C# Excel com 对象的释放

最新推荐文章于 2024-12-05 10:31:48 发布

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最新推荐文章于 2024-12-05 10:31:48 发布

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文章标签： excel c# null string application object

本文链接：https://blog.youkuaiyun.com/liubaofeng28/article/details/6681457

本文介绍了一个用于管理Excel应用程序的单例类实现方法，包括如何创建和使用Excel.Workbook对象，以及如何打开、保存和关闭工作簿。

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当引用Excel Application和Workbook ,Worksheet 对象的时候不需要用Marchal.ReleaseComObject来释放引用。

用任务管理器观察释放不会较少内存。

只需最后的时候关闭Workbook即可。

下面为管理Excel的单例类

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using Excel = Microsoft.Office.Interop.Excel;

namespace SuperMap.DZBSFZ.Common
{
   public class ExcelApplicationManage
   {
   Excel.Application ExcelApp = null;
   static ExcelApplicationManage thisExcelApplicationManage = new ExcelApplicationManage();
   private object Nothing = System.Reflection.Missing.Value;
   /// <summary>
   /// 私有构造方法
   /// </summary>
   private ExcelApplicationManage()
   {
   }
   /// <summary>
   /// 获得单例类对象
   /// </summary>
   /// <returns></returns>
   public static ExcelApplicationManage GetInstance()
   {
   return thisExcelApplicationManage;
   }
   /// <summary>
   /// 初始化Excel.Application对象
   /// </summary>
   private void StartExcel()
   {
   if(ExcelApp==null)
   ExcelApp = new Excel.Application();
   }
   /// <summary>
   /// 得到一个只有Sheet1的工作簿
   /// </summary>
   /// <returns>Excel.Workbook对象</returns>
   public Excel.Workbook GetExcelBook()
   {
   if (ExcelApp == null)
   StartExcel();
   Excel.Workbook workbook = ExcelApp.Workbooks.Add(1);
   return workbook;
   }
   /// <summary>
   /// 根据名称打开Excel文件
   /// </summary>
   /// <param name="excelFileName">Excel文件名</param>
   /// <returns>Excel.Workbook对象</returns>
   public Excel.Workbook OpenExcelFile(string excelFileName)
   {
   if (!System.IO.File.Exists(excelFileName))
   return null;
   if(ExcelApp==null)
   StartExcel();
   Excel.Workbook Excelbook = null;
   try
   {
   Excelbook = ExcelApp.Workbooks.Open(excelFileName, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing);
   }
   catch
   {
   return null;
   }
   return Excelbook;
   }
   /// <summary>
   /// 根据名称得到Excel表单对象
   /// </summary>
   /// <param name="Excelbook">Excel.Workbook对象</param>
   /// <param name="sheetName">Sheet文件名,例如 Sheet1</param>
   /// <returns>Excel.Worksheet对象</returns>
   public Excel.Worksheet GetWorksheet(Excel.Workbook Excelbook, string sheetName)
   {
   if (Excelbook == null || sheetName == null || sheetName=="")
   return null;
   Excel.Worksheet ExcelSheet = null;
   try
   {
   ExcelSheet = (Excel.Worksheet)Excelbook.Worksheets.get_Item(sheetName);
   }
   catch
   {
   return null;
   }
   return ExcelSheet;
   }
   /// <summary>
   /// 关闭Excel.Workbook对象
   /// </summary>
   /// <param name="Excelbook">Excel.Workbook对象</param>
   /// <param name="bSave">是否保存</param>
   public void CloseWorkbook(ref Excel.Workbook Excelbook,bool bSave)
   {
   if (Excelbook == null)
   return;
   Excelbook.Close(bSave, null, null);
   Excelbook = null;
   }
   /// <summary>
   /// 另存Excel.Workbook对象
   /// </summary>
   /// <param name="Excelbook">Excel.Workbook对象</param>
   /// <param name="excelFileName">另存Excel文件名</param>
   /// <returns>是否成功</returns>
   public bool SaveAs(Excel.Workbook Excelbook, string excelFileName)
   {
   if (Excelbook == null || excelFileName == null || excelFileName == "")
   return false;
   try
   {
   Excelbook.SaveAs(excelFileName, Excel.XlFileFormat.xlWorkbookNormal, Nothing, Nothing, Nothing, Nothing, Excel.XlSaveAsAccessMode.xlNoChange, Nothing, Nothing, Nothing, Nothing, Nothing);
   }
   catch
   {
   return false;
   }
   return true;
   }
   /// <summary>
   /// 关闭Excel.Worksheet对象
   /// </summary>
   /// <param name="Excelsheet">Excel.Worksheet对象</param>
   public void CloseWorksheet(ref Excel.Worksheet Excelsheet)
   {
   if (Excelsheet == null)
   return;
   Excelsheet = null;
   }
   }
}