在Excel文件中检查空值（空单元格）

Question

I would like to count the number of empty cell in Excel sheet.

I read the double values for all Excel sheet but I can't count the null values since the code below does not work probably.

string path_connection = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + testbox_bath.Text + ";Extended Properties=\"Excel 12.0 Xml;HDR=YES\"";

OleDbConnection connection = new OleDbConnection(path_connection);

OleDbDataAdapter adapter_STDsamverkan = new OleDbDataAdapter("Select [Kvalitetsklass (null)],[Std samverkan (null)]" + "from [Sheet1$]", connection);

DataTable dt_STDsamverkan = new DataTable();

adapter_STDsamverkan.Fill(dt_STDsamverkan);

for (int i = 0; i < dt_STDsamverkan.Rows.Count; i++)
{    
   if (dt_STDsamverkan.Rows[i].Field<double>(1) == null)
   {
        STDsamverkan_count2++;
   }
}

The hint on the IF statement is

the result of the expression is always 'false' since a value of type 'double' is never equal to 'null' of the type 'double?'

What should I do?

Answer 1

I use Double in reading Datatable. The double is nullable.

The answer for this question under the link below:

double and null in c#