递归,将带有属性的xml文件解析为treeview c# [英] Recursion, parsing xml file with attributes into treeview c#
问题描述
我目前正在开发一个项目,其中应用程序将处理 XML 文件并将其显示在 C# 中的树视图中.我正在使用 Visual Studio 10 编写此代码.
I'm currently working on a project where an application will take on XML files and display it into a treeview in C#. I'm using Visual Studio 10 to write this code.
我无法限制属性的显示次数.我使用了一个 foreach 循环来遍历它拥有的每个属性并显示它,但它为节点下的每个子节点显示一次属性.如何修改此代码以仅显示一次属性?
I cannot limit number of times the attributes are displayed. I used a foreach loop to loop through each of the attributes it has and display it, but it's displaying the attributes once for each childnode it has under the node. How can I modify this code to only display the attributes once?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
namespace xmlToTreeview
{
public partial class Form1 : Form
{
string samplePath = Application.StartupPath + @"\sample.xml";
public Form1()
{
InitializeComponent();
DisplayTreeView(samplePath);
}
private void DisplayTreeView(string pathname)
{
try
{
// SECTION 1. Create a DOM Document and load the XML data into it.
XmlDocument dom = new XmlDocument();
dom.Load(pathname);
// SECTION 2. Initialize the TreeView control.
treeView1.Nodes.Clear();
treeView1.Nodes.Add(new TreeNode(dom.DocumentElement.Name));
TreeNode tNode = new TreeNode();
tNode = treeView1.Nodes[0];
// SECTION 3. Populate the TreeView with the DOM nodes.
AddNode(dom.DocumentElement, tNode);
}
catch (XmlException xmlEx)
{
MessageBox.Show(xmlEx.Message);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void AddNode(XmlNode inXmlNode, TreeNode inTreeNode)
{
XmlNode xNode;
TreeNode tNode;
XmlNodeList nodeList;
int i;
// Loop through the XML nodes until the leaf is reached.
// Add the nodes to the TreeView during the looping process.
if (inXmlNode.HasChildNodes)
{
nodeList = inXmlNode.ChildNodes;
for (i = 0; i <= nodeList.Count - 1; i++)
{
xNode = inXmlNode.ChildNodes[i];
inTreeNode.Nodes.Add(new TreeNode(xNode.Name));
tNode = inTreeNode.Nodes[i];
//Check if the XmlNode has attributes
if (inXmlNode.Attributes.Count != 0)
{
foreach (XmlAttribute att in inXmlNode.Attributes)
{
inTreeNode.Text = inTreeNode.Text + " " + att.Name + ": " + att.Value;
}
}
AddNode(xNode, tNode);
}
}
else
{
// Here you need to pull the data from the XmlNode based on the
// type of node, whether attribute values are required, and so forth.
inTreeNode.Text = (inXmlNode.OuterXml).Trim();
}
treeView1.ExpandAll();
}
}
}
这是我的 xml 的一个例子
And here is an example of my xml
<?xml version="1.0" encoding="utf-8"?>
<DataConfiguration xmln="abcefg12345" xmlns:xsi="12345abcefg" xsi:schemaLocation="12345abcefg12345abcefg">
<Hosts>
<Sites>
<Site Name="ss">
<Host Id="aa">
<Address Host="www.www.com"> </Address>
</Host>
<Host Id="ee">
<Address Host="www.www.com"> </Address>
</Host>
<Host Id="dd">
<Address Host="www.www.com"> </Address>
</Host>
<Host Id="pp">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com/"/>
</Host>
<Host Id="ss">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
<Host Id="561">
<Address Host="www.www.com"> </Address>
</Host>
</Site>
<Site Name="hihi">
<Host Id="cc">
<Address Host="www.www.com"> </Address>
</Host>
<Host Id="sdD">
<Address Host="www.www.com"> </Address>
</Host>
<Host Id="8uj">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
<Host Id="222">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
<Host Id="hhh">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
<Host Id="hhh">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
</Site>
</Sites>
<Host Id="hhh">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
<Host Id="hhh">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
<Host Id="hhh">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
<Host Id="hhh">
<Address Scheme="ppp" Host="www.www.com" Path="www.www.com"/>
</Host>
</Hosts>
<DataPools>
<DataPool Id="sss" default="sure">
<DataGroup Id="sss" Parent="aaa" UserCanSelectHost="sure" >
<HostId Parent="hhhh">I'm breaking here</HostId>
<DataSources>
<empty/>
</DataSources>
</DataGroup>
<DataGroup Id="ccc" UserCanSelectHost="whynot" >
<HostId>God I'm breaking here again, i hope you can fix me</HostId>
<DataSources>
<empty/>
</DataSources>
</DataGroup>
<DataGroup Id="sss" UserCanSelectHost="yessure" >
<HostId>cry face</HostId>
<webfg displaygroup="sss" provider="sss" id="ccc" principal="ccc" nioarc="ccc" nap="ccc" group="ccc">
</webfg>
<nhood port="1234"/>
<ServerNames>
<!-- insert comment -->
<!-- insert comment -->
<!-- insert comment -->
<ServerName>myname</ServerName>
<ServerName>yourname</ServerName>
</ServerNames>
<!-- insert comment -->
<Implementations>
<Implementation>
<Name>yourname</Name>
<Type>typeme</Type>
<Assembly>visionme</Assembly>
<Path>ohno</Path>
</Implementation>
</Implementations>-->
<cfgman port="ccc" />
<webservice provider="ccc" />
<webservice provider="ccc" />
<webservice provider="ccc" />
<parameters>
<useeventpush value="ccc"/>
</parameters>
<webservice provider="ccc" />
<pollingFrequency value="1000"/>
</DataGroup>
</DataPool>
<DataGroup Id="ccc " UserCanSelectHost="ccc" >
<DataGroup Id="ccc " UserCanSelectHost="ccc" >
<HostId>idk</HostId>
<DataSources>
<empty/>
</DataSources>
</DataGroup>
<DataGroup Id="ccc " UserCanSelectHost="ccc" >
<HostId>idk</HostId>
<DataSources>
<empty/>
</DataSources>
</DataGroup>
<DataGroup Id="default" UserCanSelectHost="true" >
<HostId>idk</HostId>
</DataGroup>
</DataGroup>
</DataPools>
</DataConfiguration>
推荐答案
需要将循环通过属性移出通过子节点的循环:
You need to move the loop through attributes out of the loop through child nodes:
private void AddNode(XmlNode inXmlNode, TreeNode inTreeNode)
{
// Loop through the XML nodes until the leaf is reached.
// Add the nodes to the TreeView during the looping process.
if (inXmlNode.HasChildNodes)
{
//Check if the XmlNode has attributes
foreach (XmlAttribute att in inXmlNode.Attributes)
{
inTreeNode.Text = inTreeNode.Text + " " + att.Name + ": " + att.Value;
}
var nodeList = inXmlNode.ChildNodes;
for (int i = 0; i < nodeList.Count; i++)
{
var xNode = inXmlNode.ChildNodes[i];
var tNode = inTreeNode.Nodes[inTreeNode.Nodes.Add(new TreeNode(xNode.Name))];
AddNode(xNode, tNode);
}
}
else
{
// Here you need to pull the data from the XmlNode based on the
// type of node, whether attribute values are required, and so forth.
inTreeNode.Text = (inXmlNode.OuterXml).Trim();
}
treeView1.ExpandAll();
}
更新
如果要过滤掉命名空间属性,可以添加扩展方法一个>:
If you want to filter out namespace attributes, you can add extension methods:
public static class XmlNodeExtensions
{
public static bool IsDefaultNamespaceDeclaration(this XmlAttribute attr)
{
if (attr == null)
return false;
if (attr.NamespaceURI != "http://www.w3.org/2000/xmlns/")
return false;
return attr.Name == "xmlns";
}
public static bool IsNamespaceDeclaration(this XmlAttribute attr)
{
if (attr == null)
return false;
if (attr.NamespaceURI != "http://www.w3.org/2000/xmlns/")
return false;
return attr.Name == "xmlns" || attr.Name.StartsWith("xmlns:");
}
}
然后使用它跳过不需要的 XmlAttribute
实例.您还可以将 XmlElement
类型的所有节点的文本显式设置为名称 + 属性数据,而不仅仅是那些有子元素的元素,仅将 OuterXml
用于文本节点:>
Then use it to skip unwanted XmlAttribute
instances. You can also explicitly set the text of all nodes of type XmlElement
to be name + attribute data, not just those elements with children, using OuterXml
only for text nodes:
private void AddNode(XmlNode inXmlNode, TreeNode inTreeNode)
{
if (inXmlNode is XmlElement)
{
// An element. Display element name + attribute names & values.
foreach (var att in inXmlNode.Attributes.Cast<XmlAttribute>().Where(a => !a.IsNamespaceDeclaration()))
{
inTreeNode.Text = inTreeNode.Text + " " + att.Name + ": " + att.Value;
}
// Add children
foreach (XmlNode xNode in inXmlNode.ChildNodes)
{
var tNode = inTreeNode.Nodes[inTreeNode.Nodes.Add(new TreeNode(xNode.Name))];
AddNode(xNode, tNode);
}
}
else
{
// Not an element. Character data, comment, etc. Display all text.
inTreeNode.Text = (inXmlNode.OuterXml).Trim();
}
treeView1.ExpandAll();
}
如果你真的只想过滤掉默认的命名空间定义而留下其他的,你可以这样做:
If you really want to filter out just the default namespace definitions but leave others, you could do:
// An element. Display element name + attribute names & values.
foreach (var att in inXmlNode.Attributes.Cast<XmlAttribute>().Where(a => !a.IsDefaultNamespaceDeclaration()))
{
inTreeNode.Text = inTreeNode.Text + " " + att.Name + ": " + att.Value;
}
顺便说一句,我不建议这样做,因为以下实际上意味着相同的事情,即命名空间 http://somenamespace
中具有本地名称 DataConfiguration
的元素:
Incidentally, I don't recommend doing this since the following actually mean the same thing, namely an element with local name DataConfiguration
in the namespace http://somenamespace
:
<ss:DataConfiguration xmlns:ss="http://somenamespace"/>
<DataConfiguration xmlns="http://somenamespace"/>
您的树将显示第一个元素的命名空间,但不会显示第二个元素.
Your tree will display the namespace for the first element but not the second.
更新 2
要在树中包含 XmlDeclaration
,请将顶级循环更改为:
To include the XmlDeclaration
in the tree, change the top level loop to be:
treeView1.Nodes.Clear();
foreach (XmlNode xNode in dom.ChildNodes)
{
var tNode = treeView1.Nodes[treeView1.Nodes.Add(new TreeNode(xNode.Name))];
AddNode(xNode, tNode);
}
更新 3
将循环包含在 DisplayTreeView
中的 XmlDeclaration
循环:
Put the loop to include the XmlDeclaration
loop in DisplayTreeView
:
private void DisplayTreeView(string pathname)
{
try
{
// SECTION 1. Create a DOM Document and load the XML data into it.
XmlDocument dom = new XmlDocument();
dom.Load(pathname);
// SECTION 2. Initialize the TreeView control.
treeView1.Nodes.Clear();
// SECTION 3. Populate the TreeView with the XML nodes.
foreach (XmlNode xNode in dom.ChildNodes)
{
var tNode = treeView1.Nodes[treeView1.Nodes.Add(new TreeNode(xNode.Name))];
AddNode(xNode, tNode);
}
}
catch (XmlException xmlEx)
{
MessageBox.Show(xmlEx.Message);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
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