Question

我无法填充列表框。我最初得到了网站上某人的帮助，但似乎没有完全发挥作用。我试图用文本文件中的项目填充列表框到目前为止的代码：

namespace ACW2
{
    /// <summary>
    /// Interaction logic for InventoryWindow.xaml
    /// </summary>
    ///

    public partial class InventoryWindow : Window
    {
        public InventoryWindow()
        {
            InitializeComponent();

            categoryComboBox.Items.Add("All");
            categoryComboBox.Items.Add("Pizza");
            categoryComboBox.Items.Add("Burger");
            categoryComboBox.Items.Add("Sundry");
            categoryComboBox.SelectedValue = "All";

            PopulateList();
        }

        private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {


        }

        private void categoryComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

            PopulateList();
        }

        public void PopulateList()
        {
            listBox.Items.Clear();
            using (StreamReader sr = new StreamReader(@"inventory.txt"))
            {
                while (!sr.EndOfStream)
                {
                    for (int i = 0; i < 22; i++)
                    {
                        string StringListItem = sr.ReadLine();
                        if (!String.IsNullOrEmpty(StringListItem) &&
                           (categoryComboBox.SelectedItem != null &&
                           (StringListItem.Contains(categoryComboBox.SelectedItem.ToString()))))
                        listBox.Items.Add(StringListItem);
                    }
                }
            }
        }

    }
    }

它最终只有一个空的列表框。但是，这段代码确实填充了列表框，但我觉得这两个StreamReader好像是多余的：

namespace ACW2
{
    /// <summary>
    /// Interaction logic for InventoryWindow.xaml
    /// </summary>
    ///

    public partial class InventoryWindow : Window
    {
        public InventoryWindow()
        {
            InitializeComponent();

            categoryComboBox.Items.Add("All");
            categoryComboBox.Items.Add("Pizza");
            categoryComboBox.Items.Add("Burger");
            categoryComboBox.Items.Add("Sundry");
            categoryComboBox.SelectedValue = "All";
        }

        private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {


        }

        private void categoryComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            listBox.Items.Clear();

            StreamReader sr = new StreamReader("inventory.txt");
            string i = sr.ReadToEnd();
            string[] n = i.Split('\n');
            foreach (string s in n)
            {
                listBox.Items.Add(s);
            }
        }



        public void PopulateList()
        {
            listBox.Items.Clear();
            using (StreamReader sr = new StreamReader(@"inventory.txt"))
            {
                while (!sr.EndOfStream)
                {
                    for (int i = 0; i < 22; i++)
                    {
                        string StringListItem = sr.ReadLine();
                        if (!String.IsNullOrEmpty(StringListItem) &&
                           (categoryComboBox.SelectedItem != null &&
                           (StringListItem.Contains(categoryComboBox.SelectedItem.ToString()))))
                            listBox.Items.Add(StringListItem);
                    }
                }
            }
        }
    }
}

Answer 1

foreach (var line = File.ReadAllLines(@"inventory.txt"))
{
    listBox.Items.Add(line);
}

Answer 2

我不是通过代码隐藏来实现这一点，而是设置一个带有项目类型的ObservableCollection的ViewModel（例如字符串或更健壮的东西），并将ComboBox从XAML绑定到该集合属性名称。

通过这种方式，您可以更轻松地维护此应用程序+免费查看分离：）

＆＃13;

// SampleViewModel.cs
public ObservableCollection<string> Categories = new ObservableCollection<string>();

// SampleView.xaml
<Window.DataContext>
    <local:SampleViewModel/>
</Window.DataContext>

<ListView ItemSource="{Binding Categories}" />

＆＃13;

这应该这样做：）

C＃填充列表框

2 个答案: