Method of passing values for C # forms

Learn about the display of the form, and then summarize the form's method of passing the value:

1. Through the characteristics of the constructor: The value is one-way (can not pass the value of each other), the implementation of a simple code is as follows:
In the form Form2

intvalue1;stringvalue2; PublicForm2 (intValue1,stringvalue2)
{InitializeComponent ();
 This. value1 = value1;
 This. value2 =value2;
This is called in form Form1.NewForm2 (111,"222"). Show ();//This gives the 111, "222", 2 values to the Form22. Static variable characteristics: The pass value is bidirectional, the implementation of simple implementation code is as follows: Define a static member in an app class
Value Publicclassapp
{  PublicStaticstringvalue;
This is called App.value in form Form1.="F2";//assigns a value of new Form2 () to a static member.  Show (); //show Form2 in form Form2 This. Text = App.value;//retrieving the value of the App.valueApp.value ="Form2";//assigns a value to app.value so that other forms call3. Through the form's Public property value feature: Implement the simple implementation code as follows: Define a public property form2value in form Form2, get and set the TextBox1 text value

 PublicstringForm2value
{

Get{         return This. TextBox1.Text;
}

Set
{          This. TextBox1.Text =value;
}
This is called in form Form1.
Form2 F2=NewForm2 (); F2. Form2value="Ok";//assign OK F2 to Form2 's textBox1.   ShowDialog (); 4. Through the form's public property values and the Owner property characteristics: The implementation of simple, flexible implementation of the code as follows:
In the form Form1 PublicintForm1value =1;
Form2 F2 =NewForm2 (); F2. ShowDialog ( This);//Pass Form1 as the owner of the Form2 to Form2 in the form Form2
//the owner of the Form2 is Form1Form1 F1= (FORM1)
 This. Owner;//the value taken to Form1 is 1.MessageBox.Show (F1. Form1value. ToString ());//Assign 222 F1 to Form1 's form1value. Form1value = 222;

5. Through the form's public property values and Application.openforms Property Description: Application.openforms property: Gets the collection of open forms that belong to the application. (This property is in. NET version Framework2.0) Implementation code is as follows:
In the form Form1 PublicintForm1value =1;
Form2 F2 =NewForm2 ();
F2. Show ();
In the form Form2stringFormName ="Form1"; Form FR= Application.openforms [FormName];

if(FR! =NULL )
{Form1 F1= (Form1) fr;//the value taken to Form1 is 1.MessageBox.Show (F1. Form1value.tostring ());//Assign 222 F1 to Form1 's form1value. Form1value = 222;
}

6The implementation code of the event is as follows: Define the public property form2value in form Form2, get and set the TextBox1 text value and also define an accept event PublicstringForm2value
{
 　　 Get
{         return This. TextBox1.Text;
}

Set
{          This. TextBox1.Text =value;
}
}  PublicEventEventHandler Accept; PrivatevoidButton1_Click (Objectsender, EventArgs e)
{     if(Accept! =NULL)
{Accept ( This, Eventargs.empty);//when a form triggers an event, it passes itself a reference
}
} Form2 F2 in form Form1=NewForm2 (); F2.accept+=NewEventHandler (f2_accept);
F2. Show (); voidF2_accept (Objectsender, EventArgs e)
{ //the receiver of the event gets a Form2 reference by a simple type conversion
Form2 F2 = (Form2) sender; //received the TextBox1.Text of the Form2 This. TextBox1.Text = F2. Form2value;
}

Method of passing values for C # forms