标签：自定义 int EXCEL easyDataColumn 导出 var dt List public
在项目中经常会用到这种情况：前台通过easyui自定义页表格展示，然后再通过excel导出到本地。
项目中用的最多的就是多级表头的情况，在这里markI一下。
1、自定义列对象
1 public class EasyUIDataColumn
2 {
3
4 public string field { get; set; }
5
6 private int _colspan = 1;
7 private int _rowspan = 1;
8
9
10 public string align = "left";
11 public int colspan
12 {
13 get { return _colspan; }
14 set { _colspan = value; }
15 }
16 public int rowspan
17 {
18 get { return _rowspan; }
19 set { _rowspan = value; }
20 }
21
22 public string title;
23 private int _width;
24
25 public int width
26 {
27 get
28 {
29 if (_width == 0)
30 {
31 if (DicEasyUIColumnWidth.ContainsKey(title)) { return DicEasyUIColumnWidth[title]; }
32 return 20 * _colspan * (Encoding.Default.GetBytes(title).Length / 2);
33 }
34 else
35 {
36 return _width;
37 }
38 }
39 set
40 {
41 _width = value;
42 }
43
44 }
45
46
47 public static readonly char EasyUIColumnSplit = '_';
48
49 }
50 }
2.通过从数据库中得到的DataTable数据生成对应的List<List<EasyUIDataColumn>>对象
1 public List<List<EasyUIDataColumn>> GetEasyUIDataColumnList(string testID, DataTable dt, int frozenColumns = -1, bool isGetFrozenColumns = false)
2 {
3 List<List<EasyUIDataColumn>> arrEasyDataColumnList = new List<List<EasyUIDataColumn>>();
4 List<EasyUIDataColumn> EasyDataColumnList = new List<EasyUIDataColumn>();
5 List<EasyUIDataColumn> TitleColumnList = new List<EasyUIDataColumn>();
6 for (int i = 0; i < dt.Columns.Count; i++)
7 {
8 EasyUIDataColumn easyDataColumn = new EasyUIDataColumn();
9 easyDataColumn.width = 100;
10 if (isGetFrozenColumns)
11 {
12 if (i <= frozenColumns)
13 {
14 EasyUIDataColumn titleColumn = new EasyUIDataColumn();
15 titleColumn.rowspan = 2;
16 titleColumn.title = dt.Columns[i].ColumnName;
17 titleColumn.field = dt.Columns[i].ColumnName;
18 TitleColumnList.Add(titleColumn);
19 continue;
20 }
21 }
22 else
23 {
24 if (i <= frozenColumns)
25 {
26 continue;
27 }
28 }
29
30 if (i == 2||i==6)
31 {
32 EasyUIDataColumn titleColumn = new EasyUIDataColumn();
33 string[] columnName = dt.Columns[i].ColumnName.Split(EasyUIDataColumn.EasyUIColumnSplit);
34 titleColumn.colspan = 4;
35 titleColumn.title = columnName[0];
36 titleColumn.field = "";
37 TitleColumnList.Add(titleColumn);
38 }
39
40
41 if (dt.Columns[i].ColumnName.IndexOf(EasyUIDataColumn.EasyUIColumnSplit) > -1)
42 {
43 string[] columnName = dt.Columns[i].ColumnName.Split(EasyUIDataColumn.EasyUIColumnSplit);
44 easyDataColumn.title = columnName[1];
45 easyDataColumn.field = dt.Columns[i].ColumnName;
46 easyDataColumn.align = "center";
47 }
48 else
49 {
50 easyDataColumn.title = dt.Columns[i].ColumnName;
51 easyDataColumn.field = dt.Columns[i].ColumnName;
52 easyDataColumn.align = "center";
53 }
54 EasyDataColumnList.Add(easyDataColumn);
55 }
56 arrEasyDataColumnList.Add(TitleColumnList);
57 arrEasyDataColumnList.Add(EasyDataColumnList);
58 return arrEasyDataColumnList;
59 }
3.根据自定义的表格式生成excel
1 /// <summary>
2 /// 将DataTable数据导出到Excel文件中(xlsx),自定义列头
3 /// </summary>
4 /// <param name="dt"></param>
5 /// <param name="file"></param>
6 /// <param name="columnList">列集合</param>
7 /// <param name="frozenClounms">冻结列 或者 列表开始rowspan=2的列数 </param>
8 public void ExportDataTableToExcelForXLSXByCustomColumn(DataTable dt, string file,
9 List<List<EasyUIDataColumn>> columnList, int frozenClounms)
10 {
11 var xssfworkbook = new XSSFWorkbook();
12 ICellStyle styleColName = xssfworkbook.CreateCellStyle();
13 styleColName.Alignment = HorizontalAlignment.Center;
14 styleColName.VerticalAlignment = VerticalAlignment.Center;
15 var sheet = xssfworkbook.CreateSheet(dt.TableName); //sheet名
16 var firstrow = 0;
17 var lastrow = 0;
18 var firstcol = 0;
19 var lastcol = 0;
20 //表头
21 for (var i = 0; i < columnList.Count; i++)
22 {
23 var sumColSpan = 0;
24
25 for (var j = 0; j < columnList[i].Count; j++)
26 {
27 int tempRowSpan = columnList[i][j].rowspan == 0 ? 1 : columnList[i][j].rowspan;
28 firstrow = i;
29 lastrow = i + tempRowSpan - 1;
30
31 int tempColSpan = columnList[i][j].colspan == 0 ? 1 : columnList[i][j].colspan;
32 firstcol = j + sumColSpan;
33 lastcol = j + sumColSpan + tempColSpan - 1;
34 sumColSpan += (tempColSpan - 1);
35
36 MergeColumn(sheet, firstrow, lastrow, firstcol, lastcol, columnList[i][j].title, styleColName, frozenClounms);
37 }
38 }
39
40 sheet.SetColumnWidth(0, 15 * 256);
41 //写入数据
42 for (var i = 0; i < dt.Rows.Count; i++)
43 {
44 var row1 = sheet.CreateRow(i + 2);
45 for (var j = 0; j < dt.Columns.Count; j++)
46 {
47 var cell = row1.CreateCell(j);
48 if (IsNumeric(dt.Rows[i][j].ToString()))
49 {
50 cell.SetCellType(CellType.Numeric);
51 cell.SetCellValue(Convert.ToDouble(dt.Rows[i][j]));
52 }
53 else
54 {
55 cell.SetCellValue(dt.Rows[i][j].ToString());
56 }
57 }
58 }
59
60 //转为字节数组
61 var stream = new MemoryStream();
62 xssfworkbook.Write(stream);
63 var buf = stream.ToArray();
64
65 //保存为Excel文件
66 using (var fs = new FileStream(file, FileMode.Create, FileAccess.Write))
67 {
68 fs.Write(buf, 0, buf.Length);
69 fs.Close();
70 }
71 }
72
73 private void MergeColumn(ISheet sheet, int firstrow, int lastrow, int firstcol, int lastcol, string value, ICellStyle cellStyle, int frozenClounms)
74 {
75 //第二行，全部往前进frozenClounms个列
76 if (firstrow == 1)
77 {
78 firstcol += frozenClounms;
79 lastcol += frozenClounms;
80 }
81 for (var i = firstrow; i <= lastrow; i++)
82 {
83 for (var j = firstcol; j <= lastcol; j++)
84 {
85 if (j == firstcol)
86 {
87
88 LoadCell(sheet, i, j, cellStyle).SetCellValue(value);
89 }
90 else
91 {
92 LoadCell(sheet, i, j).SetCellValue("");
93 }
94 }
95 }
96 sheet.AddMergedRegion(new CellRangeAddress(firstrow, lastrow, firstcol, lastcol)); //合并单元格
97 }
98 private ICell LoadCell(ISheet sheet1, int rowIndex, int cellIndex, ICellStyle cellStyle = null)
99 {
100 var row = sheet1.GetRow(rowIndex) ?? sheet1.CreateRow(rowIndex);
101
102 var cell = row.GetCell(cellIndex);
103 if (cell == null)
104 {
105 cell = sheet1.GetRow(rowIndex).CreateCell(cellIndex);
106 }
107 cell.CellStyle = cellStyle;
108 return cell;
109 }
110
标签：自定义,int,EXCEL,easyDataColumn,导出,var,dt,List,public 来源： https://www.cnblogs.com/hobby0524/p/11904155.html
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