Get records for yesterday from list c#

Question

I set up a list with 7 columns and Thousands of rows. I also have a data table with the same data (yes, redundant). What I am trying to do is get all the records related to yesterdays date.

I've started a few queries on the data table with no success. It keeps on coming up empty. Same with the list.

Below is all my code for the table/list.

     DataTable dtTesting = new DataTable();
            List<string>[] listA = new List<string> [8];
            listA[0] = new List<string>();
            listA[1] = new List<string>();
            listA[2] = new List<string>();
            listA[3] = new List<string>();
            listA[4] = new List<string>();
            listA[5] = new List<string>();
            listA[6] = new List<string>();
            listA[7] = new List<string>();

            dtTesting.Columns.Add("Over2Minutes", typeof(string));
            dtTesting.Columns.Add("AgentName", typeof(string));
            dtTesting.Columns.Add("PhoneNumber", typeof(string));
            dtTesting.Columns.Add("DateTime", typeof(DateTime ));
            dtTesting.Columns.Add("Direction", typeof(string));
            dtTesting.Columns.Add("CallTo", typeof(string));
            dtTesting.Columns.Add("ManagerName", typeof(string));
            dtTesting.Columns.Add("Duration", typeof(string));

            // List<string> listE = new List<string>();
            //List<string> listF = new List<string>();

            while (!reader.EndOfStream)
            {
                var line = reader.ReadLine();
                var values = line.Split(',');

                DataRow data = dtTesting.NewRow();
                data["Over2Minutes"] = values[0];
                data["AgentName"] = values[1];
                data["PhoneNumber"] = values[2];
                data["DateTime"] = values[3];
                data["Direction"] = values[4];
                data["CallTo"] = values[5];
                data["ManagerName"] = values[6];
                data["Duration"] = values[7];

                listA[0].Add(values[0]);
                listA[1].Add(values[1]);
                listA[2].Add(values[2]);
                listA[3].Add(values[3]);
                listA[4].Add(values[4]);
                listA[5].Add(values[5]);
                listA[6].Add(values[6]);
                listA[7].Add(values[7]);


            } 
            //start of filters

            DataTable filtered = new DataTable();
            DateTime yesterday = DateTime.Today.AddDays(-1);
            DateTime today = DateTime.Today.AddDays(1);

            //List<string> listBD = new List<string>();
           // listBD.AddRange(listB);
         //   listBD.AddRange(listD);
           // 


            if (cbDayList.SelectedIndex == 0)
            {
                try
                {
                  var FilteredData =   

                }
                catch
                {
                    MessageBox.Show("No Data To Show");
                }
            }

Answer 1

If you want to filter the DataTable rows according to a particular data you use the Select method of the DataTable. But, being the FilterExpression of the Select method a string, you are forced to convert the DateTime variables to a string. And this is where the problem begin.

You cannot use the default conversion of a DateTime to a string because in case of DateTime the FilterExpression requires the date to be expressed according to the InvariantCulture format. "M/d/yyyy"

 var FilteredData = dtSettings.Select("DateTime >= #" + 
                                      yesterday.ToString("M/d/yyyy") + 
                                      "# AND date <= #" + 
                                      today.ToString("M/d/yyyy") + "#"); 

By the way, albeit improbable this query gets also the records stored exactly at midnight. Probably you need < today.ToString("M/d/yyyy")

Another way to reach your goal is through the IEnumerable extension Where (Linq namespace)

 var  FilteredData = dtSettings.AsEnumerable()
              .Where(x => x.Field<DateTime>("DateTime") >= yesterday &&
                          x.Field<DateTime>("DateTime") < today);