我最近遇到了同樣的問題，並且在尋找答案時發現大多數解決方案都圍繞着源數據進行了旋轉。
我想到問題不在於源數據，而在於我們想要呈現它的方式。雖然上面的Chris的回答確實會改變我在我的需求中找到的渲染點的數據，如果我需要模板化的網格視圖，它的靈活性不夠。那麼它發生了，或許更好的解決方案是捕獲一個網格的表格HTML標記並改變它 - 這實際上意味着該解決方案可以應用於任何呈現表格標記的控件，並且包含任何模板控件在它內部將繼續工作。
由於時間壓力，我只使用網格視圖實現解決方案;我最初想做一個模板服務器控件，如果有任何控件放在它內部，它將檢查它的標記輸出並且使其中包含的任何表格都可以）支持
無論如何，這是實現網格視圖解決方案所需的代碼。
自定義服務器控件的代碼
[ToolboxData("<{0}:PivotGridView runat=server></{0}:PivotGridView>")]
public class PivotGridView : GridView
{
bool _pivotGrid = true;
[Browsable(true)]
public bool PivotGrid
{
get
{
return _pivotGrid;
}
set
{
_pivotGrid = value;
EnsureChildControls();
}
}
protected override void RenderContents(HtmlTextWriter output)
{
if (_pivotGrid)
{
System.IO.TextWriter baseOutputTextWriter = new System.IO.StringWriter();
HtmlTextWriter baseOutputHtmlWriter = new HtmlTextWriter(baseOutputTextWriter);
base.RenderContents(baseOutputHtmlWriter);
output.Write(HtmlParserService.PivotHtmlTableMarkup(baseOutputTextWriter.ToString()));
}
else
{
base.RenderContents(output);
}
}
}
HTML解析器服務代碼中分離出來，便於實施的其他地方。
//... using System.Text.RegularExpressions;
public static class HtmlParserService
{
/// <summary>
/// Takes HTML markup locates any table definition held within it and returns that
/// markup with the table HTML pivotted
/// </summary>
/// <param name="html"></param>
/// <returns></returns>
public static string PivotHtmlTableMarkup(string html)
{
html = ReplaceShorthandTableTags(html);
int openingTableTagIndex;
string openingTableTagText;
int closingTableTagIndex;
string tableContentText;
tableContentText = GetTagContentText("table", html, out openingTableTagIndex, out openingTableTagText, out closingTableTagIndex);
MatchCollection rows = GetTagMatches("tr", tableContentText);
if (rows.Count > 0)
{
MatchCollection columns = GetTagMatches("(td|th)", rows[0].Value);
StringBuilder pivottedTableMarkup = new StringBuilder();
for (int i = 0; i < columns.Count; i++)
{
pivottedTableMarkup.Append("<tr>");
foreach (Match row in rows)
{
if (row.Value.Length > 0)
{
columns = GetTagMatches("(td|th)", row.Value);
if (columns.Count>i)
{
pivottedTableMarkup.Append(columns[i].Value);
}
}
}
pivottedTableMarkup.Append("</tr>");
}
string preTableText = "";
if (openingTableTagIndex > 1)
{
preTableText = html.Substring(1, openingTableTagIndex);
}
string postTableText;
postTableText = html.Substring(closingTableTagIndex, html.Length - closingTableTagIndex);
string newHtmlWithPivottedTable;
newHtmlWithPivottedTable = preTableText + openingTableTagText + pivottedTableMarkup.ToString() + postTableText;
return newHtmlWithPivottedTable;
}
else
{
return html;
}
}
/// <summary>
/// Gets the content between the specified tag.
/// </summary>
/// <param name="tag">The tag excluding any markup (e.g. "table" not "<table>"</param>
/// <param name="text">The xml text string to extract content from</param>
/// <param name="openingTagIndex">Outputs the indexed position of the opening tag</param>
/// <param name="openingTagText">Outputs the definition of the tag, e.g. it's attributes etc</param>
/// <param name="closingTagIndex">Outputs the indexed position of the closing tag</param>
/// <returns></returns>
public static string GetTagContentText(string tag, string text, out int openingTagIndex, out string openingTagText, out int closingTagIndex)
{
string contentText;
openingTagIndex = text.ToLower().IndexOf("<" + tag);
openingTagText = text.Substring(openingTagIndex, text.IndexOf(">", openingTagIndex) - openingTagIndex+1);
closingTagIndex = text.ToLower().LastIndexOf("</" + tag + ">");
contentText = text.Substring(
openingTagIndex + openingTagText.Length,
closingTagIndex - (openingTagIndex + openingTagText.Length));
return contentText;
}
/// <summary>
/// Returns a collection of matches containing the content of each matched tag
/// </summary>
/// <param name="tag">HTML tag to match. Exclude opening and close angled braces.
/// Multiple tags can be matched by specifying them in the following format (tag1|tag2),
/// e.g. (td|th)</param>
/// <param name="html"></param>
/// <returns></returns>
public static MatchCollection GetTagMatches(string tag, string html)
{
Regex regexp = new Regex(@"<" + tag + @"\b[^>]*>(.*?)</" + tag + @">", RegexOptions.IgnoreCase | RegexOptions.Singleline);
return regexp.Matches(html);
}
/// <summary>
/// Ensures any shorthand XML tags are full expressed, e.g.
/// <td/> is converted to <td></td>
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
private static string ReplaceShorthandTableTags(string value)
{
value=value.Replace("<tr/>", "<tr></tr>");
value=value.Replace("<td/>", "<td></td>");
value=value.Replace("<th/>", "<th></th>");
return value;
}
}
這不是一個壞建議。我一直想讓自己學習如何在一段時間內構建一個模板控件。 :) – 2009-10-07 18:39:58