使用 C# 以编程方式获取最后填充的 excel 行

Question

I am trying to get the last row of an excel sheet programatically using the Microsoft.interop.Excel Library and C#. I want to do that, because I am charged with looping through all the records of an excel spreadsheet and performing some kind of operation on them. Specifically, I need the actual number of the last row, as I will throw this number into a function. Anybody have any idea how to do that?

Answer 1

Couple ways,

using Excel = Microsoft.Office.Interop.Excel;

Excel.ApplicationClass excel = new Excel.ApplicationClass();
Excel.Application app = excel.Application;
Excel.Range all = app.get_Range("A1:H10", Type.Missing);

OR

Excel.Range last = sheet.Cells.SpecialCells(Excel.XlCellType.xlCellTypeLastCell, Type.Missing);
Excel.Range range = sheet.get_Range("A1", last);

int lastUsedRow = last.Row;
int lastUsedColumn = last.Column;

Answer 2

This is a common issue in Excel.

Here is some C# code:

// Find the last real row
nInLastRow = oSheet.Cells.Find("*",System.Reflection.Missing.Value, 
System.Reflection.Missing.Value, System.Reflection.Missing.Value,    Excel.XlSearchOrder.xlByRows,Excel.XlSearchDirection.xlPrevious, false,System.Reflection.Missing.Value,System.Reflection.Missing.Value).Row;

// Find the last real column
nInLastCol = oSheet.Cells.Find("*", System.Reflection.Missing.Value,     System.Reflection.Missing.Value,System.Reflection.Missing.Value, Excel.XlSearchOrder.xlByColumns,Excel.XlSearchDirection.xlPrevious,    false,System.Reflection.Missing.Value,System.Reflection.Missing.Value).Column;

found here

or using SpecialCells

Excel.Range last = sheet.Cells.SpecialCells(Excel.XlCellType.xlCellTypeLastCell, Type.Missing);
Excel.Range range = sheet.get_Range("A1", last);

[EDIT] Similar threads:

• VB.NET - Reading ENTIRE content of an excel file
• How to get the range of occupied cells in excel sheet

Answer 3

Pryank's answer is what worked closest for me. I added a little bit towards the end ( .Row ) so I am not just returning a range , but an integer .

int lastRow = wkSheet.Cells.SpecialCells(XlCellType.xlCellTypeLastCell, Type.Missing).Row;

Answer 4

The only way I could get it to work in ALL scenarios (except Protected sheets):

It supports:

• Scanning Hidden Row / Columns

• Ignores formatted cells with no data / formula

Code:

// Unhide All Cells and clear formats
sheet.Columns.ClearFormats();
sheet.Rows.ClearFormats();

// Detect Last used Row - Ignore cells that contains formulas that result in blank values
int lastRowIgnoreFormulas = sheet.Cells.Find(
                "*",
                System.Reflection.Missing.Value,
                InteropExcel.XlFindLookIn.xlValues,
                InteropExcel.XlLookAt.xlWhole,
                InteropExcel.XlSearchOrder.xlByRows,
                InteropExcel.XlSearchDirection.xlPrevious,
                false,
                System.Reflection.Missing.Value,
                System.Reflection.Missing.Value).Row;
// Detect Last Used Column  - Ignore cells that contains formulas that result in blank values
int lastColIgnoreFormulas = sheet.Cells.Find(
                "*",
                System.Reflection.Missing.Value,
                System.Reflection.Missing.Value,
                System.Reflection.Missing.Value,
                InteropExcel.XlSearchOrder.xlByColumns,
                InteropExcel.XlSearchDirection.xlPrevious,
                false,
                System.Reflection.Missing.Value,
                System.Reflection.Missing.Value).Column;

// Detect Last used Row / Column - Including cells that contains formulas that result in blank values
int lastColIncludeFormulas = sheet.UsedRange.Columns.Count;
int lastColIncludeFormulas = sheet.UsedRange.Rows.Count;

Answer 5

For questions involving the Excel object model, it's often easier to try it out in VBA first, then translating to C# is fairly trivial.

In this case one way to do it in VBA is:

Worksheet.UsedRange.Row + Worksheet.UsedRange.Rows.Count - 1

Answer 6

The ActiveSheet.UsedRange.Value returns a 2 dimensional object array of [row, column] . Checking the length of both dimensions will provide the LastRow index and the LastColumn index. The example below is using C#.

Excel.Worksheet activeSheet;
Excel.Range activeRange;

public virtual object[,] RangeArray 
{
    get { return ActiveRange.Value; }
}

public virtual int ColumnCount 
{
    get { return RangeArray.GetLength(1); }
}

public virtual int RowCount
{
    get { return RangeArray.GetLength(0); }
}

public virtual int LastRow 
{
    get { return RowCount; }
}

Answer 7

This issue is even worse when there are possibly empty cells. But you have to read a row even if only one value is filled. It can take a while when there are a lot of unfilled cells but if the input is close to correct it is rather fast.

My solution ignores completely empty rows and returns the longest column's row count:

private static int GetLastRow(Worksheet worksheet)
    {
        int lastUsedRow = 1;
        Range range = worksheet.UsedRange;
        for (int i = 1; i < range.Columns.Count; i++)
        {
            int lastRow = range.Rows.Count;
            for (int j = range.Rows.Count; j > 0; j--)
            {
                if (lastUsedRow < lastRow)
                {
                    lastRow = j;
                    if (!String.IsNullOrWhiteSpace(Convert.ToString((worksheet.Cells[j, i] as Range).Value)))
                    {
                        if (lastUsedRow < lastRow)
                            lastUsedRow = lastRow;
                        if (lastUsedRow == range.Rows.Count)
                            return lastUsedRow - 1;
                        break;
                    }
                }
                else
                    break;
            }
        }
        return lastUsedRow;
    }

Answer 8

For those who use SpecialCells method, (I'm not sure about others), Please Note in case your last cell is merged , you won't be able to get last row and column number using Range.Row and Range.Column to get the last row and column as numbers. you need to first Unmerge your range and then Again get the last cell. It cost me a lot.

private int[] GetLastRowCol(Ex.Worksheet ws)
    {
        Ex.Range last = ws.Cells.SpecialCells(Ex.XlCellType.xlCellTypeLastCell, Type.Missing);
        bool isMerged = (bool)last.MergeCells;
        if (isMerged)
        {
            last.UnMerge();
            last = ws.Cells.SpecialCells(Ex.XlCellType.xlCellTypeLastCell, Type.Missing);
        }
        return new int[2] { last.Row, last.Column };
    }

Answer 9

As previously discussed, the techniques above (xlCellTypeLastCell etc.) do not always provide expected results. Although it's not difficult to iterate down through a column checking for values, sometimes you may find that there are empty cells or rows with data that you want to consider in subsequent rows. When using Excel directly, a good way of finding the last row is to press CTRL + Down Arrow a couple of times (you'll end up at row 1048576 for an XLSX worksheet) and then press CTRL + Up Arrow which will select the last populated cell. If you do this within Excel while recording a Macro you'll get the code to replicate this, and then it's just a case of tweaking it for C# using the Microsoft.Office.Interop.Excel libraries. For example:

    private int GetLastRow()
    {
        Excel.Application ExcelApp;
        ExcelApp = new Excel.Application();

        ExcelApp.Selection.End(Excel.XlDirection.xlDown).Select();
        ExcelApp.Selection.End(Excel.XlDirection.xlDown).Select();
        ExcelApp.Selection.End(Excel.XlDirection.xlDown).Select();

        ExcelApp.Selection.End(Excel.XlDirection.xlUp).Select();

        return ExcelApp.ActiveCell.Row;
    }

It may not be the most elegant solution (I guess instead you could navigate to the final row within the spreadsheet first directly before using XlUp) but it seems to be more reliable.

Answer 10

As CtrlDot and Leo Guardian says, it is not very acuarate the method, there some files where formats affect the "SpecialCells".

So I used a combination of that plus a While.

Range last = sheet.Cells.SpecialCells(XlCellType.xlCellTypeLastCell, Type.Missing);
Range range = sheet.get_Range("A1", last);
int lastrow = last.Row;
// Complement to confirm that the last row is the last
string textCell= "Existe";
while (textCell != null)
{
 lastrow++;
 textCell = sheet.Cells[lastrow + 1, 1].Value;
}
                
                

Answer 11

In case of using OfficeOpenXml nowadays:

using OfficeOpenXml;
using System.IO;

FileInfo excelFile = new FileInfo(filename);
ExcelPackage package = new ExcelPackage(excelFile);
ExcelWorksheet sheet = package.Workbook.Worksheets[1];
int lastRow = sheet.Dimension.End.Row;
int lastColumn = sheet.Dimension.End.Column;

I don't know if using Microsoft.Office.Interop.Excel is still state of the art or more a legacy library. In my opinion I'm doing well replacing with OfficeOpenXml. So this answer might be usefull for future search results.