ボタンとデータグリッドビューを備えたwinformがあります。
シナリオは次のとおりです。
私はwinformを持っています:
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();
CreateItems();
}
private List<Store> stores = new List<Store>();
public void CreateItems()
{
Store newStore1 = new Store();
newStore1.StoreName = "My Store 1";
newStore1.City = "My City 1";
newStore1.PlannedSales = 10;
newStore1.RealizedSales = 5;
newStore1.SalesDate = new DateTime(2012, 01, 12, 12, 30, 54, DateTimeKind.Unspecified);
Store newStore2 = new Store();
newStore2.StoreName = "My Store 2";
newStore2.City = "My City 2";
newStore2.PlannedSales = 200000;
newStore2.RealizedSales = 250000;
newStore2.SalesDate = new DateTime(2012, 04, 12, 12, 30, 54, DateTimeKind.Unspecified);
Store newStore3 = new Store();
newStore3.StoreName = "My Store 3";
newStore3.City = "My City 3";
newStore3.PlannedSales = 100000;
newStore3.RealizedSales = 10000;
newStore3.SalesDate = new DateTime(2012, 05, 12, 12, 30, 54, DateTimeKind.Unspecified);
Store newStore4 = new Store();
newStore4.StoreName = "My Store 1";
newStore4.City = "My City 1";
newStore4.PlannedSales = 20;
newStore4.RealizedSales = 10;
newStore4.SalesDate = new DateTime(2012, 02, 12, 12, 30, 54, DateTimeKind.Unspecified);
Store newStore5 = new Store();
newStore5.StoreName = "My Store 1";
newStore5.City = "My City 1";
newStore5.PlannedSales = 30;
newStore5.RealizedSales = 20;
newStore5.SalesDate = new DateTime(2012, 03, 12, 12, 30, 54, DateTimeKind.Unspecified);
stores.Add(newStore1);
stores.Add(newStore2);
stores.Add(newStore3);
stores.Add(newStore4);
stores.Add(newStore5);
}
private void btnQuery_Click(object sender, EventArgs e)
{
var query1 = stores.GroupBy(x => new
{
x.City,
x.StoreName,
x.SalesDate.Year,
x.SalesDate.Month
}).Select(group => new
{
Planned = group.Sum(x => x.PlannedSales),
Realised = group.Sum(x => x.RealizedSales),
Count = group.Count(),
City = group.Key.City,
StoreName = group.Key.StoreName,
Year = group.Key.Year,
Month = group.Key.Month
}).OrderBy(x => x.Year).ThenBy(x => x.Month).Where(x => x.StoreName.Equals("My Store 1"));
List<Store> total = new List<Store>();
foreach (var value in query1)
{
Store newStore = new Store()
{
MonthYear = value.Month.ToString() + " - " + value.Year.ToString(),
RealizedSales = value.Realised,
PlannedSales = value.Planned
};
total.Add(newStore);
};
var query2 = total.Select((s, i) => new
{
MonthYear = s.MonthYear,
RealizedSales = s.RealizedSales + total.Take(i).Sum(sa => sa.RealizedSales),
PlannedSales = s.PlannedSales + total.Take(i).Sum(sa => sa.PlannedSales)
});
List<Store> totalFinal = new List<Store>();
foreach (var value in query2)
{
Store newStore = new Store()
{
MonthYear = value.MonthYear,
RealizedSales = value.RealizedSales,
PlannedSales = value.PlannedSales
};
totalFinal.Add(newStore);
};
dataGridView1.DataSource = totalFinal;
}
}
public class Store
{
public string StoreName { get; set; }
public string City { get; set; }
public int PlannedSales { get; set; }
public int RealizedSales { get; set; }
public DateTime SalesDate { get; set; }
public string MonthYear { get; set; }
}
}
フォームがインスタンス化されると、メソッド CreateItems が呼び出されます。このメソッドは、ListにいくつかのデモStoreデータを取り込みます。
フォームのボタンが押されると、Linq を使用してリスト ストアが照会され、リスト ストアからMonthYearごとにすべてのPlannedSalesとRealizedSalesが返されます。 WHERE the StoreName = My Store 1
クエリ結果の例は次のとおりです: http://i49.tinypic.com/vz1c6.jpg
このクエリを最適化してよりシンプルにし、同じ結果を得る方法はありますか?
基本的に、特定の店舗名のみについて、月ごとの年間売上高と計画売上高をすべて返す必要があります。
ありがとう！