ASP.NET 中的动态加载控件和持久性
我正在 Page_Load 事件中加载一系列控件。但是，我必须在每次页面加载时重新创建这些控件，这意味着将它们的数据存储在其他地方。这很麻烦。
protected void Page_Load(object sender, EventArgs e)
{
MyControl control = (MyControl)LoadControl(...);
control.Initialize(GlobalClass.controlData);
//^gives the control the data it had previously.
//Or use ViewState["controlData"] if serializable.
Controls.Add(control);
}
我觉得我应该使用 if (!IsPostBack) {}，但我不知道如何使用，也不知道为什么。
相反，如果我将控件放入标记中，那么控件似乎会保持持久性。例如，标记中的按钮将记住对其 Text 属性的任何更改（我认为？）。
<asp:Button ID="buttonText" runat="server"
Text="Text Segment" onclick="buttonText_Click" />
如何通过动态添加的控件（例如通过标记添加的控件）保持某种持久性？这将为我节省很多工作和挫败感。
谢谢。
（我已经编写了一小段时间的代码，但是我做的 ASP.NET 越多，我就越困惑。这与我对学习工作的理解完全相反:-P。）
I am loading a series of controls in the Page_Load event. However, I have to recreate those controls each page load, which means storing their data elsewhere. This is cumbersome.
protected void Page_Load(object sender, EventArgs e)
{
MyControl control = (MyControl)LoadControl(...);
control.Initialize(GlobalClass.controlData);
//^gives the control the data it had previously.
//Or use ViewState["controlData"] if serializable.
Controls.Add(control);
}
I feel like I should be using if (!IsPostBack) {}, but I don't know how, or why.
In contrast, if I place the controls into the markup, then the controls seem to stay persistent. For example, a button in mark-up will remember any changes to its Text property (I think?).
<asp:Button ID="buttonText" runat="server"
Text="Text Segment" onclick="buttonText_Click" />
How do I maintain some sort of persistence with dynamically added controls, like controls added via mark-up? This would save me much work and frustration.
Thanks.
(I've coded for a small eternity, but the more I do ASP.NET, the more confused I become. Which is exactly the opposite of what how I understood learning to work :-P.)
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对于动态加载的控件，如果在 Page_Init 事件期间加载它们，则可以将它们添加到 ViewState，并且它们将能够保留从 PostBack 到 PostBack 的状态。
For dynamically loaded controls, if you load them during the Page_Init event, you can then add them to the ViewState and they will be able to retain state from PostBack to PostBack.
我明白你的意思。是的，这很麻烦，但这就是无状态技术的工作原理。
没有办法实现与静态控件（放入 HTML 标记中的控件）相同的行为。
按照我在此答案中给出的提示进行操作：
访问动态创建的控件 (c#)
I understand your point. Yes, this is cumbersome, but that's how a stateless technology works.
There's no way of achieving the same bahaviour of static controls (the ones that you put in the HTML markup).
Follow the tips I gave in this answer:
Accessing controls created dynamically (c#)