通过`EnableViewState`和`ViewStateMode`在asp.net 4.0减少viewstate-困惑 [英] Minimizing viewstate- confused by `EnableViewState` and `ViewStateMode` in asp.net 4.0

问题描述

我试图清理已启用ViewState中无处不在旧的ASP.NET WebForms的网站。这是一个性能问题 - 巨大的viewstates造成明显的延迟提交。但大多数的形式并不真正似乎需要的ViewState除了一些复杂的控制和放大器;表单数据。即使没有输入控件的形式，虽然，产生大viewstates因为我想asp.net是存放各种metatdata约每一个服务器控件。但是，可见性状态，等等，所以我觉得我可以消除很多是所有受控于code。

I'm trying to clean up an older ASP.NET WebForms site that has ViewState enabled everywhere. This is a performance issue - huge viewstates cause noticeable submit delays. But most of the forms don't really seem to need ViewState except for some complex control & form data. Even forms with no input controls, though, generate big viewstates because I guess asp.net is storing all kinds of metatdata about every single server control. But the visibility state, etc, is all controlled in code so I think I can eliminate a lot.

这是pretty繁重至的EnableViewState =false的添加到每个单独的控制（在一个页面，并在code创建）不需要它，所以我想在页面/控制水平来禁用它，并选择性地启用它需要它的东西。 （是的，我知道这是有风险的，但也有真的只是一对夫妇的大单和一对夫妇的模板，如果处理会带来很大的区别）。

It's pretty onerous to add EnableViewState="false" to every single control (in a page and created in code) that doesn't need it, so I'm trying to disable it at a page/control level, and selectively enable it for things that need it. (Yes, I realize this is risky, but there are really just a couple big forms and a couple templates that, if addressed would make a big difference).

下面就是我不太得到。

如果一个控件或页面有的EnableViewState =false的它的＆LT;％...％GT; 描述符，或者它的标签，其中它是在父页面，一切符创建的，因为在code添加任何ViewState的数据不起作用。所以，我似乎能够把它留在控制层启用，但设置的EnableViewState 为false，在每个容器包装的控制，然后设置 ViewStateMode =真（其中ovverrides了），在每个控制水平。

If a control or page has EnableViewState="false" it its <%.. %> descriptor, or in its tag where it is created in the parent page, everything breaks, because any ViewState data added in code doesn't work. So I seem to be able to leave it enabled at the control level, but set EnableViewState to false for a wrapper control in each container, and then set ViewStateMode=true (which ovverrides that) at a per-control level.

什么我没有变是发生了什么时：

What I'm not getting is what happens when:

ViewStateMode = ViewStateMode.Enabled 和
的EnableViewState = FALSE 为包含其他控件的控件。

ViewStateMode = ViewStateMode.Enabled and EnableViewState = false for a control that contains other controls.

有关控制。可以内控制与 ViewStateMode 仍处于启用状态？基本上，它设置有当他们发生冲突一锤定音？

for a control. Can inner controls be enabled still with ViewStateMode? Basically, which setting has the final word when they conflict?

有关每个容器，我希望能够在一个包装控件禁用一切，但仍然保证：

For each container, I want to be able to disable everything in a wrapper control but still ensure that:

1）在code工作的ViewState设置和

2）的 ViewState是为所有控件默认情况下禁用和

3）的我可以选择性地启用ViewState中的子控件。

这似乎是混杂。如果我在母版页的包装控制被设置为的EnableViewState =false的，但然后设置一个子控件为 ViewStateMode =启用 ，它打破。根据MS，ViewStateMode应该凌驾任何外ViewState的设置，但它似乎并没有工作。

This seems to be confounding. If I have a wrapper control in the master page that is set to EnableViewState="false", but then set a subcontrol to ViewStateMode="Enabled", it breaks. According to MS, ViewStateMode should supercede any outer ViewState settings, yet it doesn't seem to work.

推荐答案

由于每的上ViewStateMode MSDN文章 ViewStateMode 才有意义时，的EnableViewState =真正的。为了达到你想要什么，你必须离开 ViewStateMode =已启用上的控制，然后敷主一身的子控件在 ASP：占位符有 ViewStateMode =已禁用。这样的话，你仍然可以操纵的ViewState在codebehind，但没有孩子的控制将有ViewState的（除非你明确地设置有它的那些通过 ViewStateMode =已启用）。

As per the MSDN article on ViewStateMode, ViewStateMode only has meaning when EnableViewState="true". To achieve what you want, you'll have to leave ViewStateMode="Enabled" on the control, and then wrap the sub-controls of the main one in an asp:Placeholder that has ViewStateMode="Disabled". That way, you can still manipulate ViewState in the codebehind, but no child control will have ViewState (except the ones you explicitly set to have it via ViewStateMode="Enabled").

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