Several methods for transferring inter-page values using ASP. NET

Method 1:

Pass through URL link address

Send. aspx:
Protected void button#click (Object sender, eventargs E)
{
Request. Redirect ("default2.aspx? Username = honge ");
}
Receive. aspx:
String username = request. querystring ["username"]; To obtain the parameter value.
 
Method 2:

Post.

Send. aspx

<Form ID = "form1" runat = "server" Action = "receive. aspx" method = post>
<Div>
<Asp: button id = "button1" runat = "server" onclick = "button#click" text = "button"/>
<Asp: textbox id = "username" runat = "server"> </ASP: textbox>
</Div>
</Form>
Receive. aspx
String username = ruquest. Form ["receive"];

Method 3:

Through session

Send. aspx:
Protected void button#click (Object sender, eventargs E)
{
Session ["username"] = "honge ";
Request. Redirect ("default2.aspx ");
}
Receive. aspx:
String username = session ["username"]; To obtain the parameter value.

Method 4:

Use Application

Send. aspx:
Protected void button#click (Object sender, eventargs E)
{
Application ["username"] = "honge ";
Request. Redirect ("default2.aspx ");
}
Receive. aspx:
String username = application ["username"]; To obtain the parameter value.

Method 5:

Use server. Transfer

Send. aspx:

Public string name
{
Get {
Return "honge ";
}
}
Protected void button#click (Object sender, eventargs E)
{
Server. Transfer ("default2.aspx ");
}

Receive. aspx:

Send d = context. handler as send;
If (D! = NULL)
{
Response. Write (D. Name); to obtain the parameter value.
}

If you can use this method in Asp.net 2.0: previouspage

Previouspage d = context. handler as previouspage;
If (D! = NULL)
{
Response. Write (D. Name); to obtain the parameter value.
}

It can also be used as follows:

Send. aspx:
<Asp: button id = "btnsubmit" runat = "server" postbackurl = "~ /Reveive. aspx "text =" Submit "/>
Receive. aspx:
<% @ Previouspagetype virtualpath = "~ /Default. aspx "%>
String name = previouspage. Name; to obtain the parameter value.

If masterpage is used in your page, server. the previouspage passed by transfer is invalid. I don't know why. so if masterpage is used, it is best to use session or context. items ["username.

Querystring

Using querysting to pass values between pages is already a very old mechanism. The main advantage of this method is that it is very simple to implement, however, its disadvantage is that the passed value is displayed on the address bar of the browser (Insecure), and the object cannot be passed, however, this method is a good solution when the number of transmitted values is small and the security requirements are not high. The steps for using this method are as follows:
1. Use the control to create a web form (Form)
2. Create buttons and link buttons that can return the form
3. Create a character variable to save the URL in the button or link button click event.
4. Add the querystring parameter to the saved URL.
5. Use response. Redirect to redirect to the saved URL above

The followingCodeThe snippet demonstrates how to implement this method:

Source Page code:

Private void button#click
(Object sender, system. eventargs E)
{
String URL;
Url = "anotherwebform. aspx? Name = "+ textbox1.text +" & Email = "+ textbox2.text;
Response. Redirect (URL );
}

Target Page code:

Private void page_load
(Object sender, system. eventargs E)
{
Label1.text = request. querystring ["name"];
Label2.text = request. querystring ["email"];
}

Use session Variables

Using the session variable is another way to pass values between pages. In this example, we store the value in the control in the session variable and then use it on another page, to transfer values between different pages. However, it should be noted that storing too much data in the session variable will consume a lot of server resources, so you should be careful when using the session. Of course, we should also use some cleanup actions to remove unnecessary sessions to reduce unnecessary resource consumption. The general steps for transferring values using session variables are as follows:
1. Add necessary controls to the page.
2. Create buttons and link buttons that can return the form
3. In the Click Event of a button or link button, add the control value to the session variable.
4. Use the response. Redirect method to redirect to another page.
5. Extract the session value from another page. Clear the value explicitly when determining that this session is not required.

The following code snippet demonstrates how to implement this method:

Source Page code:

Private void button#click
(Object sender, system. eventargs E)
{
File: // textbox1 and textbox2 are webform
File: // controls
Session ["name"] = textbox1.text;
Session ["email"] = textbox2.text;
Server. Transfer ("anotherwebform. aspx ");
}

Target Page code:

Private void page_load
(Object sender, system. eventargs E)
{
Label1.text = session ["name"]. tostring ();
Label2.text = session ["email"]. tostring ();
Session. Remove ("name ");
Session. Remove ("email ");
}

Use server. Transfer

This method is a little more complex than the method described above, but it is particularly useful in inter-page value transfer, using this method, you can access the exposed value in the form of Object Attributes on another page. Of course, this method is used, you need to write additional code to create some attributes so that you can access it on another page. However, the benefits of this method are also obvious. In general, this method is concise and object-oriented. The entire process of using this method is as follows:
1. Add necessary controls to the page.
2. Create the get attribute process of the returned value
3. Create buttons and link buttons that can return the form
4. Click the event processing button.ProgramTo transfer the server. Transfer Method to the specified page.
5. On the second page, we can use context. the handler property is used to obtain the reference of the previous page instance object. With it, you can access the value of the control on the previous page.

The following code comprehensively implements the above steps:

Source Page code:

Add the following code to the page

Public string name
{
Get
{
Return textbox1.text;
}
}
Public String email
{
Get
{
Return textbox2.text;
}
}

Then call the server. Transfer Method

Private void button#click
(Object sender, system. eventargs E)
{
Server. Transfer ("anotherwebform. aspx ");
}

Target Page code:

Private void page_load
(Object sender, system. eventargs E)
{
File: // create instance of source web form
Webform1 WF1;
File: // get reference to current handler instance
WF1 = (webform1) Context. Handler;
Label1.text = wf1.name;
Label2.text = wf1.email;
}

Summary

This article describes how to use different methods to implement value transfer between ASP. NET pages. The three methods are querystring, session, and server. Transfer. We should understand the similarities and differences between these methods. I hope this article will be helpful to you until you can use it in your code!
Source: China tutorial online, http://www.5istudy.cn