我的程序结构出了问题。每当我在我的 Windows 窗体应用程序中按下一个按钮时，我的 Excel 工作表应该用数据更新一个单元格。
这是我的代码:
using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
namespace Test6attendance
{
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;
if (File.Exists("D:\\login.xlscsharp-Excel.xls"))
{
object misValue = System.Reflection.Missing.Value;
xlApp = new Excel.Application();
xlWorkBook = xlApp.Workbooks.Open("D:\\login.xlscsharp-Excel.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);
for (int i = 1; i < 55555; i++)
{
if (xlWorkSheet.Cells[i, 1] == null)
{
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
xlWorkSheet.Cells[i, 1] = DateTime.Now.ToString("MM/dd/ yyyy, hh:mm:ss tt");
xlWorkBook.SaveAs("D:\\login.xlscsharp-Excel.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);
MessageBox.Show("Excel file updated , you can find the file D:\\csharp-Excel.xls");
}
}
}
else
{
//Create New Code
object misValue = System.Reflection.Missing.Value;
xlApp = new Excel.Application();
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
xlWorkSheet.Cells[1, 1] = DateTime.Now.ToString("MM/dd/ yyyy, hh:mm:ss tt");
xlWorkBook.SaveAs("D:\\login.xlscsharp-Excel.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);
MessageBox.Show("Excel file created , you can find the file D:\\csharp-Excel.xls");
}
}
private void releaseObject(object obj)
{
try
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
obj = null;
}
catch (Exception ex)
{
obj = null;
MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
}
finally
{
GC.Collect();
}
}
private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
{
}
}
}
我认为问题出在 for 循环上，它似乎不起作用。需要一些建议或引用来修复它。
最佳答案
问题出在
if (xlWorkSheet.Cells[i, 1] == null)
应该是
if (xlWorkSheet.Cells[i, 1] == null)
由于您的第一个 if 条件检查文件是否存在 if (File.Exists("D:\\login.xlscsharp-Excel.xls"))，如果不存在则创建一个文件并分配单元格 [1,1] 的值。现在，当您第二次单击时，单元格不为空并且您的值不会更新。
试试这段代码
for (int i = 1; i < 55555; i++)
{
if (xlWorkSheet.Cells[i, 1] != null)
{
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
xlWorkSheet.Cells[i, 1] = DateTime.Now.ToString("MM/dd/ yyyy, hh:mm:ss tt");
xlWorkBook.SaveAs("D:\\login.xlscsharp-Excel.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);
MessageBox.Show("Excel file updated , you can find the file D:\\csharp-Excel.xls");
break;
}
}
关于c# - 用 C# 填充 excel 表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23928146/