我知道你可能已经解决了这一点,但这里要说的是母版页和MVC(和ASP.Net形式,以及)有效的解决方案。
我首先尝试覆盖母版页的Render方法,然后使用RenderControl渲染ContentPlaceHolders,并用渲染结果替换模板中的某些标记。这适用于ASP.Net表单,但不适用于MVC - 这种方式<% using (Html.BeginForm("A","B")) { %>
总是会导致在doctype之前在页面的顶部呈现表单标记。
解决方案
检索模板,并将其分割成其组成部分,有些是文字部分,有些是占位符部分。在您的母版页中,您有一个HTML文档和您的占位符 - 不仅是您的占位符。这样VS设计师就不会抱怨。但是,渲染时,首先清除Controls集合,然后将每个部分添加为LiteralControl或ContentPlaceHolder。您只需将实际渲染保留到ASP.Net。以下是灵感代码。
母版页:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title runat="server"></title>
<asp:PlaceHolder ID="HeadPlaceHolder" runat="server">
<script type="text/javascript" src="/cnnet/Resources/Js/jquery-1.8.1.min.js"></script>
</asp:PlaceHolder>
<asp:ContentPlaceHolder ID="HeadContentPlaceHolder" runat="server"/>
</head>
<body>
<asp:ContentPlaceHolder ID="MainContentPlaceHolder" runat="server" />
</body>
</html>
母版页的代码隐藏:
private HtmlHead originalPageHeader;
static readonly Regex HeadStartRegex = new Regex(@"^\s*<head[^>]*>");
static readonly Regex HeadEndRegex = new Regex(@"</head>\s*$");
static readonly Regex TitleRegex = new Regex(@"<title>[^<]*</title>");
public Default() { Init += Default_Init; }
private void Default_Init(object sender, EventArgs e) { DoScraping(); }
protected override void Render(HtmlTextWriter writer)
{
// get content from html head control generated via Page.Header:
string headHtml = RenderControl(originalPageHeader);
Controls.Remove(originalPageHeader);
headHtml = HeadStartRegex.Replace(headHtml, string.Empty);
headHtml = HeadEndRegex.Replace(headHtml, string.Empty);
headHtml = TitleRegex.Replace(headHtml, string.Empty);
// head.Controls.Add(new LiteralControl(headHtml)); doesnt work if head content placeholder contains code blocks (i.e. <% ... %>)
// Instead add content this way:
int headIndex = Controls.IndexOf(HeadContentPlaceHolder);
if (headIndex != -1)
Controls.AddAt(headIndex + 1, new LiteralControl(headHtml));
base.Render(writer);
}
private void DoScraping()
{
IList<PagePart> parts = ... // do your scraping and splitting into parts
Controls.Clear();
foreach (PagePart part in parts)
{
var literalPart = part as LiteralPart;
if (literalPart != null)
{
Controls.Add(new LiteralControl(literalPart.Text));
}
else
{
var placeHolderPart = part as PlaceHolderPart;
switch (placeHolderPart.Type)
{
case PlaceHolderType.Title:
Controls.Add(new LiteralControl(HttpUtility.HtmlEncode(Page.Title)));
break;
case PlaceHolderType.Head:
Controls.Add(HeadPlaceHolder);
Controls.Add(HeadContentPlaceHolder);
break;
case PlaceHolderType.Main:
Controls.Add(new LiteralControl("<div class='boxContent'>"));
Controls.Add(MainContentPlaceHolder);
Controls.Add(new LiteralControl("<div/>"));
break;
}
}
}
}
private string RenderControl(Control control)
{
string innerHtml;
using (var stringWriter = new StringWriter())
{
using (var writer = new HtmlTextWriter(stringWriter))
{
control.RenderControl(writer);
writer.Flush();
innerHtml = stringWriter.ToString();
}
}
return innerHtml;
}
配件:
public class PagePart {}
public class LiteralPart : PagePart
{
public LiteralPart(string text) { Text = text; }
public string Text { get; private set; }
}
public class PlaceHolderPart : PagePart
{
public PlaceHolderPart(PlaceHolderType type) { Type = type; }
public PlaceHolderType Type { get; private set; }
}
public enum PlaceHolderType { Title, Head, Main }
分裂:
class PlaceHolderInfo
{
public PlaceHolderInfo(PlaceHolderType type, Regex splitter)
{
Type = type;
Splitter = splitter;
}
public PlaceHolderType Type { get; private set; }
public Regex Splitter { get; private set; }
}
private static readonly List<PlaceHolderInfo> PlaceHolderInfos = new List<PlaceHolderInfo>
{
new PlaceHolderInfo(PlaceHolderType.Title, new Regex(TitleString)),
new PlaceHolderInfo(PlaceHolderType.Head, new Regex(HeadString)),
new PlaceHolderInfo(PlaceHolderType.Main, new Regex(MainString)),
};
private static List<PagePart> SplitPage(string html)
{
var parts = new List<PagePart>(new PagePart[] { new LiteralPart(html) });
foreach (PlaceHolderInfo info in placeHolderInfos)
{
var newParts = new List<PagePart>();
foreach (PagePart part in parts)
{
if (part is PlaceHolderPart)
{
newParts.Add(part);
}
else
{
var literalPart = (LiteralPart)part;
// Note about Regex.Split: if match is found in beginning or end of string, an empty string is returned in corresponding end of returned array.
string[] split = info.Splitter.Split(literalPart.Text);
for (int i = 0; i < split.Length; i++)
{
newParts.Add(new LiteralPart(split[i]));
if (i + 1 < split.Length) // If result of Split returned more than one string, it means there was a match and we insert the placeholder between each string
newParts.Add(new PlaceHolderPart(info.Type));
}
}
}
parts = newParts;
}
return parts;
}
请注意,此解决方案很容易扩展到更多占位符(面包屑,菜单,您的名称)。它不会假定模板中占位符的顺序或其存在的顺序。
编辑1: 我原来从Render
方法调用DoScraping
。事实证明,这是有问题的,因为它重新编制了Web表单中的控件名称(例如ctl00 $ MainContentPlaceHolder $ RequestingRepeater $ ctl01 $ ctl01)。它搞砸了数字到OnCommand
在中继器内的按钮停止工作的点。控件的重新排序必须尽可能早地发生,以避免这种情况,所以现在已将它移动到Init
。
编辑2: 某些页面使用Page.Header
生成样式和脚本标记。为了支持这个功能,我添加了一些黑客来保留原始<head>
标记并在渲染时插入生成的内容。
您好MrSharky - 不幸的是,这个问题(?)的范围太广泛,而且在您寻找的实际帮助方面还不太清楚。你描述了很多,但没有解释你在哪里遇到问题,你曾经尝试过什么,以及你需要什么样的帮助。 – Oded 2012-08-07 09:37:00
你可以在主页中使用文字吗?你可以将头部HTML细分,然后将其存储在一个字符串中,然后在主页面代码中设置literal = header头部 – dtsg 2012-08-07 09:37:28
@Oded道歉,目前这并不是什么问题,你是对的。我会编辑它以更具体一点。谢谢 – MrSharky 2012-08-07 10:05:05