Asp. NET Cross page transfer value Skill summary

Asp.net| Tips | page

Today, someone in the TM group asked about the way the page was passed, and sparked a discussion. It seems that there are a lot of people concerned, so I made a summary of my personal point of view, I hope to help.

　　1. Using QueryString variables

QueryString is a very simple way of passing values, and he can display the value of the transfer in the browser's address bar. You can use this method if you pass one or more values that are not of high security requirements or are simple in structure. However, this method is not available for passing arrays or objects. Here is an example:

A.aspx's C # code

private void Button1_Click (object sender, System.EventArgs e)
{
String S_url;
S_url = "B.aspx?name=" + Label1.Text;
Response.Redirect (S_url);
}

C # code in b.aspx

private void Page_Load (object sender, EventArgs e)
{
Label2.Text = request.querystring["name"];
}

　　2. Using Application Object variables

The scope of the Application object is the entire global, which means it works for all users. Its commonly used methods are lock and unlock.

A.aspx's C # code

private void Button1_Click (object sender, System.EventArgs e)
{
application["name"] = Label1.Text;
Server.Transfer ("b.aspx");
}

C # code in b.aspx

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

3. Use Session Variables

Presumably this is the most common use of everyone, its operation is similar to application, the role of users, so, excessive storage will lead to the depletion of server memory resources.

A.aspx's C # code

private void Button1_Click (object sender, System.EventArgs e)
{
session["name"] = Label.text;
}

C # code in b.aspx

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

4. Use Cookie object variables

This is also common use of the method, as with the session, what it is for each user, but there is an essential difference, that is, cookies are stored in the client, and the session is stored on the server side. And the use of cookies should be used in conjunction with the ASP.net built-in object request.

A.aspx's C # code

private void Button1_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");
}

C # code in b.aspx

private void Page_Load (object sender, EventArgs e)
{
String name;
Name = request.cookie["Name"]. Value.tostring ();
}

　　5. Using the Server.Transfer method

This can be said to be the object of the development of the method used, which uses the Server.Transfer method to guide the process from the current page to another page, the new page uses the previous page of the response stream, so this method is completely surface image object, concise and effective.

A.aspx's C # code

public string Name
{
get{return Label1.Text;}
}
private void Button1_Click (object sender, System.EventArgs e)
{
Server.Transfer ("b.aspx");
}

C # code in b.aspx

private void Page_Load (object sender, EventArgs e)
{
a newweb; Instance a form
Newweb = (source) Context.Handler;
String name;
name = Newweb.name;
}