Question

我编写了一个代码，将SQL中的数据传递给listview。 [here screenshot of the data pulled and shown on listview. ] 1

如何使用headid在此列表视图上创建组。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Threading;
using System.Diagnostics;
using System.Data.Common;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Timers;
namespace AbhiProject{
public partial class daybook_credit : Form
{
    public daybook_credit()
    {
        InitializeComponent();
        BindGrid();
    }
    //int ID = 0;
    private SqlConnection con;
    private SqlCommand cmd;
    private SqlDataAdapter adapt;
    private DataTable dt;
    //Connection String
    string cs = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Abhilash\Documents\visual studio 2010\Projects\WindowsFormsApplication1\WindowsFormsApplication1\db_all.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
    private void BindGrid()
    {
        listView1.GridLines = true;
        listView1.View = View.Details;

        //Add Column Header

        listView1.Columns.Add("ID", 50);
        listView1.Columns.Add("Head ID", 150);
        listView1.Columns.Add("Date", 150);
        listView1.Columns.Add("Receipt No", 150);
        listView1.Columns.Add("Details", 150);
        listView1.Columns.Add("Cash Credit", 150);
        listView1.Columns.Add("Transfer Credit Adjustment", 150);

        con = new SqlConnection(cs);
        con.Open();


        // Chnage sql query and table name
        cmd = new SqlCommand("Select * from daybook_credit ORDER BY headid ASC", con);
        SqlDataReader Reader = cmd.ExecuteReader();

        listView1.Items.Clear();

        while (Reader.Read())
        {

            listView1.Items.Add(new ListViewItem(new string[] { Reader.GetInt32(0).ToString(), Reader.GetInt32(1).ToString(), Reader.GetString(2), Reader.GetString(3), Reader.GetString(4), Reader.GetInt32(5).ToString(), Reader.GetInt32(6).ToString() }, Reader.GetInt32(1).ToString()));



        }
        //MessageBox.Show(Reader.GetInt32(1).ToString());

        Reader.Close();
        con.Close();
    }

}}

我如何对这些数据进行分组，我也想知道是否可以找到每个组的现金信用额度

Answer 1

实际上你不能直接在gridview上进行分组，

相反，请根据您的要求创建自定义 class ，

public class Sample
{
 public float TransferCredit { get; set; }
 public float CashCredit { get; set; }
 public DateTime Date { get; set; }
 public int HeadID { get; set; }
 public int ID { get; set; }
 public int RecieptNo { get; set; }
}

然后使用相同的并填写列表

List<Sample> result = new List<Sample>();
while (Reader.Read())
  {
   var Sample = new Sample
   {
     TransferCredit = reader.GetInt32(0),
     CashCredit = reader.GetString(1)
      ......
   }
 result.Add(foo);
}

然后您可以使用linq

执行 GroupBy

 result.GroupBy(t => t.HeadID);

结果。

具有sql数据的组列表视图

1 个答案: