C# 10万空行”-真正的问题是：如何清理工作表，使其UsedRange属性仅包含数据（文本或数字）？这个范围内的行和列可以是空的吗？如果库代码在这个答案中，或者在GitHub或CodeProject中，这将非常方便，因为大多数工作场所不允许从OneDrive或

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10万空行”-真正的问题是：如何清理工作表，使其

UsedRange

属性仅包含数据（文本或数字）？这个范围内的行和列可以是空的吗？如果库代码在这个答案中，或者在GitHub或CodeProject中，这将非常方便，因为大多数工作场所不允许从OneDrive或EtcDid下载。我不知道。我刚刚将我的解决方案推到GitHub。很好的解决方案，很好的代码，没有双点，很好的COM清理。一个建议是扩展方法

ToDataTable

其使用反射的速度很慢，如果您这样使用，您将对性能改进感到惊讶：

Dim data As IEnumerable（Of AccountInfo）=Accounts.GetAccounts（False）using reader=FastMember.ObjectReader.Create（data，properties）dt.Load（reader）结束使用

@JeremyThompson感谢您的评论。关于ToDataTable，我同意。我在很多年前就写了这篇文章，从未更新过。我将在这个周末（当我有时间的时候）更新它。提示：无论您在哪里使用

对象[，]

arrays，以克服互操作和RCW对每个单元格的性能影响。请参阅@Jeremythonpson ClosedXml和OpenXml不使用interopDoh，这是一个#失败，感谢更新。此方法与旧的已接受答案类似，速度也不快。可能尝试添加新工作表并将使用的范围复制粘贴到其中，但我认为它不会更快。谢谢你提供的有用信息。但是在我正在处理的用例中，它不起作用，因为它不是一种格式良好的表格格式，它不适用于额外的空白字段。这只适用于最佳情况

XlWks.Range("...").EntireRow.Delete(xlShiftUp)

with m_XlWrkSheet
lastRow = .UsedRange.Rows.Count
lastCol = .UsedRange.Columns.Count
end with

var wb = new XLWorkbook(@"<path>\test.xlsx", XLEventTracking.Disabled);
var sheet = wb.Worksheet("Sheet1");

for (int i = sheet.LastRowUsed().RowNumber() - 1; i >= 1; i--)
{
    var row = sheet.Row(i);
    if (row.IsEmpty())
    {
        row.Delete();
    }
}

wb.Save();

var wb = new XLWorkbook(@"C:\Users\passp\Documents\test.xlsx");
var sheet = wb.Worksheet("Sheet1");
sheet.Clear();

for (int i = 1; i < 50000; i+=2)
{
    var row = sheet.Row(i);

    for (int j = 1; j < 20; j += 2)
    {
        row.Cell(j).Value = i * j;
    }
}

var wb = new XLWorkbook(@"C:\Users\passp\Documents\test.xlsx", XLEventTracking.Disabled);
var sheet = wb.Worksheet("Sheet1");

var sheet2 = wb.Worksheet("Sheet2");
sheet2.Clear();

sheet.RowsUsed()
    .Where(r => !r.IsEmpty())
    .Select((r, index) => new { Row = r, Index = index + 1} )
    .ForEach(r =>
    {
        var newRow = sheet2.Row(r.Index);

        r.Row.CopyTo(newRow);
    }
);

wb.Save();

Private Sub cmdAddress1_Click(sender As Object, e As EventArgs) Handles cmdAddress1.Click
    Dim ops As New GetExcelColumnLastRowInformation
    Dim info = New UsedInformation
    ExcelInformationData = info.UsedInformation(FileName, ops.GetSheets(FileName))

    Dim SheetName As String = ExcelInformationData.FirstOrDefault.SheetName

    Dim cellAddress = (
        From item In ExcelInformationData
        Where item.SheetName = ExcelInformationData.FirstOrDefault.SheetName
        Select item.LastCell).FirstOrDefault

    MessageBox.Show($"{SheetName} - {cellAddress}")

End Sub

Private Sub cmdAddress_Click(sender As Object, e As EventArgs) Handles cmdAddress.Click
    Dim cellAddress =
        (
            From item In ExcelInformationData
            Where item.SheetName = ListBox1.Text
            Select item.LastCell).FirstOrDefault

    If cellAddress IsNot Nothing Then
        MessageBox.Show($"{ListBox1.Text} {cellAddress}")
    End If

End Sub

public void Yahfoufi(string excelFile)
{
    var exapp = new Microsoft.Office.Interop.Excel.Application {Visible = true};
    var wrb = exapp.Workbooks.Open(excelFile);
    var sh = wrb.Sheets["Sheet1"];
    var lastRow = GetLastIndexOfNonEmptyCell(exapp, sh, XlSearchOrder.xlByRows);
    var lastCol = GetLastIndexOfNonEmptyCell(exapp, sh, XlSearchOrder.xlByColumns);
    var target = sh.Range[sh.Range["A1"], sh.Cells[lastRow, lastCol]];
    Range deleteRows = GetEmptyRows(exapp, target);
    Range deleteColumns = GetEmptyColumns(exapp, target);
    deleteColumns?.Delete();
    deleteRows?.Delete();
}

private static int GetLastIndexOfNonEmptyCell(
    Microsoft.Office.Interop.Excel.Application app,
    Worksheet sheet,
    XlSearchOrder searchOrder)
{
    Range rng = sheet.Cells.Find(
        What: "*",
        After: sheet.Range["A1"],
        LookIn: XlFindLookIn.xlFormulas,
        LookAt: XlLookAt.xlPart,
        SearchOrder: searchOrder,
        SearchDirection: XlSearchDirection.xlPrevious,
        MatchCase: false);
    if (rng == null)
        return 1;
    return searchOrder == XlSearchOrder.xlByRows
        ? rng.Row
        : rng.Column;
}

private static Range GetEmptyRows(
    Microsoft.Office.Interop.Excel.Application app,
    Range target)
{
    Range result = null;
    foreach (Range r in target.Rows)
    {
        if (app.WorksheetFunction.CountA(r.Cells) >= 1)
            continue;
        result = result == null
            ? r.EntireRow
            : app.Union(result, r.EntireRow);
    }
    return result;
}

private static Range GetEmptyColumns(
    Microsoft.Office.Interop.Excel.Application app,
    Range target)
{
    Range result = null;
    foreach (Range c in target.Columns)
    {
        if (app.WorksheetFunction.CountA(c.Cells) >= 1)
            continue;
        result = result == null
            ? c.EntireColumn
            : app.Union(result, c.EntireColumn);
    }
    return result;
}

private static Range GetEntireEmptyRowsOrColumns(
    Microsoft.Office.Interop.Excel.Application app,
    Range target,
    Func<Range, Range> rowsOrColumns,
    Func<Range, Range> entireRowOrColumn)
{
    Range result = null;
    foreach (Range c in rowsOrColumns(target))
    {
        if (app.WorksheetFunction.CountA(c.Cells) >= 1)
            continue;
        result = result == null
            ? entireRowOrColumn(c)
            : app.Union(result, entireRowOrColumn(c));
    }
    return result;
}

Range deleteColumns = GetEntireEmptyRowsOrColumns(exapp, target, (Func<Range, Range>)(r1 => r1.Columns), (Func<Range, Range>)(r2 => r2.EntireColumn));
Range deleteRows = GetEntireEmptyRowsOrColumns(exapp, target, (Func<Range, Range>)(r1 => r1.Rows), (Func<Range, Range>)(r2 => r2.EntireRow));
deleteColumns?.Delete();
deleteRows?.Delete();

public void Yahfoufi(string excelFile)
{
    var exapp = new Microsoft.Office.Interop.Excel.Application {Visible = true};
    var wrb = exapp.Workbooks.Open(excelFile);
    var sh = wrb.Sheets["Sheet1"];
    var lastRow = GetLastIndexOfNonEmptyCell(exapp, sh, XlSearchOrder.xlByRows);
    var lastCol = GetLastIndexOfNonEmptyCell(exapp, sh, XlSearchOrder.xlByColumns);

    // Clear the columns
    sh.Range(sh.Cells(1, lastCol + 1), sh.Cells(1, Columns.Count)).EntireColumn.Clear();

    // Clear the remaining cells
    sh.Range(sh.Cells(lastRow + 1, 1), sh.Cells(Rows.Count, lastCol)).Clear();

}

SELECT * FROM [Sheet1$A1:J16]

List<int> NonEmptyRows = Enumerable.Range(1, rowsToDelete.Max()).ToList().Except(rowsToDelete).ToList();

    private static void DeleteRows(List<int> rowsToDelete, Microsoft.Office.Interop.Excel.Worksheet worksheet)
    {
        // the rows are sorted high to low - so index's wont shift

        List<int> NonEmptyRows = Enumerable.Range(1, rowsToDelete.Max()).ToList().Except(rowsToDelete).ToList();

        if (NonEmptyRows.Max() < rowsToDelete.Max())
        {

            // there are empty rows after the last non empty row

            Microsoft.Office.Interop.Excel.Range cell1 = worksheet.Cells[NonEmptyRows.Max() + 1,1];
            Microsoft.Office.Interop.Excel.Range cell2 = worksheet.Cells[rowsToDelete.Max(), 1];

            //Delete all empty rows after the last used row
            worksheet.Range[cell1, cell2].EntireRow.Delete(Microsoft.Office.Interop.Excel.XlDeleteShiftDirection.xlShiftUp);


        }    //else last non empty row = worksheet.Rows.Count



        foreach (int rowIndex in rowsToDelete.Where(x => x < NonEmptyRows.Max()))
        {
            worksheet.Rows[rowIndex].Delete();
        }
    }

    private static void DeleteCols(List<int> colsToDelete, Microsoft.Office.Interop.Excel.Worksheet worksheet)
    {
        // the cols are sorted high to low - so index's wont shift

        //Get non Empty Cols
        List<int> NonEmptyCols = Enumerable.Range(1, colsToDelete.Max()).ToList().Except(colsToDelete).ToList();

        if (NonEmptyCols.Max() < colsToDelete.Max())
        {

            // there are empty rows after the last non empty row

            Microsoft.Office.Interop.Excel.Range cell1 = worksheet.Cells[1,NonEmptyCols.Max() + 1];
            Microsoft.Office.Interop.Excel.Range cell2 = worksheet.Cells[1,NonEmptyCols.Max()];

            //Delete all empty rows after the last used row
            worksheet.Range[cell1, cell2].EntireColumn.Delete(Microsoft.Office.Interop.Excel.XlDeleteShiftDirection.xlShiftToLeft);


        }            //else last non empty column = worksheet.Columns.Count

        foreach (int colIndex in colsToDelete.Where(x => x < NonEmptyCols.Max()))
        {
            worksheet.Columns[colIndex].Delete();
        }
    }

//code uses variables declared appropriately as Excel.Range & Excel.Worksheet Using Interop library
int x;
int y;
// get the row of the last value content row-wise
oRange = oSheet.Cells.Find(What: "*", 
                           After: oSheet.get_Range("A1"),
                           LookIn: XlFindLookIn.xlValues,
                           LookAt: XlLookAt.xlPart, 
                           SearchDirection: XlSearchDirection.xlPrevious,
                           SearchOrder: XlSearchOrder.xlByRows);

if (oRange == null)
{
    return;
}
x = oRange.Row;

// get the column of the last value content column-wise
oRange = oSheet.Cells.Find(What: "*",
                           After: oSheet.get_Range("A1"),
                           LookIn: XlFindLookIn.xlValues, LookAt: XlLookAt.xlPart,
                           SearchDirection: XlSearchDirection.xlPrevious,
                           SearchOrder: XlSearchOrder.xlByColumns);
y = oRange.Column;

// now we have the corner (x, y), we can delete or clear all content to the right and below
// say J16 is the cell, so x = 16, and j=10

Excel.Range clearRange;

//set clearRange to ("K1:XFD1048576")
clearRange = oSheet.Range[oSheet.Cells[1, y + 1], oSheet.Cells[oSheet.Rows.Count, oSheet.Columns.Count]];
clearRange.Clear(); //clears all content, formulas and formatting
//clearRange.Delete(); if you REALLY want to hard delete the rows

//set clearRange to ("A17:J1048576")            
clearRange = oSheet.Range[oSheet.Cells[x + 1, 1], oSheet.Cells[oSheet.Rows.Count, y]];
clearRange.Clear(); //clears all content, formulas and formatting
//clearRange.Delete();  if you REALLY want to hard delete the columns

lastCell = yourWorkseet.UsedRange.End(xlUp)
firstEmtyRow = lastCell.Offset(RowOffset:=1).EntireRow

        Application excel = new Application();
        Workbook workBook=  excel.Workbooks.Open("file.xlsx")
        Worksheet excelSheet = workBook.ActiveSheet;
        Range excelRange = excelSheet.UsedRange.Columns[1, Missing.Value] as Range;

        var lastNonEmptyRow = excelRange.Cells.Count;