我试图通过选择所有单元格从excel表中删除重复项.所以我知道如何处理一个列.但我想用整张纸做.

这就是我尝试过的：

private void RemoveDuplicateRecords()
    {
        try
        { 
            var ar = new int[0];

            foreach (Excel.Worksheet worksheet in bookDest.Worksheets)
            {
                if (worksheet.AutoFilter != null)
                    worksheet.AutoFilterMode = false;  

                int n = worksheet.UsedRange.Columns.Count;
                ar = new int[n];

                for (int i = 0; i < n;)
                {
                    ar[i] = ++i;
                }

                object cols = new object[] { ar }; //isn't working

                Excel.Range range = worksheet.UsedRange;
                range.Select();
                range.Activate();
                range.RemoveDuplicates(cols, Excel.XlYesNoGuess.xlYes);
                //Also tried:
                //range.RemoveDuplicates((object)ar, Excel.XlYesNoGuess.xlYes);  //but no luck
            }
        }
        catch(Exception e)
        {
            MessageBox.Show(e.Message);
        }
    }

我知道如果我有5列,我可以这样做：object cols = new object [] {1,2,3,4,5};

但我不想手动完成.我想动态添加列. Excel文件可以包含任何no.of列.对此有任何帮助表示赞赏.谢谢您的帮助.

最佳答案 我想这应该有效：

    //To remove all the duplicate lines in the result file
    private void RemoveDuplicateRecords()
    {
        try
        {
            foreach (Excel.Worksheet worksheet in bookDest.Worksheets)
            {
                if (worksheet.AutoFilter != null)
                    worksheet.AutoFilterMode = false;

                long n = worksheet.UsedRange.Columns.Count;
                Excel.Range range = worksheet.UsedRange;
                range.Select();
                range.Activate();

                range.RemoveDuplicates(BuildColAry(n), Excel.XlYesNoGuess.xlYes);
            }
        }
        catch(Exception e)
        {
            MessageBox.Show(e.Message);
        }
    }

    dynamic BuildColAry(long n)
    {
        dynamic vMyArray = new dynamic[n];
        int idx;

        for (idx = 1; idx <= n; idx++)
        {
            vMyArray[idx - 1] = idx;
        }
        return vMyArray;
    }