如何在winforms桌面应用程序中创建自动完成文本框

Question

我有一个单词列表.该列表包含大约100-200个文本字符串(实际上是地铁站的名称).

我想制作一个自动完成的文本框.例如,用户按'N'字母,然后出现(结束)适当选项(仅一个选项).必须选择结尾.

怎么做？

PS1:我想,有一个文本框控件,其属性如下:

List<string> AppropriateOptions{/* ... */}

PS2:对不起我的英语.如果你不明白 - >问我,我会尽力解释!

Answer 1

为了防止@ leniel的链接断开,这里有一些代码可以解决这个问题:

AutoCompleteStringCollection allowedTypes = new AutoCompleteStringCollection();
allowedTypes.AddRange(yourArrayOfSuggestions);
txtType.AutoCompleteCustomSource = allowedTypes;
txtType.AutoCompleteMode = AutoCompleteMode.Suggest;
txtType.AutoCompleteSource = AutoCompleteSource.CustomSource;

Answer 2

使用组合框而不是文本框。以下示例将自动完成，匹配文本的任何部分，而不仅仅是起始字母。

这应该是一个完整的表单，只需添加您自己的数据源和数据源列名称。:-)

using System;
using System.Data;
using System.Windows.Forms;

public partial class frmTestAutocomplete : Form
{

    private DataTable maoCompleteList;
    private const string MC_DISPLAY_COL = "name";
    private const string MC_ID_COL = "id";

    public frmTestAutocomplete()
    {
        InitializeComponent();
    }

    private void frmTestAutocomplete_Load(object sender, EventArgs e)
    {

        maoCompleteList = GetDataTableFromDatabase();
        maoCompleteList.CaseSensitive = false; //turn off case sensitivity for searching

        testCombo.DisplayMember = MC_DISPLAY_COL;
        testCombo.ValueMember = MC_ID_COL;
        testCombo.DataSource = maoCompleteList;
        testCombo.SelectedIndexChanged += testCombo_SelectedIndexChanged;
        testCombo.KeyUp += testCombo_KeyUp;
    }


    private void testCombo_KeyUp(object sender, KeyEventArgs e)
    {
        //use keyUp event, as text changed traps too many other evengts.

        ComboBox oBox = (ComboBox)sender;
        string sBoxText = oBox.Text;

        DataRow[] oFilteredRows = maoCompleteList.Select(MC_DISPLAY_COL + " Like '%" + sBoxText + "%'");

        DataTable oFilteredDT = oFilteredRows.Length > 0
                                ? oFilteredRows.CopyToDataTable()
                                : maoCompleteList;

        //NOW THAT WE HAVE OUR FILTERED LIST, WE NEED TO RE-BIND IT WIHOUT CHANGING THE TEXT IN THE ComboBox.

        //1).UNREGISTER THE SELECTED EVENT BEFORE RE-BINDING, b/c IT TRIGGERS ON BIND.
        oBox.SelectedIndexChanged -= testCombo_SelectedIndexChanged; //don't select on typing.
        oBox.DataSource = oFilteredDT; //2).rebind to filtered list.
        oBox.SelectedIndexChanged += testCombo_SelectedIndexChanged;


        //3).show the user the new filtered list.
        oBox.DroppedDown = true; //this will overwrite the text in the ComboBox, so 4&5 put it back.

        //4).binding data source erases text, so now we need to put the user's text back,
        oBox.Text = sBoxText;
        oBox.SelectionStart = sBoxText.Length; //5). need to put the user's cursor back where it was.


    }

    private void testCombo_SelectedIndexChanged(object sender, EventArgs e)
    {

        ComboBox oBox = (ComboBox)sender;

        if (oBox.SelectedValue != null)
        {
            MessageBox.Show(string.Format(@"Item #{0} was selected.", oBox.SelectedValue));
        }
    }

}

//=====================================================================================================
//      code from frmTestAutocomplete.Designer.cs
//=====================================================================================================
partial class frmTestAutocomplete

{
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private readonly System.ComponentModel.IContainer components = null;

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Windows Form Designer generated code

    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.testCombo = new System.Windows.Forms.ComboBox();
        this.SuspendLayout();
        // 
        // testCombo
        // 
        this.testCombo.FormattingEnabled = true;
        this.testCombo.Location = new System.Drawing.Point(27, 51);
        this.testCombo.Name = "testCombo";
        this.testCombo.Size = new System.Drawing.Size(224, 21);
        this.testCombo.TabIndex = 0;
        // 
        // frmTestAutocomplete
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(292, 273);
        this.Controls.Add(this.testCombo);
        this.Name = "frmTestAutocomplete";
        this.Text = "frmTestAutocomplete";
        this.Load += new System.EventHandler(this.frmTestAutocomplete_Load);
        this.ResumeLayout(false);

    }

    #endregion

    private System.Windows.Forms.ComboBox testCombo;
}

Answer 3

您想要设置TextBox.AutoCompleteSourceto CustomSource，然后将所有字符串添加到其AutoCompleteCustomSource属性中，该属性是StringCollection. 那么你应该可以走了。