Data transfer between DOTNET forms

Data transfer between DOTNET forms

Cancersyf aspxcn.com 2002-09-02

1. webform

L use the Redirect method of httpresponse class in system. Web namespace to pass and the querystring method of httprequest class receives

Used in a method of passing the source class webform1

Response. Redirect ("webform2.aspx? S = 1 & SS = 11 ");

// Methods and attributes of the httpresponse class are exposed through the internal response object of ASP. NET.

// Therefore, response can use the former method.

Passing in the target class webform2

Private void page_load (Object sender, system. eventargs E)

{

// Place the user hereCodeTo initialize the page

Int loop1;

Namevaluecollection Coll;

// Load form variables into namevaluecollection variable.

Coll = request. querystring;

// The methods and attributes of the httprequest class are made public through the internal request object of ASP. NET.

// Get names of all forms into a string array.

String [] arr1 = Coll. allkeys;

For (loop1 = 0; loop1 <arr1.length; loop1 ++)

{

Response. Write (arr1 [loop1] + "=" + Coll. getvalues (arr1 [loop1]). getvalue (0) + "<br> ");

}

}

// This lists the values of S & SS passed from webform1.

L here I want to explain the server-side control <form runat = Server> </form> (I think) in ASP. net is only a container of controls on other servers. It can no longer use the action attribute to submit data to other pages as ASP does. The following is the original msdn text:

MS-help: // Ms. VSCC/ms. msdnvs.2052/cpgenref/html/cpconhtmlformcontrol.htm

Note that the action attribute is always set to the URL of the page. You cannot change the action attribute. Therefore, you can only send a message back to the page.

2. windowsform

L use form constructor form () to pass values.

Form class can have multiple constructors. You can add one constructor for passing values, as shown below:

Public form2 ()

{

//

// Required for Windows Form Designer support

//

Initializecomponent ();

//

// Todo: add Any constructor code after initializecomponent calls

//

}

Public form2 (int iii)

{

//

// Required for Windows Form Designer support

//

Initializecomponent ();

// Add a label to display the incoming values.

This. label1.text = III. tostring ();

//

// Todo: add Any constructor code after initializecomponent calls

//

}

You can use the following method to open form1 of form2 to pass 123 to form2:

// Windowsapplication1 is my project name

Windowsapplication1.form2 frm2 = new windowsapplication1.form2 (123 );

Frm2.show ();

L use the attributes of the class to pass the value.

Pass the following declaration of the target class form2

Private int I2;

Public int ilen

{

Get {return I2 ;}

Set {I2 = value ;}

}

// Add a label to display the incoming values.

Private void form2_load (Object sender, system. eventargs E)

{

This. label1.text = This. i2.tostring ();

}

The transfer source class form1 is used as follows:

Windowsapplication1.form2 frm2 = new windowsapplication1.form2 ();

Frm2.ilen= 1234;

Frm2.show ();