ASP.NET RenderControl或RenderChildren失败 [英] ASP.NET RenderControl or RenderChildren fail

问题描述

我需要使用objChildControl.RenderControl或objControl.RenderChildren手动使我的子控件。但它看起来像这些方法都是不完整的。

I need to use objChildControl.RenderControl or objControl.RenderChildren to manually render my child controls. But it looks like these methods are incomplete.

我所有的子控件使用On preRender事件注册clientscript和客户端样式表（因为这些只能在prerender事件被创建）。

All my child controls use the OnPreRender event to register clientscript and client stylesheets (since these can only be created in the prerender event).

我有2个主要问题，传递当前System.Web.UI.Page对象对孩子的控制，并确保开preRender事件对这些子控件被解雇了。

I have 2 main issues, passing the current System.Web.UI.Page object to a child control and making sure the OnPreRender event is fired on these child controls.

看来，我不能用我的子控件的RenderControl方法，因为在preRender事件将不会被调用。
然而，我可以objChildControl.Page = Me.Page

It seems that I can't use the RenderControl method on my child controls since the OnPreRender event will not be called. I can however pass the Page object by objChildControl.Page = Me.Page

当我使用RenderChildren我无法通过Page对象，或可以吗？
我不知道当我使用RenderChildren开preRender事件甚至被称为

When I use RenderChildren I cannot pass the Page object, or can I? And i'm not sure if the OnPreRender event is even called when I use RenderChildren.

有些帮助将是AP preciated，因为我卡住;）

Some help would be appreciated, since i'm stuck ;)

更新

我找到了一种方法得到的结果，我需要，但它不是我想要的解决方案。
例如：

I found a way to get the result I need, but it is not the solution I want. Example:

code我想：

<wc:ParentControl id="objParent" runat="server" bla="etc">
<Content> <!-- This is an InnerProperty of the ParentControl --><DIV>bla bla bla bla.....<wc:SomeControl id="objSomeControl" runat="server" /><wc:3rdPartyControl id="obj3rdPartyControl" runat="server" /></DIV></Content>
</wc:ParentControl>

codeBehind：objParentControl.Content.RenderControl（作家）

CodeBehind: objParentControl.Content.RenderControl(Writer)

和则上述问题将开始。如何确保对内容中的所有孩子们在preRender会叫？

And then the issues mentioned above will begin. How to make sure that for all the children within Content the OnPreRender will be called?

code这不工作（但随后的RenderControl方法就是没用）：

Code which does work (but then the RenderControl method is just useless):

<wc:ParentControl id="objParentControl" runat="server"></wc:ParentControl>
<wc:Content id="objContent" runat="server"><DIV>bla bla bla bla.....<wc:SomeControl id="objSomeControl" runat="server" /><wc:3rdPartyControl id="obj3rdPartyControl" runat="server" /></DIV></wc:Content>

然后，只需使用对RenderBeginTag和RenderEndTag的WC的：内容控制。
然后，在preRender事件被调用。
但我wan't通过使用InnerProperty嵌入内容，存入parentcontrol。
然后手工绘制由RenderControl或RenderChildren的childcontrols。

Then just use the RenderBeginTag and RenderEndTag of the wc:Content control. Then the OnPreRender event is called. But I wan't to embed the content into the parentcontrol by using an InnerProperty. And then manually rendering the childcontrols by RenderControl or RenderChildren.

推荐答案

我有一个类似的问题。我不知道这是否是您遇到了同样的问题，但我遇到的问题是，我有一个 ParseChildren（真）我的容器控件的属性。因为ParseChildren是真实的，子控件会被放入一个属性，而不是到包含控件的子控件集合，并永远不会得到所谓的在preRender 功能

I had a similar issue. I'm not sure if it's the same issue you're experiencing, but the problem I was having was that I had a ParseChildren(true) attribute on my container control. Because ParseChildren was true, the child controls would be put into a property, rather than into the containing control's child controls collection, and would never get their OnPreRender function called.

我结束了覆盖在我的包含控制类，在这里我补充一切从我的分析收集到控制的CreateChildControls 函数集合。因为我反正重写渲染功能，我不担心Controls集合正在呈现时，我不想让他们成为控制。

I ended up overriding the CreateChildControls function in my containing control class, where I added everything from my parsed collection to the Controls collection. Because I'm overriding the Render function anyway, I don't worry about the controls in the Controls collection being rendered when I didn't want them to be.

喜欢的东西如下：

[ParseChildren(true, "MyKids")]
public class Example : Control {

	private ArrayList _kids = new ArrayList();

	public ArrayList MyKids {
		get { return _kids; }
		set { _kids = value; }
	}

	protected override CreateChildControls() {
		Controls.Clear();
		foreach(Control c in _kids)
			Controls.Add(c);
	}

	protected override Render(HtmlTextWriter writer) {
		...
	}
}

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