In Windows Form, I summarize four methods: global variables, attributes, form constructors, and delegate.
The first global variable:
This is the easiest, as long as the variable is described as static, directly reference Form1 variables in Form2, the code is as follows:
Define a Static Variable in Form1 Public Static Int i = 9;
The button button in FORM2 is as follows:
Private void Button1_Click (Object Sender, System.Eventargs E)
{
TextBox1.text = form1.i.tostring ();
}
The second method is to use the attribute, please see my blogger details:
Http://blog.9cbs.net/tjvictor/archive/2006/06/04/772711.aspx
The third method is to use constructor:
The Form1's Button button writes this:
Private void Button1_Click (Object Sender, System.Eventargs E)
{
FORM2 TEMP = New Form2 (9);
TEMP.SHOW ();
}
The constructor of form2 writes this:
Public Form2 (INT i)
{
InitializationComponent ();
TextBox1.text = i.tottring ();
}
The fourth method is to use Delegate, the code is as follows:
Delegate first in Form2
Public Delegate Void ReturnValue (INT I);
Public ReturnValue ReturnValue;
The Button button code in FORM2 is as follows:
Private void Button1_Click (Object Sender, System.Eventargs E)
{
IF (ReturnValue! = NULL)
RETURNVALUE (8);
}
The Button button in Form1 is as follows:
Private void Button1_Click (Object Sender, System.Eventargs E)
{
FORM2 TEMP = New Form2 ();
Temp.ReturnValue = New Temp.form2.ReturnValue (showValue);
TEMP.SHOW ();
}
Private Void ShowValue (INT i)
{
TextBox1.text = i.tottring ();
}
Click on the button of Form2, the value in the textbox in Form1 will change accordingly.
In these four methods,
The first is two-way passages, that is, Form1 and Form2 change the value of i, and the other will be affected.
The second method can be two-way by two ways.
The third method is Form1-> Form2 unidirectional value.
The fourth method is FORM2-> Form1 one-way passage.
I have a new way to add new ways, and one is Event, and it is similar to delegate. I don't say it here.
