using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
private List<string> listNames = new List<string>();
private int dropDownHeight = 0;
private string txt = "";
public Form1()
{
InitializeComponent();
this.comboBox1.Items.Add("ganquanfu");
this.comboBox1.Items.Add("quanfu");
this.comboBox1.Items.Add("ligang");
this.comboBox1.Items.Add("zhaojialong");
this.comboBox1.Items.Add("zhaozhen");
this.comboBox1.Items.Add("ganquanfu");
this.comboBox1.Items.Add("quanfu");
this.comboBox1.Items.Add("ligang");
this.comboBox1.Items.Add("zhaojialong");
this.comboBox1.Items.Add("zhaozhen");
this.comboBox1.Items.Add("ganquanfu");
this.comboBox1.Items.Add("quanfu");
this.comboBox1.Items.Add("ligang");
this.comboBox1.Items.Add("zhaojialong");
this.comboBox1.Items.Add("zhaozhen");
foreach (var item in comboBox1.Items)
{
listNames.Add(item.ToString());
}
dropDownHeight = comboBox1.ItemHeight * (listNames.Count + 1);
comboBox1.DropDownHeight = dropDownHeight;
comboBox1.DropDownStyle = ComboBoxStyle.DropDown;
// comboBox1.Refresh();
// comboBox1.SelectedIndexChanged+=new EventHandler(comboBox1_SelectedIndexChanged);
//设置DropDown的高度
// this.comboBox1.DropDownHeight = 100;
// 以下是事件处理函数的另一种写法，Lambda表达式书写
// this.comboBox1.DropDown += new EventHandler(comboBox1_DropDown);
this.comboBox1.TextUpdate += new EventHandler(comboBox1_TextUpdate);
// this.comboBox1.TextChanged += new EventHandler(comboBox1_TextChanged);
//this.comboBox1.DropDown += (a, b) => {
// if (a is ComboBox)
// {
// ComboBox sender = a as ComboBox;
// MessageBox.Show(sender.Items[0].ToString());
// }
// };
// this.comboBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
// this.comboBox1.DropDownClosed += new EventHandler(comboBox1_DropDownClosed);
// this.comboBox1.Click += new EventHandler(comboBox1_Click);
// this.comboBox1.SelectedIndexChanged += new EventHandler(comboBox1_SelectedIndexChanged);
// this.comboBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
// this.comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;
}
void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
// MessageBox.Show("Test");
// this.comboBox1.Items.Clear();
// this.comboBox1.Items.AddRange(listNames.Where(t => t.Contains(comboBox1.Text)).ToArray());
}
//void comboBox1_TextChanged(object sender, EventArgs e)
//{
// MessageBox.Show("Changed");
//}
void comboBox1_TextUpdate(object sender, EventArgs e)
{
//MessageBox.Show("update");
this.Cursor = Cursors.Arrow;
dropDownHeight = 0;
string search = comboBox1.Text.Trim();
if (string.IsNullOrWhiteSpace(search))
{
comboBox1.Items.Clear();
comboBox1.BeginUpdate();
comboBox1.Items.AddRange(listNames.ToArray());
comboBox1.EndUpdate();
dropDownHeight = comboBox1.ItemHeight * ((listNames.Count) + 1);
comboBox1.DropDownHeight = dropDownHeight;
comboBox1.IntegralHeight = true;
// comboBox1.Refresh();
// comboBox1.SelectedIndex = -1;
comboBox1.DroppedDown = true;
this.Cursor = Cursors.Arrow;
return;
}
var results = listNames.Where(t => t.Contains(search)).ToArray();
if (results.Count() > 0)
{
comboBox1.Items.Clear();
comboBox1.BeginUpdate();
foreach (var item in results)
{
comboBox1.Items.Add(item);
}
comboBox1.EndUpdate();
dropDownHeight = comboBox1.ItemHeight * (results.Count() + 1);
comboBox1.DropDownHeight = dropDownHeight;
// comboBox1.SelectedIndex = -1;
comboBox1.DroppedDown = true;
comboBox1.IntegralHeight = true;
this.Cursor = Cursors.Arrow;
comboBox1.SelectionStart = search.Length;
}
else
{
// comboBox1.Items.Clear();
comboBox1.DropDownHeight = 1;
//comboBox1.DroppedDown = false;
}
this.Cursor = Cursors.Arrow;
// this.Cursor = this.DefaultCursor;
//comboBox1.DropDownHeight = dropDownHeight;
}
void comboBox1_Click(object sender, EventArgs e)
{
MessageBox.Show("Test");
comboBox1.Text = "ganquanfu";
}
void comboBox1_TextChanged(object sender, EventArgs e)
{
this.Cursor = Cursors.Arrow;
dropDownHeight = 0;
string search = comboBox1.Text.Trim();
if (string.IsNullOrWhiteSpace(search))
{
comboBox1.Items.Clear();
comboBox1.Items.AddRange(listNames.ToArray());
dropDownHeight = comboBox1.ItemHeight * (listNames.Count + 1);
comboBox1.DropDownHeight = dropDownHeight;
// comboBox1.Refresh();
comboBox1.DroppedDown = true;
this.Cursor = Cursors.Arrow;
return;
}
var results = listNames.Where(t => t.Contains(search)).ToArray();
if (results.Count() > 0)
{
comboBox1.Items.Clear();
foreach (var item in results)
{
comboBox1.Items.Add(item);
}
dropDownHeight = comboBox1.ItemHeight * (results.Count() + 1);
comboBox1.DropDownHeight = dropDownHeight;
// comboBox1.Refresh();
comboBox1.DroppedDown = true;
this.Cursor = Cursors.Arrow;
comboBox1.SelectionStart = search.Length;
}
else
{
// comboBox1.Items.Clear();
comboBox1.DropDownHeight = 1;
comboBox1.DroppedDown = false;
}
this.Cursor = Cursors.Arrow;
}
void comboBox1_DropDownClosed(object sender, EventArgs e)
{
MessageBox.Show(this.comboBox1.DroppedDown.ToString());
}
void comboBox1_DropDown(object sender, EventArgs e)
{
// comboBox1.Items.AddRange(listNames);
this.comboBox1.Items.Clear();
this.comboBox1.Items.AddRange(listNames.Where(t => t.Contains(comboBox1.Text)).ToArray());
MessageBox.Show("update");
this.Cursor = Cursors.Arrow;
dropDownHeight = 0;
string search = comboBox1.Text.Trim();
if (string.IsNullOrWhiteSpace(search))
{
comboBox1.Items.Clear();
comboBox1.Items.AddRange(listNames.ToArray());
dropDownHeight = comboBox1.ItemHeight * (listNames.Count + 1);
comboBox1.DropDownHeight = dropDownHeight;
comboBox1.Refresh();
comboBox1.DroppedDown = true;
this.Cursor = Cursors.Arrow;
return;
}
var results = listNames.Where(t => t.Contains(search)).ToArray();
if (results.Count() > 0)
{
comboBox1.Items.Clear();
foreach (var item in results)
{
comboBox1.Items.Add(item);
}
dropDownHeight = comboBox1.ItemHeight * (results.Count() + 1);
comboBox1.DropDownHeight = dropDownHeight;
comboBox1.Refresh();
comboBox1.DroppedDown = true;
this.Cursor = Cursors.Arrow;
comboBox1.SelectionStart = search.Length;
}
else
{
comboBox1.Items.Clear();
comboBox1.DropDownHeight = 1;
comboBox1.DroppedDown = false;
}
this.Cursor = Cursors.Arrow;
comboBox1.DropDownHeight = dropDownHeight;
}
private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show(this.comboBox1.DroppedDown.ToString());
this.comboBox1.DroppedDown = true;
}
private void Form1_Load(object sender, EventArgs e)
{
this.Cursor = System.Windows.Forms.Cursors.Cross;
}
private void button1_Click_1(object sender, EventArgs e)
{
People<string> pString = new People<string>();
pString.Show("ganquanfu");
People<int> pInt = new People<int>();
pInt.Show(200);
}
}
class People<r>
{
public void Show(r @object)
{
MessageBox.Show(@object.ToString());
}
}
}
