一个根据根据输入内容自动匹配的下来列表框，且支持拼音字母

DropdownListNew.designer.cs

namespace GPOS.Controls
{
    partial class DropdownListNew
    {
        /// <summary> 
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary> 
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region 组件设计器生成的代码

        /// <summary> 
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.tbxControl = new DevComponents.DotNetBar.Controls.TextBoxX();
            this.lbRecordList = new System.Windows.Forms.ListBox();
            this.SuspendLayout();
            // 
            // tbxControl
            // 
            // 
            // 
            // 
            this.tbxControl.Border.BorderBottom = DevComponents.DotNetBar.eStyleBorderType.Solid;
            this.tbxControl.Border.BorderBottomWidth = 1;
            this.tbxControl.Border.BorderColorSchemePart = DevComponents.DotNetBar.eColorSchemePart.DockSiteBackColor;
            this.tbxControl.Border.BorderLeft = DevComponents.DotNetBar.eStyleBorderType.Solid;
            this.tbxControl.Border.BorderLeftWidth = 1;
            this.tbxControl.Border.BorderRight = DevComponents.DotNetBar.eStyleBorderType.Solid;
            this.tbxControl.Border.BorderRightWidth = 1;
            this.tbxControl.Border.BorderTop = DevComponents.DotNetBar.eStyleBorderType.Solid;
            this.tbxControl.Border.BorderTopWidth = 1;
            this.tbxControl.Border.Class = "";
            this.tbxControl.Border.CornerType = DevComponents.DotNetBar.eCornerType.Square;
            this.tbxControl.Dock = System.Windows.Forms.DockStyle.Top;
            this.tbxControl.Location = new System.Drawing.Point(0, 0);
            this.tbxControl.Name = "tbxControl";
            this.tbxControl.Size = new System.Drawing.Size(189, 16);
            this.tbxControl.TabIndex = 0;
            this.tbxControl.KeyDown += new System.Windows.Forms.KeyEventHandler(this.tbxControl_KeyDown);
            this.tbxControl.Leave += new System.EventHandler(this.tbxControl_Leave);
            this.tbxControl.TextChanged += new System.EventHandler(this.tbxControl_TextChanged);
            // 
            // lbRecordList
            // 
            this.lbRecordList.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.lbRecordList.Dock = System.Windows.Forms.DockStyle.Fill;
            this.lbRecordList.FormattingEnabled = true;
            this.lbRecordList.ItemHeight = 12;
            this.lbRecordList.Location = new System.Drawing.Point(0, 16);
            this.lbRecordList.Name = "lbRecordList";
            this.lbRecordList.Size = new System.Drawing.Size(189, 2);
            this.lbRecordList.TabIndex = 1;
            this.lbRecordList.Leave += new System.EventHandler(this.lbRecordList_Leave);
            this.lbRecordList.DoubleClick += new System.EventHandler(this.lbRecordList_DoubleClick);
            this.lbRecordList.KeyDown += new System.Windows.Forms.KeyEventHandler(this.lbRecordList_KeyDown);
            // 
            // DropdownListNew
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.Controls.Add(this.lbRecordList);
            this.Controls.Add(this.tbxControl);
            this.Name = "DropdownListNew";
            this.Size = new System.Drawing.Size(189, 23);
            this.Load += new System.EventHandler(this.TextBoxWithDataPick_Load);
            this.ResumeLayout(false);

        }

        #endregion

        private DevComponents.DotNetBar.Controls.TextBoxX tbxControl;
        private System.Windows.Forms.ListBox lbRecordList;  
    }
}

DropdownListNew.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace GPOS.Controls
{
    public partial class DropDownListSelect : UserControl
    {
        private string _ControlValue;
        private int _ControlHeight = 21;
        private int _ControlWidth = 189;
        private int _CurrentCellIndex = 0;
        private bool _IsViewColValue = false;
        private bool _IsSupportPinYin = false;
        #region 公有变量
        /// <summary>
        /// 文本
        /// </summary>
        public string ControlText
        {
            get { return tbxControl.Text; }
            set { tbxControl.Text = value;
            if (ControlValueChanged != null)
            {
                ControlValueChanged(this);
            }
            }
        }
        public delegate void ControlValueChangedHandel(object sender);
        public event ControlValueChangedHandel ControlValueChanged;
        /// <summary>
        /// 获取值
        /// </summary>
        public string ControlValue
        {
            get { return GetControlValue(); }
            set
            {
                _ControlValue = value;
                SetControlText();
                if (ControlValueChanged != null)
                {
                    ControlValueChanged(this);
                }
            }
        }
        public int ControlWidth
        {
            get { return _ControlWidth; }
            set
            {
                _ControlWidth = value;
                this.Width = _ControlWidth;
                tbxControl.Width = _ControlWidth;
            }
        }
        protected override Size DefaultSize
        {
            get
            {
                return new Size(100, 50);
            }
        }
        /// <summary>
        /// 暂时无用
        /// </summary>
        public int ControlHeight
        {
            get { return _ControlHeight; }
            set
            {
                _ControlHeight = value;
                this.Height = _ControlHeight;
                tbxControl.Height = _ControlHeight;
            }
        }
        /// <summary>
        /// 是否显示Value列
        /// </summary>
        public bool IsViewColValue
        {
            get { return _IsViewColValue; }
            set
            {
                _IsViewColValue = value;
            }
        }
        /// <summary>
        /// 是否支持拼音检索（如果支持需加AllSpelling,FirstSpelling）
        /// </summary>
        public bool IsSupportPinYin
        {
            get { return _IsSupportPinYin; }
            set
            {
                _IsSupportPinYin = value;
            }
        }
        /// <summary>
        /// 可供用户选择的数据集
        /// </summary>
        public DataTable ControlDataSource = null;
        /// <summary>
        /// 在ControlDataSource中的列名
        /// </summary>
        public string ControlColumnName = "";

        /// <summary>
        /// 获取的值
        /// </summary>
        public string ControlValueColumnName = "";
        #endregion
        public DropDownListSelect()
        {
            InitializeComponent();
        }
        #region 自定义函数
        private string GetControlValue()
        {
            if (!string.IsNullOrEmpty(tbxControl.Text))
            {
                //这些情况下,不弹出选择框  
                if (ControlDataSource == null || ControlColumnName == "" || !ControlDataSource.Columns.Contains(ControlColumnName))
                    return "";
                //根据用户当前输入的内容,筛选出与内容相符的记录,显示在列表框中  
                for (int i = 0; i < ControlDataSource.Rows.Count; i++)
                {
                    if (ControlDataSource.Rows[i][ControlColumnName].ToString().Trim() == tbxControl.Text.Trim())
                    {
                        return ControlDataSource.Rows[i][ControlValueColumnName].ToString();
                    }
                }
            }
            return "";
        }

        private void SetControlText()
        {
            if (!string.IsNullOrEmpty(_ControlValue))
            {
                //这些情况下,不弹出选择框  
                if (ControlDataSource == null || ControlColumnName == "" || !ControlDataSource.Columns.Contains(ControlColumnName))
                    return;
                //根据用户当前输入的内容,筛选出与内容相符的记录,显示在列表框中  
                for (int i = 0; i < ControlDataSource.Rows.Count; i++)
                {
                    if (ControlDataSource.Rows[i][ControlValueColumnName].ToString().Trim() == _ControlValue)
                    {
                        tbxControl.Text = ControlDataSource.Rows[i][ControlColumnName].ToString();
                        this.Height = tbxControl.Height;
                        this.plRecordList.Visible = false;
                        this.SendToBack();
                    }
                }
            }
        }
        #endregion
        #region tbxControl事件
        private void tbxControl_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyValue == (int)Keys.Down)
            {
                if (dgvRecordList.Rows.Count != 0)
                {
                    dgvRecordList.Focus();
                }
            }
            int currentrowindex = -1;
            if (dgvRecordList.SelectedRows.Count > 0)
            {
                currentrowindex = dgvRecordList.SelectedRows[0].Index;
            }
            else if (dgvRecordList.SelectedCells.Count > 0)
            {
                currentrowindex = dgvRecordList.SelectedCells[0].RowIndex;
            }
            switch (e.KeyCode)
            {
                case Keys.Up:
                    if (plRecordList.Visible)
                    {
                        dgvRecordList.Focus();
                    }
                    if (currentrowindex > 0)
                    {
                        dgvRecordList.Rows[currentrowindex].Selected = false;
                        dgvRecordList.Rows[currentrowindex - 1].Selected = true;
                    }

                    break;
                case Keys.Down:
                    if (plRecordList.Visible)
                    {
                        dgvRecordList.Focus();
                    }
                    if (currentrowindex == -1)
                    {
                        if (dgvRecordList.Rows.Count > 0)
                        {
                            dgvRecordList.Rows[0].Selected = true;
                        }
                    }
                    else if (currentrowindex < dgvRecordList.Rows.Count - 1)
                    {
                        dgvRecordList.Rows[currentrowindex].Selected = false;
                        dgvRecordList.Rows[currentrowindex + 1].Selected = true;
                    }
                    else if (currentrowindex > 0)
                    {
                        dgvRecordList.Rows[currentrowindex].Selected = false;
                        dgvRecordList.Rows[0].Selected = true;
                    }
                    break;
                case Keys.Enter:
                    if (plRecordList.Visible)
                    {
                        dgvRecordList.Focus();
                    }
                    if (currentrowindex > -1)
                    {
                        tbxControl.Text = dgvRecordList[1, currentrowindex].Value.ToString();
                    }
                    this.Height = tbxControl.Height;
                    this.plRecordList.Visible = false;
                    this.SendToBack();
                    break;
                case Keys.Space:
                    if (currentrowindex > -1)
                    {
                        tbxControl.Text = dgvRecordList[1, currentrowindex].Value.ToString();
                    }
                    this.Height = tbxControl.Height;
                    this.plRecordList.Visible = false;
                    this.SendToBack();
                    break;
                case Keys.Escape:
                    this.Height = tbxControl.Height;
                    this.plRecordList.Visible = false;
                    this.SendToBack();
                    break;
            }
        }

        private void tbxControl_Leave(object sender, EventArgs e)
        {
            if (dgvRecordList.Focused == false)
            {
                this.Height = tbxControl.Height;
                this.plRecordList.Visible = false;
                this.SendToBack();
            }
        }

        private void tbxControl_TextChanged(object sender, EventArgs e)
        {
            if (this.tbxControl.Text == "")
            {
                this.Height = tbxControl.Height;
                this.plRecordList.Visible = false;
                this.SendToBack();
                return;
            }
            //这些情况下,不弹出选择框  
            if (ControlDataSource == null || ControlColumnName == "" || !ControlDataSource.Columns.Contains(ControlColumnName))
                return;
            //根据用户当前输入的内容,筛选出与内容相符的记录,显示在列表框中  
            this.dgvRecordList.Columns.Clear();

            for (int i = 0; i < ControlDataSource.Columns.Count; i++)
            {
                dgvRecordList.Columns.Add(ControlDataSource.Columns[i].Caption, ControlDataSource.Columns[i].Caption);
                dgvRecordList.Columns[i].DataPropertyName = ControlDataSource.Columns[i].Caption;
                dgvRecordList.Columns[i].ReadOnly = true;
                if (ControlDataSource.Columns[i].Caption == ControlColumnName)
                {
                    _CurrentCellIndex = i;
                }
                if (ControlDataSource.Columns[i].Caption == ControlValueColumnName || ControlDataSource.Columns[i].Caption == "AllSpelling" || ControlDataSource.Columns[i].Caption == "FirstSpelling")
                {
                    if (!IsViewColValue)
                        dgvRecordList.Columns[i].Visible = false;
                }

            }
            DataRow[] drArr = ControlDataSource.Select(ControlColumnName + " like '%" + tbxControl.Text + "%'");
            if (IsSupportPinYin)
            {
                drArr = ControlDataSource.Select(ControlColumnName + " like '%" + tbxControl.Text + "%' or SUBSTRING(AllSpelling,1," + tbxControl.Text.Length + ")='" + tbxControl.Text + "' or SUBSTRING(FirstSpelling,1," + tbxControl.Text.Length + ")='" + tbxControl.Text + "'");
            }
            DataTable dtNew = ControlDataSource.Clone();
            for (int i = 0; i < drArr.Length; i++)
            {
                dtNew.ImportRow(drArr[i]);

            }
            dgvRecordList.DataSource = dtNew;
            //如果记录数不为0,则将列表显示出来  
            if (dgvRecordList.Rows.Count == 0)
            {
                this.Height = tbxControl.Height;
                this.plRecordList.Visible = false;
                this.SendToBack();
            }
            else
            {
                if (dgvRecordList.Rows.Count == 1)
                {
                    this.Height = tbxControl.Height + 40 * dgvRecordList.Rows.Count;
                    if (this.Width < plRecordList.Width)
                    {
                        this.Width = plRecordList.Width;
                    }
                    this.plRecordList.Visible = true;
                    this.BringToFront();
                }
                else if (dgvRecordList.Rows.Count < 8)
                {
                    this.Height = tbxControl.Height + 24 * dgvRecordList.Rows.Count;
                    if (this.Width < plRecordList.Width)
                    {
                        this.Width = plRecordList.Width;
                    }
                    this.plRecordList.Visible = true;
                    this.BringToFront();
                }
                else
                {
                    this.Height = tbxControl.Height + 208;
                    if (this.Width < plRecordList.Width)
                    {
                        this.Width = plRecordList.Width;
                    }
                    this.plRecordList.Visible = true;
                    this.BringToFront();
                }
            }
        }
        #endregion
        #region dgvRecordList事件
        private void dgvRecordList_KeyDown(object sender, KeyEventArgs e)
        {
            int currentrowindex = -1;
            if (dgvRecordList.SelectedRows.Count > 0)
            {
                currentrowindex = dgvRecordList.SelectedRows[0].Index;
            }
            else if (dgvRecordList.SelectedCells.Count > 0)
            {
                currentrowindex = dgvRecordList.SelectedCells[0].RowIndex;
            }
            switch (e.KeyCode)
            {
                case Keys.Up:
                    if (plRecordList.Visible)
                    {
                        dgvRecordList.Focus();
                    }
                    if (currentrowindex > 0)
                    {
                        dgvRecordList.Rows[currentrowindex].Selected = false;
                        dgvRecordList.Rows[currentrowindex - 1].Selected = true;
                    }

                    break;
                case Keys.Down:
                    if (plRecordList.Visible)
                    {
                        dgvRecordList.Focus();
                    }
                    if (currentrowindex == -1)
                    {
                        if (dgvRecordList.Rows.Count > 0)
                        {
                            dgvRecordList.Rows[0].Selected = true;
                        }
                    }
                    else if (currentrowindex < dgvRecordList.Rows.Count - 1)
                    {
                        dgvRecordList.Rows[currentrowindex].Selected = false;
                        dgvRecordList.Rows[currentrowindex + 1].Selected = true;
                    }
                    else if (currentrowindex > 0)
                    {
                        dgvRecordList.Rows[currentrowindex].Selected = false;
                        dgvRecordList.Rows[0].Selected = true;
                    }
                    break;
                case Keys.Enter:
                    if (plRecordList.Visible)
                    {
                        dgvRecordList.Focus();
                    }
                    if (currentrowindex > -1)
                    {
                        tbxControl.Text = dgvRecordList[_CurrentCellIndex, currentrowindex].Value.ToString();
                    }
                    this.Height = tbxControl.Height;
                    this.plRecordList.Visible = false;
                    this.SendToBack();
                    break;
                case Keys.Space:
                    if (currentrowindex > -1)
                    {
                        tbxControl.Text = dgvRecordList[_CurrentCellIndex, currentrowindex].Value.ToString();
                    }
                    this.Height = tbxControl.Height;
                    this.plRecordList.Visible = false;
                    this.SendToBack();
                    break;
                case Keys.Escape:
                    this.Height = tbxControl.Height;
                    this.plRecordList.Visible = false;
                    this.SendToBack();
                    break;
            }
        }

        private void dgvRecordList_Click(object sender, EventArgs e)
        {
            int currentrowindex = -1;
            if (dgvRecordList.SelectedRows.Count > 0)
            {
                currentrowindex = dgvRecordList.SelectedRows[0].Index;
            }
            else if (dgvRecordList.SelectedCells.Count > 0)
            {
                currentrowindex = dgvRecordList.SelectedCells[0].RowIndex;
            }
            if (currentrowindex > -1)
            {
                tbxControl.Text = dgvRecordList[_CurrentCellIndex, currentrowindex].Value.ToString();
            }
            this.Height = tbxControl.Height;
            this.plRecordList.Visible = false;
            this.SendToBack();
        }

        private void dgvRecordList_DoubleClick(object sender, EventArgs e)
        {
            int currentrowindex = -1;
            if (dgvRecordList.SelectedRows.Count > 0)
            {
                currentrowindex = dgvRecordList.SelectedRows[0].Index;
            }
            else if (dgvRecordList.SelectedCells.Count > 0)
            {
                currentrowindex = dgvRecordList.SelectedCells[0].RowIndex;
            }
            if (currentrowindex > -1)
            {
                tbxControl.Text = dgvRecordList[_CurrentCellIndex, currentrowindex].Value.ToString();
            }
            this.Height = tbxControl.Height;
            this.plRecordList.Visible = false;
            this.SendToBack();
        }

        private void dgvRecordList_Leave(object sender, EventArgs e)
        {
            if (tbxControl.Focused == false)
            {
                this.Height = tbxControl.Height;
                this.plRecordList.Visible = false;
                this.SendToBack();
            }
        }
        #endregion
        #region 窗体装载
        private void DropDownListSelect_Load(object sender, EventArgs e)
        {
            //控件载入时,将高度缩为与TextBox相等  
            //this.Height = tbxControl.Height;
            #region 控制datagridview的样式
            dgvRecordList.BackColor = System.Drawing.Color.AliceBlue;
            //dgvRecordList.AlternatingRowsDefaultCellStyle = dataGridViewCellStyle;
            dgvRecordList.BackgroundColor = System.Drawing.Color.Beige;
            dgvRecordList.ColumnHeadersVisible = false;
            dgvRecordList.RowHeadersVisible = false;
            this.dgvRecordList.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dgvRecordList.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect;
            this.dgvRecordList.AllowUserToOrderColumns = false;
            this.dgvRecordList.AllowUserToAddRows = false;
            this.dgvRecordList.AllowUserToDeleteRows = false;
            this.dgvRecordList.AllowUserToResizeRows = false;
            this.dgvRecordList.MultiSelect = false;
            dgvRecordList.BorderStyle = BorderStyle.None;
            dgvRecordList.ScrollBars = ScrollBars.Both;
            dgvRecordList.AllowUserToResizeColumns = false;
            dgvRecordList.AutoGenerateColumns = false;
            this.dgvRecordList.Columns.Clear();
            #endregion
        }
        #endregion
    }
}