Adding events using WINFORMS

irwin young

i have already existing program which contain form and handle line like:

this.pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint);
this.pictureBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseDown);
this.pictureBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseMove);
this.pictureBox1.MouseUp += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseUp);

i saw that whenever i add a new component like button a new event line is added like:
this.button1first.Click += new System.EventHandler(this.button1_Click);

when i created a new winform project i saw that such handle lines were not created when i added a button
how can i cause the ide to add automaticly those event lines

7 Replies

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Vulpes14y ago
In the simplest Windows Form application, the source code is in 3 files:

1. Program.cs contains the Program class which includes the Main() method for the application. By default, this contains code to create and display the startup form (Form1 by default).

2. Form1.cs contains one of the partial classes for Form1. This is the file to which eventhandlers are added and where you write your own code.

3. Form1.Designer.cs contains the other partial class for Form1. This is the file where the Visual Studio designer writes code as you add controls to your form and set (or change) their properties in the Properties Box. It also 'wires up' eventhandlers which you've added from the designer to the appropriate event. Most of the code is written to a method called InitializeComponent and, as I said earlier, you should not normally try to edit this method manually.

Further files will be created for classes or additional forms which you add to your application, amongst other things.

When the application is built, the C# compiler combines all these files and #2 and #3 are merged into a single class for Form1 combining the code written by yourself and by the designer.
irwin young14y ago
so the code in written in 2 separate files?
the ControlForms.Designer.cs which include the 'this.' line and the
Program.cs which includes the handler?
dont you integrate them to 1 file?
Vulpes14y ago
This line:

this.button2.Click += new System.EventHandler(this.button2_Click);

should be inside a method called InitializeComponent which is within the "Windows Form Designer generated code" in the Form1.Designer.cs file.

This file should be listed in Solution Explorer and can be opened from there.

The code in this method should not normally be edited manually as any changes you make are likely to be overwritten when the next changes to your form are made from the Visual Studio designer.
irwin young14y ago
when i do so only the following function appears:
private void button2_Click(object sender, EventArgs e)

{
}

and the following line does not appear:

this.button2second.Click += new System.EventHandler(this.button2_Click);
Frogleg14y ago
Do you want to dynamically add buttons ? (ie thru programming)-, or drag them from the toolbox

Using the toolbox
Create a form, open the toolbox - drag a button onto form
Double click the button and the code window will open with the button click event added to it
irwin young14y ago
it works only when i use the program that someone else written before me
a lines like those appear:

//

// button2second

//

this.button2second.Location = new System.Drawing.Point(635,
378);
this.button2second.Name = "button2second";this.button2second.Size = new System.Drawing.Size(68, 35);
this.button2second.TabIndex = 31;this.button2second.Text = "button2second";
this.button2second.UseVisualStyleBackColor = true;
this.button2second.Click += new System.EventHandler(this.button2_Click);

but on a new project i opened only this function appears:
private void button2_Click(object sender, EventArgs e)

{
}

may be thre is a way to make the specific document add those lines automatically whenever the button is being added
Frogleg14y ago
Look at this