调用控件：
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
//---------------------------------------
//设置dataWindow1属性
this.dataWindow1.PopupGridAutoSize = false;
this.dataWindow1.DropDownHeight = 300;
this.dataWindow1.DropDownWidth = 340;
this.dataWindow1.DataSource = GetDataTable();//DataTable 类型
this.dataWindow1.RowFilterVisible = false;
this.dataWindow1.AfterSelector += new EventHandler(dataWindow1_AfterSelector);
}
//选择完下拉表格后执行的事件
private void dataWindow1_AfterSelector(object sender, EventArgs e)
{
textBox1.Text = dataWindow1.GetDataProperty("username");
textBox2.Text = dataWindow1.GetDataProperty("department");
textBox3.Text = dataWindow1.GetDataProperty("postion");
}
重写ComboBox控件代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Design;
namespace WindowsApplication21
{
public class DataWindow : ComboBox
{
#region 成员变量
private const int WM_LBUTTONDOWN = 0x201, WM_LBUTTONDBLCLK = 0x203;
ToolStripControlHost dataGridViewHost;
ToolStripControlHost textBoxHost;
ToolStripDropDown dropDown;
private string m_sKeyWords = "";
private string m_sDisplayMember = "";
private string m_sValueMember = "";
private string m_sDisplayField = "";
private string m_Separator = "|";
private string m_NullValue = "";
private bool m_blDropShow = false;
private bool m_blPopupAutoSize = false;
private int m_SelectedIndex=-1;
public event EventHandler AfterSelector;
#endregion
#region 构造函数
public DataWindow()
{
DrawDataGridView();
}
#endregion
#region 属性
[Description("空值时的默认值"), Browsable(true), Category("N8")]
public string NullValue
{
set
{
m_NullValue = value;
}
get
{
return m_NullValue;
}
}
[Description("查询关键字"), Browsable(true), Category("N8")]
public string sKeyWords
{
get
{
return m_sKeyWords;
}
set
{
m_sKeyWords = value;
}
}
[Description("文本框显示字段用逗号分割！"), Browsable(true), Category("N8")]
public string sDisplayMember
{
set
{
m_sDisplayMember = value;
}
get
{
return m_sDisplayMember;
}
}
[Description("是否显示条件输入窗口！"), Browsable(true), Category("N8")]
public bool RowFilterVisible
{
set
{
dropDown.Items[0].Visible = value;
}
get
{
return dropDown.Items[0].Visible;
}
}
[Description("取值字段"), Browsable(true), Category("N8")]
public string sValueMember
{
set
{
m_sValueMember = value;
}
get
{
return m_sValueMember;
}
}
public DataView DataView
{
get
{
DataTable dataTable = GetDataTableFromDataSource();
if (dataTable == null)
{
return null;
}
return dataTable.DefaultView;
}
}
[Description("设置DataGridView属性"), Browsable(true), Category("N8")]
public DataGridView DataGridView
{
get
{
return dataGridViewHost.Control as DataGridView;
}
}
public TextBox TextBox
{
get
{
return textBoxHost.Control as TextBox;
}
}
[Description("下拉表格显示列，空为显示所有列！"), Browsable(true), Category("N8")]
public string sDisplayField
{
set
{
m_sDisplayField = value;
}
get
{
return m_sDisplayField;
}
}
[Description("数据源"), Browsable(true), Category("N8")]
public new Object DataSource
{
set
{
if (m_sDisplayField != String.Empty)
{
DataGridView.Columns.Clear();
DataGridView.AutoGenerateColumns=false;
string[] sDisplayFields = m_sDisplayField.Split(',');
foreach (string sDisplay in sDisplayFields)
{
DataGridViewTextBoxColumn dgvCell = new DataGridViewTextBoxColumn();
dgvCell.Name = sDisplay;
dgvCell.DataPropertyName = sDisplay;
DataGridView.Columns.Add(dgvCell);
}
}
DataGridView.DataSource = value;
}
get
{
return DataGridView.DataSource;
}
}
[Description("下拉表格尺寸是否为自动"), Browsable(true), Category("N8")]
public bool PopupGridAutoSize
{
set
{
m_blPopupAutoSize = value;
}
get
{
return m_blPopupAutoSize;
}
}
[Description("分割符号"), Browsable(true), Category("N8")]
public string SeparatorChar
{
set
{
m_Separator = value;
}
get
{
return m_Separator;
}
}
[Browsable(false), Bindable(true)]
public string Value
{
get
{
if (Text == String.Empty)
{
m_SelectedIndex = -1;
}
if (!String.IsNullOrEmpty(m_sValueMember))
{
if (DataView == null)
{
return Text;
}
if (m_SelectedIndex > -1)
{
object obj = DataView[m_SelectedIndex][m_sValueMember];
return obj.ToString();
}
else
{
return m_NullValue;
}
}
else
{
return Text;
}
}
set
{
int i = 0;
if (m_sValueMember == String.Empty)
{
Text = value;
}
else
{
Text = "";
if (DataView != null)
{
DataView.RowFilter = "";
foreach (DataRowView dataRowView in DataView)
{
if (dataRowView[m_sValueMember].ToString() == value)
{
m_SelectedIndex = i;
string[] sDisplayList = m_sDisplayMember.Split(',');
foreach (string sDisplay in sDisplayList)
{
if (DataGridView.Columns.Contains(sDisplay))
{
object obj = DataView[m_SelectedIndex][sDisplay];
Text += obj.ToString() + m_Separator;
}
}
Text = Text.TrimEnd('|');
break;
}
i++;
}
}
}
}
}
#endregion
#region 方法
#region 绘制DataGridView以及下拉DataGridView
private void DrawDataGridView()
{
DataGridView dataGridView = new DataGridView();
dataGridView.BackgroundColor = SystemColors.ActiveCaptionText;
dataGridView.BorderStyle = BorderStyle.None;
dataGridView.ReadOnly = true;
dataGridView.AllowUserToAddRows = false;
dataGridView.RowHeadersVisible = false;
dataGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
dataGridView.DoubleClick += new EventHandler(dataGridView_DoubleClick);
dataGridView.KeyDown += new KeyEventHandler(dataGridView_KeyDown);
//设置DataGridView的数据源
Form frmDataSource = new Form();
frmDataSource.Controls.Add(dataGridView);
frmDataSource.SuspendLayout();
dataGridViewHost = new ToolStripControlHost(dataGridView);
dataGridViewHost.AutoSize = m_blPopupAutoSize;
TextBox textBox = new TextBox();
textBox.TextChanged+=new EventHandler(textBox_TextChanged);
textBox.KeyDown+=new KeyEventHandler(textBox_KeyDown);
textBoxHost = new ToolStripControlHost(textBox);
textBoxHost.AutoSize =false ;
dropDown = new ToolStripDropDown();
dropDown.Width = this.Width;
dropDown.Items.Add(textBoxHost);
dropDown.Items.Add(dataGridViewHost);
}
#endregion
public string GetDataProperty(string sColumn)
{
string sValue = "";
if (DataView != null)
{
if (DataGridView.Columns.Contains(sColumn))
{
sValue = DataView[m_SelectedIndex][sColumn].ToString();
}
}
return sValue;
}
public void dataGridView_DoubleClick(object sender, EventArgs e)
{
PopupGridView(e);
}
/// <summary>
/// 弹出下拉表格并触发选择后事件
/// </summary>
/// <param name="e"></param>
private void PopupGridView(EventArgs e)
{
if (DataGridView.SelectedRows.Count > 0)
{
DataGridViewRow dgvRow = DataGridView.CurrentRow;
m_SelectedIndex = DataGridView.CurrentRow.Index;
if (m_sDisplayMember != String.Empty)
{
Text = "";
string[] sDisplayList = m_sDisplayMember.Split(',');
foreach (string sDisplay in sDisplayList)
{
if (DataGridView.Columns.Contains(sDisplay))
{
Text += dgvRow.Cells[sDisplay].Value.ToString() + m_Separator;
}
}
Text = Text.TrimEnd('|');
}
else
{
Text = dgvRow.Cells[0].Value.ToString();
}
if (AfterSelector != null)
{
AfterSelector(this,e);
}
}
dropDown.Close();
m_blDropShow=false;
}
private DataTable GetDataTableFromDataSource()
{
object dataSource = DataGridView.DataSource;
return GetDataTableFromDataSource(dataSource);
}
/// <summary>
/// 从DataGridView 获取数据表
/// </summary>
/// <returns></returns>
private DataTable GetDataTableFromDataSource(object dataSource)
{
if (dataSource is DataTable)
{
return (DataTable)dataSource;
}
else if (dataSource is DataView)
{
return ((DataView)dataSource).Table;
}
else if (dataSource is BindingSource)
{
object bind = ((BindingSource)dataSource).DataSource;
if (bind is DataTable)
{
return (DataTable)bind;
}
else
{
return ((DataView)bind).Table;
}
}
else
{
return null;
}
}
private void ShowDropDown()
{
if (dropDown != null)
{
if (DataView != null)
{
DataView.RowFilter = "";
TextBox.Text = "";
textBoxHost.Width = 200;
dataGridViewHost.AutoSize = m_blPopupAutoSize;
dataGridViewHost.Size = new Size(DropDownWidth - 2, DropDownHeight);
dropDown.Show(this, 0, this.Height);
}
}
}
private void dataGridView_KeyDown(object sender,KeyEventArgs e)
{
if (e.KeyData == Keys.Enter)
{
PopupGridView(e);
}
}
#region 重写方法
private string GetRowFilterString(string sText)
{
string sFilter = "";
if (m_sDisplayMember == String.Empty || m_sDisplayMember == null)
{
m_sDisplayMember = DataView.Table.Columns[0].ColumnName;
}
if (m_sKeyWords == String.Empty)
{
m_sKeyWords = m_sDisplayMember;
}
string[] sColumns = m_sKeyWords.Split(',');
foreach (string sColumn in sColumns)
{
sFilter += sColumn + " like " + "'%" + sText + "%'"+" or ";
}
sFilter=sFilter.Trim().TrimEnd("or".ToCharArray());
return sFilter;
}
private void textBox_TextChanged(object sender,System.EventArgs e)
{
DataView.RowFilter = GetRowFilterString(TextBox.Text);
}
private void textBox_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyData == Keys.Enter)
{
PopupGridView(e);
}
}
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
if (e.KeyData == Keys.Enter)
{
DataView.RowFilter = GetRowFilterString(Text);
PopupGridView(null);
}
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_LBUTTONDBLCLK || m.Msg == WM_LBUTTONDOWN)
{
if (m_blDropShow)
{
m_blDropShow = false;
}
else
{
m_blDropShow = true;
}
if (m_blDropShow)
{
ShowDropDown();
}
else
{
dropDown.Close();
}
return;
}
base.WndProc(ref m);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (dropDown != null)
{
dropDown.Dispose();
dropDown = null;
}
}
base.Dispose(disposing);
}
#endregion
#endregion
}
}