event-handling

问题 Here, I have two side-by-side panel the first_pnl and second_pnl , the second panel is not visible by default. Initial thoughts of what I need: If my cursor is over the the first one ( MouseEnter ) It's BackColor would change to Black Second panel would be visible If my cursor leaves first one ( MouseLeave ) It's BackColor would change back to Gray Second panel would not be visible Which is simple as: Private Sub PanelMouseEnter(sender As Object, e As EventArgs) _ Handles first_pnl.MouseEnter

问题 i am working on application in WP7 , i would like to pass a list box as parameter to client_DownloadStringCompleted method. My code looks like below , WebClient client = new WebClient(); client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted); 回答1: Just add this line to your code: client.DownloadStringAsync(yourUri, yourListBox); 来源： https://stackoverflow.com/questions/4048371/passing-parameter-to-downloadstringcompletedeventhandler-in-c-sharp

问题 We have an old 32-bit Visual Studio C# Windows Forms solution, which we want to compile from now on, in 64-bit. Unfortunately, our application uses some external dll-s (for scanners, cameras and so on) which are available only in 32-bit version. Accessing 32-bit DLLs from 64-bit code isn't straightforward, especially, when we want to handle also the events raised by those dll-s. Our knowledge at this area is unsufficient for creating an implementation based on this article, so we are looking

问题 I am working with a simple Text to Speech application using the System.Speech.Synthesis reference. I would like to add a slider control to the application and control the volume of the speech with it. In order to set the volume I'm using: speech.Volume = 100; Do I need to use some kind of event handler in order to update this value? By the way I'm creating this as a WPF application with C# (please not VB.NET code). 回答1: <Slider Ticks="1, 2, 3, 4, 5, 6, 7, 8, 9, 10" Value="1" Delay="100"

问题 Well the thing is I'm working on a IDateEditor interface implementation from JCalendar library and I've noticed that Component.firePropertyChange(String propertyName, Object oldValue, Object newValue) method is not public but protected. The situation is illustrated below: public class DateFormattedTextField implements IDateEditor { private JFormattedTextField editor; private DateUtil dateUtil; ... @Override public void setDate(Date date) { Date oldDate = (Date)editor.getValue(); if(dateUtil

问题 Well the thing is I'm working on a IDateEditor interface implementation from JCalendar library and I've noticed that Component.firePropertyChange(String propertyName, Object oldValue, Object newValue) method is not public but protected. The situation is illustrated below: public class DateFormattedTextField implements IDateEditor { private JFormattedTextField editor; private DateUtil dateUtil; ... @Override public void setDate(Date date) { Date oldDate = (Date)editor.getValue(); if(dateUtil

问题 <select id="target"> <option value="1">item1</option> <option value="2">item2</option> <option value="3">item3</option> </select> Say,I want to do some processing according to selected value. 回答1: $('#target').change( function() { $(this).find(":selected").each(function () { console.log( $(this).val() ); }); }); 回答2: $("#target").change( function() { alert($("#target option:selected").val()); }); You may also need to consider this as well if the person does not change the option, but simply

问题 I am having problems with a requirement on one of my projects at work. What I am doing is binding a datatable to a DataGridView(DGV)'s datasource. I then loop through the DataGridView and check if the cell as either 1 * or 2 ** in its value and format those cells with a tooltip and a red background. If I use a button event to trigger this everything works perfectly fine. But if I want this to occur automatically when the form loads using the DataBindingComplete event it does not work

问题 When I comment out the fm.OnLoaded line below, it gives me an error that OnLoaded is null. How can I make it optional for the caller of my class to consume the event or not as with .NET classes / events? using System; using System.Windows; namespace TestEventLoaded8282 { public partial class Window1 : Window { public Window1() { InitializeComponent(); FileManager fm = new FileManager(); //fm.OnLoaded += new FileManager.LoadedHandler(fm_OnLoaded); fm.Load(); } void fm_OnLoaded(object obj,

问题 When I comment out the fm.OnLoaded line below, it gives me an error that OnLoaded is null. How can I make it optional for the caller of my class to consume the event or not as with .NET classes / events? using System; using System.Windows; namespace TestEventLoaded8282 { public partial class Window1 : Window { public Window1() { InitializeComponent(); FileManager fm = new FileManager(); //fm.OnLoaded += new FileManager.LoadedHandler(fm_OnLoaded); fm.Load(); } void fm_OnLoaded(object obj,