小编use*_*349的帖子

我收到'xsi'是使用XmlDocument的未声明的前缀.

我正在尝试读取具有以下架构的文件:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2"
     xmlns:gx="http://www.google.com/kml/ext/2.2" 
     xmlns:kml="http://www.opengis.net/kml/2.2"
     xmlns:atom="http://www.w3.org/2005/Atom">
        <Document>
            <Document id="robert" xsi:schemaLocation="http://www.opengis.net/kml/2.2 http://schemas.opengis.net/kml/2.2.0/ogckml22.xsd http://www.google.com/kml/ext/2.2 http://code.google.com/apis/kml/schema/kml22gx.xsd">
              <Placemark>
                <description>test</description>
              </Placemark>
        </Document>
    </Document>
</kml>

我尝试过以下方法:

    XmlDocument xmldoc = new XmlDocument();
    using (XmlTextReader tr = new XmlTextReader(strXmlFile))
    {
        //tr.Namespaces = false; (uncomment to ignore namespace)
        xmldoc.Load(tr);  // 'xsi' is an undeclared prefix error here
    }

如果我取消注释该行以忽略命名空间,它会加载正常但无法保存XmlDocument以后.所以忽略它不会是一个解决方案.有谁知道如何正确加载架构？问题/错误似乎在此节点中:

<Document id="robert" xsi:schemaLocation="http://www.opengis.net/kml/2.2 http://schemas.opengis.net/kml/2.2.0/ogckml22.xsd http://www.google.com/kml/ext/2.2 http://code.google.com/apis/kml/schema/kml22gx.xsd">

更新#1 我尝试了以下内容:

XmlDocument xmldoc = new XmlDocument();
NameTable nt = new NameTable();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);
nsmgr.AddNamespace("xsi", …

我正在尝试使用XmlNamespaceManager将命名空间添加到XmlDocument.这是当前的xml:

<?xml version="1.0"?>
<kml>
  <Document>
    <Placemark>
    </Placemark>
  </Document>
</kml>

我希望它转换为这个xml(使用XmlNamespaceManager):

<?xml version="1.0"?>
<kml xmlns="http://www.opengis.net/kml/2.2"
     xmlns:gx="http://www.google.com/kml/ext/2.2" 
     xmlns:kml="http://www.opengis.net/kml/2.2"
     xmlns:atom="http://www.w3.org/2005/Atom"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Document>
    <Placemark>
    </Placemark>
  </Document>
</kml>

但我无法更改xml.这是代码,我知道它应该是一个简单的修复:

public void addXmlns()
        {

            string xml = @"<?xml version=""1.0""?>
                    <kml>
                    <Document>
                    <Placemark>
                    </Placemark>
                    </Document>
                    </kml>";

            var xmldoc = new XmlDocument();

            xmldoc.LoadXml(xml);

            XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmldoc.NameTable);

            //Add the namespaces
            nsmgr.AddNamespace("", "http://www.opengis.net/kml/2.2");
            nsmgr.AddNamespace("gx", "http://www.google.com/kml/ext/2.2");
            nsmgr.AddNamespace("kml", "http://www.opengis.net/kml/2.2");
            nsmgr.AddNamespace("atom", "http://www.w3.org/2005/Atom");
            nsmgr.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");

            string message;
            message = xmldoc.InnerXml;

            MessageBox.Show(message); // still shows the original xml

        }

先谢谢你

更新#1 - 试过这个,但它也不会改变XML: …

我正在尝试使用HtmlAgilityPack更新外部Html.该属性显示为只读.我的问题是如何更新外部Html？注意:我确实需要更新外部html(不仅仅是内部html).这是代码:

// Check if there is a nested table
HtmlAgilityPack.HtmlNode nestedtable = tr.SelectSingleNode(".//table");
if (nestedtable != null)
{
    // Save Inner/Outer Html and update Outer Html
    string strInnerHtml = nestedtable.InnerHtml;
    string strOuterHtml = nestedtable.OuterHtml;
    string strNewOuterHtml = "<table><tr><td><table><tr><td>inner1update</td><td>inner2update</td></tr></table></td></tr></table>";

    // Now update source HtmlDocument
    nestedtable.OuterHtml = strNewOuterHtml;  
    // ^^^ Error line: Property or indexer  
    //HtmlAgilityPack.HtmlNode.OuterHtml' cannot be assigned to -- it is read only
}