1
我试图写入现有的Excel文件,但发生了NullReferenceException
错误。我该怎么做才能解决它?NullReferenceException尝试写入已存在的Excel文件时
我参考Microsoft Excel 16.0 Object Library
。
这里就是我所做的:
Imports Excel = Microsoft.Office.Interop.Excel
Public Class manager
Dim oExcel As Excel.Application
Dim oBook As Excel.Workbook
Dim oSheet As Excel.Worksheet
Dim oRange As Excel.Range
Dim box1 As Integer = 0
Dim i As Integer = 2
Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
box1 = 1
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Try
oBook = oExcel.Workbooks.Open("C:\puthere.xlsx")
Catch ex As NullReferenceException
End Try
Try
oSheet = oBook.Worksheets("sheet1")
Catch ex As NullReferenceException
End Try
Try
oSheet.Range("B" & i).Value = box1
Catch ex As NullReferenceException
End Try
End Sub
End Class
我试图用一个Try-Catch
并成功阻止错误。但该程序不起作用。没有错误,但文件没有改变。当我将路径和文件名更改为不存在的路径和文件名时,程序会执行相同的操作(无错误,只是不写任何内容)。