大家想必一定都了解XML利用XML技术来存储数据和文档是一件很容易的事情NET Framework 在它的命名空间SystemXml 就提供了一种可以很方便的操作xml的类XmlDocument它使用起来非常容易XmlDocument 其实就是一个简单的树下面详细的介绍XmlDocument 的使用方法
下面是这个类中操作节点的常用方法
// create a new node in the document object from the source node
//and name it as sName
// the return value indicates success or failure
public bool AddNode(XmlNode oSource String sName);
// same as above except that it also specifies the parent node of the
// newly created node
// the return value indicates success or failure (returns false if the
// parent node does not exist)
public bool AddNode(XmlNode oSource String sName String sParent);
// create a set of new nodes in the document object from the source node
// list and name them as sName
// the return value indicates success or failure
public bool AddNodes(XmlNodeList oSourceList String sName);
// same as above except that it also specifies the parent node of the
// newly created nodes the return value indicates success or failure
// (returns false if the parent node
// does not exist)
public bool AddNodes(XmlNodeList oSourceList String sName String sParent);
// merge the source node into a node named sName in the document object
// the node named sName will be created if it does not exist
// the return value indicates success or failure
public bool MergeNode(XmlNode oSource String sName);
// same as above except that it also specifies the parent node of the merged node
// the return value indicates success or failure (returns false if the parent node
// does not exist)
public bool MergeNode(XmlNode oSource String sName String sParent);
下面我们给一个增加节点的例子
docVechilexml
<VehicleData>
<Record>
<id></id>
<make>Ford</make>
<model>Escort</model>
<year></year>
</Record>
<Record>
<id></id>
<make>Toyota</make>
<model>Tercel</model>
<year></year>
</Record>
<Record>
<id></id>
<make>Mazda</make>
<model>GLC</model>
<year></year>
</Record>
</VehicleData>
docDriverxml
<DriverData>
<Record>
<id></id>
<firstname>Albert</firstname>
<lastname>Einstein</lastname>
</Record>
<Record>
<id></id>
<firstname>Clint</firstname>
<lastname>Eastwood</lastname>
</Record>
<Record>
<id></id>
<firstname>James</firstname>
<lastname>Bond</lastname>
</Record>
</DriverData>
下面的代码将增加一个节点
Dim myDoc As XMLDocumentEx = New XMLDocumentEx()
myDocLoadXml(<Data></Data>)
myDocAddNode(docVehicleSelectSingleNode(//Record) VehicleRecord Data)
myDocAddNode(docDriverSelectSingleNode(//Record) DriverRecord Data)
myDocxml<Data>
<VehicleRecord>
<id></id>
<make></make>
<model></model>
<year></year>
</ Vehicle Record>
<DriverRecord>
<id></id>
<firstname></firstname>
<lastname></lastname>
</DriverRecord>
</Data> 我们也可是使用AddNodes方法把一个记录集的所有记录增加到节点上Dim myDoc As XMLDocumentEx = New XMLDocumentEx()
myDocLoadXml(<Data> <VehicleData></Vehicle Data><DriverData></DriverData> </Data>)
myDocAddNodes(docVehicleSelectNodes(//Record) VehicleRecord Vehicle Data)
myDocAddNodes(docDriverSelectNodes(//Record) DriverRecord DriverData)结果如下myDocxml<Data>
<VehicleData>
<VehicleRecord>
<id></id>
<make>Ford</make>
<model>Escort</model>
<year></year>
</VehicleRecord>
<VehicleRecord>
<id></id>
<make>Toyota</make>
<model>Tercel</model>
<year></year>
</VehicleRecord>
<VehicleRecord>
<id></id>
<make>Mazda</make>
<model>GLC</model>
<year></year>
</VehicleRecord>
</VehicleData>
<DriverData>
<DriverRecord>
<id></id>
<firstname>Albert</firstname>
<lastname>Einstein</lastname>
</DriverRecord>
<DriverRecord>
<id></id>
<firstname>Clint</firstname>
<lastname>Eastwood</lastname>
</DriverRecord>
<DriverRecord>
<id></id>
<firstname>James</firstname>
<lastname>Bond</lastname>
</DriverRecord>
</DriverData>
</Data>下面我介绍如何合并节点假设我们有两个XmlDocument文件docBook和docBook这两个文档都包含 <Book> 节点 在docBook 中的这个 <Book> 节点 包含 <Introduction> <Chapter> and <Chapter> 在docBook中的这个 <Book> 节点 包含 <Chapter> <Chapter> and <Chapter> 下面的代码演示如何合并这两个book节点:Dim myDoc As XMLDocumentEx = New XMLDocumentEx()
myDocLoadXml(<Data> <Book></Book></Data> )
myDocMergeNode(docBookSelectSingleNode(//Book) Book Data )
myDocMergeNode(docBookSelectSingleNode(//Book) Book Data)合并后的效果如下myDocxml<Data>
<Book>
<Introduction></Introduction>
< Chapter ></Chapter>
<Chapter></Chapter>
<Chapter></Chapter>
<Chapter></Chapter>
<Chapter></Chapter>
</Book>
</Data>下面是所有的源代码sealed public class XMLDocumentEx: XmlDocument
{
public bool AddNode(XmlNode oSource String sName)
{
return AddNode(oSource sName null);
}
public bool AddNode(XmlNode oSource String sName String sParent)
{
try
{
if(sName!=null&&oSource!= null)
{
// create the new node with given name
XmlNode oNewNode = CreateElement(sName);
// copy the contents from the source node
oNewNodeInnerXml = oSourceInnerXml;
// if there is no parent node specified then add
// the new node as a child node of the root node
if(sParent!= null) sParent = sParentTrim();
if(sParent== null||sParentEquals(StringEmpty))
{
DocumentElementAppendChild(oNewNode);
return true;
}
// otherwise add the new node as a child of the parent node
else
{
if (!sParentSubstring()Equals(//)) sParent = //+sParent;
XmlNode oParent = SelectSingleNode(sParent);
if (oParent!=null)
{
oParentAppendChild(oNewNode);
return true ;
}
}
}
}
catch (Exception)
{
// error handling code
}
return false;
}
public bool AddNodes(XmlNodeList oSourceList String sName)
{
return AddNodes(oSourceList sName null);
}
public bool AddNodes(XmlNodeList oSourceList String sName String sParent)
{
try
{
if(oSourceList!= null)
{
// call AddNode for each item in the source node list
// return true only if all nodes are added successfully
int i = ;
while(i<oSourceListCount)
{
if (!AddNode(oSourceListItem(i)sNamesParent)) return false;
i++;
}
return true;
}
}
catch (Exception)
{
// error handling code
}
return false;
}
public bool MergeNode(XmlNode oSource String sName)
{
return MergeNode(oSource sName null );
}
public bool MergeNode(XmlNode oSource String sName String sParent)
{
try
{
if(sName!=null&&oSource!= null)
{
XmlNode theNode = null ;
// if there is no parent node specified
if(sParent!= null) sParent = sParentTrim();
if(sParent== null||sParentEquals(StringEmpty))
{
// if the node with specified name does not exist
// add it as a child node of the root node
theNode = SelectSingleNode(//+sName);
if (theNode==null)
{
theNode = CreateElement(sName);
DocumentElementAppendChild(theNode);
}
}
// if the parent node is specified
else
{
// find the parent node
if (!sParentSubstring()Equals(//)) sParent = //+sParent;
XmlNode theParent = SelectSingleNode(sParent);
if (theParent!=null)
{
// if the node with specified name does not exist create
// it first then add it as a child node of the parent node
theNode = theParentSelectSingleNode(sName);
if(theNode==null)
{
theNode = CreateElement(sName);
theParentAppendChild(theNode);
}
}
}
// merge the content of the source node into
// the node with specified name
if(theNode!= null)
{
theNodeInnerXml += oSourceInnerXml;
return true;
}
}
}
catch (Exception)
{
}
return false;
}
}
