session 數組

最新推荐文章于 2021-08-10 14:30:04 发布

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最新推荐文章于 2021-08-10 14:30:04 发布

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原文链接：http://www.cnblogs.com/Nina-piaoye/archive/2006/07/03/441401.html

本文介绍了如何在ASP中正确地使用Session对象来存储和修改数组。通过实例演示了存储数组到Session对象的方法，并强调了从Session中检索数组并修改其元素时的最佳实践。

String[] x = {"a","b","c"}; session.setAttribute("x",x); String[] xx = (String [])session.getAttribute("x");

If you store an array in a Session object, you should not attempt to alter the elements of the stored array directly. For example, the following script will not work:

<% Session("StoredArray")(3) = "new value" %>

This is because the Session object is implemented as a collection. The array element StoredArray(3) does not receive the new value. Instead, the value is indexed into the collection, overwriting any information stored at that location.

It is strongly recommended that if you store an array in the Session object, you retrieve a copy of the array before retrieving or changing any of the elements of the array. When you are done with the array, you should store the array in the Session object again so that any changes you made are saved. This is demonstrated in the following example:

---file1.asp---
<%
'Creating and initializing the array
Dim MyArray()
Redim MyArray(5)
MyArray(0) = "hello"
MyArray(1) = "some other string"

'Storing the array in the Session object.
Session("StoredArray") = MyArray

Response.Redirect("file2.asp")
%>

---file2.asp---
<%
'Retrieving the array from the Session Object
'and modifying its second element.
LocalArray = Session("StoredArray")
LocalArray(1) = " there"

'Printing out the string "hello there."
Response.Write(LocalArray(0)&LocalArray(1))

'Re-storing the array in the Session object.
'This overwrites the values in StoredArray with the new values.
Session("StoredArray") = LocalArray
%>

转载于:https://www.cnblogs.com/Nina-piaoye/archive/2006/07/03/441401.html