I have an excel sheet that I am reading. it contains multiple rows (No headers) each row containing a different number of populated columns. i.e. row 1 has data in the first three columns. row 2 has data in the first 140 columns. row 3 has data in the first 32 columns. etc etc.
If I need to find out how many columns row 2 uses (How many contain data), how would I start.
I am teaching myself c sharp at the moment and am jargon illiterate, so please be as "Layman" as possible.
Any help would be greatly appreciated.
Thank you.
Edit ------------------------
Had a quick look through some bookmarks and have a rough idea of the code i used to get the row number containing the columns i need to count. (i cant test as i don't have VS installed at home. so dont take this as gospel, but it seems "approximately" correct, sorry.)
v = [1 2 3 4 5 6 7];
inpt_img = imread('A10001.png');
[out_img , a_out] = image_filtering (v (:,:),inpt_img);
from here i need to find the number of used columns in row CurrentFind.
--------------------Edit-------------------------------- Finally back in the office, This was the code i had to find the row number;
private static Excel.Application HCObjApp = null;
private static Excel.Workbook HCBook = null;
private static Excel.Worksheet HCSheet = null;
XLApp = new Excel.Application();
HCBook = MyApp.Workbooks.Open(@"WBPATH\WB.exe");
HCSheet = HCBook.Sheets[1];
lastRow = MySheet.Cells.SpecialCells(Excel.XlCellType.xlCellTypeLastCell).Row;
Excel.Range range = HCSheet.Columns["A", Type.Missing];
currentFind = range.Find("Australia",HCSheet.Cells[lastrow, 1]);
With Many thanks to @Hambone i found the solution (more accurately i found 0.1% of the solution. Hambone found the rest);
EHObjApp.Visible = true;
string ColumnHeader = ResourceDetails.ResourceHolder("Root") + ResourceDetails.ResourceHolder("ResourceFolder") + ResourceDetails.ResourceHolder("ColumnHeaders");
HCBook = EHObjApp.Workbooks.Open(ColumnHeader);
HCSheet = HCBook.Worksheets.get_Item(1);
InputBook = EHObjApp.Workbooks.Open(ResourceDetails.ResourceHolder("Root") + @"\Sales\Output\Zoho_Upload\ZOHOSales.xlsx");
InputSheet = InputBook.Worksheets.get_Item(1);
long ExRownumber = HCSheet.Range["A:A"].Find("SalesAustralia").Row + 1;
Range NewColumns = InputSheet.Range["A1:A" + InputSheet.UsedRange.Columns.Count];
This will find the last used column in the row.
You guys have been an amazing help!
Thank you
----------Addition--------------- When finding the smaller column numbers, i.e. rows of 30 or 31 columns etc, this worked fine. I ran into an issue when trying to find the larger numbers, i.e. rows of 140 columns. Changing xlToLeft back to xlUp solved this issue.
Thought i would add this in for anyone that requires this solution in the future.
答案 0 :(得分：3)
我已经看到在VBA中使用这种技术来查找范围中的最后一行，并且它很好地接口到C＃：
class UserPhoneNumberView(FormView):
form_class = UserPhoneNumberForm
template_name = "get_user_phonenumber.html"
def form_valid(self, form):
phonenumber = self.request.POST.get("mobile_number")
unique = self.request.POST.get("unique")
url = "http://example.com/"+unique
response = HttpResponse("", status=302)
body = "See this url: "+url
nonhttp_url = "sms:"+phonenumber+"?body="+body
response['Location'] = nonhttp_url
return response
此时Excel.Range ur = HCSheet.UsedRange;
Excel.Range r = HCSheet.Cells[2, ur.Columns.Count];
r = r.get_End(Excel.XlDirection.xlToLeft);
的值将是第2行中最后一个填充的单元格。要获得除2之外的行，您只需更改r索引器中的第一个参数。
为了证明它有效，你可以这样做：
.Cells要查找最后一个列号，我认为这是您的问题：
r.Value = "Gotcha";
答案 1 :(得分：-1)
Excel自动化是一项雄心勃勃的尝试，只需从任何.NET语言开始。在前面，Web上的许多示例都没有考虑正确释放内存，并且在不需要时将使用对垃圾收集器的调用。在下面的示例代码中，方法UsedRowsColumns不需要对垃圾收集器进行任何调用，因为我遵循了我所谓的two dot rule（其中99.99％的时间释放所有对象，但正如您将看到的并不总是如此）。你会注意到点击该页面上的kevininstructor，因为双点规则将失败，我在更改为kareninstructor时将其更改。
与UsedRowsColumns方法不同，LastColumnForRow（应该回答你的问题）必须做一些额外的工作，因为垃圾收集器需要被调用但不能在同一个方法中调用，所以我设置了一个方法CallGarbageCollector，它在调用之后to LastColumnForRow我调用它来释放Range xlColumns，即使在执行双点规则时它也不会释放。
要测试的表单代码，button1调用以获取第2行的最后一列。
using System;
using System.Windows.Forms;
using System.IO;
namespace UsedRowsCols
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private string fileName = Path.Combine(
AppDomain.CurrentDomain.BaseDirectory, "Demo.xlsx");
private string sheetName = "Sheet1";
/// <summary>
/// Get last row and last column for a worksheet.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button1_Click(object sender, EventArgs e)
{
ExcelUsed eu = new ExcelUsed();
ExcelLast results = eu.UsedRowsColumns(fileName, sheetName);
// send results to Visual Studio Output window
Console.WriteLine($"{results.Row} {results.Column}");
}
/// <summary>
/// Get last used column for a specific row
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
ExcelUsed eu = new ExcelUsed();
try
{
int results = eu.LastColumnForRow(fileName, sheetName,2);
// send results to Visual Studio Output window
Console.WriteLine(results);
}
finally
{
eu.CallGarbageCollector();
}
}
}
}
负责获取上面button1中已使用列的类，并使用上面button2中的行和列。
using System;
using Excel = Microsoft.Office.Interop.Excel;
using System.Runtime.InteropServices;
using System.IO;
namespace UsedRowsCols
{
public class ExcelUsed
{
/// <summary>
/// Get last used column for a row
/// </summary>
/// <param name="fileName"></param>
/// <param name="sheetName"></param>
/// <param name="row"></param>
/// <returns></returns>
public int LastColumnForRow(string fileName, string sheetName, int row)
{
int lastColumn = -1;
if (File.Exists(fileName))
{
Excel.Application xlApp = null;
Excel.Workbooks xlWorkBooks = null;
Excel.Workbook xlWorkBook = null;
Excel.Worksheet xlWorkSheet = null;
Excel.Sheets xlWorkSheets = null;
xlApp = new Excel.Application();
xlApp.DisplayAlerts = false;
xlWorkBooks = xlApp.Workbooks;
xlWorkBook = xlWorkBooks.Open(fileName);
xlApp.Visible = false;
xlWorkSheets = xlWorkBook.Sheets;
for (int x = 1; x <= xlWorkSheets.Count; x++)
{
xlWorkSheet = (Excel.Worksheet)xlWorkSheets[x];
if (xlWorkSheet.Name == sheetName)
{
Excel.Range xlCells = null;
xlCells = xlWorkSheet.Cells;
Excel.Range workRange = xlCells.SpecialCells(Excel.XlCellType.xlCellTypeLastCell);
Excel.Range xlColumns = xlWorkSheet.Columns;
int count = xlColumns.Count;
Marshal.FinalReleaseComObject(xlColumns);
xlColumns = null;
Excel.Range xlLastRange = (Excel.Range)xlWorkSheet.Cells[row, count];
Excel.Range xlDirRange = xlLastRange.End[Excel.XlDirection.xlToLeft];
Marshal.FinalReleaseComObject(xlLastRange);
xlLastRange = null;
lastColumn = xlDirRange.Column;
Marshal.FinalReleaseComObject(xlDirRange);
xlDirRange = null;
Marshal.FinalReleaseComObject(workRange);
workRange = null;
Marshal.FinalReleaseComObject(xlCells);
xlCells = null;
break;
}
Marshal.FinalReleaseComObject(xlWorkSheet);
xlWorkSheet = null;
}
xlWorkBook.Close();
xlApp.UserControl = true;
xlApp.Quit();
Release(xlWorkSheets);
Release(xlWorkSheet);
Release(xlWorkBook);
Release(xlWorkBooks);
Release(xlApp);
return lastColumn;
}
else
{
throw new Exception("'" + fileName + "' not found.");
}
}
/// <summary>
///
/// </summary>
/// <param name="fileName">file to get information form</param>
/// <param name="sheetName">valid sheet name to get last row and column</param>
/// <returns>ExcelLast</returns>
public ExcelLast UsedRowsColumns(string fileName, string sheetName)
{
int RowsUsed = -1;
int ColsUsed = -1;
if (File.Exists(fileName))
{
Excel.Application xlApp = null;
Excel.Workbooks xlWorkBooks = null;
Excel.Workbook xlWorkBook = null;
Excel.Worksheet xlWorkSheet = null;
Excel.Sheets xlWorkSheets = null;
xlApp = new Excel.Application();
xlApp.DisplayAlerts = false;
xlWorkBooks = xlApp.Workbooks;
xlWorkBook = xlWorkBooks.Open(fileName);
xlApp.Visible = false;
xlWorkSheets = xlWorkBook.Sheets;
for (int x = 1; x <= xlWorkSheets.Count; x++)
{
xlWorkSheet = (Excel.Worksheet)xlWorkSheets[x];
if (xlWorkSheet.Name == sheetName)
{
Excel.Range xlCells = null;
xlCells = xlWorkSheet.Cells;
Excel.Range workRange = xlCells.SpecialCells(Excel.XlCellType.xlCellTypeLastCell);
RowsUsed = workRange.Row;
ColsUsed = workRange.Column;
Marshal.FinalReleaseComObject(workRange);
workRange = null;
Marshal.FinalReleaseComObject(xlCells);
xlCells = null;
break;
}
Marshal.FinalReleaseComObject(xlWorkSheet);
xlWorkSheet = null;
}
xlWorkBook.Close();
xlApp.UserControl = true;
xlApp.Quit();
Release(xlWorkSheets);
Release(xlWorkSheet);
Release(xlWorkBook);
Release(xlWorkBooks);
Release(xlApp);
return new ExcelLast() { Row = RowsUsed, Column = ColsUsed };
}
else
{
throw new Exception("'" + fileName + "' not found.");
}
}
public void CallGarbageCollector()
{
GC.Collect();
GC.WaitForPendingFinalizers();
}
private void Release(object sender)
{
try
{
if (sender != null)
{
Marshal.ReleaseComObject(sender);
sender = null;
}
}
catch (Exception)
{
sender = null;
}
}
}
public class ExcelLast
{
/// <summary>
/// Last used row in specific sheet
/// </summary>
public int Row { get; set; }
/// <summary>
/// Last used column in specific sheet
/// </summary>
public int Column { get; set; }
}
}