Detect blank Excel cell using interop.excel in C#

Question

I'm trying to parse text from an Excel doc in C#. The problem is that I can't find a way to detect (and ignore) blank cells.

I'm using Microsoft.Office.Interop.Excel in Visual Studio 2010 C#. I can't skip blank cells so my program will consequentially store blank values.

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I have defined my woorksheet the following way:

Excel.Application exApp = OpenExcel(); String mySheet = @"C:\\sheet.xlsx"; Excel.Workbook wb = exApp.Workbooks.Open(mySheet); Excel.Worksheet ws = wb.Sheets[1];

I access my cells by ws.Cells[row, col] . And I've tried different approaches. To name a few:

ws.Cells[row, col].Value2 == null
ws.Cells[row, col].Value == null
ws.Cells[row, col].Value == ""

And also using the Range object explicitely Excel.Range rng = ws.Cells[row, col] To use rng.Value2

Depending on which approach I use I get different errors, Exception from HRESULT: 0x800A03EC is one of them.

Answer 1

You should probably use SpecialCells. Eg the code below sets the value of all empty cells to zero (vba code).

Range("e11:g16").SpecialCells(xlCellTypeBlanks).Value = 0

Or you can easily loop all empty cells like this:

For Each item In Range("e11:g16").SpecialCells(xlCellTypeBlanks)
   '...
Next

In the same logic, if you want to loop through all cells which are not empty:

 For Each item In Range("g10:h11").SpecialCells(xlCellTypeConstants)
        '...
 Next

Answer 2

尝试使用 Range 对象的 Text 属性...

rng.Text == String.Empty

Answer 3

Try this:

if (ws.IsEmpty(Cells[row, col]))

I don't exactly remember if I got the syntax right for porting to Excel from .NET, but this is the command I use in a VB macro from within Excel.

you can also try IsNumeric(Cells[row,col].Value)

The default value for Excel cells is Empty (but I can't find the MSN link to verify this!)

See: What is the difference between =Empty and IsEmpty() in VBA (Excel)?