在 C# 中从不同的 Excel 工作表复制数据

Question

I am using a Windows Desktop App and I wish to open a new Excel workbook and worksheet and then have the user select an existing Excel file so that the program can copy data onto the new sheet. The user should do this twice, since two Excel files are used for reference.

I know that to get the new Excel workbook and worksheet, you'd do the following:

Excel.Application oXL;
Excel._Workbook oWB;
Excel._Worksheet oSheet;
Excel.Range oRng;

oXL = new Excel.Application();
oXL.Visible = true;

//Get a new workbook.
oWB = (Excel._Workbook)(oXL.Workbooks.Add(Missing.Value));
oSheet = (Excel._Worksheet)oWB.ActiveSheet;
string sheetName = comboBox1.Text;
oSheet.Name = sheetName;

But where I get lost is how to reference the file that the user selects... Would you do...

string excelPath = string.Empty;
using (OpenFileDialog excelFile = new OpenFileDialog())
{
    excelFile.InitialDirectory = "c:\\";
    if(excelFile.ShowDialog() == DialogResult.OK)
    {

    }
}

After that how do I reference the data in the selected Excel file to, for example, extract everything from Column A and copy it into the new Excel file?

Answer 1

Here's a little function I used in the past to do this through the interop's clipboard functionality:

using Microsoft.Office.Interop.Excel;

public bool XlsCopyPaste(ref Workbook srcWb,
                         string srcSheetName, string srcRange,
                         ref Workbook tgtWb,
                         string tgtSheetName, string tgtRange,
                         XlPasteType pasteType)
{
    try
    {   
        var srcWs = srcWb.Sheets.Cast<Worksheet>().ToList();
        var tgtWs = tgtWb.Sheets.Cast<Worksheet>().ToList();

        var srcSheet = srcWs.FirstOrDefault(s => s.Name == srcSheetName);
        if (srcSheet != null)
        {
            var tgtSheet = tgtWs.FirstOrDefault(s => s.Name == tgtSheetName);
            if (tgtSheet == null)
            {
                tgtSheet = tgtWb.Sheets.Add();
                tgtSheet.Name = tgtSheetName;
            }

            var source = srcSheet.Range(srcRange);
            var target = tgtSheet.Range(tgtRange);

            source.Copy();
            target.PasteSpecial(pasteType, XlPasteSpecialOperation.xlPasteSpecialOperationNone, false, false);
        }
    }
    catch (Runtime.InteropServices.COMException ex)
    {
        return false;
    }
}

And you can call it like this:

var xl = new Application();
var srcWb = (Workbook)xl.Workbooks.Open(xl.GetOpenFilename("Excel Workbooks (*.xls; *.xlsx),*.xls;*.xlsx").ToString());
var tgtWb = (Workbook)xl.Workbooks.Open(xl.GetOpenFilename("Excel Workbooks (*.xls; *.xlsx),*.xls;*.xlsx").ToString());

if (XlsCopyPaste(srcWb, "Sheet1", "B:C", tgtWb, "Sheet2", "A1", XlPasteType.xlPasteAll))
{
    tgtWb.Save();
}

srcWb.Close();
tgtWb.Close();

xl.Quit();