C#文件處理（上傳、導入）

using System;
using System.Configuration;
using System.Data;
using System.Data.OleDb;
using System.IO;
using System.Reflection;
using System.Web;

using log4net;
using Excel = Microsoft.Office.Interop.Excel;

namespace TMS.IMEX
{
    public class IMEXImportBase
    {
        private static readonly ILog m_log = LogManager.GetLogger(typeof(IMEXImportBase));

        #region 處理上傳的文件
        /// <summary>
        /// 處理上傳的文件
        /// </summary>
        /// <param name="fileData"></param>
        /// <returns></returns>
        protected string ProcessUploadFile(HttpPostedFileBase fileData)
        {
            m_log.Debug("IMEXImportBase->ProcessUploadFile Start");

            try
            {
                // 絕對路徑文件名
                string fullFileName = string.Empty;

                // 原始文件名
                string oldFilename = Path.GetFileNameWithoutExtension(fileData.FileName);

                // 獲得文件擴展名
                string fileExtension = Path.GetExtension(fileData.FileName);

                // 新文件名
                string newFileName = oldFilename + "_" + DateTime.Now.ToString("yyyyMMddHHmmssffffff") + fileExtension;

                // 保存的物理路徑
                string phyPath = ConfigurationSettings.AppSettings["uploadFilePath"];

                // 如果物理路徑不存在,則創建路徑
                if (!Directory.Exists(phyPath))
                {
                    Directory.CreateDirectory(phyPath);
                }

                fullFileName = phyPath + "\\" + newFileName;

                fileData.SaveAs(fullFileName);

                return fullFileName;
            }
            catch (Exception ex)
            {
                m_log.Error("IMEXImportBase->ProcessUploadFile Error:", ex);
                throw new Exception(ex.Message);
            }
            finally
            {
                m_log.Debug("IMEXImportBase->ProcessUploadFile End");
            }

        }

        #endregion

        #region 讀取Excel數據
        /// <summary>
        /// 讀取Excel數據
        /// </summary>
        /// <param name="fullFileName"></param>
        /// <param name="sheetName"></param>
        /// <returns></returns>
        protected DataTable ReadExcelData(string fullFileName, string sheetName)
        {
            m_log.Debug("IMEXImportBase->ReadExcelData Start");
            string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Extended Properties='Excel 12.0;IMEX=1';" + "data source=" + fullFileName;

            OleDbConnection conn = new OleDbConnection(connStr);
            OleDbDataAdapter odda = new OleDbDataAdapter("select * from [" + sheetName + "]", conn);

            DataSet ds = new DataSet();
            odda.Fill(ds, sheetName);

            m_log.Debug("IMEXImportBase->ReadExcelData End");
            return ds.Tables[sheetName];
        }

        #endregion

        #region 讀取Excel數據
        /// <summary>
        /// 讀取Excel數據
        /// </summary>
        /// <param name="fullFileName"></param>
        /// <returns></returns>
        protected object[,] ReadExcelData(string fullFileName)
        {
            Excel.Application app = null;
            Excel.Workbook book = null;
            Excel.Worksheet sheet = null;
            try
            {
                m_log.Debug("IMEXImportBase->ReadExcelData Start");
                app = new Excel.Application();
                book =
                   (Excel.Workbook)
                   app.Workbooks.Open(fullFileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                                      Type.Missing, Type.Missing,
                                      Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                                      Type.Missing, Type.Missing, Type.Missing);

                sheet = (Excel.Worksheet)book.Sheets[1];

                var data = sheet.UsedRange.Value[Missing.Value] as object[,];

                return data;
            }
            catch (Exception ex)
            {
                m_log.Error("IMEXExportBase->ReadExcelData" + ex.Message);
                throw new Exception("IMEXExportBase->ReadExcelData():Failed", ex);
            }
            finally
            {
                //關閉Excel進程
                if (sheet != null)
                {
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
                }
                if (book != null)
                {
                    book.Close(false, Missing.Value, Missing.Value);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
                }
                if (app != null)
                {
                    app.Quit();
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
                }
                GC.Collect();

                m_log.Debug("IMEXImportBase->ReadExcelData End");
            }
        }

        #endregion

        #region 處理上傳的文件
        /// <summary>
        /// 處理上傳的文件
        /// </summary>
        /// <param name="fileData"></param>
        /// <param name="fileName">保存的文件名</param>
        /// <param name="phyPath">保存的物理路徑</param>
        /// <returns></returns>
        protected string ProcessUploadImg(HttpPostedFileBase fileData, string fileName, string phyPath)
        {
            m_log.Debug("IMEXImportBase->ProcessUploadImg Start");

            try
            {
                // 獲得文件擴展名
                string fileExtension = Path.GetExtension(fileData.FileName);

                // 新文件名
                string newFileName = fileName + fileExtension;

                // 如果物理路徑不存在,則創建路徑
                if (!Directory.Exists(phyPath))
                {
                    Directory.CreateDirectory(phyPath);
                }

                // 絕對路徑文件名
                string fullFileName = phyPath + "\\" + newFileName;

                // 刪除文件
                DeleteFile(phyPath, fileName);

                fileData.SaveAs(fullFileName);

                return fullFileName;
            }
            catch (Exception ex)
            {
                m_log.Error("IMEXImportBase->ProcessUploadImg Error:", ex);
                throw new Exception(ex.Message);
            }
            finally
            {
                m_log.Debug("IMEXImportBase->ProcessUploadImg End");
            }

        }
        #endregion

        #region 刪除文件
        /// <summary>
        /// 刪除文件
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public void DeleteFile(string filePath, string fileName)
        {
            var directory = new DirectoryInfo(@filePath);
            var files = directory.GetFiles(fileName + ".*");
            foreach (var file in files)
            {
                file.Delete();
            }
        }
        #endregion

    }
}