保留控件的属性

发布于 2024-10-14 10:29:05 字数 417 浏览 6 评论 0原文

好吧，是时候问你另一个愚蠢的问题了。

我有一个控件，它有一些需要保留在 ViewState 中的属性。我还需要确保如果控件在页面上出现多次，属性不会被覆盖。

我想写一些类似...

ViewState[String.Format("{0}_{1}", "BaseKey", this.ClientID)] = ...

但是 ClientID 的值在页面生命周期的中途发生变化。它开始时类似于“MyControl1”，然后变成“ctl001_MyControl1”。因此，在更改之前应用的任何值都会丢失。

如果我使用 UniqueID 代替，也会发生同样的事情。

我知道我错过了一些明显的东西，我会把责任归咎于我正在服用的药物，这样我就不会看起来太愚蠢了。

-- 斯图尔特

原文

OK Time for another dumb Q from yours truly.

I have a control that has some properties that need to be persisted in the ViewState. I also need to make sure that the properties aren't overwritten if the control appears more than once on the page.

I thought to write something like...

ViewState[String.Format("{0}_{1}", "BaseKey", this.ClientID)] = ...

But the value of ClientID changes partway through the page's lifecycle. It starts out as something like "MyControl1" and then becomes "ctl001_MyControl1". So any values applied before it changes are lost.

The same thing happens if I use UniqueID instead.

I know I'm missing something obvious, and I'm going to blame the pills I'm taking so I don't look too dumb.

--
Stuart

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め七分饶幸 2024-10-21 10:29:05

看起来您是在用户控件内部执行此操作，如果这是真的，您不需要为视图状态创建唯一的密钥，每个控件的每个实例都管理它自己的视图状态，因此您所需要的只是控件已知的密钥，像这样的东西：

ViewState[@"somekey"] = ...

it looks like you are doing this inside the user control, if that is true you do not need to make a unique key for the viewstate, each instance of every control manages it's own viewstate so all you need is a key known to your control, something like that:

ViewState[@"somekey"] = ...

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水溶 2024-10-21 10:29:05

尝试在 Page_PreRender 而不是 Page_Load 上执行此操作？

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凉城凉梦凉人心 2024-10-21 10:29:05

不要存储相对于控件本身的输出名称命名的值。为其提供一个唯一的、不变的名称，然后确保所有绑定规则都调整为该名称而不是客户端名称。

编辑：
作为我的意思的一个小例子：

MyControl ctrl1 = new MyControl();
ctrl1.ID = "MyControlA";
ctrl1.Text = "Some text";
ViewState[ctrl1.ID] = ctrl1.Text;

MyControl ctrl2 = new MyControl();
ctrl2.ID = "MyControlB";
ctrl2.Text = "Some other text";
ViewState[ctrl2.ID] = ctrl2.Text;

Don't store the value named relative to the output name of the control itself. Provide it with a unique, unchanging name and then make sure all of your binding rules adjust to that name instead of the client name.

Edit:
As a small example of what I mean:

MyControl ctrl1 = new MyControl();
ctrl1.ID = "MyControlA";
ctrl1.Text = "Some text";
ViewState[ctrl1.ID] = ctrl1.Text;

MyControl ctrl2 = new MyControl();
ctrl2.ID = "MyControlB";
ctrl2.Text = "Some other text";
ViewState[ctrl2.ID] = ctrl2.Text;

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