before that
}
public bool? CancelButtonClick()
{
return false;
}
}
Is this the right way or is there anything more "simple"?
Cheers,
Rok
More problematic here is the use of View specific terms and types in your VMs. Click events, DialogResults should not be anywhere near your ViewModels.
With regards to the question, I had a similiar question about this here:
Handling Dialogs in WPF with MVVM
The answer I accepted was the use of the Mediator pattern to get around this. Have a look. :)
A good MVVM library which supports opening child window is Chinch mvvm helper library. You can look at a sample at http://www.codeproject.com/KB/silverlight/SL4FileUploadAnd_SL4_MVVM.aspx.