private void btnBrowserGo_Click(object sender, EventArgs e)
{
browser.Navigate(txtBrowserURL.Text);
}
The code above directs the browser to the URL address in the textbox. I would like this event to also occur if the user presses the ether key when typing the URL. I have this code (below) but don't know how I would call the above code
private void txtBrowserURL_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)13)
{
}
}
You could just call the event directly using:
btnBrowserGo_Click(null, null);
However, it would be better if you didn't handle the navigation in the event itself and just called a method. That way, the method could be directly called from anywhere else in the class. This is especially useful if you have more logic in the method.
void NavigateBrowser()
{
browser.Navigate(txtBrowserURL.Text);
}
Then, from any event, you can just call the method.
private void txtBrowserURL_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)13)
{
NavigateBrowser();
}
}
or
private void btnBrowserGo_Click(object sender, EventArgs e)
{
NavigateBrowser();
}
Try
btnBrowserGo_Click(null, null);
since you don't use last two parameters.
However, it might be good to extract 'logic' into some other method, and use that method from BOTH event handlers.
Your logic here is one-liner, but it might be more...
private void txtBrowserURL_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)13)
{
btnBrowserGo_Click(btnBrowserGo,EventArgs.Empty);
}
}
Related
I would like to call btnSubmit if certain conditions in axTws1_tickPrice are true. How do i do this?
private void btnSubmit_Click(object sender, EventArgs e)
{
//code here
}
private void axTws1_tickPrice(object sender, AxTWSLib._DTwsEvents_tickPriceEvent e)
{
if (Condition)
{
Call butSubmit (how do i do this)
}
}
You're better off having a common method that both of your control handlers call, rather than trying to call one handler from another. That way your code is more extensible and testable, and you don't have to worry about the event arguments or senders.
For example:
private void btnSubmit_Click(object sender, EventArgs e)
{
DoStuff();
}
private void axTws1_tickPrice(object sender, AxTWSLib._DTwsEvents_tickPriceEvent e)
{
if (Condition)
{
DoStuff();
}
}
private void DoStuff()
{
// code to do stuff common to both handlers
}
Multiple options.
Option 1 :
Preferred approach, move common logic to another method.
private void btnSubmit_Click(object sender, EventArgs e)
{
CommonLogic();
}
private void axTws1_tickPrice(object sender, AxTWSLib._DTwsEvents_tickPriceEvent e)
{
if (Condition)
{
CommonLogic();
}
}
private void CommonLogic()
{
// code for common logic
}
Option 2:
Executing PerformClick() method which generates a Click event for a button.
btnSubmit.PerformClick();
Option 3:
Invoke the event method like any other normal method.
btnSubmit_Click(sender, new EventArgs());
just call it with current parameters.
if (Condition)
{
butSubmit(sender, null)
}
Unbelievable, but
btnSubmit_Click(null,null);
Or other arguments if needed.
private void axTws1_tickPrice(object sender, AxTWSLib._DTwsEvents_tickPriceEvent e)
{
if (Condition)
{
button1_Click(sender, EventArgs.Empty);
}
}
button1_Click is similar to a normal method which accepts two inputs of type object and EventArgs So you can call them by giving the same parameters. if you are not going to use these arguments inside the method then you can call them by passing null,null don't use null if you want to use e or sender inside the method. in such situation call them as like i suggested above.
Thanks Steve and Hari - this worked well
private void btnSubmit_Click(object sender, EventArgs e)
{
DoStuff();
}
private void axTws1_tickPrice(object sender, AxTWSLib._DTwsEvents_tickPriceEvent e)
{
if (Condition)
{
DoStuff();
}
}
private void DoStuff()
{
// code to do stuff common to both handlers
}
I have a combobox, if the "Enter" key is pressed will do something. but i want to call this function manually but how i send "ENTER" key as parameter?
private void carga_todos(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)13)
{
do something
}
im trying this:
carga_todos(null, ??????)
Don't call events manually like that.
Move your logic into a separate method, which you can call whenever you like:
private void carga_todos(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)Keys.Enter)
{
DoSomething();
}
}
private void AnotherFunctionThatNeedsToDoSomethingToo()
{
DoSomething();
}
private void DoSomething()
{
// stuff to do
}
I agree with Grant Winney. However, if your requirements are to call the handler directly then the following should work:
KeyPressEventArgs kpea = new KeyPressEventArgs((char)Keys.Enter);
carga_todos(null, kpea);
Good luck
J
I have such piece of code:
private void button1_Click(object sender, EventArgs e) {
// Do something...
}
private void Form1_KeyDown(object sender, KeyEventArgs e) {
if (e.KeyData == Keys.A) {
// Call button1_Click.
}
}
How do I manage to call the Click event? What should I write instead of
// Call button1_Click.
Thank you!
Events are meant to be triggered not called. So you can trigger the event in your Form1_KeyDown event by performing the button click. I mean
private void Form1_KeyDown(object sender, KeyEventArgs e) {
if (e.KeyData == Keys.A) {
button1.PerformClick();
}
}
Since the button click event handler is just a method, you could just do:
private void Form1_KeyDown(object sender, KeyEventArgs e) {
if (e.KeyData == Keys.A) {
button1_Click(this, e);
}
}
However, it's often a better idea to move the logic into a separate method, and call it from both locations. By refactoring the logic within button1_Click into it's own method, you make it clear that you're calling that logic from either set of event handlers.
So I have a form where I want to change the position of a trackbar and trigger the trackbar_scroll event after I click on a label. So far, clicking on the label changed the value of the trackbar, thats easy:
private void label4_Click(object sender, EventArgs e)
{
trackBar1.Value = 0;
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
if (trackBar1.Value == 0)
{
try
{
//code...
}
catch
{
MessageBox.Show("Error occured");
}
}
}
How do I call the trackBar1_scroll(..) event from within the label click?
Try calling it directly. You just have to supply the parameters yourself:
trackBar1_Scroll(trackBar1, EventArgs.Empty);
or simply
trackBar1_Scroll(null, null);
if the parameters are not being utilized.
Another approach you could take, aside from #LarsTech answer (which is absolutely correct), would be to refactor your code to reduce the need to supply empty parameters. Since you're not actually using the EventArgs or referencing the sender directly, given your example above, you could do something like the following:
private void DoSomething(int value)
{
...
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
DoSomething(trackBar1.Value);
}
private void label4_Click(object sender, EventArgs e)
{
DoSomething(...);
}
It always feels like code smell to me, when you call an event handler with empty parameters, simply to execute code which you could otherwise abstract out.
I want to call btnDisconnect_Click within btnExit_Click.
private void btnDisconnect_Click(object sender, EventArgs e)
{
//does something
}
private void btnExit_Click(object sender, EventArgs e)
{
//I want to call btnDisconnect_Click. What line of code should I use here?
}
Usually in cases like these I make my click handlers only call another function and pass in appropriate arguments:
private void btnDisconnect_Click(object sender, EventArgs e)
{
DoDisconnect();
}
private void DoDisconnect()
{
...
}
Then I can call that same function from wherever:
private void btnExit_Click(object sender, EventArgs e)
{
DoDisconnect();
}
This way your "disconnect" logic is gummed up by taking dummy arguments that don't actually affect the disconnect behavior in any way.
It also means you can start factoring out view logic from forms.
That depends on if you are using the arguments passed to the event handlers
You could yust call it using nulls
Something like
private void btnDisconnect_Click(object sender, EventArgs e)
{
//does something
}
private void btnExit_Click(object sender, EventArgs e)
{
//I want to call btnDisconnect_Click. What line of code should I use here?
btnDisconnect_Click(null,null);
}
They're just methods. Just call it. You'll need to provide whatever event arguments btnDisconnect_Click is expecting (which is probably nothing). So the simplest thing is:
private void btnExit_Click(object sender, EventArgs e)
{
btnDisconnect_Click(this, EventArgs.Empty);
}
This will pass the current form/window/whatever it is as the sender, and an EventArgs object with no data.
You can call it just as you have it listed. The this below isn't necessary but it puts context on the code:
private void btnExit_Click(object sender, EventArgs e)
{
//I want to call btnDisconnect_Click. What line of code should I use here?
this.btnDisconnect_Click(null, null);
// If you need to have sender as something you can always put
// this in directly
this.btnDisconnect_Click(this.btnDisconnect, new System.EventArgs());
}
I'm going to make an assumption here and say that what you're trying to do is call a Disconnect (perhaps a network resource) for both the disconnect and exit buttons. Instead of calling one event handler method from the other you may want to refactor the disconnect event handler's code into a separate method. Then call that method from both handlers. For example:
private void Disconnect()
{
//Disconnect here
}
private void btnDisconnect_Click(object sender, EventArgs e)
{
//do some other stuff here
Disconnect();
}
private void btnExit_Click(object sender, EventArgs e)
{
//do some other exit stuff here
Disconnect();
}
This makes your code much cleaner and saves you from having to call one event handler from another. This begins to separate your view logic from the rest of your program's logic, which is much more desirable and much easier to maintain in the long run. For instance you may want a separate controller for handling the network resource, instead of embedding it into the view's logic.
In the simplest case you can just call the btnDiconnect_Click directly as follows:
private void btnDisconnct_Click(Object sender, EventArgs e)
{
//Does Something
}
private void btnExit_Click(Object sender, EventArgs e)
{
//Call btnDisconnect_Click()
btnDisconnect_Click(sender, e);
}
You could just call the method passing in valid parameters.
btnDisconnect_Click(btnDisconnect,new EventArgs());
However you might want to consider refactoring out the code in btnDisconnect into a new method and calling that instead:
private void doSomething()
{
//....
}
private void btnDisconnect_Click(object sender, EventArgs e)
{
doSomething();
}
private void btnExit_Click(object sender, EventArgs e)
{
doSomething();
}
{// this is probably your constructor
.
public delegate void MyCustomHandler(object sender, EventArgs e);
.
MyCustomHandler myCustomHandler = new MyCustomHandler(); //you can do more in your delegates constructor, members etc
myCustomHandler += btnExit_Click;
myCustomHandler += btnDisconnect_Click;
}
private void btnDisconnect_Click(object sender, EventArgs e)
{
// do Something
}
private void btnExit_Click(object sender, EventArgs e)
{
// do Something
}
//And wherever you need to invoke these, you do
myCustomHandler(object sender, EventArgs e);