C# Excel 파일 병합

// workbook 
Workbook newbook = new Workbook();
newbook.Version = ExcelVersion.Version2013;

// （ 3 ）
newbook.Worksheets.Clear();

// workbook， Excel 
Workbook tempbook = new Workbook();

// Excel 
string[] excelFiles = new string[] { "1.xlsx", "2.xlsx"};

// 
for (int i = 0; i < excelFiles.Length; i++)
{
    // Excel 
    tempbook.LoadFromFile(excelFiles[i]);

    // AddCopy ， workbook
    foreach (Worksheet sheet in tempbook.Worksheets)
    {
        newbook.Worksheets.AddCopy(sheet);
    }
}

// 
newbook.SaveToFile("MergeFiles.xlsx", ExcelVersion.Version2013);

string[] excelFiles = new string[] { "1.xlsx", "2.xlsx", "3.xlsx" };

Workbook workbook1 = new Workbook();
// Excel 
workbook1.LoadFromFile(excelFiles[0]);

// Excel 
Workbook workbook2 = new Workbook();
workbook2.LoadFromFile(excelFiles[1]);

// Excel 
Workbook workbook3 = new Workbook();
workbook3.LoadFromFile(excelFiles[2]);

// 
Worksheet sheet1 = workbook1.Worksheets[0];

// Excel datatable 
Worksheet sheet2 = workbook2.Worksheets[0];
DataTable dataTable1 = sheet2.ExportDataTable();

Worksheet sheet3 = workbook3.Worksheets[0];
DataTable dataTable2 = sheet3.ExportDataTable();

sheet1.InsertDataTable(dataTable1, true, sheet1.LastRow + 1, 1);
sheet1.InsertDataTable(dataTable2, true, sheet1.LastRow + 1, 1);

// 
workbook1.SaveToFile("Merged.xlsx", ExcelVersion.Version2013);