Question

我正在制作WinForm C＃应用程序。我有一个按钮，它将搜索一个字符串并在其旁边给出值。这是我的代码：

WebRequest Request = WebRequest.Create(Settings.Default.FoodList);
WebResponse Response = Request.GetResponse();
StreamReader sr = new System.IO.StreamReader(Response.GetResponseStream());

string foods = sr.ReadToEnd();
string item = TXTSearchItem.Text;

try
{
    var startIndex = foods.IndexOf(item + "-", StringComparison.CurrentCultureIgnoreCase);
    var dashIndex = foods.IndexOf("-", startIndex);
    var endIndex = foods.IndexOf("\r\n", startIndex);
    var foodName = foods.Substring(startIndex, dashIndex - startIndex);
    var footCount = foods.Substring(dashIndex + 1, endIndex - dashIndex - 1);
    MessageBox.Show($"Item {foodName} is worth {footCount} SmartPoints.", "Item search", MessageBoxButtons.OK, info);
}
catch (Exception Ex)
{
    MessageBox.Show("Item was not found.", "Item search", MessageBoxButtons.OK, warning);
}

由于某种原因，它不会获得最后一个字符串。这是字符串包含的内容：

   goldfish-4
   eggs-0
   banana-0
   chicken-0
   apple-0
   grapes-0

如果我输入grapes，它将表示找不到该项目。但是，如果我有一个显示食物字符串的MessageBox，它将正确显示它。请帮忙。谢谢

Answer 1

也许，在这里使用import java.awt.BorderLayout; import java.awt.Container; import javax.swing.*; public class InternalFrameTest { public static void main(String args[]) { JFrame frame = new JFrame("Internal Frame Listener"); Container contentPane = frame.getContentPane(); JLayeredPane desktop = new JDesktopPane(); desktop.setOpaque(false); desktop.add(createLayer("One"), JLayeredPane.POPUP_LAYER); desktop.add(createLayer("Two"), JLayeredPane.DEFAULT_LAYER); desktop.add(createLayer("Three"), JLayeredPane.PALETTE_LAYER); contentPane.add(desktop, BorderLayout.CENTER); frame.setSize(300, 300); frame.show(); } static JInternalFrame createLayer(String label) { return new SelfInternalFrame(label); } static class SelfInternalFrame extends JInternalFrame { SelfInternalFrame mySelf = this; InternalFrameListener listener = new InternalFrameListener() { public void internalFrameActivated(InternalFrameEvent e) { dumpInfo("Activated", e); InternalFrameEvent e5 = new InternalFrameEvent(mySelf, InternalFrameEvent.INTERNAL_FRAME_DEICONIFIED); mySelf.dispatchEvent(e5); } public void internalFrameClosed(InternalFrameEvent e) { dumpInfo("Closed", e); } public void internalFrameClosing(InternalFrameEvent e) { dumpInfo("Closing", e); } public void internalFrameDeactivated(InternalFrameEvent e) { dumpInfo("Deactivated", e); } public void internalFrameDeiconified(InternalFrameEvent e) { dumpInfo("Deiconified", e); } public void internalFrameIconified(InternalFrameEvent e) { dumpInfo("Iconified", e); } public void internalFrameOpened(InternalFrameEvent e) { dumpInfo("Opened", e); } private void dumpInfo(String s, InternalFrameEvent e) { System.out.println("Source: " + e.getInternalFrame().getName() + " : " + s); } }; public SelfInternalFrame(String s) { getContentPane().add(new JLabel(s, JLabel.CENTER), BorderLayout.CENTER); setName(s); addInternalFrameListener(listener); setBounds(50, 50, 100, 100); setResizable(true); setClosable(true); setMaximizable(true); setIconifiable(true); setTitle(s); setVisible(true); } } }更容易？可以通过这种方式完成：

string.Split()

Answer 2

字符串不是存储这些信息的好地方。如果这些商品的价格是唯一的（没有香蕉= 1，香蕉= 2）。您应该将其存储在反映这种唯一性的数据结构中，以简化搜索价格。

像Dictionary<string,int> ¹。

var input = @"   goldfish-4
eggs-0
banana-0
chicken-0
apple-0
grapes-0";

string pattern = @"(?<key>\w+)-(?<value>\d+)";
RegexOptions options = RegexOptions.Multiline;

var r = Regex.Matches(input, pattern, options)
            .Cast<Match>()
            .ToDictionary(
                m => m.Groups["key"].Value,
                m => int.Parse(m.Groups["value"].Value)
            );

：正则表达式说明：

然后轻松访问数据。甚至添加新产品或更改价格。而且，如果您需要再次将其存储在文件中，请使用一些序列化。

^{1：如果价格是一个整数。}

无法获取我想要的字符串？

2 个答案: