Question

我正在做一个简单的直线折旧应用程序。我的列表框显示年份和折旧金额。在同一个列表框中，我想添加＆＃34;总计＆＃34;并总结所有折旧。我添加了应用程序应该如何显示的图片。顺便说一句，我们需要使用FOR循环。

private void calcButton_Click_1(object sender, EventArgs e)
{
    //Declare Vairables 
    double cost, salvage, depreciation;
    int usefulLife;
    int total = 0; 


    //grab data
    double.TryParse(assetCostTextBox.Text, out cost);
    double.TryParse(salvageValueTextBox.Text, out salvage);
    int.TryParse(usefulLifeNumericUpDown.Text, out usefulLife);

    //Print heading
    string formatCode = "{0,7}{1,20}";
    depreciationScheduleListBox.Items.Add(string.Format(formatCode, 
    "Years:", "Depreciation:"));
    depreciationScheduleListBox.Items.Add("");

    //use for loop to calculate deprecation value of each year
    int iterations = 0;
    for (iterations = 1; iterations <= usefulLife; iterations += 1)
    {
        depreciation = (cost - salvage) * 1/usefulLife;
        depreciationScheduleListBox.Items.Add(string.Format(formatCode, 
         iterations, depreciation.ToString("C2")));


    }

Here is a picture of the app

Answer 1

这个怎么样？

def fcopy(source, target):
    with open(source, 'rb') as f:
        data = f.read()
    with open(target, 'wb') as t:
        t.write(data)

fcopy("source.jpeg","dest.jpeg")

我将listBox的项目转换为IEnumerable。然后，我得到double total = depreciationScheduleListBox.Items.Cast<string>().Select((string item) => Convert.ToDouble(System.Text.RegularExpressions.Regex.Match(item, "Depreciation: \\$(.+)").Groups[1].Value)).ToArray().Sum();之后应该是数字的东西。然后，我将此字符串输出转换为Double并获得最终Depreciation: $然后获得其总和

如何在列表框中添加所有项目并显示＆＃34; total＆＃34;在同一个列表框中

1 个答案: