What is Dependency Dependency means an object depending upon another object. An object O1 depends upon another object O2 when O1 is using O2’s property to do some changes in its own(O1) property. Why we need it To achieve these changes, some notification logic is needed of-course. Before WPF or similar technology, we were doing … Read more
WPF is a computer-software graphical subsystem for rendering user interfaces in Windows-based application. WCF is a set of APIs in the .NET Framework for building connected, service-oriented applications. There is a cool blog post about how you can implement a WCF service and then consume it using a WPF client. 2 solved How i can … Read more
What I am doing here is getting all the child controls of the wrap panel assuming that you only have buttons on your wrap panel. I then generate random numbers between 0 and the total count of the children and then raising the event. (I am currently editing and formatting my answer) XAML: <WrapPanel Name=”wrapPanel”> … Read more
using SelectedValue and SelectedValuePath. The TreeViewItem child and parent must have the same Uid. <Window x:Class=”WpfApp1.MainWindow” xmlns=”http://schemas.microsoft.com/winfx/2006/xaml/presentation” xmlns:x=”http://schemas.microsoft.com/winfx/2006/xaml”> <StackPanel> <TreeView x:Name=”treeView” Height=”200″ SelectedValuePath=”Uid”> <TreeViewItem Header=”Letters-1″ x:Name=”tab1″ Uid=”Letters-1″> <TreeViewItem Header=”a” Uid=”Letters-1″/> <TreeViewItem Header=”b” Uid=”Letters-1″/> <TreeViewItem Header=”c” Uid=”Letters-1″/> </TreeViewItem> <TreeViewItem Header=”Letters-2″ x:Name=”tab2″ Uid=”Letters-2″> <TreeViewItem Header=”d” Uid=”Letters-2″/> <TreeViewItem Header=”e” Uid=”Letters-2″/> <TreeViewItem Header=”f” Uid=”Letters-2″/> </TreeViewItem> <TreeViewItem Header=”Letters-3″ x:Name=”tab3″ Uid=”Letters-3″> … Read more
Rather than using SelectedIndex, have you tried using SelectedItem or SelectedValue? If the DataGrid‘s ItemSource is set to your ObservableCollection, then those properties should point directly to the selected contained object. solved Accessing items in ObservableCollection bound to WPF DataGrid
A MS SQL Server database, by default, only has a single schema (dbo). You can add schemas to group things for either security or organizational purposes. In your case, the schema apbd was created and Student was created on that schema not the dbo schema. So, to reference that table, you need to use [apbd].[Student]. … Read more
The Binding in the UserControl’s XAML should have the UserControl instance as its source object, e.g. like this: <ListView ItemsSource=”{Binding MessageList, RelativeSource={RelativeSource AncestorType=UserControl}}” /> Alternatively you could set x:Name on the UserControl and use an ElementName binding: <UserControl … x:Name=”self”> … <ListView ItemsSource=”{Binding MessageList, ElementName=self}” /> … </UserControl> Besides that you should usually not set … Read more
Save the prior value and then reset it to the prior. int lastIndex = -1; if (q) { lastIndex = (ListView)Sender.SelectedIndex; } else { // Stop change from happening (ListView)Sender.SelectedIndex = lastIndex; } 2 solved How can I prevent a ListView option from changing? [closed]
The code you are writing in the Offnen.cs file isn’t doing anything with the file because the variable “mp” is local to the object o (Offnen). Perhaps something like this is what you are looking for: MainWindow.xaml.cs #region Öffnen der Datei private void menuOffnen_Click(object sender, RoutedEventArgs e) { mp.Pause(); Offnen o = new Offnen(); o.OffnenDerDatei(mp); … Read more
Create a custom control such as: public class CrazyCombo : ComboBox { static CrazyCombo() { DefaultStyleKeyProperty.OverrideMetadata(typeof(CrazyCombo), new FrameworkPropertyMetadata(typeof(CrazyCombo))); } public int InitialDisplayItem { get { return (int)GetValue(InitialDisplayItemProperty); } set { SetValue(InitialDisplayItemProperty, value); } } // Using a DependencyProperty as the backing store for InitialDisplayItem. This enables animation, styling, binding, etc… public static readonly DependencyProperty InitialDisplayItemProperty … Read more
What are you trying to do looks dangerous to me. Try to understand what those classes are for and ask some advice from a colleague. He will definitely help you on that. You will not find an answer here because your situation is too specific and we have no sample code. Also, some OOP lecture … Read more
It sounds like you haven’t assigned your DataContext. Below is a brief example. Assuming your custom class looks something like this: CODE: public class Foo { private ObservableCollection<string> _names; public ObservableCollection<string> Names { get{ return _names;} set { _names = value; } } } and your XAML looks like XAML: <ListBox Name=”lstNames” ItemsSource=”{Binding Names}”/> Set … Read more
try this one source [DllImport(“user32.dll”, EntryPoint = “FindWindowEx”)] public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow); [DllImport(“User32.dll”)] public static extern int SendMessage(IntPtr hWnd, int uMsg, int wParam, string lParam); private void button1_Click(object sender, EventArgs e) { Process [] notepads=Process.GetProcessesByName(“notepad”); if(notepads.Length==0)return; if (notepads[0] != null) { IntPtr child= FindWindowEx(notepads[0].MainWindowHandle, new IntPtr(0), “Edit”, … Read more
<DataGridTextColumn Header=”Name” Binding=”{Binding Path=Name,Mode=TwoWay}” /> DataGridTextColumn takes a CellContent instance and calls ToString() to display it. It displays Value, but without .Value in the path edits in datagrid cells are not applied. <DataTrigger Binding=”{Binding IsTrend}” Value=”True” > DataTrigger takes a CellContent instance and calls Equals() with parameter “True”. But CellContent object is not equal to … Read more
ComboBoxItem is a FrameworkElement which cannot belong to multiple parents. When you use string collection, each ComboBox generate a new ComboBoxItem for the same string. When collection contains ComboBoxItems, comboBoxes don’t create other ComboBoxItems and reuse existing, stealing them from each other. Additionally when you follow MVVM approach, you should not have ComboBoxItem objects in … Read more