I want to show Image on MouseEnter event of button control(I have 6 buttons) ,I can use below code for each button
void button1_MouseEnter(object sender, EventArgs e)
{
this.button1.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.img2));
}
but I Don't want to write it for each buttons enter event ,and hence trying to make it only on method so can use for each button something like this ,but how do I will select different image for different button via this method than ?
void button_MouseLeave(object sender, EventArgs e)
{
var btn = (Button)sender;
this.btn.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.particular image for particular button));
}
You register the same event for all buttons.
For example:
btn1.MouseEnter += genericButton_event;
btn2.MouseEnter += genericButton_event;
You add the image to resources for example using the same name as the button so you can use the btn.Name property. (Something like: btn1.png and btn2.png), and you assign the resource using reflection with the string property "name":
private void genericButton_event(object sender, EventArgs e)
{
var btn = (Button)sender;
btn.BackgroundImage = new Bitmap(System.Reflection.Assembly.GetEntryAssembly().
GetManifestResourceStream("MyProject.Resources" + btn.Name +".png"));
}
You get the bitmap from resources using strings, so you can get the desired background image depending on button name.
You could use the Tag attribute for that. It takes an object - so you can put there whatever you want.
Or you could chose which image to display by naming them after the button and searching for the correctly named image.
Button btn = new Button();
btn.Tag = <YourImage>; // Here you define which image to show
btn.MouseLeave += btn_MouseLeave;
void btn_MouseLeave(object sender, EventArgs e)
{
Button b = (Button)sender;
b.BackGroundImage = (System.Drawing.Image)b.Tag;
}
Of course you'd have to check if the Tag is null.
Related
I'm using a Button in a class. When the button is pressed, it should call a routine with the button's corresponding text. How do I convert the sender into a String_Entry? Also, I'm quite a newbie regarding object oriented/class programming, so comments are welcome.
public class String_Entry
{
public TextBox textbox;
public Button send;
// other stuff
public String_Entry()
{
textbox = new TextBox();
send = new Button();
send.Click += new System.EventHandler(this.bSend_Click);
// put in GUI, set parameters and other stuff
}
// other stuff
private void bSend_Click(object sender, EventArgs e)
{
// Trying to get the corresponding String_Entry from the Button click event
Button cntrl = (Button)sender;
String_Entry entry = (String_Entry)(cntrl.Parent);
parse.ProcessHexLine(entry);
}
}
Your solution of encapsulating a button with a textbox and the event handler is sound. It just goes wrong in the event handler:
private void bSend_Click(object sender, EventArgs e)
{
Button cntrl = (Button)sender;
String_Entry entry = (String_Entry)(cntrl.Parent);
parse.ProcessHexLine(entry);
}
Firstly, there is no point to doing anything with sender as it'll be the same as the field send. Next cntrl.Parent will give you a reference to the Form, or other container object, that contains the button, not this instance of String_Entry. To access that, use this. So you can change the event handler to:
private void bSend_Click(object sender, EventArgs e)
{
parse.ProcessHexLine(this);
}
I'm trying to create a new uri, and I'm trying to use some information from several buttons.
On the XAML i have for example 3 buttons, all the buttons have the same Click="button_clicked"
when that button is clicked i want a piece of information from the button that was clicked i.e. its Content, and use it in a new uri.
private void Button_Click(object sender, RoutedEventArgs e)
{
newurl.findurl = ("http://website.com/" + Content + ".zip");
NavigationService.Navigate(new Uri("/WebPage.xaml", UriKind.Relative));
}
If I use System.Diagnostics.Debug.Writeline(Content); all I get is this System.Windows.Controls.Grid
You can add an arbitrary parameter to most UI Objects by using the .Tag property. For example
Click on the button and check out the Property
Change the Tag to anything you like. If you want to pass an object it can be done as well
Button b = new Button();
b.Tag = your_object;
Now in your Button_Click event
private void Button_Click(object sender, RoutedEventArgs e)
{
// get the button
Button b = sender as Button;
object your_object = b.Tag;
}
I have 70 buttons whose names are like button1, button2, button3 and so on.
My aim is that whenever button1 is clicked, it will say "1", button2 will say as "2" and so on for the others.
The code for button1 to speak is:
SpeechSynthesizer synthesizer = new SpeechSynthesizer();
private void button1_Click(object sender, EventArgs e)
{
synthesizer.Speak("1");
}
For button2
private void button2_Click(object sender, EventArgs e)
{
synthesizer.Speak("2");
}
and so on for other 68 buttons.
Now it is difficult to implement the 70 button's actions. These button actions follow a pattern - so can anyone suggest a more efficient way I can implement these button handlers to save me writing out 70 different actions?
Try something like this
button1.Tag = "1";
button2.Tag = "2";
...
private void button_Click(object sender, EventArgs e)
{
synthesizer.Speak(((Button)sender).Tag.ToString());
}
Use same handler for all buttons. Sender of event will be the button which raised event. You can get it's name and extract text to say:
private void button_Click(object sender, EventArgs e)
{
Button button = (Button)sender;
string text = button.Name.Substring("button".Length);
synthesizer.Speak(text);
}
Create a single handler for all of the buttons.
Cast the sender parameter to get the Button instance that was clicked, and figure out what to do based on its Name, Text, or Tag.
Depending on your UI, you might want to generate all of those buttons in a loop, too.
You can subscribe them to a single eventhandler.
thus:
button1.Click += buttonClicked;
button2.Click += buttonClicked;
// and so on
and the code for the buttonClicked;
private void buttonClicked(object sender, EventArgs e)
{
//This will get the Type first, the name and then the last character on the Name
synthesizer.Speak(sender.GetType().Name.Substring(sender.GetType().Name.Length - 1, 1));
}
this promotes code reuse for you :)
I want to get the text of the button whenever I click on it.
The algorithm that I made is where i have a function that is a loop that creates a number of buttons and assigns numbers:
void ListAllPage()
{
if (pageMax < 50)
{
//if page max less than 50
for (int i = 0; i < pageMax; i++)
{
Button newBtn = new Button();
newBtn.Text = i.ToString();
newBtn.Width = 50;
newBtn.Click += page_Clicked;
pageCell.Controls.Add(newBtn);
}
}
}
Now buttons will appear on the screen, their events will be triggered and the function page_Click; will be executed:
public void page_Clicked(object sender, EventArgs e)
{
//inside this function I want to obtain the button number that was clicked by the user. How do I do that?
}
Take note, I must all the functions that I described here,...
My thinking is to feed all the buttons that i created inside the loop to a dictionary..
Dictionary.. it will take variables like this btndic.Add(Button b=new Button,b.text);
But the issue is how to retrieve the buttons,,,
if there is a better way, i would like to hear about it...
instead of using the Click Event -> Use the Command Event: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.oncommand.aspx then you can distinguish which button has been clicked
You just need to cast the sender object to a Button, or more generally, a Control:
public void page_Clicked(object sender, EventArgs e)
{
Control c = sender as Control;
MessageBox.Show("Clicked on " + c.Text);
}
Also, it might be more appropriate to use the Tag property to store your custom information (number). In that case, Text property can be anything you like.
Try this way
public void page_Clicked(object sender, EventArgs e)
{
Button btn=(Button)sender;
}
in your ListAllPage method assign Tag to each button:
newBtn.Tag = i;
In your handler you can obtain button instance from sender:
var clickedButton = (Button)sender;
int pageIndex = (int)clickedButton.Tag;
I am creating 7 buttons on the fly
when i create the buttons i am trying to have an event handler than can deal with all clicks in one method via a switch. Ideally i want to pass an id with the button that indicates what was clicked, opposed to this solution of
void pdfButton_Click(object sender, EventArgs e)
{
Button b = (Button)sender;
Console.WriteLine(b.Text);
}
as all of the buttons using this event handler have the same text. I have a unique id associated witht the buttons but no idea how to send them
thanks
You can use the Name or Tag properties.
Put the ID in the Tag property on the button when you create them and then check the ID in your event handler.
Button button = new Button();
button.Tag = 1;
...
void pdfButton_Click(object sender, EventArgs e)
{
Button b = (Button)sender;
switch ((int)b.Tag)
{
...
}
}
First: Bad practice to handle several clicks in one event via switch. But however a solution would be:
Create your own control which inherits the button and ad your ID as an property. So you can access it via:
MyButton b = (MyButton)sender;
switch(b.ID) {
//Code goes here
}
If each button you add has a unique Id, why not just use the ID property of the button?
Button button = new Button();
button.ID= "Button1";
//...
void pdfButton_Click(object sender, EventArgs e)
{
Button b = (Button)sender;
switch(button.ID)
{
case "Button1":
//...
}
}