Check if worksheet exist using infragistics

Question

i need to check if a worksheet exist in excel and if not, to create it. I'm using infragistics and the following code gives me the following error:

use of unassigned local variable 'workSheet'.

this is the code:

Workbook workbook = new Workbook();
 Worksheet workSheet;
 foreach (Something result in results)
  {            
     foreach (Something item in result.Something)
     {
         if (!workbook.Worksheets.Exists(item.GetType().Name))
         {
             workSheet = workbook.Worksheets.Add(item.GetType().Name);
         }
         // cell font
        IWorkbookFont oFont = workSheet.Workbook.CreateNewWorkbookFont();
....
    }
}

The error is about the: IWorkbookFont oFont = workSheet.Workbook.CreateNewWorkbookFont()

on the workSheet variable.

thanks.

Answer 1

Here is how you can avoid the error. Initialize worksheet to null when you declare it. Do not forget the null check before accessing the worksheet.

Workbook workbook = new Workbook();
Worksheet workSheet = null;
foreach (Something result in results)
{            
     foreach (Something item in result.Something)
     {
         if (!workbook.Worksheets.Exists(item.GetType().Name))
         {
             workSheet = workbook.Worksheets.Add(item.GetType().Name);
         }

         if (workSheet != null)
         {

             // cell font
             IWorkbookFont oFont = workSheet.Workbook.CreateNewWorkbookFont();
             ....
         }
        ....
     }
}