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一、 打开文件或文件夹加载数据

1. 定义一个列表用来接收路径

public List<string> paths = new List<string>();

2. 打开文件选择一个文件并将文件放入列表中

OpenFileDialog open = new OpenFileDialog();
// 过滤
open.Filter = "(*.jpg;*.jpge;*.bmp;*.png)|*.jpg;*.jpge;*.bmp;*.png";
open.Title = "请选择一个文件";
string path = "";
if (open.ShowDialog() == DialogResult.OK)
{// 放入前先清空列表paths.Clear();path = open.FileName;paths.Add(path);
}

3. 打开一个文件夹并选择一个文件夹再将文件夹中的目录放入列表中

FolderBrowserDialog files = new FolderBrowserDialog();
files.Description = "请选择文件夹";
string filePath = "";
if (files.ShowDialog() == DialogResult.OK) {paths.Clear();filePath = files.SelectedPath;  // 获取文件夹路径// 获取文件夹下所有文件DirectoryInfo filePaths = new DirectoryInfo(filePath);FileInfo[] fileData = filePaths.GetFiles();  // 过滤文件 "**.bmp"foreach (FileInfo file in fileData){paths.Add(file.FullName);}
}

4. 每次调用都可以获取列表中的一个文件

public int num = 0;
private string GetPath()
{num++;if (num > paths.Count - 1) {num = 0;}return paths[num];
}

二、封装

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace VP与C_连接
{internal class MyFileSelection{public List<string> paths = new List<string>();public int num = 0;/// <summary>/// 选择文件/// </summary>/// <returns></returns>public string SelectionFile() {OpenFileDialog open = new OpenFileDialog();// 过滤open.Filter = "(*.jpg;*.jpge;*.bmp;*.png)|*.jpg;*.jpge;*.bmp;*.png";open.Title = "请选择一个文件";string path = "";if (open.ShowDialog() == DialogResult.OK){// 放入前先清空列表paths.Clear();path = open.FileName;paths.Add(path);}return path;}/// <summary>/// 选择文件夹/// </summary>/// <returns></returns>public string SelectionFolder(){FolderBrowserDialog files = new FolderBrowserDialog();files.Description = "请选择文件夹";string filePath = "";if (files.ShowDialog() == DialogResult.OK){paths.Clear();filePath = files.SelectedPath;  // 获取文件夹路径// 获取文件夹下所有文件DirectoryInfo filePaths = new DirectoryInfo(filePath);FileInfo[] fileData = filePaths.GetFiles();  // 过滤文件 "**.bmp"foreach (FileInfo file in fileData){paths.Add(file.FullName);}}return filePath;}/// <summary>/// 获取文件夹下不同的路径/// </summary>/// <returns></returns>public string GetPath(){num++;if (num > paths.Count - 1) {num = 0;}return paths[num];}}
}