I've been following this tutorial to name the elements on a windows form page. From what I gathered, the form will auto generate methods based on the name of the elements on the designer form.
However, while most of the textboxes, labels do update their method name when I click them and hit ENTER, some of them still reference to the default name.
In the attached image the label named "Option" remains as "label3_clicked".
Much appreciated.
Attached image of problem.
I never experience the behavior where the name of the event (which can be anything) is automatically updated to match the name of the control.
This is because the name of the event can be just anything (label3.Clicked += Whatever_Click_Whatever or even without the click Part). There is no naming rules that the compiler can check. There is just the default for auto generated ones.
What if you have a custom name that you don't want to change when changing the control name? So there is no automatic behavior here.
So what you can do is go to Form1.Designer.cs find the event like this:
this.Load += new System.EventHandler(this.Form1_Load);
Then Right click => Rename or Ctrl + R, Ctrl + R and change the name. This changes it is your form's code also.
You created the click event handler method while the Label was called label3. To fix this highlight the method name in your code behind and F2. That will enable you to change (refactor) the name of the method which in turn, will change the form designer as well.
In future just name your objects first and then create your event handler methods and all should be good.
It is a simple issue. You can fix this by creating a function when form is loaded. Set the default value for the form object in Form1_Load() function to change it on RunTime. You can get that function from form events. For example, If I want to change the name of the form, then approach is like
private void Form1_Load(object sender, EventArgs e) {
this.Text = "Initial Text"
}
After that, On your event which you want to change the Form Name. For example, I'm taking some function name
private void updateFormName_click(object sender, EventArgs e) {
this.Text = "Updated Text"
}
Related
Okay, so here's my problem: Whenever I create a button, textbox, listbox, then double-click to view the source code:
private void quitToolStripMenuItem_Click(object sender, EventArgs e)
{
}
After this has been auto-created by Visual Studio, it won't allow me to change it later.
So when I go into properties and want to change "quitToolStripMenuItem" (in the Name property field) to "mnuQuit," it will show up in the properties window properly, and will change the name (for all intents and purposes), but when I double-click to view source - it still shows the 'quitToolStrip..." name.
If I rename it to
private void mnuQuit_Click(object sender, EventArgs e)
It will throw a big hissy fit, and then my form design will be gone and a (basically) 404 message will appear instead of the form.
How can I do it without deleting the item and then recreating?
If you want to rename the event handler method, go to the designer, select the object (the menu item in your case), and in the properties window click the events button (it looks like a lightning bolt), and rename the event handler method from there.
In C#, the event handler is linked to the object that raise the event by a delegate, so the name of the method does not matter. You can have a button called Jack and event handler called Jill_Click that will actually handle the resize event of Jack. If you open the designer code you will see something like:
this.Jack.Resize += new System.EventHandler(this.Jill_Click);
Click on the Events (lightning) icon at the top of the Properties window and delete the text in the Click field.
Just refactor the method name? This will update it on the .designer.cs, in your designer and of course in your code.
Select the method name, right click, Refactor → Rename.
In the WindowsForms after double click on label, for example, I'm getting a code:
private void label1_Click(object sender, EventArgs e)
{
}
And if I'll delete it, it will be an error on the form's window, which want me to return the code. How can I delete it?
Open designer, select label1 and remove Click event handler in label's events list (Properties window).
On the Designer, locate the label1, then look at the Properties for that label and remove the event handler defined for the OnClick event. You can then delete the code.
Picture says a thousand words:
You have to remove the event handler either from the form designer.cs or from the property tab
First you need to remove it from the Properties window in the designer.
You have to remove the method name from the Events tab in the Properties window. After that it will either be automatically removed or you can delete it without issue.
You might also have to go into the automatically generated design code file and take out the part that adds that method as an event handler for your label.
I have two controls
a FormBox with a Button and a TextBox
a FormView with a ListView
I want to send the text from the textbox from FormBox to the FormView when I click the button.
There are several solutions to this request...
Maybe the simplest one is to pass to FormBox a reference to the existing instance of FormView (e.g. in FormBox constructor)... then you have to set Public as Modifiers in your ListView object (you can do it through form designer in Visual Studio, selecting your ListView object and then editing its properties).
Finally write something like:
myFormView.myListView.Items.Add(new ListViewItem(myTextBox.Text));
in your button click event handler.
This is not the best solution from the stylistic point of view, but maybe it's the simplest.
Accept this answer if it answers your question.
Forms are classes. Easy way is to define constructor for the second form that takes string as input. Now in the first form (where you have the button), instantiate the second form in button click event:
private void button1_Click(object sender, System.EventArgs e)
{
Form2 frm=new Form2(textBox1.Text);
//...
}
Now in the second form you get this text value as a string in the constructor. Hold this value in a string variable (for example: listVal) and add this value to the list:
var listViewItem = new ListViewItem(listVal);
listView1.Items.Add(listViewItem);
This is a way you can solve your problem. Please provide your own code work while asking any question.
In my winform, in the designer.cs section of the form i have
this.Button1.Text = "&Click";
this.Button1.Click += new System.EventHandler(this.Button1_Click);
in form.cs
private void Button1_Click(object sender, System.EventArgs e)
{
//Code goes here.
}
In one part of the form i have a treeview and when that treeview contents are expanded, i need to rename the above button and wire up a different event
Button1.Name = "ButtonTest";
ButtonTest.Click += new System.EventHandler(this.ButtonTest_Click);
However this fails saying ButtonTest is not found, how do i dynamicall change the name of the button and call a different click event method?
private void ButtonTest_Click(object sender, System.EventArgs e)
{
//Code goes here.
}
Once this is called ButtonTest_Click, I need to rename it back to Button1, any thoughts?
Button1 refers to a variable name. The variable points to an instance of the Button type which has a Name property. If you change the value of the Name property, it doesn't change the name of the variable. You'll still need to refer to the button as button1. In fact, it does nothing really to change the value of the button's Name property. The Name property only really only exists to aide the Windows Forms designer.
If you want to change an event handler from one method to another, you must first unsubscribe the original handler and then subscribe the new handler. Just change your code to this:
Button1.Name = "ButtonTest";
Button1.Click -= this.Button1_Click;
Button1.Click += this.ButtonTest_Click;
This can be done by several ways:
From the Menus: Edit -> Refactor -> Rename
By contextual Menu on the name of the Method: Refactor -> Rename
Put the cursor on the Method name and type Alt + Shift + F10 and then select Rename
Put the cursor on the Method name and press F2
I have a textbox in Form and i want to detect when the text has changed but the code I have found is giving me no joy.
I am probably missing something in the proporties or something you have to define before.
Here is my code:
private void tbxparkingTimesS1_TextChanged(Object sender, EventArgs e)
{
MessageBox.Show("You are in the ToolStripItem.TextChanged event.");
}
Thanks for any help with this trivial problem.
To wire the TextChanged event to a particular method inside your code do the following
Click on the TextBox inside your form
Open the properties windows (press F4 or menu View -> Property Window )
Select the event page (lightning icon)
Double click on the TextChanged property line
Insert your code inside the template build for you by Visual Studio
Have you assigned the event handler to the textbox?
Normally this will be done "behind the scenes" by Visual Studio - with the result being an additional line of code in your .designer file.
Something like:
this.tbxparkingTimesS1.TextChanged += new System.EventHandler(tbxparkingTimesS1_TextChanged);
(It['s been a while since I've done webforms - so that might be slightly off)
Double Click on Text box it will generate text change event for you.
private void tbxparkingTimesS1_TextChanged(object sender, EventArgs e)
{
// implement your code here.
}
When you double click VS will create event handler in your designer.cs file as bellow
this.tbxparkingTimesS1.TextChanged += new System.EventHandler(this.tbxparkingTimesS1_TextChanged);
You can do the same by using property window events or create event on code behind.