.net上传文件，利用npoi读取文件信息到datatable里

整理代码，.net上传文件，利用npoi读取文件到datatable里，使用了FileUpload控件，代码如下：

 protected void Button1_Click(object sender, EventArgs e)
 {
     try
     {
         #region 上传文件
         if (FileUpload1.HasFile)//判断是否存在上传文件
         FileUpload1.SaveAs(Server.MapPath("~/") + FileUpload1.FileName);
         else
         {
             ScriptManager.RegisterClientScriptBlock(this, GetType(), "aaa", "alert('上传文件不存在或上传文件为空，请检查文件');", true);
             return;
         }
         #endregion
         #region 读取文件
         DataTable dt = null;
         string fileEx = FileUpload1.FileName.Substring(FileUpload1.FileName.LastIndexOf(".") + );
         if (fileEx == "xls")
         {
             dt = IO.ImportExcelFile(Server.MapPath("~/") + FileUpload1.FileName);
         }
         else if (fileEx == "xlsx")
         {
             dt = IO.ImportExcelFilexlsx(Server.MapPath("~/") + FileUpload1.FileName);
         }
         if (dt.Rows.Count < )
         {
             ScriptManager.RegisterClientScriptBlock(this, GetType(), "aaa", "alert('上传文件为空，请检查文件内容');", true);
             return;
         }
         #endregion
     }
     catch (Exception ex)
     {
         ScriptManager.RegisterClientScriptBlock(this, GetType(), "aaa", "alert('系统异常，" + ex + "');", true);
     }
 }

npoi读取文件的方法：

 public static DataTable ImportExcelFile(string filePath)
 {
     HSSFWorkbook hssfworkbook;
     #region//初始化信息
     try
     {
         using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
         {
             hssfworkbook = new HSSFWorkbook(file);
         }
     }
     catch (Exception e)
     {
         throw e;
     }
     #endregion
     NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt();
     System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
     DataTable dt = new DataTable();
     for (int j = ; j < (sheet.GetRow().LastCellNum); j++)
     {
         dt.Columns.Add(sheet.GetRow().GetCell(j).ToString());
     }
     while (rows.MoveNext())
     {
         HSSFRow row = (HSSFRow)rows.Current;
         if (row.RowNum != )
         {
             DataRow dr = dt.NewRow();
             for (int i = ; i < row.LastCellNum; i++)
             {
                 NPOI.SS.UserModel.ICell cell = row.GetCell(i);
                 if (cell == null)
                 {
                     dr[i] = null;
                 }
                 else
                 {
                     dr[i] = cell.ToString();
                 }
             }
             dt.Rows.Add(dr);
         }
     }
     return dt;
 }
 public static DataTable ImportExcelFilexlsx(string filePath)
 {
     XSSFWorkbook hssfworkbook;
     #region//初始化信息
     try
     {
         using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
         {
             hssfworkbook = new XSSFWorkbook(file);
         }
     }
     catch (Exception e)
     {
         throw e;
     }
     #endregion
     NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt();
     System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
     DataTable dt = new DataTable();
     for (int j = ; j < (sheet.GetRow().LastCellNum); j++)
     {
         dt.Columns.Add(sheet.GetRow().GetCell(j).ToString());
     }
     while (rows.MoveNext())
     {
         XSSFRow row = (XSSFRow)rows.Current;
         if (row.RowNum != )
         {
             DataRow dr = dt.NewRow();
             for (int i = ; i < row.LastCellNum; i++)
             {
                 NPOI.SS.UserModel.ICell cell = row.GetCell(i);
                 if (cell == null)
                 {
                     dr[i] = null;
                 }
                 else
                 {
                     dr[i] = cell.ToString();
                 }
             }
             dt.Rows.Add(dr);
         }
     }
     return dt;
 }