My problem is whenever I double click on an object (e.g picturebox), it enters another window where I can do my coding (which is normal) however, it starts with:
private void pictureBox1_Click(object sender, EventArgs e)
which I don't understand :(
How can I make it into Public Class so I can change the event to "mouse enter" or "mouse leave"?
Thank you in advance.
If all you want to do is switch from design view to code view then use the F7 key. In older versions of VS, F7 would switch back again too but in later versions you use Shift+F7 to switch from code view to design view.
When in design view, you can select the form or a control/component, open the Properties window, click the Events button and then create or select a handler for any event and/or jump to it in code view. When in code view, you can use the drop-down lists at the top to select the form or a control/component or any field declared WithEvents and to create and/or jump to the handler for that event.
Already resolved. I was able to do it by creating another project and choosing the windows form application as visual basic, not c#.
Related
I am starting with C# programming, I have a scenario, where I create a windows form application. I have created a button inside the form and double click it to generate its associated click function. The visual studio generates the function with default name.
private void button1_Click(object sender, EventArgs e)
{
}
Now when I rename the button in properties, the function name remains same, making it difficult to relate button and function, I have an old code where a lot of such cases are present. So, I cannot delete and recreate the buttons and other things.
How can I rename the functions when I rename the button?
Right click on the function name and select Rename. The name will be highlighted (it's green on my system, see picture below). Edit the name and then hit the Apply button. The button's click event will correctly point to the newly renamed method.
You can change the name of the method by simply typing the new name in place of the old one when editing the code. Just like changing any text.
Then you can validate that the control still uses that event by either:
Go to the Form designer and select the control. Check its properties/events and make sure the name still lines up.
Go to the code generated by the form designer and find where it assigns the method to the event, and change it if it needs to be changed.
Either one of these should also update the other one automatically, though I imagine it's generally preferred to use the first approach for consistency with the rest of the form design process.
Note that the method name can be anything you like, there's no steadfast rule that says it must be controlName_eventName(object sender, EvenArgs e). For example, if you have multiple controls which share an event handler then you don't have to decide which control gets to be the one in the method name. You can give it any common name, such as saveFormChanges(object sender, EvenArgs e) and still assign it as the handler for that event.
You need to change the name of Event from the property window.
go to your designer Right Click -> Properties (F4) -> Events -> ClickEvent -> Type in the name what so ever you want and click this will create Click event with the name you entered
change button1_Click method name in code to new name and then press ctrl+. (period) and chose Rename. Alternatively, click on light bulb and select Rename.
Name of the function does not necessary need to match button name, it's just the convention which makes it easier to understand which element is bound to which function on which event.
If you enter the FormName.Designer.cs file, you will find InitializeComponent function which contains the properties setup of all form elements, including their event binding. For example, you will probably have something like this over there:
this.button1.Click += new System.EventHandler(this.button1_Click);
where button1 is name of the element, Click is name of the event of that element and button1_Click is the name of the function handling that event.
If you're in the design mode of the form FormName.cs [Design] you can find the lightning icon inside the VisualStudio Properties window (one of the tabs next to your Solution Explorer tab). Under that icon, you will find the list of all the possible events of the currently selected element in your designer. On the example of your button it should look like this:
You can handle the event binding either here or inside your FormName.Designer.cs file, but it's preferable through this view because content of the Designer file is automatically generated. InitializeComponent function is then called inside the constructor of your form which initializes the form based on the setup of your designer file.
I am new to Visual Studio and C#. I have created my first project -- an inventory application using MySql -- and everything works. But I needed to add a new button to the form for deleting records, so I dragged it in from the toolbox, changed the text ("Delete Product") and changed the design name ("DelBtn"). Adding the tool did not create the event handler, so I added the following with the MessageBox for testing:
private void DelBtn_Click(object sender, EventArgs e)
{
MessageBox.Show("Delete button clicked");
}
Clicking the button, however, has no effect, no MessageBox or anything else. Can someone help, please?
Go to your form designer, right-click your button, and select "Properties". In the properties window, there will be an "Events" button (it looks like a lightning bolt). Click that, and look for the Click event of your button. Make sure that DelBtn_Click is listed there. At that point, the button should respond with your code.
Hope this helps!
You need to make sure you've wired up the handler correctly. Look for the designer file that gets generated along with your form (I'm making the assumption that this is winforms).
Then you'll need a line like this in your InitializeComponent method:
this.button1.Click += new System.EventHandler(this.DelBtn_Click);
You don't have to do this in your designer file, you can do it anywhere you want that runs before your form is shown, e.g. the constructor. But it seems to me like something you did -- maybe by manually-renaming your event handler method -- has mangled the automatically-generated designer code that I mentioned above, and you probably just need to fix what's there already.
You need to delegate the event in your designer.cs if you wish:
DelBtn.Click += new System.EventHandler(this.DelBtn_Click);
Just adding a method with the same name as VS would have made for you won't bind the event to that method. Open the properties for the button and at the top of the resulting panel you'll see a lightning bolt. Click that and find the event you want and type in your method name there.
You need to go on the form, click on the button, on the properties menu you need to click on event,find onclick and double click the blank space.
It will automatically create the onclick method for you.
I'm a computer science student, and I'm in Web Applications right now. I know how to create an event in a WinForm (you just double-click whatever you want to make an event with) and I just don't know how to do it in a web form. I'm using Visual Studio 2012. say this is my control:
<asp:Button ID="playButton" runat="server" Text="Play" />
How do I create an event in the Form1.aspx.cs class?
You can just attach the event handler yourself, rather than using the IDE to attach the event for you, regardless of what type of environment you're in:
SomeEvent += myEventHandler;
Where myEventHandler is a method that is of the proper signature. If you type the above code Visual Studio will also provide an option to automatically generate a method of the appropriate signature for you if one does not already exist.
I think that what you're looking for is this:
In the code snippet you posted just add the attribute OnClick, like below:
<asp:Button ID="playButton" runat="server" Text="Play" OnClick="playButton_Click"/>
And inside your aspx.cs (codebehind) class you put the following code:
protected void playButton_Click(object sender, EventArgs e)
{
//put your code/logic here
}
There are a lot of examples on the internet for begginers on asp.net, just google a bit and you'll find a lot of sample codes (even in stack overflow).
Best regards.
Here is another easy way to create the default event using the Visual Studio IDE:
Add a button to a page and view it via the 'Design' tab
Highlight the button to make it in focus (do steps 3 and 4, or skip to Option #2)
Look at the properties window and select the little lightning bolt button that represents the events for the control.
Double-click in the area to the right of 'Click' to generate the default event.
Option #2: Just double click the button in the designer view to generate the event just as you you were used to in a WinForms application.
This will bring up the code window and you will be inside the event for the control you just selected.
How and where can I register a mouse event on a form. When I doubleclick on the form it'll generate the Form_Load event for me and I can add code into there. However when I add something like
private void Form1_MouseDown(object sender, MouseEventArgs e{
Console.WriteLine("mouse down")
}
However when I do a mousedown event on the form I don't get anything on the console. I know something is missing where I register the event to the form or something of the sort. Any ideas?
Thanks,
In the designer view, select the form and then in the properties window, click the little lightning bolt (events).
Here you're able to select which delegate method is called for which event. If you haven't created the method already, just double click the empty space next to an event and it will generate the code for you.
If you are using VS.net then you should find all the events in the property panel. Just pick the ones you want.
If you want to grammatically register an event then the code would looks like:
Form1.Click += new MouseEventHandler(Form1_MouseDown);
in order to unregister it's
Form1.Click -= new MouseEventHandler(Form1_MouseDown);
The event needs to be "wired up" either from the designer or from code. You can wire up an event from Visual Studio by double-clicking the event in the properties window:
Which generates code like the following in the auto-generated .designer file:
theForm.MouseDown += new MouseEventHandler(Form1_MouseDown);
You can also use the code like the above to manually wire up events in your Form_Load method.
With WinForms, you'll want to add it via the design view in Visual Studio.
While in the design view, select your form. Then, click on the 'Events' button in the Properties panel (looks like a lightning bolt) and type in the function name under the appropriate event. You can also click on an event here to automatically generate a new function in the code-behind.
As you noticed, double-clicking the form will automatically generate a certain function in the code-behind. For forms, it is Load but for other things it may be MouseDown or some other event.
By your explanation it seems like you have registered the event properly through the designer... if you still don't see the string on the console try System.Diagnostics.Debug.WriteLine (Maybe you are looking on the wrong window)
I switched from using VirtualStudio Express 2010 and I am trying to work with MonoDevelop and GTKSharp. Now. I am trying to switch to new editor software but it seems much different than VisualStudio.
What I am trying to do is basically to use widgets in this editor. For example when I am creating a button in VisualStudio and then double click the item then I am automatically getting the piece of code representing the item in the form. And here is the problem, how do I create events for buttons and comboboxes in MonoDevelop? I was looking through Internet examples for two days now and I can not figure out how to do it. The examples are not clear enough.
What I am trying to create? First I am trying to figure out how to use ComboBox and button which will allow me to choose one of 3 options in ComboBox and then under button event I want to fire 1 of 3 separate windows depending on which item has been picked.
Please provide me some easy examples how to work with MonoDevelop or else I will need to switch back to Windows OS :(
Please help!
// edit //
Lets say I got time on my hands and I am really interested in it. So if GTK# allow me so far:
public MainWindow () : base(Gtk.WindowType.Toplevel)
{
Build ();
button1.Clicked += button1_Click;
combobox1.SelectionGet += comboBox1_Selection; << is this correct?
}
private void button1_Click(object s, EventArgs e)
{
}
private void comboBox1_Selection (object s, EventArgs e)
{
switch (combobox1.SelectedIndex)
{
case 0:
window1.Show();
break;
case 1:
window2.Show();
break;
case 2:
window3.Show();
break;
}
}
But I feel like I am more lost than I was earlier.
Create a new C# GTK project.
Open up the "MainWindow.cs" and at the bottom right of the window click the "Designer" button to go into designer mode.
Next open up the hidden toolBox window at the right of the MonoDev window. Drag out a "Fixed" Container on the main windows canvas. This is required to put Buttons and stuff on your window.
Now drag a button on the Fixed container. To move the button around click on the little white box above the button when selected.
Now go to your SourceCode again. In the constructor write::
button1.Clicked += button1_Click;
Then make the new Click method.
private void button1_Click(object s, EventArgs e)
{
}
You don't need to add the handlers manually...
In Gtk the concept names changes a little, when a widget which is the same as a control in windows forms, just different name, does something it emits a "signal" then what you have to do is to "handle" that signal which would be the equivalent to catch the event in windows forms.
You can just select your widget in monodevelop and then go to the properties pane of that widget, there you will see a tab called "signals", this has the list of the signals that the widget specifically emits, thus allowing you to code actions when the widget does something like being clicked. Once there just double click in the signal you want to handle, for example, for a button, double click on the "Released" signal which is the signal emitted by the button when you click on it and release it.
I'm attaching a screenshot so you can get the picture. Hope it helps!!