I have added a DataGridViewCheckBoxColumn in a datagridview and want to commit changes in database on checking and unchecking this checkboxcolumn. Please assist.
Thanks.
try this:
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
}
private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
Debug.WriteLine(dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value);
}
in CellValueChanged Event you can retrieve the changed value only if you called CommitEdit before ...
Related
If I register a class handler like so:
EventManager.RegisterClassHandler(
typeof(ListBoxItem),
DropEvent,
new RoutedEventHandler(OnListBoxItemDropEvent));
The following method signature is expected:
private void OnListBoxItemDropEvent(object sender, RoutedEventArgs e)
The standard Drop method signature is the following:
private void Drop(object sender, DragEventArgs e)
i.e. it gives you access to the DragEventArgs e
Is there a way for me to access the DragEventArgs e when registering a routed event handler?
How about creating a DragEventHandler (instead of a RoutedEventHandler)?:
EventManager.RegisterClassHandler(
typeof(ListBoxItem),
DropEvent,
new DragEventHandler(Drop));
I'm newbie in Silverlight and I need to activate MouseRightButtonDown(object sender, MouseButtonEventArgs e) from an another event handler in my application.
I have found, that in WPF it is possible to do somthing like this:
public void OnContextMenuOpened(object sender, RoutedEventArgs e) {
MouseButtonEventArgs args = new MouseButtonEventArgs(
InputManager.Current.PrimaryMouseDevice,
0,
MouseButton.Right);
MouseRightButtonDown(sender, args);
}
But I have in Silverlight neither InputManager-Class nor MouseButton-Class... It is generally possible to realise something like that?
I want to do it, because I try to select an DataGridRow(within an custom control) with help of right-mouse-button. Without context menu it is easily possible, but when I switch context menu on, then context menu opens and event will not fired...
My code snippet:
public override void OnApplyTemplate() {
DataGrid = (DataGrid)GetTemplateChild("DataGrid");
DataGrid.MouseRightButtonDown += DataGridMouseRightButtonDown;
ContextMenu = (ContextMenu)GetTemplateChild("ContextMenu");
ContextMenu.Opened += OnContextMenuOpened;
}
private void DataGridMouseRightButtonDown(object sender, MouseButtonEventArgs e) {
//My code to select an DataGridRow
}
public void OnContextMenuOpened(object sender, RoutedEventArgs e) {
//This event-handler now will be always activated if I do
//right-mouse-button-click
}
Thanks a lot for help!
The Results of my research has shown, that it is impossible in silverlight -.-
Right now, I'm calling the win32 createcaret/showcaret in the keypress event of my masked textbox. That changes it fine. I want the caret to change when the box is entered, though, either by tab or by click.
Unfortunately the enter event or even the invalidate event aren't suitable places to change that caret. It doesn't change, maybe because they fire too early.
So anyway, how can I get the caret to change on textbox enter without handling it in the enter event?
You need to add DestroyCaret to your routine, too:
private void Form1_Load(object sender, EventArgs e)
{
textBox1.GotFocus += new EventHandler(textBox1_GotFocus);
textBox1.LostFocus += new EventHandler(textBox1_LostFocus);
}
private void textBox1_GotFocus(object sender, EventArgs e)
{
CreateCaret(textBox1.Handle, IntPtr.Zero, 6, textBox1.Height);
ShowCaret(textBox1.Handle);
}
private void textBox1_LostFocus(object sender, EventArgs e)
{
DestroyCaret();
}
I'm having problems getting the Silverlight Button Click event to immediately update a control's UI element and then continue doing some other process. For example, update the text of a control and then do some process. I've tried calling the UpdateLayout() method but that doesn't help.
Here is some sample code:
private void button1_Click(object sender, RoutedEventArgs e)
{
textBlock1.Text = "Testing";
textBlock1.UpdateLayout();
UpdateLayout();
Thread.Sleep(2000);
textBlock1.Text = "Done";
}
In that sample, the textBlock1 control will never display the text "Testing".
It's because you've blocked the UI thread with your Sleep statement which means that the text block won't update until after it's completed, but by that time you've set the text to "Done".
This doesn't work. The UI will block when you do not exit the method. This is why in Silverlight you usually do everything asynchronously:
private void button1_Click(object sender, RoutedEventArgs e)
{
textBlock1.Text = "Testing";
var myTask = /* ... */
myTask.Completed += new FancyDelegate(myTask_Completed);
}
private void myTask_Completed(object sender, RoutetEventArgs e)
{
textBlock1.Text = "Done.";
}
If your tasks do not have asynchronous functions, just wrap them. But be reminded, that when you want to change your textBlock1.Text property from another thread, you must invoke it with the Dispatcher.
Hi I have an application built in wpf.
At the base level I have a usercontrol and on that usercontrol are many components.
I want to be able to capture a key press event on my usercontrol even if the focus is on one of the children. Using PreviewKeyUp doesn't seem to do the trick.
Thanks,
Matt.
Maybe I understood your question not fully, but if you don't set the keydown event to handled, it should go up the hierarchy.
public UserControl1()
{
InitializeComponent();
this.KeyDown += new KeyEventHandler(UserControl1_KeyDown);
textBox1.KeyDown += new KeyEventHandler(textBox1_KeyDown);
}
void textBox1_KeyDown(object sender, KeyEventArgs e)
{
Console.WriteLine("txt keydown: "+e.Key.ToString());
}
void UserControl1_KeyDown(object sender, KeyEventArgs e)
{
Console.WriteLine(e.Key.ToString());
}
output:
txt keydown: Y
Y