如何获取int数组的前3并在Listbox / ListView中显示值

Question

我想知道如何在使用数组的文本文件感兴趣之后找到金额中的前3个事务。基本上，当应用程序打开时，它会在列表框或列表视图框中加载前3个客户及其名称对应的现金值。

在文本文件中有许多数字，例如交易号，现金存款金额，利息后现金金额。我如何区分这些，以便它只是在感兴趣后找到前3个现金金额并显示名称？

private void Form5_Load(object sender, EventArgs e)
{
    int[] array = new int[10];
    Console.WriteLine("transactions.txt");
    for(int i=0;i<10;i++)
    {
        array[i] = Convert.ToInt32(Console.ReadLine());
    }

    int largest = array[9];
    for(int i=0;i<10;i++)
    {

        if (array[i] > largest)
        {
            largest = array[i];
        }
    }
    Console.WriteLine("The largest transaction amount is {0}", largest);
    Console.Read();
}

//Here is the code for whats in the transactions.txt file.
public void CreateFile()
{
    StreamWriter outputFile;
    outputFile = File.AppendText("transactions.txt");
    outputFile.WriteLine("Transaction Number :" + " " + TransactionIDLabel.Text);
    outputFile.WriteLine("Investor :" +" " + InvestorNameLabel.Text);
    outputFile.WriteLine("Initial Amount" + " " +AmountLabel.Text);
    outputFile.WriteLine("Date Invested" +" " +DateLabel.Text);
    outputFile.WriteLine("Period Chosen" + " "+DaysInvestedLabel.Text);
    outputFile.WriteLine("Rate Chosen" + " " + RateLabel.Text);
    outputFile.WriteLine("Total Interest" + " " +InterestAmountLabel.Text);
    outputFile.WriteLine("Total Amount" + " " + TotalAmountLabel.Text);
    outputFile.WriteLine("");
    outputFile.Close();
}

Answer 1

您需要做的更改才能让您获得前3名

• 变量最大为int数组int[] largest
• 使用OrderByDescending按降序对数组进行排序
• 使用Take(3)获取所需的交易
• msg变量仅用于较短的代码，否则stackoverflow上的代码窗口需要滚动

希望这有帮助，

int[] largest = array.OrderByDescending( item => item).Take(3).ToArray();
int count = 1;

string msg = "The {0} largest transaction amount is {1}";

foreach (var element in largest)
{         
    Console.WriteLine(msg, count++,element);   
} 

---

以下是listbox和listview的示例代码

private void button1_Click(object sender, EventArgs e)
{
   int[] array = new int[] { 1, 3, 4, 5, 6, 7, 8, 99, 22, 44 };
   int[] largest = array
                    .OrderByDescending(item => item)
                    .Take(array.Length).ToArray();

     foreach (var element in largest)
     {
           listBox1.Items.Add(element);
           listView1.Items.Add(new ListViewItem(element.ToString()));
     }
}

这就是它的样子

Answer 2

我建议将每一行读入一个对象/结构实例，然后使用类似

的内容获取前三行

新列表（[如果你仍然使用数组来保存它们]）。OrderByDescending（x =＆gt; x.Amount）.Take（3）;