Question

I can not get the right result from the following code block:

object ob = ds_bug.Tables[0].Compute("Count(id)",str_vertical +"= '"+"' and "+str_horizontal+" = '"+first_row.Cells[j].Text.ToString()+"'");// ds_bug has been filled some data.

str_vertical and str_horizontal are two fields from the ds_bug.Tables[0], and I can see their values are right too when I debug the code.

Is there any problem I set the filter with a string like ” a = ‘##’ and b = ‘##’ ” ?

Answer 1

First you should split the method call and the initialization of the expression and the filter, that makes it clearer:

I assume that first_row.Cells[j].Text.ToString() is a static value that you’ve queried previously, so you can declare it like:

String firstRowCellsJText = first_row.Cells[j].Text.ToString();
String expression="Count(id)";
String filter = "str_vertical=str_horizontal + " + firstRowCellsJText;
object ob = s_bug.Tables[0].Compute(expression,filter);