.Net core 使用NPOI 直接导入Excel到数据库（即不先将Excel保存到服务器再读取文件到数据库）
作者：互联网
原文:.Net core 使用NPOI 直接导入Excel到数据库（即不先将Excel保存到服务器再读取文件到数据库）
1 /// <summary>
2 /// 导入信息
3 /// </summary>
4 /// <param name="file"></param>
5 /// <returns></returns>
6 /// /Public/PublicPool/ImportCustomer
7 public ResultData ImportCustomer(IFormFile file)
8 {
9 ResultData resultData = new ResultData();
10 if (file.Length > 0)
11 {
12 DataTable dt = new DataTable();
13 string strMsg;
14 //利用IFormFile里面的OpenReadStream()方法直接读取文件流
15 dt = ExcelHelper.ExcelToDatatable(file.OpenReadStream(), Path.GetExtension(file.FileName), out strMsg);
16 if (!string.IsNullOrEmpty(strMsg))
17 {
18 resultData.Code = -1;
19 resultData.Msg = strMsg;
20 return resultData;
21 }
22 if (dt.Rows.Count > 0)
23 {
24 }
25 else
26 {
27 resultData.Code = -1;
28 resultData.Msg = "Excel导入表无数据!";
29 }
30 return resultData;
31 }
32
33 using NPOI.HSSF.UserModel;
34 using NPOI.SS.UserModel;
35 using NPOI.XSSF.UserModel;
36 using System;
37 using System.Collections.Generic;
38 using System.Data;
39 using System.IO;
40 using System.Text;
41
42 namespace CRM.Common
43 {
44 public static class ExcelHelper
45 {
46 /// <summary>
47 /// 将Excel单表转为Datatable
48 /// </summary>
49 /// <param name="stream"></param>
50 /// <param name="fileType"></param>
51 /// <param name="strMsg"></param>
52 /// <param name="sheetName"></param>
53 /// <returns></returns>
54 public static DataTable ExcelToDatatable(Stream stream, string fileType, out string strMsg, string sheetName = null)
55 {
56 strMsg = "";
57 DataTable dt = new DataTable();
58 ISheet sheet = null;
59 IWorkbook workbook = null;
60 try
61 {
62 #region 判断excel版本
63 //2007以上版本excel
64 if (fileType == ".xlsx")
65 {
66 workbook = new XSSFWorkbook(stream);
67 }
68 //2007以下版本excel
69 else if (fileType == ".xls")
70 {
71 workbook = new HSSFWorkbook(stream);
72 }
73 else
74 {
75 throw new Exception("传入的不是Excel文件！");
76 }
77 #endregion
78 if (!string.IsNullOrEmpty(sheetName))
79 {
80 sheet = workbook.GetSheet(sheetName);
81 if (sheet == null)
82 {
83 sheet = workbook.GetSheetAt(0);
84 }
85 }
86 else
87 {
88 sheet = workbook.GetSheetAt(0);
89 }
90 if (sheet != null)
91 {
92 IRow firstRow = sheet.GetRow(0);
93 int cellCount = firstRow.LastCellNum;
94 for (int i = firstRow.FirstCellNum; i < cellCount; i++)
95 {
96 ICell cell = firstRow.GetCell(i);
97 if (cell != null)
98 {
99 string cellValue = cell.StringCellValue.Trim();
100 if (!string.IsNullOrEmpty(cellValue))
101 {
102 DataColumn dataColumn = new DataColumn(cellValue);
103 dt.Columns.Add(dataColumn);
104 }
105 }
106 }
107 DataRow dataRow = null;
108 //遍历行
109 for (int j = sheet.FirstRowNum + 1; j <= sheet.LastRowNum; j++)
110 {
111 IRow row = sheet.GetRow(j);
112 dataRow = dt.NewRow();
113 if (row == null || row.FirstCellNum < 0)
114 {
115 continue;
116 }
117 //遍历列
118 for (int i = row.FirstCellNum; i < cellCount; i++)
119 {
120 ICell cellData = row.GetCell(i);
121 if (cellData != null)
122 {
123 //判断是否为数字型，必须加这个判断不然下面的日期判断会异常
124 if (cellData.CellType == CellType.Numeric)
125 {
126 //判断是否日期类型
127 if (DateUtil.IsCellDateFormatted(cellData))
128 {
129 dataRow[i] = cellData.DateCellValue;
130 }
131 else
132 {
133 dataRow[i] = cellData.ToString().Trim();
134 }
135 }
136 else
137 {
138 dataRow[i] = cellData.ToString().Trim();
139 }
140 }
141 }
142 dt.Rows.Add(dataRow);
143 }
144 }
145 else
146 {
147 throw new Exception("没有获取到Excel中的数据表！");
148 }
149 }
150 catch (Exception ex)
151 {
152 strMsg = ex.Message;
153 }
154 return dt;
155 }
156 }
157 }
网上找了好多都没有直接保存导数据库的方法，自己研究了IFormFile类后尝试了一下没想到意外的成功了~~~~~~~~~~
标签：core,sheet,string,resultData,数据库,Excel,new,using 来源： https://www.cnblogs.com/lonelyxmas/p/12037639.html