将数据写入在C＃中现有的Excel文件 [英] Writing Data to an Existing Excel File in C#

问题描述

我想将数据写入到现有的Excel文件。
该文件有Sheet1中，我想写的Sheet2中，然后保存。
问题是，我每次保存它会创建一个新的Excel文件并覆盖现有之一。任何有助于保持旧数据，保存。

我有以下功能

 使用System.Windows.Forms的;
使用Excel =的Microsoft.Office.Interop.Excel;命名空间的WindowsApplication1
{
    公共部分Form1类：表格
    {
        公共Form1中（）
        {
            的InitializeComponent（）;
        }        私人无效的button1_Click（对象发件人，EventArgs的发送）
        {
            Excel.Application xlApp;
            Excel.Workbook xlWorkBook;
            Excel.Worksheet xlWorkSheet;
            反对misValue = System.Reflection.Missing.Value;            xlApp =新Excel.ApplicationClass（）;
            xlWorkBook = xlApp.Workbooks.Open（csharp.net-informations.xls，0​​，真实，5，，，真实，Microsoft.Office.Interop.Excel.XlPlatform.xlWindows，\\ t的，假的，假0，真的，1，0）;
            xlWorkSheet =（Excel.Worksheet）xlWorkBook.Worksheets.get_Item（1）;            MessageBox.Show（xlWorkSheet.get_Range（A1，A1）Value2.ToString（））;            xlWorkBook.Close（真，misValue，misValue）;
            xlApp.Quit（）;            releaseObject（xlWorkSheet）;
            releaseObject（xlWorkBook）;
            releaseObject（xlApp）;
        }        私人无效releaseObject（obj对象）
        {
            尝试
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject（OBJ）;
                OBJ = NULL;
            }
            赶上（异常前）
            {
                OBJ = NULL;
                MessageBox.Show（无法释放对象+ ex.ToString（））;
            }
            最后
            {
                所以GC.Collect（）;
            }
        }
    }
}
 

解决方案

这是我的方式将数据添加到现有的excel文件：（它非常简单而有效的）

1 - 添加的Microsoft.Office.Interop.Excel组件为您的应用程序的引用
    你可以找到它在.NET框架的扩展部分

2 - 然后添加：

 使用Excel =的Microsoft.Office.Interop.Excel;
使用的System.Reflection;
 

3现在我有3种方法（openExcel，addDataToExcel，closeExcel）一个简单的类

 公共类ExcelFile
{    私人字符串excelFilePath =的String.Empty;
    私人INT ROWNUMBER = 1; //定义第一个行号在Excel中输入数据    Excel.Application myExcelApplication;
    Excel.Workbook myExcelWorkbook;
    Excel.Worksheet myExcelWorkSheet;    公共字符串ExcelFilePath
    {
        {返回excelFilePath; }
        集合{excelFilePath =价值; }
    }    公众诠释ROWNUMBER
    {
        {返回ROWNUMBER; }
        集合{ROWNUMBER =价值; }
    }    公共无效openExcel（）
    {
        myExcelApplication = NULL;        myExcelApplication =新Excel.Application（）; //创建的Excell应用
        myExcelApplication.DisplayAlerts = FALSE; //关闭警报
        myExcelWorkbook =（Excel.Workbook）（myExcelApplication.Workbooks._Open（excelFilePath，System.Reflection.Missing.Value，
           System.Reflection.Missing.Value，System.Reflection.Missing.Value，System.Reflection.Missing.Value，
           System.Reflection.Missing.Value，System.Reflection.Missing.Value，System.Reflection.Missing.Value，
           System.Reflection.Missing.Value，System.Reflection.Missing.Value，System.Reflection.Missing.Value，
           System.Reflection.Missing.Value，System.Reflection.Missing.Value））; //打开现有的excel文件        INT numberOfWorkbooks = myExcelApplication.Workbooks.Count; //获取工作簿号（可选）        myExcelWorkSheet =（Excel.Worksheet）myExcelWorkbook.Worksheets [1]; //定义在工作表中，你想添加数据
        myExcelWorkSheet.Name =工作1; //为工作表定义一个名称（optinal）        INT numberOfSheets = myExcelWorkbook.Worksheets.Count; //获取工作表数（可选）
    }    公共无效addDataToExcel（串名字，姓氏字符串，字符串语言，字符串email，字符串公司）
    {        myExcelWorkSheet.Cells [ROWNUMBER，H] =名字;
        myExcelWorkSheet.Cells [ROWNUMBER，J] =姓氏;
        myExcelWorkSheet.Cells [ROWNUMBER，Q] =语言;
        myExcelWorkSheet.Cells [ROWNUMBER，BH] =电子邮件;
        myExcelWorkSheet.Cells [ROWNUMBER，CH] =公司;
        ROWNUMBER ++; //如果你把这个方法的循环中，你应该用一个或笏增加ROWNUMBER永远是你的逻辑    }    公共无效closeExcel（）
    {
        尝试
        {
            myExcelWorkbook.SaveAs（excelFilePath，System.Reflection.Missing.Value，System.Reflection.Missing.Value，System.Reflection.Missing.Value，
                                           System.Reflection.Missing.Value，System.Reflection.Missing.Value，Excel.XlSaveAsAccessMode.xlNoChange，
                                           System.Reflection.Missing.Value，System.Reflection.Missing.Value，System.Reflection.Missing.Value，
                                           System.Reflection.Missing.Value，System.Reflection.Missing.Value）;在Excel //保存数据
            myExcelWorkbook.Close（真，excelFilePath，System.Reflection.Missing.Value）; //关闭工作表
        }
        最后
        {
            如果（myExcelApplication！= NULL）
            {
                myExcelApplication.Quit（）; //关闭Excel应用程序
            }
        }    }
}
 

i want to write data to existing excel file. the file have sheet1, i want to write on sheet2, then save. the problem is that every time i save it will create a new excel file and overwrite the existing one. any help to keep the old data while saving.

i have the following function

using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel; 

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Excel.Application xlApp ;
            Excel.Workbook xlWorkBook ;
            Excel.Worksheet xlWorkSheet ;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Excel.ApplicationClass();
            xlWorkBook = xlApp.Workbooks.Open("csharp.net-informations.xls", 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            MessageBox.Show(xlWorkSheet.get_Range("A1","A1").Value2.ToString());

            xlWorkBook.Close(true, misValue, misValue);
            xlApp.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);
        }

        private void releaseObject(object obj)
        {
            try
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
                MessageBox.Show("Unable to release the Object " + ex.ToString());
            }
            finally
            {
                GC.Collect();
            }
        } 
    }
}

解决方案

This is my way to add data to existing excel file: (Its very simple and efficient)

1 - Add Microsoft.Office.Interop.Excel component as a reference to your application You can find it in .Net FrameWork in Extensions section

2- then add:

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

3- Now I have a simple class with 3 methods (openExcel, addDataToExcel, closeExcel)

public class ExcelFile
{

    private string excelFilePath = string.Empty;
    private int rowNumber = 1; // define first row number to enter data in excel

    Excel.Application myExcelApplication;
    Excel.Workbook myExcelWorkbook;
    Excel.Worksheet myExcelWorkSheet;

    public string ExcelFilePath
    {
        get { return excelFilePath; }
        set { excelFilePath = value; }
    }

    public int Rownumber
    {
        get { return rowNumber; }
        set { rowNumber = value; }
    }

    public void openExcel()
    {
        myExcelApplication = null;

        myExcelApplication = new Excel.Application(); // create Excell App
        myExcelApplication.DisplayAlerts = false; // turn off alerts


        myExcelWorkbook = (Excel.Workbook)(myExcelApplication.Workbooks._Open(excelFilePath, System.Reflection.Missing.Value,
           System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
           System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
           System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
           System.Reflection.Missing.Value, System.Reflection.Missing.Value)); // open the existing excel file

        int numberOfWorkbooks = myExcelApplication.Workbooks.Count; // get number of workbooks (optional)

        myExcelWorkSheet = (Excel.Worksheet)myExcelWorkbook.Worksheets[1]; // define in which worksheet, do you want to add data
        myExcelWorkSheet.Name = "WorkSheet 1"; // define a name for the worksheet (optinal)

        int numberOfSheets = myExcelWorkbook.Worksheets.Count; // get number of worksheets (optional)
    }

    public void addDataToExcel(string firstname, string lastname, string language, string email, string company)
    {

        myExcelWorkSheet.Cells[rowNumber, "H"] = firstname;
        myExcelWorkSheet.Cells[rowNumber, "J"] = lastname;
        myExcelWorkSheet.Cells[rowNumber, "Q"] = language;
        myExcelWorkSheet.Cells[rowNumber, "BH"] = email;
        myExcelWorkSheet.Cells[rowNumber, "CH"] = company;
        rowNumber++;  // if you put this method inside a loop, you should increase rownumber by one or wat ever is your logic

    }

    public void closeExcel()
    {
        try
        {
            myExcelWorkbook.SaveAs(excelFilePath, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                                           System.Reflection.Missing.Value, System.Reflection.Missing.Value, Excel.XlSaveAsAccessMode.xlNoChange,
                                           System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                                           System.Reflection.Missing.Value, System.Reflection.Missing.Value); // Save data in excel


            myExcelWorkbook.Close(true, excelFilePath, System.Reflection.Missing.Value); // close the worksheet


        }
        finally
        {
            if (myExcelApplication != null)
            {
                myExcelApplication.Quit(); // close the excel application
            }
        }

    }
}

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