什么时候需要使用的ViewState [英] When do I need to use ViewState
问题描述
我很困惑于如何使用的ViewState
在C#中,例如什么是使用的好处:
的ViewState [VST] =值1;
Lable1.Text =的ViewState [VST]的ToString()。
虽然我可以使用:
字符串容器=值1;
Lable1.Text =容器;
您ViewState中包含的保持与后背上你的页面的变量,因为它们被发送到客户端和客户端发送回与整个页。
因此,如果你做的:
字符串容器=值1;
Lable1.Text =容器;
那么用户看到的页面,并点击提交按钮,你的容器
字符串将不存在了。
然而,如果你使用的ViewState,的ViewState [VST]将仍然具有价值,因为它会被刷新当用户提交并发送页面返回。
了解更多这里也明白了ASP.NET页面的生命循环。
I am confused in how to use ViewState
in C#, for example what is the benefit of using:
ViewState["VST"]="Value1";
Lable1.Text= ViewState["VST"].ToString();
Whereas I can use:
string container= "Value1";
Lable1.Text= container;
Your ViewState consists of variables that are kept with the post-backs of your page, because they are sent to the client and the client sends them back with the entire page.
Hence, if you do:
string container= "Value1";
Lable1.Text= container;
Then the users sees the page and hits the submit button, your container
string will not exist.
If however you uses the ViewState, ViewState["VST"] will still have the value as it will be "refreshed" when the user submits and sends the page back.
Read more here and also understand the ASP.NET page life cycle.
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