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NPOI学习

 1 using System.Collections.Generic;
 2 using NPOI.HSSF.UserModel;
 3 using System.IO;
 4 using NPOI.SS.UserModel;
 5 
 6 namespace NPOIDemo
 7 {
 8     public class Excel
 9     {
10         public HSSFWorkbook hssfWorkbook
11         {
12             get {
13                 FileStream file = new FileStream(@"D:SourceNPOIDemoNPOIDemoFiles	emp.xls", FileMode.Open, FileAccess.Read);
14 
15                 return new HSSFWorkbook(file);
16             }
17         }
18 
19         /// <summary>
20         /// 获取Sheet中所有数据有效性
21         /// </summary>
22         /// <returns></returns>
23         public List<IDataValidation> GetDataValidations()
24         {
25             ISheet ws = hssfWorkbook.GetSheet("1");
26             return ws.GetDataValidations();
27         }
28 
29         /// <summary>
30         /// 获取单元格数据有效性
31         /// </summary>
32         /// <param name="range">单元格范围 F71:F93或E5等</param>
33         /// <returns></returns>
34         public string[] GetExplicitListValuesByRange(string range)
35         {
36             ISheet ws = hssfWorkbook.GetSheet("1");
37             var dataValidations = ws.GetDataValidations();
38             foreach (var item in dataValidations)
39             {
40                 foreach (var rangeAddresses in item.Regions.CellRangeAddresses)
41                 {
42                     if (rangeAddresses.FormatAsString() == range)
43                     {
44                         return item.ValidationConstraint.ExplicitListValues;
45                     }
46                 }
47             }
48 
49             return new string[0];
50         }
51 
52         /// <summary>
53         /// 获取批注
54         /// </summary>
55         /// <returns></returns>
56         public string GetCommont()
57         {
58             ISheet ws = hssfWorkbook.GetSheet("1");
59             IComment commont=ws.GetCellComment(88, 55);
60 
61             return commont.String.String;
62         }
63 
64         /// <summary>
65         /// 提取图片及图片信息
66         /// </summary>
67         /// <returns></returns>
68         public IList<PicturesInfo> GetPictures()
69         {
70             ISheet ws = hssfWorkbook.GetSheet("1");
71             //return ws.Workbook.GetAllPictures();
72 
73             return ws.GetAllPictureInfos(365,370,9,20);
74         }
75 
76     }
77     
78    
79 }

简单示例：数据有效性、批注、图片

提取图片扩展方法来源：使用NPOI从Excel中提取图片及图片位置信息

  1 public class PicturesInfo  
  2   {  
  3       public string ext { get; set; }  
  4       public int MinRow { get; set; }  
  5       public int MaxRow { get; set; }  
  6       public int MinCol { get; set; }  
  7       public int MaxCol { get; set; }  
  8       public Byte[] PictureData { get; private set; }  
  9   
 10       public PicturesInfo(int minRow, int maxRow, int minCol, int maxCol, Byte[] pictureData, string ext)  
 11       {  
 12           this.MinRow = minRow;  
 13           this.MaxRow = maxRow;  
 14           this.MinCol = minCol;  
 15           this.MaxCol = maxCol;  
 16           this.PictureData = pictureData;  
 17           this.ext = ext;  
 18       }  
 19   }  
 20   public static class NpoiExtend  
 21   {  
 22       public static List<PicturesInfo> GetAllPictureInfos(this ISheet sheet)  
 23       {  
 24           return sheet.GetAllPictureInfos(null, null, null, null);  
 25       }  
 26   
 27       public static List<PicturesInfo> GetAllPictureInfos(this ISheet sheet, int? minRow, int? maxRow, int? minCol, int? maxCol, bool onlyInternal = true)  
 28       {  
 29           if (sheet is HSSFSheet)  
 30           {  
 31               return GetAllPictureInfos((HSSFSheet)sheet, minRow, maxRow, minCol, maxCol, onlyInternal);  
 32           }  
 33           else if (sheet is XSSFSheet)  
 34           {  
 35               return GetAllPictureInfos((XSSFSheet)sheet, minRow, maxRow, minCol, maxCol, onlyInternal);  
 36           }  
 37           else  
 38           {  
 39               throw new Exception("未处理类型，没有为该类型添加：GetAllPicturesInfos()扩展方法！");  
 40           }  
 41       }  
 42   
 43       private static List<PicturesInfo> GetAllPictureInfos(HSSFSheet sheet, int? minRow, int? maxRow, int? minCol, int? maxCol, bool onlyInternal)  
 44       {  
 45           List<PicturesInfo> picturesInfoList = new List<PicturesInfo>();  
 46   
 47           var shapeContainer = sheet.DrawingPatriarch as HSSFShapeContainer;  
 48           if (null != shapeContainer)  
 49           {  
 50               var shapeList = shapeContainer.Children;  
 51               foreach (var shape in shapeList)  
 52               {  
 53                   if (shape is HSSFPicture && shape.Anchor is HSSFClientAnchor)  
 54                   {  
 55                       var picture = (HSSFPicture)shape;  
 56                       var anchor = (HSSFClientAnchor)shape.Anchor;  
 57   
 58                       if (IsInternalOrIntersect(minRow, maxRow, minCol, maxCol, anchor.Row1, anchor.Row2, anchor.Col1, anchor.Col2, onlyInternal))  
 59                       {  
 60                           
 61                           picturesInfoList.Add(new PicturesInfo(anchor.Row1, anchor.Row2, anchor.Col1, anchor.Col2, picture.PictureData.Data,picture.PictureData.MimeType));  
 62                       }  
 63                   }  
 64               }  
 65           }  
 66   
 67           return picturesInfoList;  
 68       }  
 69   
 70       private static List<PicturesInfo> GetAllPictureInfos(XSSFSheet sheet, int? minRow, int? maxRow, int? minCol, int? maxCol, bool onlyInternal)  
 71       {  
 72           List<PicturesInfo> picturesInfoList = new List<PicturesInfo>();  
 73   
 74           var documentPartList = sheet.GetRelations();  
 75           foreach (var documentPart in documentPartList)  
 76           {  
 77               if (documentPart is XSSFDrawing)  
 78               {  
 79                   var drawing = (XSSFDrawing)documentPart;  
 80                   var shapeList = drawing.GetShapes();  
 81                   foreach (var shape in shapeList)  
 82                   {  
 83                       if (shape is XSSFPicture)  
 84                       {  
 85                           var picture = (XSSFPicture)shape;  
 86                           var anchor = picture.GetPreferredSize();  
 87   
 88                           if (IsInternalOrIntersect(minRow, maxRow, minCol, maxCol, anchor.Row1, anchor.Row2, anchor.Col1, anchor.Col2, onlyInternal))  
 89                           {  
 90                               picturesInfoList.Add(new PicturesInfo(anchor.Row1, anchor.Row2, anchor.Col1, anchor.Col2, picture.PictureData.Data,picture.PictureData.MimeType));  
 91                           }  
 92                       }  
 93                   }  
 94               }  
 95           }  
 96   
 97           return picturesInfoList;  
 98       }  
 99   
100       private static bool IsInternalOrIntersect(int? rangeMinRow, int? rangeMaxRow, int? rangeMinCol, int? rangeMaxCol,  
101           int pictureMinRow, int pictureMaxRow, int pictureMinCol, int pictureMaxCol, bool onlyInternal)  
102       {  
103           int _rangeMinRow = rangeMinRow ?? pictureMinRow;  
104           int _rangeMaxRow = rangeMaxRow ?? pictureMaxRow;  
105           int _rangeMinCol = rangeMinCol ?? pictureMinCol;  
106           int _rangeMaxCol = rangeMaxCol ?? pictureMaxCol;  
107   
108           if (onlyInternal)  
109           {  
110               return (_rangeMinRow <= pictureMinRow && _rangeMaxRow >= pictureMaxRow &&  
111                       _rangeMinCol <= pictureMinCol && _rangeMaxCol >= pictureMaxCol);  
112           }  
113           else  
114           {  
115               return ((Math.Abs(_rangeMaxRow - _rangeMinRow) + Math.Abs(pictureMaxRow - pictureMinRow) >= Math.Abs(_rangeMaxRow + _rangeMinRow - pictureMaxRow - pictureMinRow)) &&  
116               (Math.Abs(_rangeMaxCol - _rangeMinCol) + Math.Abs(pictureMaxCol - pictureMinCol) >= Math.Abs(_rangeMaxCol + _rangeMinCol - pictureMaxCol - pictureMinCol)));  
117           }  
118       }  
119   }

获取图片信息

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原文地址：https://www.cnblogs.com/czblogs/p/7294809.html