asp.net上传Excel文件并读取内容，自定义上传控件样式

 1     <table>
 2         <tr>
 3             <td>
 4                 <span style="color: Red; clear: both; vertical-align: middle;">*</span> Excel文件：
 5             </td>
 6             <td>
 7                 <a>
 8                     <input type="text" id="des" readonly="readonly" />
 9                 </a>
10             </td>
11             <td>
12                 <asp:UpdatePanel ID="UpdatePanel1" runat="server">
13                     <ContentTemplate>
14                         <a href="javascript:;" id="aFileUpload" class="files">
15                             <input type="file" runat="server" id="FileUpload" title="Select file" name="FileUpload" onchange="document.getElementById(‘des‘).value=‘‘;if(this.files[0].name.indexOf(‘.xls‘)<=0){alert(‘Please select excel file !‘);
16                     document.getElementById(‘des‘).value=‘‘; this.value = null; return;};document.getElementById(‘des‘).value=this.files[0].name;" />
17                         </a>
18                     </ContentTemplate>
19                     <Triggers>
20                         <asp:PostBackTrigger ControlID="btnOK" />
21                     </Triggers>
22                 </asp:UpdatePanel>
23             </td>
24         </tr>
25         <tr>
26             <td></td>
27             <td>
28                 <asp:Button ID="btnOK" runat="server" Text="确定" OnClick="btnOK_Click" />
29             </td>
30         </tr>
31     </table>

 1 <style>
 2         /*file容器样式*/
 3         a.files {
 4             margin: 0 auto;
 5             float: left;
 6             width: 30px;
 7             height: 30px;
 8             overflow: hidden;
 9             display: block;
10             border: 1px solid #d7d7d7;
11             background: url(browse-l.png) left top no-repeat;
12             text-decoration: none;
13         }
14             /*file设为透明，并覆盖整个触发面*/
15             a.files input {
16                 margin-left: -270px;
17                 font-size: 24px;
18                 cursor: pointer;
19                 filter: alpha(opacity=0);
20                 opacity: 0;
21             }
22             /*取消点击时的虚线框*/
23             a.files, a.files input {
24                 outline: none; /*ff*/
25                 hide-focus: expression(this.hideFocus=true); /*ie*/
26             }
27     </style>

 1 protected void btnOK_Click(object sender, EventArgs e)
 2         {
 3             string toFileFullPath = "";        //物理完整路径
 4             string filePath = "";     //上传后的文件路径
 5             if (HttpContext.Current != null)
 6                 toFileFullPath = HttpContext.Current.Server.MapPath("~");
 7             //检查是否有该路径，没有就创建
 8             if (!Directory.Exists(toFileFullPath))
 9                 Directory.CreateDirectory(toFileFullPath);
10             HttpFileCollection files = Request.Files;
11             if (files.Count > 0)
12             {
13                 string fileName = files[0].FileName;
14                 string ext = System.IO.Path.GetExtension(fileName);//获取后缀名
15                 if (ext == ".xlsx")
16                     fileName = "更改的名称.xlsx";
17                 else if (ext == ".xls")
18                     fileName = "更改的名称.xls";
19                 filePath = Path.Combine(toFileFullPath, fileName);
20                 files[0].SaveAs(filePath);
21             }
22             DataSet ds = ExcelToDataSet(filePath);
23             for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
24             {
25                 //只能读取有表头的列
26                 Response.Write(ds.Tables[0].Rows[i][0].ToString());//获取第一列数据
27                 Response.Write(ds.Tables[0].Rows[i][1].ToString());//获取第二列数据
28             }
29         }
30 
31         /// <summary>
32         /// 功能：导入Excel
33         /// 方式：NPOI
34         /// 支持格式：支持xls和xlsx格式
35         /// 调用注意：默认第一行为表头，从第2行开始读取数据
36         /// </summary>
37         /// <param name="strFileName">excel 文件路径</param>
38         /// <returns></returns>
39         private DataSet ExcelToDataSet(string strFileName)
40         {
41             ISheet sheet = null;
42             DataSet ds = new DataSet();
43             DataTable dt = new DataTable();
44             IWorkbook workbook = null;
45             try
46             {
47                 FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read);
48                 //if (strFileName.IndexOf(".xlsx") > 0) // 2007版本
49                 //    workbook = new XSSFWorkbook(file);
50                 //else if (strFileName.IndexOf(".xls") > 0) // 2003版本
51                 //    workbook = new HSSFWorkbook(file);
52                 workbook = WorkbookFactory.Create(file);
53                 //获取sheet
54                 sheet = workbook.GetSheetAt(0);
55                 if (sheet != null)
56                 {
57                     IRow headerRow = sheet.GetRow(0);
58                     int cellCount = headerRow.LastCellNum; //一行最后一个cell的编号 即总的列数
59                     for (int j = 0; j < cellCount; j++)
60                     {
61                         ICell cell = headerRow.GetCell(j);
62                         if (cell == null)
63                         {
64                             string strColumnName = (j++).ToString(); //判断如果第一列之后还存在多列，列名必须不同，否则报错
65                             dt.Columns.Add(strColumnName);
66                             continue;
67                         }
68                         dt.Columns.Add(cell.ToString());
69                     }
70                     for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
71                     {
72                         IRow row = sheet.GetRow(i);
73                         DataRow dataRow = dt.NewRow();
74                         if (row != null)
75                         {
76                             for (int j = row.FirstCellNum; j < cellCount; j++)
77                             {
78                                 if (row.GetCell(j) != null)
79                                     dataRow[j] = row.GetCell(j).ToString();
80                             }
81                             dt.Rows.Add(dataRow);
82                         }
83                     }
84                     ds.Tables.Add(dt);
85                 }
86                 return ds;
87             }
88             catch (Exception ex)
89             {
90                 Console.WriteLine("Exception: " + ex.Message);
91                 return null;
92             }
93         }