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我使用XML元素填充TreeView控件。TreeView控件的大尺寸XML元素
这种方法工作得很好。但我的问题是,如果XML文件大小达到20MB +,我的应用程序冻结。有人可以帮我优化我的代码:
public void PopulateTreeView(string xmlPath)
{
try
{
var settings = new XmlReaderSettings { DtdProcessing = DtdProcessing.Ignore, XmlResolver = null };
var doc = new XmlDocument();
using (var sr = new StreamReader(xmlPath))
{
using (var reader = XmlReader.Create(sr, settings))
{
doc.Load(reader);
//Initialize the TreeView control.
treeView1.Nodes.Clear();
treeView1.Invoke((MethodInvoker)(() => treeView1.Nodes.Add(new TreeNode(doc.DocumentElement.Name))));
TreeNode tNode = new TreeNode();
tNode = treeView1.Nodes[0];
// Populate the TreeView with the DOM nodes.
AddNode(doc.DocumentElement, tNode);
}
}
}
catch (XmlException xmlEx)
{
MessageBox.Show(xmlEx.Message, Path.GetFileName(xmlPath));
}
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];
AddNode(xNode, tNode);
}
}
else
{
inTreeNode.Text = (inXmlNode.OuterXml).Trim();
}
}
非常感谢您的帮助! :)
- 编辑 -
我试着用BackgroundWorker的做到这一点,但我得到:
“出现InvalidOperationException - 此控件上执行操作时 正在从所谓错误的线程”
这就是我想:
private void frmMain_Load(object sender, EventArgs e)
{
if (!backgroundWorker.IsBusy)
backgroundWorker.RunWorkerAsync();
}
private void backgroundWorker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
if (worker.CancellationPending)
{
e.Cancel = true;
}
else
{
try
{
// SECTION 1. Create a DOM Document and load the XML data into it.
var settings = new XmlReaderSettings { DtdProcessing = DtdProcessing.Ignore, XmlResolver = null };
var doc = new XmlDocument();
using (var sr = new StreamReader(_xmlPath))
{
using (var reader = XmlReader.Create(sr, settings))
{
doc.Load(reader);
// SECTION 2. Initialize the TreeView control.
treeView1.Nodes.Clear();
treeView1.Nodes.Add(new TreeNode(doc.DocumentElement.Name));
TreeNode tNode = new TreeNode();
tNode = treeView1.Nodes[0];
// SECTION 3. Populate the TreeView with the DOM nodes.
AddNode(doc.DocumentElement, tNode);
//treeView1.ExpandAll();
}
}
}
catch (XmlException xmlEx)
{
MessageBox.Show(xmlEx.Message, Path.GetFileName(_xmlPath));
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
public 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];
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();
}
}
请在后台线程控制的人口(或使用新的异步/待机模式4.5) - 这样你的UI不会冻结。 – Tim
度量读取XML并分别填充TreeView。当你有数字时,看看需要什么时间。如果需要 - 寻求“虚拟树视图”的实现... –
请看我的编辑,谢谢你们的帮助! – jomsk1e