C# 连接Excel，获取表格数据，获取多个sheet中的数据，获取多个sheet名

　　　　 /// <summary>
        /// 获取Excel内容。
        /// </summary>
        /// <param name="sheetName">工作表名称，例：sheet1</param>
        /// <param name="filePath">Excel路径</param>
        /// <returns></returns>
        public static DataTable GetTableFromExcel(string sheetName, string filePath, string where = "")
        {
            string connStrTemplate = string.Empty;
            string fileType = System.IO.Path.GetExtension(filePath);
            if (string.IsNullOrEmpty(fileType)) return null;
            if (filePath == ".xls")
                connStrTemplate = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filePath + ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"";
            else
                connStrTemplate = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + filePath + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\"";
            //connStrTemplate = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filePath + ";" + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1\"";

            //const string connStrTemplate = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 12.0;HDR=Yes;\"";
            DataTable dt = null;
            if (!System.IO.File.Exists(filePath))
            {
                // don‘t find file
                return null;
            }
            OleDbConnection conn = new OleDbConnection(string.Format(connStrTemplate, filePath));
            try
            {
                conn.Open();
                if (sheetName == null || sheetName.Trim().Length == 0)
                {
                    DataTable schemaTable = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                    sheetName = schemaTable.Rows[0]["TABLE_NAME"].ToString().Trim();
                }

                OleDbDataAdapter da = null;
                DataSet ds = new DataSet(); ;
                string strSQL = "Select * From [" + sheetName + "$]";
                if (!string.IsNullOrWhiteSpace(where))
                {
                    strSQL = string.Format("Select * From [" + sheetName + "] Where {0}", where);
                }
                try
                {
                    da = new OleDbDataAdapter(strSQL, conn);
                    da.Fill(ds);
                }
                catch (Exception er)
                {
                    da = new OleDbDataAdapter("Select * From [sheet1$]", conn);
                    da.Fill(ds);
                }
                dt = ds.Tables[0];
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                conn.Close();
            }

            return dt;
        }

 /// <summary> 
        /// 获取sheet名
        /// </summary> 
        /// <param name="excelFile">Excel文件名及路径</param> 
        /// <returns></returns> 
        public static string[] GetExcelSheetNames(string fileName)
        {
            OleDbConnection objConn = null;
            System.Data.DataTable dt = null;
            try
            {
                string connString = string.Empty;
                string FileType = fileName.Substring(fileName.LastIndexOf("."));
                if (FileType == ".xls")
                    connString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
                       "Data Source=" + fileName + ";Extended Properties=Excel 8.0;";
                else//.xlsx
                    connString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + fileName + ";" + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1\"";
                // 创建连接对象 
                objConn = new OleDbConnection(connString);
                // 打开数据库连接 
                objConn.Open();
                // 得到包含数据架构的数据表 
                dt = objConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                if (dt == null)
                {
                    return null;
                }
                String[] excelSheets = new String[dt.Rows.Count];
                int i = 0;
                // 添加工作表名称到字符串数组 
                foreach (DataRow row in dt.Rows)
                {
                    string strSheetTableName = row["TABLE_NAME"].ToString();
                    //过滤无效SheetName
                    if (strSheetTableName.Contains("$") && strSheetTableName.Replace("‘", "").EndsWith("$"))
                    {
                        excelSheets[i] = strSheetTableName.Substring(0, strSheetTableName.Length - 1);
                    }
                    i++;
                }
                return excelSheets;
            }
            catch (Exception ex)
            {
                return null;
            }
            finally
            {
                // 清理 
                if (objConn != null)
                {
                    objConn.Close();
                    objConn.Dispose();
                }
                if (dt != null)
                {
                    dt.Dispose();
                }
            }
        }