网站运营解决方案,免费家具网站模板,陕西住房建设厅考试官方网站,网站设计的逻辑结构C#用TreeView访问文件或文件夹#xff0c;通过递归#xff0c;展开所有文件夹#xff08;类似资源管理器的树形窗体#xff09; 首先#xff0c;算法是用递归算法#xff0c;不断的递归文件。以此来遍历整个电脑的磁盘内容#xff0c;过程也很简单。这种算法的时间复杂度…C#用TreeView访问文件或文件夹通过递归展开所有文件夹类似资源管理器的树形窗体 首先算法是用递归算法不断的递归文件。以此来遍历整个电脑的磁盘内容过程也很简单。这种算法的时间复杂度太大。以至于窗体打开较慢效率不高。 View Code 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.IO;namespace FolderBrowserApp
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){try{//获取所有驱动盘目录string[] s Directory.GetLogicalDrives();//通过遍历去添加所有父节点foreach (string m in s){//父节点TreeNode node new TreeNode(m);//给treeview添加节点this.treeView1.Nodes.Add(node);//调用方法递归出磁盘的所有文件并将父节点和路径传入expendtree(m, node);}}catch { }}private void expendtree(string path, TreeNode tn){try{//获取父节点目录的子目录string[] s1 Directory.GetDirectories(path);//子节点TreeNode subnode new TreeNode();//通过遍历给传进来的父节点添加子节点foreach (string j in s1){subnode new TreeNode(j);tn.Nodes.Add(subnode);//对文件夹不断递归得到所有文件expendtree(j, subnode);}}catch { }}}
} 分析以上代码造成打开慢的原因是一开始就加载所有数据到TreeView控件中来为了提高效率可以等选用选择了相关的驱动器对象再来加载相关的文件夹这样高效了很多。所以经过修改再添加多一个ListBox把文件也显示出来。 View Code 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.IO;namespace WindowsFormsApplication2
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){//显示各逻辑磁盘string[] drivers Directory.GetLogicalDrives();foreach (string driver in drivers){TreeNode node new TreeNode(driver);treeView1.Nodes.Add(node);//不再预先遍历文件夹// expendtree(driver, node);}}private void expendtree(string path, TreeNode tn){try{//遍历指定的文件夹目录string[] dirs Directory.GetDirectories(path);foreach (string dir in dirs){TreeNode subnode new TreeNode(dir);tn.Nodes.Add(subnode);//不再遍历子文件夹// expendtree(dir, subnode);}}catch { }}private void treeView1_AfterSelect(object sender, TreeViewEventArgs e){//选择节点的信息TreeNode selnode treeView1.SelectedNode;string selname treeView1.SelectedNode.Text;//开始遍历选定的节点并展开它expendtree(selname, selnode);selnode.Expand();//加载选定节点文件夹的相关文件string[] files Directory.GetFiles(selname);listBox1.Items.Clear();foreach (string file in files){listBox1.Items.Add(file);}}}
} 分析以上代码看到文件夹显示的都是完整路径这不是我们想要的我们只需要显示文件夹名就可以了所以需要再次修改。 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.IO; namespace WindowsFormsApplication2{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { //显示各逻辑磁盘 string[] drivers Directory.GetLogicalDrives(); foreach (string driver in drivers) { TreeNode node new TreeNode(driver); treeView1.Nodes.Add(node); } } private void expendtree(string path, TreeNode tn) { try { //遍历指定的文件夹目录 string[] dirs Directory.GetDirectories(path); foreach (string dir in dirs) { //截取文件夹名,作节点名,不需要显示完整路径 string mdir dir.Substring(dir.LastIndexOf(\\) 1, dir.Length - dir.LastIndexOf(\\) - 1); TreeNode subnode new TreeNode(mdir); tn.Nodes.Add(subnode); } } catch { } } private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { //选择节点的信息 TreeNode selnode treeView1.SelectedNode; // string selname treeView1.SelectedNode.Text; //修改国节点的完整路径 string selname selnode.FullPath; //开始遍历选定的节点并展开它 expendtree(selname, selnode); selnode.Expand(); //加载选定节点文件夹的相关文件 string[] files Directory.GetFiles(selname); listBox1.Items.Clear(); foreach (string file in files) { listBox1.Items.Add(file); } } }} 再次更改呵呵做成图片浏览工具添加文件到列表框时过滤图片文件 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.IO;namespace WindowsFormsApplication2
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){//显示各逻辑磁盘string[] drivers Directory.GetLogicalDrives();foreach (string driver in drivers){TreeNode node new TreeNode(driver);treeView1.Nodes.Add(node);}}private void expendtree(string path, TreeNode tn){try{//遍历指定的文件夹目录string[] dirs Directory.GetDirectories(path);foreach (string dir in dirs){ //截取文件夹名,作节点名,不需要显示完整路径string mdir dir.Substring(dir.LastIndexOf(\\) 1, dir.Length - dir.LastIndexOf(\\) - 1);TreeNode subnode new TreeNode(mdir);tn.Nodes.Add(subnode);}}catch { }}private void treeView1_AfterSelect(object sender, TreeViewEventArgs e){//选择节点的信息TreeNode selnode treeView1.SelectedNode;// string selname treeView1.SelectedNode.Text;//修改国节点的完整路径string selname selnode.FullPath;//开始遍历选定的节点并展开它expendtree(selname, selnode);selnode.Expand();//加载选定节点文件夹的相关文件string[] files Directory.GetFiles(selname);listBox1.Items.Clear();foreach (string file in files){ //在加载文件时,按扩展名来过滤文件,只显示jpg和bmp文件string mfilefile.Substring(file.Length-3,3);switch (mfile){ case jpg:case bmp:listBox1.Items.Add(file);break;default:break;}}}private void listBox1_Click(object sender, EventArgs e){//加载图片if (listBox1.SelectedIndex 0){string file listBox1.SelectedItem.ToString();try{pictureBox1.Image Image.FromFile(file);}catch{ }}}}
}添加父节点及节点的状态图标先给工程中添加ImageList控件加载四个状态图标 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.IO;namespace WindowsFormsApplication2
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){//显示各逻辑磁盘string[] drivers Directory.GetLogicalDrives();foreach (string driver in drivers){TreeNode node new TreeNode(driver);//逻辑磁盘图标两个状态不变node.ImageIndex 1;node.SelectedImageIndex 1;treeView1.Nodes.Add(node);}}private void expendtree(string path, TreeNode tn){try{//遍历指定的文件夹目录string[] dirs Directory.GetDirectories(path);foreach (string dir in dirs){ //截取文件夹名,作节点名,不需要显示完整路径string mdir dir.Substring(dir.LastIndexOf(\\) 1, dir.Length - dir.LastIndexOf(\\) - 1);TreeNode subnode new TreeNode(mdir);//文件夹图标两个状态有变化subnode.ImageIndex 2;subnode.SelectedImageIndex 3;tn.Nodes.Add(subnode);}}catch { }}private void treeView1_AfterSelect(object sender, TreeViewEventArgs e){//选择节点的信息TreeNode selnode treeView1.SelectedNode;// string selname treeView1.SelectedNode.Text;//修改国节点的完整路径string selname selnode.FullPath;//开始遍历选定的节点并展开它expendtree(selname, selnode);selnode.Expand();try{//加载选定节点文件夹的相关文件string[] files Directory.GetFiles(selname);listBox1.Items.Clear();foreach (string file in files){//在加载文件时,按扩展名来过滤文件,只显示jpg和bmp文件string mfile file.Substring(file.Length - 3, 3);switch (mfile){case jpg:case bmp:listBox1.Items.Add(file);break;default:break;}}}catch { }}private void listBox1_Click(object sender, EventArgs e){//加载图片if (listBox1.SelectedIndex 0){string file listBox1.SelectedItem.ToString();try{pictureBox1.Image Image.FromFile(file);}catch{ }}}}
}
