如何从C＃中获取Excel中特定列中包含数据的所有行

Question

I have a data set in Excel and am using C# to open the worksheet and access some of the data.

I am trying to get all the rows that contain data from a particular column. For example in column B starting from cell 'B3' going down I want to store all the rows that contain data in a collection like an Array.

This is what I have so far:

Application excelApplication;
_Workbook workbook;
_Worksheet sheet;

excelApplication = new Excel.Application
  {
    Visible = true,
    ScreenUpdating = true
  };

workbook = excelApplication.Workbooks.Open(@"C:\Documents and Settings\user\Desktop\Book1.xls");
sheet = (Worksheet)workbook.Worksheets[2];

Excel.Range range = sheet.Range["b3:b145"].

foreach (Range cell in range)
   {

      // Do something with rows which contain data          
   }

As you can see above I have specified the range from B3 to B45 which I don't want. I want to get all the rows in the B column which contain data starting from B3.

How would I achieve this?

Answer 1

In general when I get stuck in these situations I record a Macro and convert the VBA code to C#. The object model in VSTO is pretty much exactly the same (remember this its a great tip) and with .Net 4.0 onwards optional parameters save a lot of code.

In your particular instance I envisage the larger the spreadsheet the longer it will take to read all the Excel cells in column B using VSTO. My advice is to use this technique to read them all at once:

//Work out the number of rows with data in column B:
//int lastColumn = range.Columns.Count;
int lastRow = range.Rows.Count;

//Get all the column values:
object[,] objectArray = shtName.get_Range("B3:B" + lastRow.ToString()).Value2;
rngName.Value2 = objectArray;