在字符串类型的函数参数上使用C＃DataView.RowFilter属性

Question

Is there a way to use the Rowfilter property of DataView on the following string variable?

public DataTable FilterByLatestDate(DataTable tbl, string date_asof)
    {
        DataView latest = tbl.DefaultView;
        //latest.RowFilter = "[date]= '" + date_asof + "'"  ; // 
        //latest.RowFilter = string.Format("[date]= '{0}'", date_asof); // alternative to messing around with quotes

DataTable last_tbl = latest.ToTable();

return last_tbl;
}

Ps: I am only interested in suggestions involving .Rowfilter

Best

Answer 1

When you use a Date in a RowFilter the quoting characted to use is the # symbol

latest.RowFilter = "[date]= #" + date_asof + "#"  ; 

However the RowFilter property accepts a string and thus when you use a Date for the filter the variable should be expressed in format as "MM/dd/yyyy". So if your string date_asof is not in this format then this code could not work correctly.

I suggest you to pass a DateTime to your function and format it with

public DataTable FilterByLatestDate(DataTable tbl, DateTime date_asof)
{
    DataView latest = tbl.DefaultView;
    latest.RowFilter = "[date]= #" + date_asof.ToString("MM/dd/yyyy") + "#";
    return latest.ToTable();
}