Question

I can’t change column format in an existing Excel document (xlsx). Columns content are numbers actually but shown as text and therefore green triangle appear telling that cells shown as text.

So I open this document in C# app and do the following thing:

sheet_.Range[sheet_.Cells[1, 2], sheet_.Cells[rowNum, 2]].EntireColumn.NumberFormat = "0";                

But it doesn’t change column to appear content as numbers (they remain aligned by left side)

Answer 1

I didn’t find ideal solution to this issue and ended with the following:

    sheet_.get_Range("A1", "A100").NumberFormat = "0";

    for(int i = 1; i <= 100; i++)
    {
       sheet_.Cells[1, i].Value = sheet_.Cells[1, i].Value;
    }