有没有办法在winform的文本框中使用多个单词的自动完成功能？

Question

我想使用文本框的自动完成来显示建议的单词。例如，我输入 Tod……我的数据库中所有以“tod”开头的单词都会显示，但在我选择一个单词后，如果我输入另一个单词，例如“was”，下面将不会显示任何建议的单词。可能是因为字符串集合没有“today was”。我想显示仅以“was”而不是“today was”开头的建议词。我正在制作一个预测最常用词的项目。这是我的代码

public partial class Form1 : Form
{
    string[] arr = new string[] { "sn k", "sn k", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec" };



    public Form1()
    {
        InitializeComponent();

    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void txtInput_TextChanged(object sender, EventArgs e)
    {
        predict();
    }



    void predict()
    {

        txtInput.AutoCompleteMode = AutoCompleteMode.Suggest;
        txtInput.AutoCompleteSource = AutoCompleteSource.CustomSource;
        AutoCompleteStringCollection col = new AutoCompleteStringCollection();

        col.AddRange(arr);
        txtInput.AutoCompleteCustomSource = col;
    }
}

}

Answer 1

所以一个基本的“滚动你自己”的解决方案将像这样工作：

string[] arr = new string[] { "sn k", "sn k", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec" };

private ListBox autoListBox;

private void Form1_Load(object sender, EventArgs e)
{
    this.txtInput.TextChanged += txtInput_TextChanged;
    CreateAutocompleteListBox();
}

private void txtInput_TextChanged(object sender, EventArgs e)
{
    showAutoCompleteList();
}

private void CreateAutocompleteListBox()
{
    this.autoListBox = new ListBox()
    {
        Left = this.txtInput.Left,
        Top = this.txtInput.Top + this.txtInput.Height,
        Width = 100,
        Height = 75
    };

    this.autoListBox.Click += autoListBox_Click;
    this.autoListBox.KeyDown += autoListBox_KeyDown;
    this.autoListBox.Visible = false;
    this.Controls.Add(this.autoListBox);
}

private void autoListBox_Click(object sender, EventArgs e)
{
    AutocompleteFinished();
}

private void autoListBox_KeyDown(object sender, KeyEventArgs e)
{
    var finishCodes = new List<Keys> { Keys.Return, Keys.Space };
    if (finishCodes.Contains(e.KeyCode))
    {
        AutocompleteFinished();
    }
}

private string GetLastWord(TextBox txt)
{
    return (" " + txt.Text).Split(' ').LastOrDefault() ?? "";
}

private void showAutoCompleteList()
{
    this.autoListBox.Left = this.txtInput.Left;
    this.autoListBox.Top = this.txtInput.Top + this.txtInput.Height + 2;
    var lastWord = GetLastWord(this.txtInput);

    this.autoListBox.Items.Clear();
    this.autoListBox.Items.AddRange(this.arr.Where(aw => aw.ToLower().StartsWith(lastWord.ToLower())).ToArray());
    this.autoListBox.Visible = true;
}

private void txtInput_KeyDown(object sender, KeyEventArgs e)
{
    // These keys show auto-complete selector
    var activatorCodes = new List<Keys> { Keys.Up, Keys.Down };
    if (activatorCodes.Contains(e.KeyCode))
    {
        SwitchToAutoCompleteList();
    }
}

private void SwitchToAutoCompleteList()
{
    this.autoListBox.Focus();
    this.autoListBox.SelectedIndex = 0;
}

private void AutocompleteFinished()
{
    var lastWord = GetLastWord(this.txtInput);
    var nextWord = this.autoListBox.Text;
    this.txtInput.Text = this.txtInput.Text.Substring(0, this.txtInput.Text.Length - lastWord.Length);
    this.txtInput.AppendText(nextWord);
    this.autoListBox.Visible = false;
}

这应该做你想做的，它会为每个单词显示自动完成！可以添加一些技巧，例如随着文本的移动移动自动完成框。