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:

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

返回当前目录的文件列表。

List.Intersect(List);

找出兩陣列相同的項目.

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");
           }
 
       }