Summary of cross-page value passing skills in ASP. NET development

Use QueryString variable

QueryString is a simple method for transferring values. It can display the transmitted values in the address bar of a browser. This method can be used to transmit one or more numeric values with low security requirements or simple structure. However, this method cannot be used to pass arrays or objects. The following is an example:

A. aspx C # code

Private void button#click (object sender, System. EventArgs e)
{
String s_url;
S_url = "B. aspx? Name = "+ Label1.Text;
Response. Redirect (s_url );
}

B. C # code in aspx
Private void Page_Load (object sender, EventArgs e)
{
Label2.Text = Request. QueryString ["name"];
}

Use Application object variables

The scope of the Application object is global, that is, it is valid for all users. The common methods are Lock and UnLock.

A. aspx C # code

Private void button#click (object sender, System. EventArgs e)
{
Application ["name"] = Label1.Text;
Server. Transfer ("B. aspx ");
}

B. C # code in aspx

Private void Page_Load (object sender, EventArgs e)
{
String name;
Application. Lock ();
Name = Application ["name"]. ToString ();
Application. UnLock ();
}

Use Session Variables

Presumably, this is definitely the most common usage. Its operations are similar to those of the Application, which act on individual users. Therefore, excessive storage will result in the depletion of server memory resources.

A. aspx C # code

Private void button#click (object sender, System. EventArgs e)
{
Session ["name"] = Label. Text;
}

B. C # code in aspx

Private void Page_Load (object sender, EventArgs e)
{
String name;
Name = Session ["name"]. ToString ();
}

 

Use Cookie object variables

This is also a common method. Like Session, it is for every user, but there is a fundamental difference, that is, cookies are stored on the client, session is stored on the server. In addition, the use of cookies should be used in combination with the ASP. NET built-in Object Request.

A. aspx C # code

Private void button#click (object sender, System. EventArgs e)
{
HttpCookie cookie_name = new HttpCookie ("name ");
Cookie_name.Value = Label1.Text;
Reponse. AppendCookie (cookie_name );
Server. Transfer ("B. aspx ");
}

B. C # code in aspx

Private void Page_Load (object sender, EventArgs e)
{
String name;
Name = Request. Cookie ["name"]. Value. ToString ();
}

 

Use the Server. Transfer Method

This can be said to be the method used for face object development. It uses Server. the Transfer method directs the process from the current page to another page. The new page uses the response stream of the previous page. Therefore, this method is completely object-like and concise and effective.

A. aspx C # code

Public string Name
{
Get {return Label1.Text ;}
}
Private void button#click (object sender, System. EventArgs e)
{
Server. Transfer ("B. aspx ");
}

B. C # code in aspx
Private void Page_Load (object sender, EventArgs e)
{
A newWeb; // instance a form
NewWeb = (source) Context. Handler;
String name;
Name = newWeb. Name

}