如何将ListT转换相应的Html（xsl动态转换）（二）
緊跟著上一篇隨筆，本文主要涉及到如何將xml與xsl動(dòng)態(tài)轉(zhuǎn)換成html，這個(gè)才是最關(guān)鍵的地方，所有的內(nèi)容都是圍繞這個(gè)主題來(lái)進(jìn)行開(kāi)展的。根據(jù)指定的xsl樣式將List<T>轉(zhuǎn)換相應(yīng)的Html，相關(guān)的隨筆如下：
（一）、將List<T>轉(zhuǎn)換成DataTable。
（二）、將Xml與Xsl動(dòng)態(tài)轉(zhuǎn)換成Html。
（三）、設(shè)置以及控制Xsl的內(nèi)容樣式。
?
二、XslTransform的具體實(shí)現(xiàn)
XslTransform主要的職責(zé)為：將xml與xsl動(dòng)態(tài)轉(zhuǎn)換成html。其中，XslCompiledTransform?提供了很多方法可以進(jìn)行相關(guān)的轉(zhuǎn)換，但使用起來(lái)并不是十分方便，因此必須在該基礎(chǔ)上來(lái)對(duì)目前的類進(jìn)行相關(guān)封裝以及提取。具體的代碼如下：
?1?????public?class?XslTransform?:?IDisposable?2?????{
?3?????????public?StringWriter?StringWriter
?4?????????{
?5?????????????get;
?6?????????????private?set;
?7?????????}
?8?
?9?????????public?StringReader?XmlStringReader
10?????????{
11?????????????get;
12?????????????private?set;
13?????????}
14?
15?????????public?StringReader?XslStringReader
16?????????{
17?????????????get;
18?????????????private?set;
19?????????}
20?
21?????????public?XslTransform()
22?????????{
23?????????????this.StringWriter?=?new?StringWriter();
24?????????}
25?
26?????????public?string?Transfer(string?xmlText,?string?xslText)
27?????????{
28?????????????if?(string.IsNullOrWhiteSpace(xmlText)
29?????????????????||?string.IsNullOrWhiteSpace(xslText))
30?????????????{
31?????????????????return?string.Empty;
32?????????????}
33?????????????this.XmlStringReader?=?new?StringReader(xmlText);
34?????????????this.XslStringReader?=?new?StringReader(xslText);
35?
36?????????????return?TransferXmlAndXslToHtml();
37?????????}
38?
39?????????private?string?TransferXmlAndXslToHtml()
40?????????{
41?????????????try
42?????????????{
43?????????????????using?(XmlTextWriter?writer?=?new?XmlTextWriter(this.StringWriter))
44?????????????????{
45?????????????????????return?ToHtml(writer);
46?????????????????}
47?????????????}
48?????????????catch
49?????????????{
50?????????????????return?string.Empty;
51?????????????}
52?????????}
53?
54?????????private?string?ToHtml(XmlTextWriter?writer)
55?????????{
56?????????????XslCompiledTransform?xslTransform?=?new?XslCompiledTransform();
57?????????????xslTransform.Load(XmlReader.Create(this.XslStringReader));
58?????????????xslTransform.Transform(XmlReader.Create(this.XmlStringReader),?writer);
59?????????????
60?????????????return?this.StringWriter.ToString();
61?????????}
62?
63?????????#region?IDisposable?成員
64?
65?????????public?void?Dispose()
66?????????{
67?????????????this.Dispose(true);
68?????????????GC.SuppressFinalize(this);
69?????????}
70?
71?????????private?void?Dispose(bool?disposing)?
72?????????{
73?????????????if?(this.StringWriter?!=?null)
74?????????????{
75?????????????????this.StringWriter.Dispose();
76?????????????}
77?????????????if?(this.XslStringReader?!=?null)
78?????????????{
79?????????????????this.XslStringReader.Dispose();
80?????????????}
81?????????????if?(this.XmlStringReader?!=?null)
82?????????????{
83?????????????????this.XmlStringReader.Dispose();
84?????????????}
85?????????}
86?
87?????????#endregion
88?????}
?
?XslTransform?類主要的方法為54-61行的代碼，如下所示：
54?????????private?string?ToHtml(XmlTextWriter?writer)
55?????????{
56?????????????XslCompiledTransform?xslTransform?=?new?XslCompiledTransform();
57?????????????xslTransform.Load(XmlReader.Create(this.XslStringReader));
58?????????????xslTransform.Transform(XmlReader.Create(this.XmlStringReader),?writer);
59?????????????
60?????????????return?this.StringWriter.ToString();
61?????????}
第57行加載XSL的樣式文本，58行在原有基礎(chǔ)上將XML轉(zhuǎn)換成XmlTextWriter對(duì)象。其中XmlTextWriter在初始化時(shí)，StringWriter對(duì)象作為參數(shù)傳遞進(jìn)去，如以下的43行代碼：
43?????????????????using?(XmlTextWriter?writer?=?new?XmlTextWriter(this.StringWriter))
因此直接返回this.StringWriter.ToString();就獲取到了我們所需的Html了。
?
其次，XslTransform?類還有一個(gè)注意的要點(diǎn)：實(shí)現(xiàn)IDisposable接口主要是將用到的資源及時(shí)釋放掉，避免造成其他影響。
三、Xsl文件的設(shè)置以及添加到資源文件中
?（1）創(chuàng)建MapperInfoXslContent.xslt樣式文件，內(nèi)容如下（目前使用最簡(jiǎn)單的，不做任何處理的樣式文件）：
View Code <?xml?version="1.0"?encoding="utf-8"?><xsl:stylesheet?version="1.0"?xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
??<xsl:template?match="/">?
????<html>
??????<head>
????????<title>demo</title>
??????</head>
??????<body>
????????<table>
??????????<tr>
????????????<td>
??????????????<table?border="1px"?bordercolor="#000000"?cellspacing="0px"?style="border-collapse:collapse">
????????????????<tr?bgcolor="#9acd32">
??????????????????<th?width="80">Name</th>
??????????????????<th?width="80">Value</th>
??????????????????<th?width="80">Percent</th>
??????????????????<th?width="230">CreatedTime</th>
??????????????????<th?width="60">IsActive</th>
??????????????????<th?width="190">TargerUrl</th>
????????????????</tr>
????????????????<xsl:for-each?select="DataSet/MapperInfo">
??????????????????<tr>
????????????????????<td?bgcolor="#ff00ff"?width="80">
??????????????????????<xsl:value-of?select="Name"/>
????????????????????</td>
????????????????????<td?width="80">
??????????????????????<xsl:value-of?select="Value"/>
????????????????????</td>
????????????????????<td?bgcolor="#ff00ff"?width="80">
??????????????????????<xsl:value-of?select="Percent"/>
????????????????????</td>
????????????????????<td?width="230">
??????????????????????<xsl:value-of?select="CreatedTime"/>
????????????????????</td>
????????????????????<td?bgcolor="#ff00ff"?width="60">
??????????????????????<xsl:value-of?select="IsActive"/>
????????????????????</td>
????????????????????<td?width="190">
??????????????????????<xsl:value-of?select="TargetUrl"/>
????????????????????</td>
??????????????????</tr>
????????????????</xsl:for-each>
??????????????</table>
????????????</td>
??????????</tr>
????????</table>
??????</body>
????</html>
??</xsl:template>
</xsl:stylesheet>
?
?
（2）然后再創(chuàng)建XslResource.resx資源文件，將MapperInfoXslContent.xslt樣式文件添加到XslResource.resx資源文件中，如下圖所示：
?
四、轉(zhuǎn)換后的效果?
經(jīng)過(guò)轉(zhuǎn)換后得到的Html顯示效果如下（測(cè)試過(guò)程中可以以HTML格式來(lái)查看字符串）：
?
五、相關(guān)的單元測(cè)試
?示例的單元測(cè)試代碼如下（僅做了一些最基礎(chǔ)的測(cè)試，驗(yàn)證內(nèi)容是否存在）：
View Code ??????? [TestMethod()]????????public?void?TransferTest()
????????{
????????????string?xmlText?=?GetXmlText();
????????????string?xslText?=?XslResource.MapperInfoXslContent;
????????????string?htmlContent?=?string.Empty;
????????????using?(XslTransform?xslTransform?=?new?XslTransform())
????????????{
????????????????htmlContent?=?xslTransform.Transfer(xmlText,?xslText);
????????????}
????????????Assert.IsTrue(!string.IsNullOrWhiteSpace(htmlContent));
????????????Assert.IsTrue(htmlContent.Contains("true"));
????????????Assert.IsTrue(htmlContent.Contains("false"));
????????????
????????????for?(int?index?=?0;?index?<?3;?index++)
????????????{
????????????????Assert.IsTrue(htmlContent.Contains(
????????????????????string.Concat("MapperInfoIndex",?index.ToString())));
????????????????Assert.IsTrue(htmlContent.Contains(
????????????????????string.Format(@"www.codeplex.com?Id={0}",?index)));
????????????????Assert.IsTrue(htmlContent.Contains(index.ToString()));
????????????}??????????
????????}
????????private?string?GetXmlText()
????????{
????????????List<MapperInfo>?entities?=?CreateMapperInfos(3);
????????????DataTable?dataTable?=?EntityMapper.ToDataTable<MapperInfo>(entities);
????????????DataSet?dataSet?=?new?DataSet("DataSet");
????????????dataSet.Tables.Add(dataTable);
????????????return?dataSet.GetXml();
????????}
????????private?List<MapperInfo>?CreateMapperInfos(int?count)
????????{
????????????List<MapperInfo>?entities?=?new?List<MapperInfo>();
????????????for?(int?index?=?0;?index?<?count;?index++)
????????????{
????????????????entities.Add(new?MapperInfo()
????????????????{
????????????????????Name?=?string.Concat("MapperInfoIndex",?index.ToString()),
????????????????????IsActive?=?(index?%?2?==?0???true?:?false),
????????????????????CreatedTime?=?DateTime.Now,
????????????????????Value?=?index,
????????????????????Percent?=?GetPercent(index),
????????????????????TargetUrl?=?string.Format(@"www.codeplex.com?Id={0}",?index)
????????????????});
????????????}
????????????return?entities;
????????}
????????private?decimal??GetPercent(int?index)
????????{
????????????if?(index?%?2?==?0)
????????????{
????????????????return?index;
????????????}
????????????return?null;
????????}
?
六、總結(jié)
上面涉及的僅僅是其中的一種，代碼應(yīng)該是比較精簡(jiǎn)的。還有另外一種采用XPathNavigator的，也就是笛子說(shuō)的：“如果使用 XmlWriter 或 XmlDocument，則可以避開(kāi)這個(gè)問(wèn)題。另外，XslCompiledTransform.Transform 方法重載了幾個(gè)版本中，如果我沒(méi)記錯(cuò)的話，最應(yīng)優(yōu)先使用的是xml數(shù)據(jù)源為 XPathNavigator 的版本。”。關(guān)于這種情況，可以通過(guò)XmlDocument來(lái)創(chuàng)建相關(guān)的XPathNavigator對(duì)象，即：XPathNavigator navigator = XmlDocument.DocumentElement.CreateNavigator()，這種版本的我也重寫了一份，但是好像沒(méi)有轉(zhuǎn)換成功，因此就采用這種模式了。下一篇主要涉及到XSL樣式的設(shè)計(jì)以及相關(guān)的函數(shù)、模板的應(yīng)用。
轉(zhuǎn)載于:https://www.cnblogs.com/aaa6818162/archive/2011/05/27/2060134.html
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