Asp.net操作Excel文件事例小结，基于ExtAspNet控件库

SQL查询Excel文件的语句：
SELECT * FROM OPENDATASOURCE('Microsoft.Jet.OLEDB.4.0','Data Source=D:\hxl\gxjt\gxjt\pay\excel\list.xls;Extended Properties=Excel 8.0; HDR=YES;

IMEX=1')...Sheet1$

注：如遇到如下问题：

1）、已拒绝对 OLE DB 访问接口 'Microsoft.Jet.OLEDB.4.0' 的即席访问。必须通过链接服务器来访问此访问接口。

 　　答：登录数据库用户必须具有sa权限

1.把Excel里的数据转换为DataSet
方法一：
        /// <summary>
        /// 把Excel里的数据转换为DataSet，并返回DataSet,缺点：当Excel文件中有两列的名称一样，则第二列起名称自动在末尾加‘1’
        /// </summary>
        /// <param name="filenameurl">服务器上的路径</param>
        /// <param name="sheetname">sheet名称</param>
        /// <returns></returns>
        public DataSet ExecleToDataSet(string filenameurl, string sheetname)
        {
            string strConn = "Provider=Microsoft.Jet.OleDb.4.0;" + "data source=" + filenameurl + ";Extended Properties='Excel 8.0; HDR=YES; IMEX=1'";
            OleDbConnection conn = new OleDbConnection(strConn);
            OleDbDataAdapter odda = new OleDbDataAdapter("select * from [" + sheetname + "$]", conn);
            DataSet ds = new DataSet();
            odda.Fill(ds, sheetname);
            return ds;
        }
注：当Excel文件中有两列的名称一样，则第二列起名称自动在末尾加'1'

方法二：
        /// <summary>
        /// 把Excel里的数据转换为DataTable,应用引用的com组件：Microsoft.Office.Interop.Excel.dll 读取EXCEL文件
        /// </summary>
        /// <param name="filenameurl">物理路径</param>
        /// <param name="sheetIndex">sheet名称的索引</param>
        /// <param name="splitstr">如果是已存在列，则自定义添加的字符串</param>
        /// <returns></returns>
        public DataTable ExecleToDataSet(string filenameurl, int sheetIndex, string splitstr)
        {
            //
            bool isEqual = false;//不相等
            ArrayList columnArr = new ArrayList();//列字段表

            DataSet myDs = new DataSet();
            DataTable xlsTable = myDs.Tables.Add("show");

            object missing = System.Reflection.Missing.Value;
            Excel.ApplicationClass excel = new Excel.ApplicationClass();//lauch excel application
            if (excel == null)
            {
                Alert.Show("不能进入excel！");
            }
            else
            {
                excel.Visible = false;
                excel.UserControl = true;
                // 以只读的形式打开EXCEL文件
                Excel.Workbook wb = excel.Workbooks.Open(filenameurl, missing, true, missing, missing, missing,
                 missing, missing, missing, true, missing, missing, missing, missing, missing);
                //取得第一个工作薄
                Excel.Worksheet ws = (Excel.Worksheet)wb.Worksheets.get_Item(sheetIndex);

                //取得总记录行数(包括标题列)
                int rowsint = ws.UsedRange.Cells.Rows.Count; //得到行数
                int columnsint = ws.UsedRange.Cells.Columns.Count;//得到列数

                DataRow dr;
                for (int i = 1; i <= columnsint; i++)
                {
                    //判断是否有列相同
                    if (i >= 2)
                    {
                        int r = 0;
                        for (int k = 1; k <= i - 1; k++)//列从第一列到第i-1列遍历进行比较
                        {
                            if (((Excel.Range)ws.Cells[1, i]).Text.ToString() == ((Excel.Range)ws.Cells[1, k]).Text.ToString())
                            {
                                //如果该列的值等于前面列中某一列的值
                                xlsTable.Columns.Add(((Excel.Range)ws.Cells[1, i]).Text.ToString() + splitstr + (r+1).ToString(), typeof(string));
                                columnArr.Add(((Excel.Range)ws.Cells[1, i]).Text.ToString() + splitstr + (r + 1).ToString());
                                isEqual = true;
                                r++;
                                break;
                            }
                            else
                            {
                                isEqual = false;
                                continue;
                            }
                        }
                        if (!isEqual)
                        {
                            xlsTable.Columns.Add(((Excel.Range)ws.Cells[1, i]).Text.ToString(), typeof(string));
                            columnArr.Add(((Excel.Range)ws.Cells[1, i]).Text.ToString());
                        }

                    }
                    else
                    {
                        xlsTable.Columns.Add(((Excel.Range)ws.Cells[1, i]).Text.ToString(), typeof(string));
                        columnArr.Add(((Excel.Range)ws.Cells[1, i]).Text.ToString());
                    }
                }

                for (int i = 2; i <= rowsint; i++)
                {
                    dr = xlsTable.NewRow();
                    for (int j = 1; j <= columnsint; j++)
                    {
                        dr[columnArr[j - 1].ToString()] = ((Excel.Range)ws.Cells[i, j]).Text.ToString();
                    }
                    xlsTable.Rows.Add(dr);
                }
            }
            excel.Quit();
            excel = null;
            System.Diagnostics.Process[] procs = System.Diagnostics.Process.GetProcessesByName("EXCEL");

            foreach (System.Diagnostics.Process pro in procs)
            {
                pro.Kill();//没有更好的方法,只有杀掉进程
            }
            GC.Collect();
            return xlsTable;
        }

2.获取Excel文件的Sheet名称，并邦定到DropDownList

/*要引入命空间

using Excel = Microsoft.Office.Interop.Excel;
using System.Runtime.InteropServices;
using System.Reflection;

*/
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int id);
        /// <summary>
        /// 获取Excel文件的Sheet名称，并邦定到DropDownList
        /// </summary>
        /// <param name="FileFullName">服务器，物理路径 </param>
        protected void ExcelSheetToBind(string FileFullName)
        {
            string[] SplitString = FileFullName.Split('\\');
            string FileName = SplitString[SplitString.Length - 1].ToString();
            Excel.ApplicationClass oExcel = new Excel.ApplicationClass();
            Excel.Workbook oBook = oExcel.Workbooks.Open(FileFullName, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value,

Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
            try
            {
                DropDownList_datetable.Items.Clear();
                DropDownList_datetable.Items.Add("请选择工作表", "0");
                foreach (Microsoft.Office.Interop.Excel.Worksheet sheet in oBook.Sheets)
                {
                    DropDownList_datetable.Items.Add(new ExtAspNet.ListItem(sheet.Name, sheet.Name));
                }
            }
            catch
            {
            }
            finally
            {
                IntPtr t = new IntPtr(oExcel.Hwnd);
                int k = 0;
                GetWindowThreadProcessId(t, out k);
                System.Diagnostics.Process p = System.Diagnostics.Process.GetProcessById(k);
                p.Kill();
            }
        }