優化後的代碼, 從DataTable導入60000(注意,是六萬)筆數據, 只要不到兩分鐘.
1public void WriteDataToSpreadsheet(SpreadsheetClass p_spreadsheet, DataTable p_dt,
2 int p_iRow, int p_iCol, bool p_bWithCaption, int p_iStaredRecord,
3 int p_iLimited, int[] p_iTextColumns)
4{
5 Worksheet f_sheet = p_spreadsheet.ActiveSheet;
6 int f_iRowCount = 0;
7 int f_iTotalRow = 0;
8 int f_iMaxRow = 65535;
9
10 int f_iRow, f_iCol, f_iDtColumn;
11
12 f_iRow = p_iRow;
13 f_iCol = p_iCol;
14
15 if (p_bWithCaption == true)
16 {
17 foreach (DataColumn f_col in p_dt.Columns)
18 {
19 f_sheet.Cells[f_iRow, f_iCol] = f_col.Caption;
20 f_iCol++;
21 }
22 f_iRow++;
23 f_iTotalRow++;
24
25 f_iCol = p_iCol;
26 }
27
28 string[] A2Z = new string[26] { "A", "B", "C", "D", "E", "F", "G",
29 "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
30 "S", "T", "U", "V", "W", "X", "Y", "Z" };
31 List<string> A2ZZ = new List<string>();
32 A2ZZ.AddRange(A2Z);
33 foreach (string en in A2Z)
34 {
35 foreach (string en2 in A2Z)
36 {
37 A2ZZ.Add(en + en2);
38 }
39 }
40 string lastColumnName = A2ZZ[p_dt.Columns.Count - 1];
41
42 List<object[,]> list = new List<object[,]>();
43 Range r = f_sheet.get_Range("A" + f_iRow.ToString(), lastColumnName + f_iRow.ToString());
44 int row = p_dt.Rows.Count;
45 int col = p_dt.Columns.Count;
46
47 if (row > 0)
48 {
49 //先將每一行資料放入一個數組,然後再放入清單
50 for (int i = 0; i < row; i++)
51 {
52 object[,] objData = new Object[1, col];
53 for (int j = 0; j < col; j++)
54 {
55 if (p_dt.Rows[i][j] != DBNull.Value)
56 {
57 if (Array.IndexOf(p_iTextColumns, j) > -1)
58 objData[0, j] = "'" + p_dt.Rows[i][j].ToString();
59 else
60 objData[0, j] = p_dt.Rows[i][j];
61 }
62 else objData[0, j] = "";
63 }
64 list.Add(objData);
65 }
66 }
67 object m_objOpt = System.Reflection.Missing.Value;
68 for (int i = 0; i < row; i++)
69 {
70 //直接到一個區間,然後對區間直接賦數組作為值, 這是真正提速的地方< span style="color: #008000;">
71 Range r2 = r.get_Range("A" + (f_iRowCount+1).ToString(), lastColumnName + (f_iRowCount+1).ToString());
72 r2.set_Value(m_objOpt, list[i]);
73
74 f_iRowCount++;
75 f_iTotalRow++;
76
77 if (f_iTotalRow >= f_iMaxRow)
78 break;
79
80 if (p_iLimited > 0)
81 {
82 if (f_iRowCount >= p_iLimited)
83 break;
84 }
85 f_iRow++;
86 f_iCol = p_iCol;
87 }
88 return;
89}
90
上面一些代碼是有其他用的, 大家只要看注釋那塊的就行了. 人太懶, 不好意思. 呵呵.
這個方法只是我在項目中使用的代碼, 時間比較緊, 肯定還有更快的方法, 如果各位有更好的方法, 請賜教.
