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在進行影像處理工作時, 經常需要批次處理,

處理的對象可能是某個目錄夾下的一序列影像 {0.bmp, 1.bmp, 2.bmp,….},

可以存放在一個List<string>的容器內, 紀錄該目錄夾特定附檔名的檔案名稱

   1: public static List<string> searchFileNames(string sDirPath, string fileExtension)

   2:         {

   3:             List<string> list = new List<string>();

   4:             if (!Directory.Exists(sDirPath)) return null;

   5:             foreach (string filePath in System.IO.Directory.GetFiles(sDirPath, fileExtension))

   6:             {

   7:                 list.Add(System.IO.Path.GetFileName(filePath));

   8:             }

   9:             return list;

  10:         }

"True love never goes smooth", 搜尋出來結果有點失望

一種做法是將位數補足2位數,但我不想這麼做…因為遲早會遇到

利用檔案名稱(不含副檔名)進行排序, 可以達到令人滿意的檔案名稱排序

   1: if (BrowserTBx.Text.Length > 0)

   2:            {

   3:                _lastDir = BrowserTBx.Text;

   4:                _extensions = extensionTBx.Text;

   5:                List<string> list = FileTool.searchFileNames(_lastDir, _extensions);

   6:                filesLB.Items.Clear();

   7:                if(checkBox1.Checked)

   8:                try

   9:                {

  10:                    list.Sort(delegate(string x, string y)

  11:                    {

  12:                        int x1 = Convert.ToInt16(Path.GetFileNameWithoutExtension(x));

  13:                        int y1 = Convert.ToInt16(Path.GetFileNameWithoutExtension(y));

  14:                        return x1.CompareTo(y1);

  15:                    });

  16:                }

  17:                catch (Exception exception) { MessageBox.Show(exception.Message); }

  18:                if (list.Count > 0)

  19:                {

  20:                    foreach (string item in list)

  21:                    {

  22:                        filesLB.Items.Add(item);

  23:                    }

  24:                }

  25:            }

當使用者點選某個檔案名稱時, 希望可以自動載入圖片

   1: private void LoadImage()

   2:        {

   3:            string filePath = _lastDir +"\\" + filesLB.Text;

   4:            try

   5:            {

   6:                if (extensionTBx.Text == "*.jpg" |

   7:                    extensionTBx.Text == "*.bmp" |

   8:                    extensionTBx.Text == "*.png" |

   9:                    extensionTBx.Text == "*.tif")

  10:                    imageBox1.Load( filePath );

  11:            }

  12:            catch

  13:            {

  14:            }

  15:        }

=======================================================================

(1)第一種狀況是檔名即編號+.bmp

上面比較函式採用匿名函式, 也可以自訂義類別如CompareByNum

   1: public class CompareByNum : IComparer<string>

   2: {

   3:     public int Compare(string x, string y) // implement IComparer interface

   4:      {

   5:          int x1 = Convert.ToInt16(Path.GetFileNameWithoutExtension(x));

   6:          int y1 = Convert.ToInt16(Path.GetFileNameWithoutExtension(y));

   7:          return x1.CompareTo(y1);

   8:      } 

   9: }

(2) 第二種狀況是 編號_X座標_Y座標.bmp

自訂義類別如CompareByNumUnderline

   1: public class CompareByNumUnderline : IComparer<string>

   2:     {

   3:         public int Compare(string x, string y) // implement IComparer interface

   4:         {

   5:             string[] x_split = x.Split('_');

   6:             string[] y_split = y.Split('_');

   7:             

   8:             int x1 = Convert.ToInt16(x_split[0]);

   9:             int y1 = Convert.ToInt16(y_split[0]);

  10:             return x1.CompareTo(y1);

  11:         }

  12:     }

如果是預設排序則是長得像這樣

(3) 第三種狀況是 列數_行數.bmp

   1: public class CompareByRowColUnderline : IComparer<string>

   2:     {

   3:         public int Compare(string x, string y) // implement IComparer interface

   4:         {

   5:             string[] x_split = Path.GetFileNameWithoutExtension(x).Split('_');

   6:             string[] y_split = Path.GetFileNameWithoutExtension(y).Split('_');

   7:             int stride = 12;

   8:             int row1 = Convert.ToInt16(x_split[0]);

   9:             int row2 = Convert.ToInt16(y_split[0]);

  10:             int col1 = Convert.ToInt16(x_split[1]);

  11:             int col2 = Convert.ToInt16(y_split[1]);

  12:             int ind1 = row1 * stride + col1;

  13:             int ind2 = row2 * stride + col2;

  14:             return ind1.CompareTo(ind2);

  15:         }

  16:     }

================================================================

呼叫方式

   1: private void SearchSubroutine()

   2:         {

   3:             if (BrowserTBx.Text.Length > 0)

   4:             {

   5:                 _lastDir = BrowserTBx.Text;

   6:                 _extensions = extensionTBx.Text;

   7:                 List<string> list = FileTool.searchFileNames(_lastDir, _extensions);

   8:                 filesLB.Items.Clear();

   9:                 

  10:                 try

  11:                 {

  12:                     switch (comboBox1.SelectedIndex)

  13:                     {

  14:                         case 0:

  15:                             break;

  16:                         case 1:

  17:                             list.Sort(new CompareByNum());

  18:                             break;

  19:                         case 2:

  20:                             list.Sort(new CompareByNumUnderline());

  21:                             break;

  22:                         case 3:

  23:                             list.Sort(new CompareByRowColUnderline());

  24:                             break;

  25:                     }

  26:                 }

  27:                 catch (Exception exception) { MessageBox.Show(exception.Message); }

  28:                 if (list.Count > 0)

  29:                 {

  30:                     foreach (string item in list)

  31:                     {

  32:                         filesLB.Items.Add(item);

  33:                     }

  34:                 }

  35:             }

  36:         }

參考資料

1. 1. C#文件和文件文件夹按时间、名称排序-顺序与倒序
2. 2. C# 取得副檔名的方法
3. 3. C# 系统应用之TreeView控件 (一).显示树状磁盘文件目录及加载图标
4. 4. Problem sorting lists using delegates
5. 5. 如何：分割字串 (C# 程式設計手冊)