ASP.NET WebControl 和呈现包含的子项

发布于 2024-08-10 06:50:54 字数 798 浏览 8 评论 0原文

我希望创建一个可以在其中容纳标记的 WebControl，并自行动态创建子控件。我遇到的问题是，我（还）无法将标记中包含的控件（参见下面的示例）与我创建的子控件分开呈现。

我知道我需要使用这两个标志设置类：

[ParseChildren(false)]
[PersistChildren(true)]
public class OuterControl : WebControl
{
  ...
}

示例标记如下所示：

<custom:OuterControl>
  <asp:TextBox ...>
<custom:OuterControl>

在 RenderContents() 内，我需要将一些控件添加到控件树、渲染中，然后渲染包裹在特定部分的标记中的内容。例如：

protected override void RenderContents(HtmlTextWriter output)
{
  EnsureChildControls();
  [ Misc work, render my controls ]

  [** Would like to render wrapped children here **]

  [ Possibly other misc work ]
}

如上所述，我可以通过调用 RenderChildren() 让代码创建的控件呈现两次，或者通过删除该行来使包装的控件根本不呈现。该死。

想法？

原文

I'm looking to create a WebControl that can house markup inside it, and do its own dynamic creation of child controls. The issue I'm having is that I can't (yet) render the controls housed in the markup (see example below) separate from the child controls I create.

I'm aware I need to set up the class with these 2 flags:

[ParseChildren(false)]
[PersistChildren(true)]
public class OuterControl : WebControl
{
  ...
}

And sample markup would look like:

<custom:OuterControl>
  <asp:TextBox ...>
<custom:OuterControl>

Inside RenderContents(), I have some controls I need to add to the control tree, render, then render the ones wrapped in markup in a particular part. E.g.:

protected override void RenderContents(HtmlTextWriter output)
{
  EnsureChildControls();
  [ Misc work, render my controls ]

  [** Would like to render wrapped children here **]

  [ Possibly other misc work ]
}

As stated, I can either get my code-created controls to render twice from calling RenderChildren(), or the wrapped controls to not render at all by removing that line. Darn.

Thoughts?

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终难遇 2024-08-17 06:50:54

当我有类似的要求（围绕提供的控件构建一组标准控件）时，我最终做了这样的事情：

EnsureChildControls();

Control[] currentControls = new Control[Controls.Count];

if (HasControls()) {
  Controls.CopyTo(currentControls, 0);
  Controls.Clear();
}

// Misc work, add my controls, etc, e.g.
Panel contentBox = new Panel { ID = "Content", CssClass = "content_border" };
// at some point, add wrapped controls to a control collection
foreach (Control currentControl in currentControls) {
  contentBox.Controls.Add(currentControl);
}

// Finally, add new controls back into Control collection
Controls.Add(contentBox);

这已经保持得很好。

When I had a similar requirement (building a standard set of controls around the controls supplied), I ended up doing something like this:

EnsureChildControls();

Control[] currentControls = new Control[Controls.Count];

if (HasControls()) {
  Controls.CopyTo(currentControls, 0);
  Controls.Clear();
}

// Misc work, add my controls, etc, e.g.
Panel contentBox = new Panel { ID = "Content", CssClass = "content_border" };
// at some point, add wrapped controls to a control collection
foreach (Control currentControl in currentControls) {
  contentBox.Controls.Add(currentControl);
}

// Finally, add new controls back into Control collection
Controls.Add(contentBox);

Which has held up quite well.

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