试图从一个数据表中检索数据，我试图根据某些条件使用 C# 填充另一个数据表，但我无法这样做

Question

我正在使用下面的代码。

我在 dta 中得到数据 table 数据正常。

现在，在 GCSdt1 中，我想要填充数据，以便为每位员工显示该月的列中的用户班次。我的意思是 table 应该看起来像

Name | 6-1-2015|6-2-2015|.........|6-30-2015 下一行应该在名字下面它应该显示名字，在 6-1-2015 下它应该显示他在 6-1-2015

的班次

下面是我的代码。我能够填充第一个数据 table 并为网格创建列。现在我卡住了。

    SqlDataReader GCSrdr;
    SqlCommand GCScmd;
    DataRow GCSdrow;
    DataView GTView;
    DataTable GCSdt = new DataTable();
    DataTable GCSdt1 = new DataTable();
    SqlConnection GCScon = new SqlConnection("MYCOnnection");
    DateTime dt = DateTime.Today.Date;
    static DateTime today = DateTime.Today;

    DataColumn[] day1;



    static int daysInMonth = DateTime.DaysInMonth(today.Year, today.Month);

    DateTime startOfMonth = new DateTime(today.Year, today.Month, 1);
    DateTime endOfMonth = new DateTime(today.Year, today.Month, daysInMonth);

    public DataTable MonthView()
    {

        string gcsCmdSelect = "Select S.Emp_Name,S.User_Shift,S.Shift_Emp_Status,S.Shift_Date from Shift_Details S INNER JOIN Emp_Details E ON S.EMP_Name=E.Employee_Name where (S.Shift_Date >='" + startOfMonth + "') and (S.Shift_Date <='" + endOfMonth + "')  ORDER BY S.Emp_Name";

        if (GCScon.State == ConnectionState.Closed)
        {
            GCScon.Open();
        }
        SqlDataAdapter da = new SqlDataAdapter(gcsCmdSelect, GCScon);
        DataTable dta = new DataTable();
        da.Fill(dta);
       /////// Results fine


        DataView ndtv = new DataView(dta);
        GCSdt = ndtv.ToTable(true,dta.Columns[0].ToString());


        GCSdt1.Columns.Add("Name");
        for (int i = 1; i <=daysInMonth; i++)
        {

            GCSdt1.Columns.Add(startOfMonth.ToShortDateString());
            startOfMonth = startOfMonth.AddDays(1);
        }

          GCSdt1.Rows.Add();

////////////////////卡在此处/////////////////////

        return GCSdt1;


    }
}

Answer 1

试试下面的代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            DataTable dta = new DataTable();
            dta.Columns.Add("Emp_Name", typeof(string));

            dta.Columns.Add("User_Shift", typeof(string));
            dta.Columns.Add("Shift_Emp_Status", typeof(string));
            dta.Columns.Add("Shift_Date", typeof(DateTime));
            dta.Columns["Shift_Date"].AllowDBNull = true;

            dta.Rows.Add(new object[] { "John", "Morning", "abc", DateTime.Parse("1/1/15") });
            dta.Rows.Add(new object[] { "John", "Morning", "abc", DateTime.Parse("1/2/15") });
            dta.Rows.Add(new object[] { "John", "Afternoon", "abc", DateTime.Parse("1/3/15") });
            dta.Rows.Add(new object[] { "John", "Morning", "abc", DateTime.Parse("1/14/15") });
            dta.Rows.Add(new object[] { "John", "Morning", "abc", DateTime.Parse("1/15/15") });
            dta.Rows.Add(new object[] { "John", "Afternoon", "abc", DateTime.Parse("1/26/15") });
            dta.Rows.Add(new object[] { "Mary", "Morning", "abc", DateTime.Parse("1/15/15") });
            dta.Rows.Add(new object[] { "Mary", "Morning", "abc", DateTime.Parse("1/22/15") });
            dta.Rows.Add(new object[] { "Mary", "Evening", "abc", DateTime.Parse("1/23/15") });
            dta.Rows.Add(new object[] { "Mary", "Afternoon", "abc", DateTime.Parse("1/24/15") });
            dta.Rows.Add(new object[] { "Mary", "Morning", "abc", null });
            dta.Rows.Add(new object[] { "Mary", "Evening", "abc", DateTime.Parse("1/26/15") });

            DataTable displayTable = new DataTable();
            DateTime firstDayOfMonth = DateTime.Parse("1/1/15");
            int numberOfDaysInMonth = firstDayOfMonth.AddMonths(1).AddDays(-1).Day;
            DateTime dayCounter = firstDayOfMonth;

            displayTable.Columns.Add("Name", typeof(string));
            for (int i = 0; i < numberOfDaysInMonth; i++)
            {
                displayTable.Columns.Add(dayCounter.ToShortDateString(), typeof(string));
                dayCounter = dayCounter.AddDays(1);
            }


            var results = dta.AsEnumerable()
                .GroupBy(x => x.Field<string>("Emp_Name"))
                .Select(x => new
                {
                    name = x.Select(y => y.Field<string>("Emp_Name")).FirstOrDefault(),
                    shifts = x.Select(y => y.Field<string>("User_Shift")).ToList(),
                    days = x.Select(y => y.Field<object>("Shift_Date")).ToList()
                }).ToList();

            foreach (var row in results)
            {
                string[] shifts = new string[numberOfDaysInMonth + 1];
                shifts[0] = row.name;
                for (int i = 0; i < row.days.Count; i++)
                {
                    if (row.days[i] != null)
                    {
                        int dayOfMonth = ((DateTime)(row.days[i])).Day;
                        string shift = row.shifts[i];
                        shifts[dayOfMonth] = shift;
                    }

                }

                DataRow shiftRow = displayTable.Rows.Add(shifts);
            }

            dataGridView1.DataSource = displayTable;
        }
    }
}

试图从一个数据表中检索数据，我试图根据某些条件使用 C# 填充另一个数据表，但我无法这样做

trying to retrieve data from one datatable and i am trying to populate another datatable based on certain conditions using C# i am unable to do so

c#

datatable