C# list 新用法

用list的方法来完成在一个数型结构的文件夹中,可能在拷贝时中间出现了差错,希望有一段代码来比较两个文件夹中的异同数目有多少.

主要用到的方法是:

1:

 System.IO.DirectoryInfo.GetFiles("*.*", System.IO.SearchOption.AllDirectories);

返回当前目录的文件列表。

2:

List.Intersect(List);

找出兩陣列相同的項目.

3:

List.Except(List);

找出兩陣列不相同的項目-Except

新建一个ErrorFrom.cs  From

代码如下:

public partial class ErrorFrom : Form
    {
        public ErrorFrom(List<string> errorList)
        {
            InitializeComponent();
            if (errorList != null)
            {
                foreach (string str in errorList)
                    lstError.AppendText(str);
            }
        }
        public ErrorFrom()
        {
            InitializeComponent();
        }
    }

图片如下:

新建一个MessageFrom.cs  From,代码如下:

  public partial class MessageFrom : Form
    {
        public MessageFrom()
        {
            InitializeComponent();
        }
        public MessageFrom(List<string> MessageList)
        {

            InitializeComponent();
            if (MessageList != null)
            {
                foreach (string str in MessageList)
                    lstMessage.AppendText(str);
            }
        }
    }

界面如下:

新加一个CompareFolder.cs From,代码如下:

下面正式看代码:

 public partial class CompareFolder : Form
    {
        public CompareFolder()
        {
            InitializeComponent();
            txtFolderOne.ReadOnly = true;
            txtFolderTwo.ReadOnly = true;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="errorList"></param>
        private void HandleError(List<string> errorList)
        {
            if (errorList != null && errorList.Count > 0)
            {
                ErrorFrom errorForm = new ErrorFrom(errorList);
                errorForm.Show();
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="messageList"></param>
        private void HandleMessage(List<string> messageList)
        {
            if (messageList != null && messageList.Count > 0)
            {
                MessageFrom messageForm = new MessageFrom(messageList);
                messageForm.Show();
            }
        }
        public List<string> ErrorList = new List<string>();
        public List<string> MessageList = new List<string>();
        private void btnFolderOne_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.ShowDialog();
            txtFolderOne.Text = folderBrowserDialog1.SelectedPath;
        }

        private void btnFolderTwo_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.ShowDialog();
            txtFolderTwo.Text = folderBrowserDialog1.SelectedPath;
        }

        private void btnRun_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txtFolderOne.Text))
            {
                ErrorList.Add("Please Select folder one.");
                HandleError(ErrorList);
                return;
            }
            if (string.IsNullOrEmpty(txtFolderTwo.Text))
            {
               ErrorList.Add("Please Select folder two.");
               HandleError(ErrorList);
                return;
            }
            CompareSubDirectory(txtFolderOne.Text, txtFolderTwo.Text);
            HandleMessage(MessageList);
            HandleError(ErrorList);
        }

        private void CompareSubDirectory(string urlone, string urltwo)
        {


            string pathA =urlone;
            string pathB = urltwo;

            System.IO.DirectoryInfo dir1 = new System.IO.DirectoryInfo(pathA);
            System.IO.DirectoryInfo dir2 = new System.IO.DirectoryInfo(pathB);

            //find All Files.
            IEnumerable<System.IO.FileInfo> list1 = dir1.GetFiles("*.*", System.IO.SearchOption.AllDirectories);
            IEnumerable<System.IO.FileInfo> list2 = dir2.GetFiles("*.*", System.IO.SearchOption.AllDirectories);
            List<string> filelistone = new List<string>();
            List<string> filelisttwo = new List<string>();

            //To List with Relative Path.
            foreach (System.IO.FileInfo files in list1)
            {
                string filepathone = files.DirectoryName.Replace(pathA, "") + "\\" + files.Name;
                filelistone.Add(filepathone);
            }

            //To List with Relative Path.
            foreach (System.IO.FileInfo files in list2)
            {
                string filepathtwo = files.DirectoryName.Replace(pathB, "") + "\\" + files.Name;
                filelisttwo.Add(filepathtwo);
            }

            //check Is Same
            bool areIdentical = filelistone.SequenceEqual(filelisttwo);

            if (areIdentical == true)
            {
               MessageList.Add("the two folders are the same.\n");
            }
            else
            {
                ErrorList.Add("The two folders are not the same.\n");
            }


            //Find Same
            var queryCommonFiles = filelistone.Intersect(filelisttwo);

            if (queryCommonFiles.Count() > 0)
            {
               MessageList.Add("The following files are in both folders:\n");
                foreach (var v in queryCommonFiles)
                {
                    MessageList.Add(v + "\n"); 
                }
            }
            else
            {
                ErrorList.Add("There are no common files in the two folders.\n");
            }

            // Find not Same.
            var queryList1Only = (from file in filelistone
                                  select file).Except(filelisttwo);

            ErrorList.Add("The following files are in list1 but not list2:\n");
            foreach (var v in queryList1Only)
            {
                ErrorList.Add(v + "\n");
            }
            var querylist2Only = (from file in filelisttwo select file).Except(filelistone);

            ErrorList.Add("The following files are in list2 but not list1:\n");
            foreach (var v in querylist2Only)
            {
                ErrorList.Add(v+"\n");
            }

        }

界面如下:

欢迎拍砖.