比较DataView.RowFilter中的日期？

Question

I am scratching my head over something rather stupid yet apparently difficult.

DataView dvFormula = dsFormula.Tables[0].DefaultView;
dvFormula.RowFilter = "'" + startDate.ToString("yyyyMMdd") + "' < EndDate OR EndDate = '19000101'";
dvFormula.Sort = "FromDate ASC";

The result is this:

Cannot perform '<' operation on System.String and System.DateTime.

Please tell me what the best way to solve this problem would be.

Much appreciated!

Answer 1

你需要用＃包装日期，而不是撇号。

dvFormula.RowFilter = "#" + startDate.ToString("MM/dd/yyyy") + "# < EndDate OR EndDate = #1/1/1900#"; 

Answer 2

This is the solution. Try this:

filter = " (Date >= #" +
         Convert.ToDateTime(txtFromDate.Text).ToString("MM/dd/yyyy") +
         "# And Date <= #" +
         Convert.ToDateTime(txtToDate.Text).ToString("MM/dd/yyyy") +
         "# ) ";

Answer 3

Depending on your data provider, you may need to escape dates with the # character rather than the ' character. In addition, I would format your dates in the format YYYY-MM-DD to ensure it can be recognized as a date correctly.