OpenXML简介和生成Excel

  1  public class CreateXlsx
  2     {
  3         public static void Create(string filePath, DataTable dt)
  4         {
  5             SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create(filePath, SpreadsheetDocumentType.Workbook);
  6             WorkbookPart workbookpart = spreadsheetDocument.AddWorkbookPart();
  7             workbookpart.Workbook = new Workbook();
  8 
  9             WorksheetPart worksheetpart = workbookpart.AddNewPart<WorksheetPart>();
 10             worksheetpart.Worksheet = new Worksheet(new SheetData());
 11 
 12             Sheets sheets = workbookpart.Workbook.AppendChild<Sheets>(new Sheets());
 13             Sheet sheet = new Sheet();
 14             sheet.Id = workbookpart.GetIdOfPart(worksheetpart);
 15             sheet.SheetId = 1;
 16             sheet.Name = "sheet";
 17             sheets.Append(sheet);
 18 
 19             SheetData sheetdata = worksheetpart.Worksheet.GetFirstChild<SheetData>();
 20 
 21             string columnName = "";
 22             Cell cell = null;
 23             for (int i = 0; i < dt.Columns.Count; i++)
 24             {
 25                 columnName = ConvertToChar(i + 1);
 26                 cell = InsertCellInWorksheet(columnName, 1, sheetdata);
 27                 cell.CellValue = new CellValue(dt.Columns[i].ColumnName);
 28                 cell.DataType = new EnumValue<CellValues>(CellValues.String);
 29             }
 30             for (int i = 0; i < dt.Rows.Count; i++)
 31             {
 32                 for (int j = 0; j < dt.Columns.Count; j++)
 33                 {
 34                     columnName = ConvertToChar(j + 1);
 35                     cell = InsertCellInWorksheet(columnName, (uint)(i + 2), sheetdata);
 36                     cell.CellValue = new CellValue(dt.Rows[i][j].ToString());
 37                     cell.DataType = new EnumValue<CellValues>(CellValues.Number);
 38                 }
 39             }
 40 
 41             spreadsheetDocument.Close();
 42 
 43         }
 44 
 45         private static Cell InsertCellInWorksheet(string columnName, uint rowIndex, SheetData sheetData)
 46         {
 47             string cellReference = columnName + rowIndex;
 48 
 49             // If the worksheet does not contain a row with the specified row index, insert one.
 50             Row row;
 51             var count = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count();
 52             if (sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
 53             {
 54                 row = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
 55             }
 56             else
 57             {
 58                 row = new Row() { RowIndex = rowIndex };
 59                 sheetData.Append(row);
 60             }
 61 
 62             // If there is not a cell with the specified column name, insert one.  
 63             if (row.Elements<Cell>().Where(c => c.CellReference.Value == columnName + rowIndex).Count() > 0)
 64             {
 65                 return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
 66             }
 67             else
 68             {
 69                 // Cells must be in sequential order according to CellReference. Determine where to insert the new cell.
 70                 Cell refCell = null;
 71                 foreach (Cell cell in row.Elements<Cell>())
 72                 {
 73                     if (string.Compare(cell.CellReference.Value, cellReference, true) > 0)
 74                     {
 75                         refCell = cell;
 76                         break;
 77                     }
 78                 }
 79 
 80                 Cell newCell = new Cell() { CellReference = cellReference };
 81                 row.InsertBefore(newCell, refCell);
 82                 return newCell;
 83             }
 84         }
 85 
 86         private static string ConvertToChar(int value)
 87         {
 88             string rtn = string.Empty;
 89             List<int> iList = new List<int>();
 90 
 91             //To single Int
 92             while (value / 26 != 0 || value % 26 != 0)
 93             {
 94                 iList.Add(value % 26);
 95                 value /= 26;
 96             }
 97 
 98             //Change 0 To 26
 99             for (int j = 0; j < iList.Count - 1; j++)
100             {
101                 if (iList[j] == 0)
102                 {
103                     iList[j + 1] -= 1;
104                     iList[j] = 26;
105                 }
106             }
107             //Remove 0 at last
108             if (iList[iList.Count - 1] == 0)
109             {
110                 iList.Remove(iList[iList.Count - 1]);
111             }
112 
113             //To String
114             for (int j = iList.Count - 1; j >= 0; j--)
115             {
116                 char c = (char)(iList[j] + 64);
117                 rtn += c.ToString();
118             }
119 
120             return rtn;
121         }
122     }