将XhtmlTextWriter与XmlTextReader一起使用

Annie 发表于 Dev

安妮

阅读本文后，我决定使用以下代码更新以下代码（使用XmlDocument）XmlReader：

渲染控件

public string Rendering(Control baseControl)
{
    StringBuilder stringBuilder = new StringBuilder();

    using (StringWriter stringWriter = new StringWriter(stringBuilder))
    using (XhtmlTextWriter htmlWriter = new XhtmlTextWriter(stringWriter))
    {
        baseControl.RenderControl(htmlWriter);

        return PretifyWithNewlines(stringBuilder.ToString());
    }
}

在每个节点之后添加换行符

private string PretifyWithNewlines(string minifiedMarkup)
{   
    XmlDocument xmlDocument = new XmlDocument();
    xmlDocument.XmlResolver = null;

    try
    {
        xmlDocument.LoadXml("<base>" + minifiedMarkup + "</base>");
    }
    catch // when minifiedMarkup contains the whole HTML with DTD tag defined, 
    {                                    // it throws an exception with <base>
        xmlDocument.LoadXml(minifiedMarkup);
    }

    return recursiveOperation(xmlDocument.ChildNodes)
           .Replace(Environment.NewLine + Environment.NewLine, Environment.NewLine)
           .Replace(Environment.NewLine + "<base>" + Environment.NewLine, "")
           .Replace(Environment.NewLine + "</base>" + Environment.NewLine, "");

}

递归遍历每个节点并植入新元素

private static string recursiveOperation(XmlNodeList xmlNodeList)
{
    string result = "";

    foreach (XmlNode currentNode in xmlNodeList)
    {
        XmlNode clonedNode = currentNode;

        string interimMarkup = recursiveOperation(currentNode.ChildNodes);
        try
        {
            clonedNode.InnerXml = interimMarkup;
        }
        finally
        {
            result += Environment.NewLine + clonedNode.OuterXml + Environment.NewLine;
        }
    }
    return result;
}

问题：

是否有优化现有代码的空间？
我怎么会去直接实例XmlTextReader从Control，StringWriter或XhtmlTextWriter对象？还是我真的需要先渲染string然后实例化XmlTextReader？

编辑

根据Jon Skeet的回答，这是更新。这个想法是在每个元素之后插入一个换行符：

美化之前：

<div class="tag"><span>text<span class="another-span"></span></span></div><div>Text<img src="some/relative/URL/" />namely</div>

美化之后：

 <div class="tag">
 <span>
 text
 <span class="another-span"></span>
 </span>
 </div>
 <div>
 Text
 <img src="some/relative/URL/" />
 namely
 </div>

请注意，span.another-span当其他所有内容（带有子节点）扩展时，keep如何折叠。缩进将由Visual Studio声明。

乔恩·斯基特

是否有优化现有代码的空间？

绝对。我要更改的第一位与XML的加载方式无关-它是字符串连接。我会将您的recursiveOperation方法更改为：

private static string RecursiveOperation(XmlNodeList xmlNodeList)
{
    StringBuilder result = new StringBuilder();

    foreach (XmlNode currentNode in xmlNodeList)
    {
        XmlNode clonedNode = currentNode;

        // Remove try/finally block - if an exception is thrown your
        // result will be lost anyway
        string interimMarkup = RecursiveOperation(currentNode.ChildNodes);
        clonedNode.InnerXml = interimMarkup;
        result.Append(Environment.NewLine)
              .Append(clonedNode.OuterXml)
              .Append(Environment.NewLine);
    }
    return result.ToString();
}