用C＃将数据写入现有的Excel文件

我想写数据到现有的Excel文件。 该文件有sheet1，我想写在sheet2上，然后保存。 问题是，我每次保存它将创build一个新的Excel文件，并覆盖现有的一个。 任何帮助保存旧数据，而保存。

我有以下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(); } } } } 

Answer 1

这是我的方式来添加数据到现有的Excel文件:(它非常简单和高效）

1 – 添加Microsoft.Office.Interop.Excel组件作为您的应用程序的参考您可以在.Net FrameWork in Extensions部分find它

2-然后添加：

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

3-现在我有一个简单的类3种方法（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 } } } } 

Answer 2

根据编程插入现有的Excel文件使用C＃R Manimaran ：

这里是将在已经存在的excel文件中插入的代码。

 private static Microsoft.Office.Interop.Excel.Workbook mWorkBook; private static Microsoft.Office.Interop.Excel.Sheets mWorkSheets; private static Microsoft.Office.Interop.Excel.Worksheet mWSheet1; private static Microsoft.Office.Interop.Excel.Application oXL; public static void ReadExistingExcel() { string path = @"C:\Tool\Reports1.xls"; oXL = new Microsoft.Office.Interop.Excel.Application(); oXL.Visible = true; oXL.DisplayAlerts = false; mWorkBook = oXL.Workbooks.Open(path, 0, false, 5, "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false); //Get all the sheets in the workbook mWorkSheets = mWorkBook.Worksheets; //Get the allready exists sheet mWSheet1 = (Microsoft.Office.Interop.Excel.Worksheet)mWorkSheets.get_Item("Sheet1"); Microsoft.Office.Interop.Excel.Range range= mWSheet1.UsedRange; int colCount = range.Columns.Count; int rowCount= range.Rows.Count; for (int index = 1; index < 15; index++) { mWSheet1.Cells[rowCount + index, 1] = rowCount +index; mWSheet1.Cells[rowCount + index, 2] = "New Item"+index; } mWorkBook.SaveAs(path, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, Missing.Value, Missing.Value, Missing.Value, Missing.Value,Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value); mWorkBook.Close(Missing.Value, Missing.Value, Missing.Value); mWSheet1 = null; mWorkBook = null; oXL.Quit(); GC.WaitForPendingFinalizers(); GC.Collect(); GC.WaitForPendingFinalizers(); GC.Collect(); } 

如果您需要创build新的工作表，请使用以下代码。

 oSheet = (Excel.Worksheet)oWB.Sheets.Add(Missing.Value, Missing.Value, Missing.Value, Missing.Value); oSheet.Name = SheetName;