Asp.net会话通过ref或val分配值 [英] Asp.net Session assign value by ref or by val

问题描述

我需要提问
是通过val或ref
进行的会话工作 意思是如果我说
iam在网站上工作，并使用linq转换为sql dbml
我已将存储过程存储在dbml
例如说我的存储过程叫sp
在我的C#代码中
1-说sesssion ["a"] = list< sp>
2-list< sp> ;.添加新行
3-当我再次查看会话时，我发现它的价值增加了​​
而不是我没有在添加新行后再次分配它

i need to ask question
is session work by val or by ref
mean if i said
iam working on web site and use linq to sql dbml
i have stored procedure in dbml
for example say my stored procedure called sp
in my c# Code
1- say sesssion["a"]=list<sp>
2- list<sp>.add new row
3- when i look again on my session i find it''s value increase
instead of i didn''t assign it it again after add the new row

推荐答案

为什么不简单地尝试一下呢?

会话将项目存储为SessionStateItemCollection.
反过来，这是对象的集合.

因此，我认为会话中的项目将是引用类型.

Why don''t you simply try it out?

A session stores items as a SessionStateItemCollection.
This, in turn, is a collection of objects.

So I would think items in a session will be reference type.

session["a"]将为1.

至于您更新的(第二个)问题，sesssion ["a"]中的列表将与您添加一行的列表相同.

请参阅
值类型(C#参考) [引用类型(C#参考) [

session["a"] will be 1.

As for your updated (second) question, the list in sesssion["a"] will be the same list you added a row to.

Refer to
Value Types (C# Reference)[^]
Reference Types (C# Reference)[^]

If you don''t want the list in your session to get the row you add you can do

Session["a"] = new List<...>(list);

是如果您将其放入页面加载方法中，就足够简单地尝试一下:

It is simple enough to try out, if you put this into the page load method:

int x =2;
Session["a"] = x;
x = 3;
var y = Session["a"];

y的最终值为2，使会话引用类型成为项.

y ends up with the value 2, making items in the Session reference types.

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