Question

I have a database table with a DATETIME column. What I want to do is to identify whether the date part of a record is the same of with the date part of today. However, I have a datatable object and I cannot use daUsage.Select with the SQL function DATEPART.

So what I’m asking is whether there is a way to filter results from a datatable without using the select function. If this is possible how is it done? I could use LINQ but I’m pretty new to it and I feel that there must be a better way to do that.

Thanks

Answer 1

You could use DataTable.Select to check if your date is between 0 o’clock this day 0 o’clock next day:

string selectString = String.Format("DateColumn >= '{0}' AND DateColumn < '{1}'",
                      DateTime.Today.ToString(DateTimeFormatInfo.InvariantInfo), 
                      DateTime.Today.AddDays(1).ToString(DateTimeFormatInfo.InvariantInfo));
bool hasTodayRecords = dt.Select(selectString).Length > 0;

On this way you get only records of today.

In LINQ you could compare DateTime.Date with DateTime.Today:

bool hasTodayRecords = dt.AsEnumerable().
     Any(r => DateTime.Today.Equals(((DateTime)r["DateColumn"]).Date));