新しい行の挿入

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    public static string ShiftedRangeOnInsertRow(string range, uint row_number_at, uint new_row_count) {
        Regex regex = new Regex(@"\$?[A-Za-z]+\$?[1-9][0-9]*", RegexOptions.IgnoreCase);//セル番地にマッチ
        string range_shifted = range;
        MatchCollection mc = regex.Matches(range);
        for (int i = mc.Count - 1; i >= 0; i--) {
            string range_element_address = mc[i].ToString();
            if (GetRowIndex(range_element_address) >= row_number_at) {
                range_shifted = range_shifted.Replace(range_element_address, getOffsetAddress(range_element_address, (int)new_row_count, 0));
            }
        }
        return range_shifted;
    }

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;
namespace OpenXMLSDK_Sample12{
    class Program {
        static void Main(string[] args) {
            const string FILE = @"C:\Users\Public\Documents\openxmlsdk19.xlsx";
            const string SHEET_NAME = "Sheet1";

            using (SpreadsheetDocument excelDoc = SpreadsheetDocument.Open(FILE, true)) {
                WorkbookPart bookPart = excelDoc.WorkbookPart;
                int sheet_index = GetWorksheetIndex(bookPart, SHEET_NAME);
                WorksheetPart sheet_part = GetWorksheetPart(bookPart, sheet_index);

                InsertRows(sheet_part, 3, 1);
                InsertRows(sheet_part, 5, 2);
                InsertRows(sheet_part, 8, 3);

            }
            //ファイルを開く
            System.Diagnostics.Process.Start(FILE);
        }
        
        public static void InsertRows(WorksheetPart ws_part, uint row_number_at, uint new_row_count = 1) {
            if (row_number_at == 0) {
                throw new Exception("row_number_at must be positive");
            }
            if (new_row_count <= 0) {
                throw new Exception("new_row_count must be positive");
            }

            SheetData sheet_data_part = ws_part.Worksheet.GetFirstChild<SheetData>();
            Regex regex = new Regex(@"\$?[A-Za-z]+\$?[1-9][0-9]*", RegexOptions.IgnoreCase);//セル番地にマッチ

            /*** dimension  ***/
            SheetDimension dimension_modified = ws_part.Worksheet.GetFirstChild<SheetDimension>();
            if (isRangeAddress(dimension_modified.Reference)) {
                string last_cell_address = dimension_modified.Reference.Value.Split(':')[1];
                if (row_number_at <= GetRowIndex(last_cell_address)) {
                    dimension_modified.Reference = new StringValue(ShiftedRangeOnInsertRow(dimension_modified.Reference, row_number_at, new_row_count));
                } else {
                    return;
                }
            } else {
                return;
            }
            
            /*** Cell Merge ***/
            MergeCells mergeCells = ws_part.Worksheet.GetFirstChild<MergeCells>();
            if (mergeCells != null) {
                foreach (MergeCell merge_cell in mergeCells) {
                    merge_cell.Reference = ShiftedRangeOnInsertRow(merge_cell.Reference, row_number_at, new_row_count);
                }
            }

            /*** Shift Row and Cell Reference ***/
            foreach (var row in sheet_data_part.Elements<Row>().Where(r => r.RowIndex >= row_number_at)) {
                row.RowIndex+= new_row_count;
                foreach (var cell in row.Elements<Cell>()) {
                    cell.CellReference = $"{GetColumnName(cell.CellReference)}{row.RowIndex}";
                }
            }

            /*** Shift Formula Reference ***/
            foreach (var cell in sheet_data_part.Descendants<Cell>().Where(c => c.CellFormula != null)) {
                /*** Shift Formula ***/
                string formula = cell.CellFormula.Text;
                if (!string.IsNullOrEmpty(formula)) {
                    cell.CellFormula.Text = ShiftedRangeOnInsertRow(formula, row_number_at, new_row_count);
                }

                /*** Shift Formula Reference Attribute ***/
                string reference = cell.CellFormula.Reference;
                if (!string.IsNullOrEmpty(reference)) {
                    cell.CellFormula.Reference = ShiftedRangeOnInsertRow(cell.CellFormula.Reference, row_number_at, new_row_count);
                }
            }

            /*** CalcChain ***/
            WorkbookPart wb_part = ws_part.GetParentParts().ElementAt(0) as WorkbookPart;
            Sheets sheets = wb_part.RootElement.Elements<Sheets>().First();
            string sheet_part_id = wb_part.GetIdOfPart(ws_part);
            string sheet_id = (sheets.First(sh => (sh as Sheet).Id == sheet_part_id) as Sheet).SheetId;
            CalculationChainPart calc_chain_part = wb_part.GetPartsOfType<CalculationChainPart>().FirstOrDefault();
            if (calc_chain_part != null) {
                foreach (CalculationCell cell in calc_chain_part.CalculationChain.Elements<CalculationCell>().Where(c => c.SheetId == sheet_id)) {
                    cell.CellReference = ShiftedRangeOnInsertRow(cell.CellReference, row_number_at, new_row_count);
                }
            }

            /*** name definition ***/
            /*** graph ***/
            /*** pivot table & graph ***/

            /*** Add new Cell and Copy cell style from the previous row ***/
            var row_previous = sheet_data_part.Elements<Row>().FirstOrDefault(r => r.RowIndex == row_number_at - 1);
            SheetDimension dimension = ws_part.Worksheet.GetFirstChild<SheetDimension>();
            uint[] col_range;
            if (row_previous == null) {
                col_range = dimension.Reference.Value.Split(':').Select(s => GetColumnIndex(s)).ToArray();
            } else {
                col_range = row_previous.Spans.InnerText.Split(':').Select(s => Convert.ToUInt32(s)).ToArray();
            }

            for (uint i = 0; i < new_row_count; i++) {
                var row_new = new Row();
                if (row_previous != null) {
                    foreach (var attr in row_previous.GetAttributes()) {
                        row_new.SetAttribute(new OpenXmlAttribute() { LocalName = attr.LocalName, NamespaceUri = attr.NamespaceUri, Prefix = attr.Prefix, Value = attr.Value });
                    }
                }
                row_new.RowIndex = row_number_at + i;

                for (uint j = col_range[0]; j <= col_range[1]; j++) {
                    Cell new_cell = new Cell() { CellReference = $"{GetColumnName(j)}{row_new.RowIndex}" };
                    if (row_previous != null) {
                        Cell previous_cell = GetCell(ws_part, $"{GetColumnName(j)}{row_number_at - 1}");
                        new_cell.StyleIndex = previous_cell.StyleIndex;
                    }
                    row_new.Append(new_cell);
                }
                sheet_data_part.InsertAt<Row>(row_new, (int)row_new.RowIndex.Value - 1);
            }
        }
        
        public static string ShiftedRangeOnInsertRow(string range, uint row_number_at, uint new_row_count) {
            Regex regex = new Regex(@"\$?[A-Za-z]+\$?[1-9][0-9]*", RegexOptions.IgnoreCase);//セル番地にマッチ
            string range_shifted = range;
            MatchCollection mc = regex.Matches(range);
            for (int i = mc.Count - 1; i >= 0; i--) {
                string range_element_address = mc[i].ToString();
                if (GetRowIndex(range_element_address) >= row_number_at) {
                    range_shifted = range_shifted.Replace(range_element_address, getOffsetAddress(range_element_address, (int)new_row_count, 0));
                }
            }
            return range_shifted;
        }
        
        public static string getOffsetAddress(string source_cell_address, int biasRow, int biasColumn) {
            if (string.IsNullOrEmpty(source_cell_address) || !isOneCellAddress(source_cell_address)) {
                return string.Empty;
            }

            long offset_address_row = GetRowIndex(source_cell_address) + biasRow;
            if (offset_address_row < 1) {
                offset_address_row = 1;
            }
            if (offset_address_row > MAX_ROW_INDEX) {
                offset_address_row = MAX_ROW_INDEX;
            }

            long offset_address_col = GetColumnIndex(source_cell_address) + biasColumn;
            if (offset_address_col < 1) {
                offset_address_col = 1;
            }
            if (offset_address_col > MAX_COL_INDEX) {
                offset_address_col = MAX_COL_INDEX;
            }

            //absolute address
            string col_name = GetColumnName((uint)offset_address_col);
            if (source_cell_address.StartsWith("$")) {
                col_name = $"${col_name}";
            }

            string row_number = offset_address_row.ToString();
            if (source_cell_address.LastIndexOf('$') > 0) {
                row_number = $"${row_number}";
            }

            //return GetColumnName((uint)offset_address_col) + offset_address_row;
            return $"{col_name}{row_number}";
        }
        //以下省略
    }
}

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/*** Shift Row and Cell Reference ***/
foreach (var row in sheet_data_part.Elements>Row<().Where(r => r.RowIndex >= row_number_at)) {
    row.RowIndex+= new_row_count;
    foreach (var cell in row.Elements>Cell<()) {
        cell.CellReference = $"{GetColumnName(cell.CellReference)}{row.RowIndex}";
    }
}

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/*** Add new Cell and Copy cell style from the previous row ***/
var row_previous = sheet_data_part.Elements>Row<().FirstOrDefault(r => r.RowIndex == row_number_at - 1);
SheetDimension dimension = ws_part.Worksheet.GetFirstChild>SheetDimension<();
uint[] col_range;
if (row_previous == null) {
    col_range = dimension.Reference.Value.Split(':').Select(s => GetColumnIndex(s)).ToArray();
} else {
    col_range = row_previous.Spans.InnerText.Split(':').Select(s => Convert.ToUInt32(s)).ToArray();
}
 
for (uint i = 0; i < new_row_count; i++) {
    var row_new = new Row();
    if (row_previous != null) {
        foreach (var attr in row_previous.GetAttributes()) {
            row_new.SetAttribute(new OpenXmlAttribute() { LocalName = attr.LocalName, NamespaceUri = attr.NamespaceUri, Prefix = attr.Prefix, Value = attr.Value });
        }
    }
    row_new.RowIndex = row_number_at + i;
 
    for (uint j = col_range[0]; j <= col_range[1]; j++) {
        Cell new_cell = new Cell() { CellReference = $"{GetColumnName(j)}{row_new.RowIndex}" };
        if (row_previous != null) {
            Cell previous_cell = GetCell(ws_part, $"{GetColumnName(j)}{row_number_at - 1}");
            new_cell.StyleIndex = previous_cell.StyleIndex;
        }
        row_new.Append(new_cell);
    }
    sheet_data_part.InsertAt<Row>(row_new, (int)row_new.RowIndex.Value - 1);
}