c# - 如何以编程方式选择 ListView 项目？

Question

从今天早上开始，我一直在寻找解决方案，即使在阅读了大量有关此主题的其他线程之后，它对我来说也不起作用。话不多说，让我们检查一下这个代码示例:

// Create Dictionary, Keys = Ids, Values = Names

Dictionary<int, string> ff_names = new Dictionary<int, string>();
ff_names.Add(0, "Cloud");
ff_names.Add(1, "Barret");
ff_names.Add(2, "Tifa");
ff_names.Add(3, "Aerith");
ff_names.Add(4, "Red XIII");

// Populating ListView

foreach( KeyValuePair<int, string> dict in ff_names )
{
    ListViewItem lvi = new ListViewItem(dict.Key.ToString());
    lvi.SubItems.Add(dict.Value);

    listView1.Items.Add(lvi);
}

// Test Item Selection

listView1.Focus();
listView1.Select();
listView1.Items[0].Focused = true;
listView1.Items[0].Selected = true;

string s = listView1.SelectedItems.Count.ToString();

label1.text = s; // sadly, it's equal to 0;
textBox1.Text = listView1.SelectedItems[0].SubItems[0].Text; // program will crash

从技术上讲，我想选择 ListView 的一项并在文本框中显示其元素之一。当我手动选择一个项目时它有效，但是当我尝试以编程方式选择(如上所示)时它不想选择任何内容，SelectedItems 计数等于零...

感谢您的帮助，希望有人能找到我所缺少的解决方案!

Answer 1

给你。您必须为 listView1_SelectedIndexChanged 创建事件处理程序。

    public Form1() {
        InitializeComponent();
        listView1.View = View.Details;
        listView1.Columns.Add("Key");
        listView1.Columns.Add("Value");
        LoadListView();
    }

    private void LoadListView() {
        // Create Dictionary, Keys = Ids, Values = Names

        Dictionary<int, string> ff_names = new Dictionary<int, string>();
        ff_names.Add(0, "Cloud");
        ff_names.Add(1, "Barret");
        ff_names.Add(2, "Tifa");
        ff_names.Add(3, "Aerith");
        ff_names.Add(4, "Red XIII");

        // Populating ListView

        foreach (KeyValuePair<int, string> dict in ff_names) {
            ListViewItem lvi = new ListViewItem(new string[] { dict.Key.ToString(), dict.Value });
            listView1.Items.Add(lvi);
        }

        // Test Item Selection

        listView1.Focus();
        listView1.Select();
        listView1.Items[0].Focused = true;
        listView1.Items[0].Selected = true;

    }

    private void listView1_SelectedIndexChanged(object sender, EventArgs e) {
        if (listView1.SelectedItems.Count > 0) {
            label1.Text = (string)listView1.SelectedItems[0].Text; // sadly, it's equal to 0;
            textBox1.Text = (string)listView1.SelectedItems[0].SubItems[1].Text;
        }
    }