C # How to pass values between forms. I don't know how to implement the functions. Write down the functions and study them later...

1. Delegate

Two forms: the form is very simple. Only the color change function is implemented:

CodeAs shown below, only the button Event code is pasted:

Open the form2 button event

 Private   Void Button#click ( Object  Sender, eventargs e) {form2 frm2 = New  Form2 (); frm2.changecolor + = New  Changeformcolor (frm2_changecolor); frm2.show ();} Void Frm2_changecolor ( Bool  Topmost ){  This . Backcolor = Color. lightblue;  This . Text = "  Changed successfully!  "  ;} 

Button for changing the color of form1

      //  Define a delegate          Public  Delegate   Void Changeformcolor ( Bool  Topmost );  //  Give an event          Public   Event  Changeformcolor changecolor;  Private   Void Button#click ( Object  Sender, eventargs e) {changecolor (  True );  This  . Close ();} 

 

2. Let's take a look.

After the modification, press confirm, disable form2, and automatically refresh form1. The idea is as follows: Query on form1 to display the datagridview, right-click and choose modify. The mode form form2 is displayed. Modify and close, automatically refresh form1.

Form1 form code

 
//Add to the modify button. The mode form form2 is displayed to modify it.Form2 form2 =NewForm2 (); form2.owner=This; Form2.showdialog ();
 

Confirm button code

If(//Your modification method){MessageBox. Show ("Modified successfully!");//Forcibly convert a form with form2 to form1, and assign the value to form1, a variable of the form1 form type.Form1 form1 = (form1)This. Owner;//Note that the following select () method is a query method in form1. Its function is equivalent to refresh, but refresh does not work. It doesn't matter. Call this method to refresh it.Form1.Select(); Close ();}
 

 

3. The third type is a little troublesome, but not bad (if the modified data is single and relatively small)

The two forms are as follows (the interface is very simple and mainly used for demonstration. However, if you use a button in form2 to submit data, you cannot close the form. You must write it to the formclosed event, depressing ...... who has a better way to communicate with each other ):

Click choose to pop up form2. After selecting the gender, close the form and pass the data to the form1sex box. If there are few codes, paste them all.

All form1 form code

 Using  System;  Using  System. Collections. Generic;  Using  System. componentmodel;  Using  System. Data;  Using  System. drawing; Using  System. LINQ;  Using  System. text;  Using  System. Windows. forms;  Namespace  Test {  Public   Partial   Class  Form1: FORM {  Public  Form1 () {initializecomponent ();}  Private  Void Button#click ( Object  Sender, eventargs e) {form2 frm2 = New  Form2 ();  If (Frm2.showdialog () = Dialogresult. OK ){  //  The mode form pops up and assigns a value to strsex of the public attribute in form2. Textbox2.text = Frm2.strsex; frm2 = Null ; // Clear  }}}} 

Form2 form code

 Using  System;  Using  System. Collections. Generic;  Using  System. componentmodel;  Using  System. Data;  Using  System. drawing;  Using  System. LINQ; Using  System. text;  Using  System. Windows. forms;  Namespace  Test {  Public   Partial   Class  Form2: FORM {  Public  Form2 () {initializecomponent ();}  //  Define a private property STR for storing sex. If you use any property, add the property by yourself. When you finish, stop the cursor to the property STR and press Ctrl + R, e to automatically encapsulate the property.         Private   String  STR;  Public   String Strsex //  Here the automatic encapsulation should be Str. I changed the name and the table struggled with this  {  Get { Return  STR ;}  Set {STR = Value ;}}  Private   Void Form2_formclosed ( Object  Sender, formclosedeventargs e ){  //  Close the form after the assignment              This . Strsex = Combobox1.selectedtext;  This . Dialogresult = Dialogresult. OK ;}}} 

 

OK, I have finished writing. This is mainly to take notes for myself, so that you can read the notes later. If you don't read the notes, you will see the notes. If there is anything wrong, please point it out, don't use jww. despise such people! I am also a beginner. Who is not here !!!

Reprinted please indicate the source: http://www.cnblogs.com/xw-yanger/archive/2012/06/26/2563562.html

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