How to iterate through Excel Worksheets only extracting data from specific columns

问题

How do you iterate through an excel workbook with multiple worksheets only extracting data from say columns "C", "E" & "F"?

Here is the code I have thus far:

public static string ExtractData(string filePath)
    {
        Excel.Application excelApp = new Excel.Application();
        Excel.Workbook workBook = excelApp.Workbooks.Open(filePath);

        string data = string.Empty;

        int i = 0;
        foreach (Excel.Worksheet sheet in workBook.Worksheets)
        {
            data += "*******   Sheet " + i++.ToString() + "   ********\n";

            //foreach (Excel.Range row in sheet.UsedRange.Rows)
            //{
            //    data += row.Range["C"].Value.ToString();
            //}

            foreach (Excel.Range row in sheet.UsedRange.Rows)
            {
                foreach (Excel.Range cell in row.Columns)
                {
                    data += cell.Value + "   ";
                }
                data += "\n";
            }
        }

        excelApp.Quit();

        return data;
    }

Thank you very much for your time, any help is appreciated.

回答1:

Editing your method, here's something should do what you're looking for:

public static string ExtractData(string filePath)
{
    Excel.Application excelApp = new Excel.Application();
    Excel.Workbook workBook = excelApp.Workbooks.Open(filePath);
    int[] Cols = { 3, 5, 6 }; //Columns to loop
                 //C, E, F
    string data = string.Empty;

    int i = 0;
    foreach (Excel.Worksheet sheet in workBook.Worksheets)
    {
        data += "*******   Sheet " + i++.ToString() + "   ********\n";

        foreach (Excel.Range row in sheet.UsedRange.Rows)
        {
            foreach (int c in Cols) //changed here to loop through columns
            {
                data += sheet.Cells[row.Row, c].Value2.ToString() + "   ";
            }
            data += "\n";
        }
    }

    excelApp.Quit();

    return data;
}

I've created a int array to indicate which columns you'd like to read from, and then on each row we just loop through the array.

HTH, Z

回答2:

You could use something like this to get Column C for example:

var numberOfRows = sheet.UsedRange.Columns[3, Type.Missing].Rows.Count;
var values = sheet.Range["C1:C" + numberOfRows].Value2;

numberOfRows holds the number of rows in the worksheet (I think it doesn't skip the blank rows at the top tho, not sure). After that you select a range from C1 to CN and get the Value2 which contains the values. Mind that the values array is actually a two dimensional array. You can now easily do a for loop to get the items:

for (int i = 1; i <= values.Length; i++){
   sb.Append(values[i, 1] + " ");
}

This could be optimized in case columns are next to each other and such, but the above code should get you started.

来源：https://stackoverflow.com/questions/16156951/how-to-iterate-through-excel-worksheets-only-extracting-data-from-specific-colum

标签

excel

.net-4.0

excel-interop