一、 打開文件或文件夾加載數據

1. 定義一個列表用來接收路徑

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

2. 打開文件選擇一個文件并將文件放入列表中

OpenFileDialog open = new OpenFileDialog();
// 過濾
open.Filter = "(*.jpg;*.jpge;*.bmp;*.png)|*.jpg;*.jpge;*.bmp;*.png";
open.Title = "請選擇一個文件";
string path = "";
if (open.ShowDialog() == DialogResult.OK)
{// 放入前先清空列表paths.Clear();path = open.FileName;paths.Add(path);
}

3. 打開一個文件夾并選擇一個文件夾再將文件夾中的目錄放入列表中

FolderBrowserDialog files = new FolderBrowserDialog();
files.Description = "請選擇文件夾";
string filePath = "";
if (files.ShowDialog() == DialogResult.OK) {paths.Clear();filePath = files.SelectedPath;  // 獲取文件夾路徑// 獲取文件夾下所有文件DirectoryInfo filePaths = new DirectoryInfo(filePath);FileInfo[] fileData = filePaths.GetFiles();  // 過濾文件 "**.bmp"foreach (FileInfo file in fileData){paths.Add(file.FullName);}
}

4. 每次調用都可以獲取列表中的一個文件

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

二、封裝

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與C_連接
{internal class MyFileSelection{public List<string> paths = new List<string>();public int num = 0;/// <summary>/// 選擇文件/// </summary>/// <returns></returns>public string SelectionFile() {OpenFileDialog open = new OpenFileDialog();// 過濾open.Filter = "(*.jpg;*.jpge;*.bmp;*.png)|*.jpg;*.jpge;*.bmp;*.png";open.Title = "請選擇一個文件";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>/// 選擇文件夾/// </summary>/// <returns></returns>public string SelectionFolder(){FolderBrowserDialog files = new FolderBrowserDialog();files.Description = "請選擇文件夾";string filePath = "";if (files.ShowDialog() == DialogResult.OK){paths.Clear();filePath = files.SelectedPath;  // 獲取文件夾路徑// 獲取文件夾下所有文件DirectoryInfo filePaths = new DirectoryInfo(filePath);FileInfo[] fileData = filePaths.GetFiles();  // 過濾文件 "**.bmp"foreach (FileInfo file in fileData){paths.Add(file.FullName);}}return filePath;}/// <summary>/// 獲取文件夾下不同的路徑/// </summary>/// <returns></returns>public string GetPath(){num++;if (num > paths.Count - 1) {num = 0;}return paths[num];}}
}