006-檔案處理刪除指定目錄底下符合條件的檔案

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string DirPath = @"C:\temp\";

            if (Directory.Exists(DirPath))
            {
                var files = Directory.GetFiles(DirPath);

                foreach (var obj in files)
                {
                    FileStream fs = new FileStream(DirPath + obj.Substring(obj.LastIndexOf("\\") + 1), FileMode.Open);
                    StreamReader sr = new StreamReader(fs, Encoding.Default);
                    //如果檔案大小小於1000 Bytes就刪除(當然也可以設定大於多少Bytes就刪除)
                    if (sr.BaseStream.Length < 1000)
                    {
                        sr.Close();
                        File.Delete(DirPath + obj.Substring(obj.LastIndexOf("\\") + 1));
                    }
                }
            }
            else
            {
                MessageBox.Show("Directory not found");
            }
        }
    }
}

 

 

 

            public void deleteFile()
            {
            string DirPath = @"C:\Temp";
            string fileName = "", tempFile;
            long size;
            if (Directory.Exists(DirPath))
            {
                var files = Directory.GetFiles(DirPath);
                foreach (var obj in files)
                {
                    fileName = obj.Substring(obj.LastIndexOf("\\") + 1);
                    tempFile = DirPath + @"\" + fileName;
                    using (StreamReader sr = new StreamReader(tempFile, Encoding.Default))
                    {
                        size = sr.BaseStream.Length;
                    }
                    if (size <= 400)
                    {
                        File.Delete(tempFile);
                    }
                }
            }
            else
            {
                MessageBox.Show("Error");
            } 
            }