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c#excelformatalignment

Cell Style Alignment on a Range

I'm having a problem formatting cells in an Excel sheet. For some reason my code seems to be changing the style of all cells when I just want to change the style of a few specified, or a specified range.

Here's some of the code that I am using:

app = new Microsoft.Office.Interop.Excel.Application();
workbook = app.Workbooks.Add(1);
worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Sheets[1];

//Change all cells' alignment to center
worksheet.Cells.Style.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;

//But then this line changes every cell style back to left alignment
worksheet.Cells[y + 1, x + 2].Style.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignLeft;

Why would it change the style of multiple cells when I set it to just work on one? Is it not supposed to work how I want it to? Is there another way of doing this?

Solution

  • Based on this comment from the OP, "I found the problem. apparentlyworksheet.Cells[y + 1, x + 1].HorizontalAlignment", I believe the real explanation is that all the cells start off sharing the same Style object. So if you change that style object, it changes all the cells that use it. But if you just change the cell's alignment property directly, only that cell is affected.