在填充巨大的TreeView时使用ProgressBar [英] Using ProgressBar while populating a huge TreeView
问题描述
我在树视图中填充了大量数据，通常程序需要一段时间才能将控制权交还给用户(我想这在树视图方面太繁琐了).因此，我决定提供一个进度条，以显示用户一切正常.
I am populating a treeview with a lot of data, and usually it takes a while for program to give back the control to user (I guess it is just too much process on the treeview side). So I decided to give a progress bar to show things are going fine to user.
在此树形视图中，我选择一个文件夹，该文件夹中的所有xml文件都将添加到该文件夹中，并且树形视图如下所示:
In this treeview I select a folder and all xml files in that folder will be added to this folder and the treeview looks like this:
+ FOLDER NAME 1
|__xml file name 1
|__xml file name 2
+FOLDER NAME 2
|__xml file name 1
|__xml file name 2
所以问题是，我的进度条实际上比树状视图本身快得多地完成，我认为是时候让程序可见以显示树状视图才是必需的时间.我该怎么办?
So problem is, my progressbar will be completed actually much faster than the treeview itself, I think it is the time for progam that is making the treeview visible that takes the must time. How can I do this?
这是我的代码，用于浏览文件夹并将其传递给函数以填充树状视图(对不起，它太长了，但我想让它变得更清楚)，如您所见，我希望填充进度条的50％这一部分和其他50个节点，同时将节点添加到treeview:
This is my code for browing a folder and passing it to a function to populate treeview (Sorry taht is too long but I though it gonna make it more clear) As you see I want that 50% of progress bar to be filled in this part and other 50 while adding nodes to treeview:
private void toolStripBrowseDirectory_Click(object sender, EventArgs e)
{
//Reset progressbar
toolStripProgressBar.Value = 0;
folderBrowser.ShowNewFolderButton = false;
DialogResult result = folderBrowser.ShowDialog();
int countAllfiles = 0;
int countGoodFiles = 0;
if (result == DialogResult.OK)
{
toolStripProgressBar.Value = 0;
string selectedFolder = folderBrowser.SelectedPath;
string[] files = Directory.GetFiles(selectedFolder, "*.xml", SearchOption.AllDirectories);
List<string> goodFiles = new List<string>();
toolStripProgressBar.Maximum = files.Length;
countAllfiles = files.GetLength(0);
//Folder name
FileInfo folderInfo = new FileInfo(selectedFolder);
string folderName = folderInfo.Name;
if (countAllfiles != 0)
{
foreach (string file in files)
{
//file name
FileInfo fileInfo = new FileInfo(file);
string fileName = fileInfo.Name;
try
{
XmlDocument checkFileType = new XmlDocument();
checkFileType.Load(file);
if (checkFileType.SelectSingleNode("//Document/@Type").Value == "Test Results")
{
countGoodFiles++;
goodFiles.Add(file);
}
}
catch (Exception a)
{
StartForm.setDebug("Comparison Mode", a.Message, 21, "Can not read Selected XML file '" + fileName + "'", "Check file for compatibilyty", "File was excluded from list");
}
this.toolStripProgressBar.PerformStep();
}
if (countGoodFiles == 0)
{
MessageBox.Show("There are no compatible XML files (exported from ZTR files) in '" + folderName + "'", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
StartForm.setDebug("Comparison Mode", "N/A", 20, "There are no compatible XML files (exported from ZTR files) in '" + folderName + "'", "Select a folder that contains compatible files!", "No file has been added to Select File Tree");
toolStripProgressBar.Value = 100;
}
else if (countGoodFiles > 0)
{
this.Cursor = Cursors.WaitCursor;
AddFilesToTree(folderName, goodFiles.ToArray());
this.Cursor = Cursors.Default;
}
}
else
{
MessageBox.Show("There are no XML files in '" + folderName + "'", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
这是用于填充树状视图
private void AddFilesToTree(string folder, string[] files)
{
//Define folder node
TreeNode folderNode = new TreeNode();
folderNode.Text = folder;
folderNode.Name = "folder";
folderNode.Tag = folder;
treeViewBrowsedFiles.Nodes.Add(folderNode);
//Define file node
foreach (string file in files)
{
try
{
//To check if the file is a valid test result (converted to XML from ZTR files)
XmlDocument checkFileType = new XmlDocument();
checkFileType.Load(file);
LoadZTRCmp xml = new LoadZTRCmp(file);
TreeNode fileNode = new TreeNode();
fileNode.Text = xml.FileInfo("BatchNumber");
fileNode.Name = "file";
fileNode.Tag = file;
folderNode.Nodes.Add(fileNode);
this.toolStripProgressBar.PerformStep();
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}
folderNode.Toggle();
}
那如何正确地做呢?
更新:** 解决了 **我发现了问题，在使用函数将节点添加到Treeview之前，我必须做这行！！！
Update: ** SOLVED ** I found the problem, I had to do this line before using function to add nodes to treeview!!!
toolStripProgressBar.Maximum += countGoodFiles;
AddFilesToTree(folderName, goodFiles.ToArray());
进度条的固定MAX值在TreeView开始加载之前，进度条仍会完成(已满).
fixed MAX value for progress bar Still progressbar finishes (maxed out) before TreeView starts to load...
推荐答案
int progressSteps = (files.Length / 100)/2;
那是相当神秘的，但我当然不理解其逻辑.该代码很难阅读，您应该将其分解并使用更多的帮助器方法.尝试以下方法:
That's quite mysterious but I certainly don't understand the logic. The code is hard to read, you should break it up and use more helper methods. Try this instead:
toolStripProgressBar.Maximum = files.Length;
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