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.