[英]Calculating total Balance of Particular Suburb C#
List<Customer> customers = new List<Customer>();
int id = 0;
int click = -1;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void AddButton_Click(object sender, EventArgs e)
{
Customer rec1 = new Customer("C0020", "Alfred", "Campbelltown", 1500, 2006);
Customer rec2 = new Customer("C0021", "Ryder", "Liverpool", 2000, 2008);
Customer rec3 = new Customer("C0022", "Alison", "Strathfield", 5500, 2012);
Customer rec4 = new Customer("C0023", "Eliza", "Liverpool", 6000, 2012);
Customer rec5 = new Customer("C0024", "Natsu", "Campbelltown", 2560, 2011);
customers.Add(rec1);
customers.Add(rec2);
customers.Add(rec3);
customers.Add(rec4);
customers.Add(rec5);
click = customers.Count - 1;
}
如何計算特定郊區的總余額? 我可以使用以下代碼計算所有內容的總余額:
double total = 0;
foreach (Customer Total in customers)
total += Total.Balance; //Total Balance
有任何想法嗎? 謝謝
在C#> = 3.5中最簡單的方法是使用LINQ:
customers.Where(c => c.Suburb == "whatever").Sum(c => c.Balance);
對不起,您沒有描述您的Customer
道具,所以我已經假設了它們。
var suburbGroups = customers
.GroupBy(c => c.Suburb)
.Select(g => new { Suburb = g.Key, Balance = g.Sum(c => c.Balance) })
.OrderByDescending(x => x.Balance);
foreach(var grp in suburbGroups)
Console.WriteLine("Suburb: {0} Total-Balance: {1}", grp.Suburb, grp.Balance);
請注意,您需要using System.Linq;
添加using System.Linq;
演示: http : //ideone.com/TQcgE
假設您的Customer
類中有Balance
屬性
var bal = customers.Sum(c => c.Balance); // customers is the collection
使用以下Linq表達式...
var balance=customers.GroupBy(g=>g.suburbname).Select(lg =>new { TotalBalance= lg.Sum(g => g.Balance)});
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