C, a method that calls two form classes A and B, how to make A end and then call B urgent!! ）

Write in the click of button1; Then write using system in the main function;

using ;

using ;

using ;

namespace xx

static class program

The main entry point to the application.

stathread]

static void main();

aform aform = new aform();

if ( openfiledialog ()

new openfiledialog() put it in aform, you can handle the event after **, don't put it in click...

It's a bit of a mess.

If you open B after Aform is closed, you can open B in the closing event function of Aform.

Add a dialogresult=;

Then the click event is changed to the following;

if ( ==dialogresult .ok )new openfiledialog();

There's a way to try.

Define this method as public

Define a private member for form four, which is a form one object: form1 frm1;

Add a parameter to the constructor of form four, which is an example of form one.

public form4(from1 frm1);

If form four is born from the form, then the initialization of form four is auspicious.

form4 frm4=new form4(this) so that you can call the method of form 1 in form 4 via frm1.

Concise neutral single?

Take an instance of form one as a parameter to the constructor of form four.

The first floor is correct.

Define a public static window1 w1 in window1;

add w1=this to the constructor;

Access methods in other classes:

For example, if you click the A1, A2, and A3 buttons in Form A, you can click on the three buttons to invoke different methods in Form B.

Then you can solve this problem by passing the parameters, if you click a1, pass a parameter value as a1, in the b form, if the parameter value is a1, then I will call the method corresponding to a1.

There are two methods, one is to delegate, which passes the functions of form A to form B.

When form B is instantiated, form A is passed as a parameter.

I still don't understand it, but if you just want to transfer the data from form A to form B, you can try delegation.

With a commission? Declare the delegate in A, assign a value (assign a method) to the delegate in B, and call it back in A.

By instantiating B in A, you can call a member of B.

You need to add a reference to the DLL file of this class to this startup item, and then when you pass the value to B, you can easily pass this ID to the field in E, and you will receive it.

It still depends on what the permission of this method is.,If it's private, it's not okay.,Public.。

Just call it and you're good to go.

c c = new c();

This method() is a method inside a.

Want. The control executed in form B is eventually added to B.

If you want to be more convenient, it's best to write a public class, and write the methods that AB needs to use in it, so that the call can be displayed.

First form A must be an object, then form B creates a declaration that the control of form A must display on form A, and if it defaults, it will be created on form B

For example, sqldataset, sqldatatable, etc., I have detailed instructions and specific usage cases here, as well as their related performance instructions, hi me, I send it to you!