(C #) transfer values between winform forms

1. Constructor

Features: it is easy to transmit values in one way (values cannot be transferred to each other ).

ImplementationCodeAs follows:

In form form2

Int value1;

String value2;

Public form2 (INT value1, string value2)

{

Initializecomponent ();

This. value1 = value1;

This. value2 = value2;

}

This is called in form form1.

New form2 (111, "222"). Show (); // in this way, 111, "222", these two values are sent to form2

 

2. Use static variables

Features: The value transfer function is bidirectional and easy to implement.

The implementation code is as follows:

Define a static member value in an app class

Public class app

{

Public static string value;

}

This is called in form form1.

App. value = "F2"; // assign a value to a static member

New form2 (). Show (); // display form2

In form form2

This. Text = app. value; // retrieves the value of APP. value.

App. value = "form2"; // assign a value to app. value so that other forms can call

 

3. Public attribute values of the form

Features: easy to implement

The implementation code is as follows:

Define a public attribute form2value in the form form2 to get and set the text value of textbox1

Public String form2value

{

Get

{

Return this. textbox1.text;

}

Set

{

This. textbox1.text = value;

}

}

This is called in form form1.

Form2 F2 = new form2 ();

F2.form2value = "OK"; // assign OK to textbox1 of form2

F2.showdialog ();

 

4. Public attribute values and owner attributes of the form

Features: simple and flexible

The implementation code is as follows:

In form form1

Public int form1value = 1;

Form2 F2 = new form2 ();

F2.showdialog (this); // pass form1 as the form2 owner to form2

In form form2

// Form2 is owned by form1

Form1 F1 = (form1) This. owner;

// The value of form1 is 1.

MessageBox. Show (f1.form1value. tostring ());

// Assign a value of 222 to form1value of form1

F1.form1value = 222;

 

5. Public attribute values of the form and application. openforms attributes

Description: application. openforms attributes: obtains an application.Program. (This attribute is in. Net framework2.0)

The implementation code is as follows:

In form form1

Public int form1value = 1;

Form2 F2 = new form2 ();

F2.show ();

In form form2

String formname = "form1 ";

Form Fr = application. openforms [formname];

If (fr! = NULL)

{

Form1 F1 = (form1) fr;

// The value of form1 is 1.

MessageBox. Show (f1.form1value. tostring ());

// Assign a value of 222 to form1value of form1

F1.form1value = 222;

}

 

6. Events

The implementation code is as follows:

Define the public attribute form2value in the form form2 to get and set the text value of textbox1

It also defines an accept event.

Public String form2value

{

Get

{

Return this. textbox1.text;

}

Set

{

This. textbox1.text = value;

}

}

Public event eventhandler accept;

Private void button#click (Object sender, eventargs E)

{

If (accept! = NULL)

{

Accept (this, eventargs. Empty); // when the form triggers an event, pass its own reference

}

}

In form form1

Form2 F2 = new form2 ();

F2.accept + = new eventhandler (f2_accept );

F2.show ();

Void f2_accept (Object sender, eventargs E)

{

// The Event receiver obtains the reference of form2 through a simple type conversion.

Form2 F2 = (form2) sender;

// Receives the textbox1.text of form2.

This. textbox1.text = f2.form2value;