c#模仿百度關鍵詞提示

標籤：c#   關鍵字提示   

1：from表單環境：TextBox(關鍵詞文字框)、ListBox(提示框)

2：實現思路：

   2.1：以輸入的關鍵詞為條件查詢  資料庫（在查詢中以點擊率排序就加一個order by 點擊率 desc）返回多行單列資料結果集合。再一一賦值到listBox中顯示。

   2.2：在TextBox中如果偵聽鍵盤

            if(Down（小鍵盤向下）)

                  則先擷取到ListBox選中的索引，如果返回-1 或者x+1的值大於ListBox.count()   則初始值=0; 否則為ListBox索引值為x+1

          else (Up(小鍵盤向上))

               則先擷取到ListBox選中的索引，如果返回-1 或者x-1的值< 0      則初始值=ListBox.count() ; 否則為ListBox索引值為x-1;

3：表單代碼如下

using System;using System.Collections.Generic;using System.Drawing;using System.Windows.Forms;using System.Threading;using System.IO;using System.IO.Ports;using System.Text.RegularExpressions;using System.Text;/// <summary>///     <author>hubiao</author>///<date>2014-07-30</date>/// </summary>namespace ee{/// <summary>/// Description of MainForm./// </summary>public partial class MainForm : Form{private List<String> dataBuffer = new List<String>();public MainForm(){InitializeComponent();//程式與from表單分離執行Control.CheckForIllegalCrossThreadCalls = false;}void Button1Click(object sender, System.EventArgs e){textBox1.Text = String.Empty;}//這裡可以從資料庫初始化值void MainFormLoad(object sender, EventArgs e){dataBuffer.Add("心態");dataBuffer.Add("信心");dataBuffer.Add("能核心");dataBuffer.Add("醉心能");dataBuffer.Add("linuax");dataBuffer.Add("linuax改變IT世界");dataBuffer.Add("java");dataBuffer.Add("java是點亮星星之火");dataBuffer.Add("linaux改變IT世界");dataBuffer.Add("java");dataBuffer.Add("java是星星");dataBuffer.Add("湖北省");dataBuffer.Add("湖北跨省");dataBuffer.Add("湖北武漢");dataBuffer.Add("鹹寧也是湖北的");dataBuffer.Add("這是核桃");dataBuffer.Add("通城屬於鹹寧的");dataBuffer.Add("今天是星期幾？");//先隱藏！listBox1.Hide();}//檢索出值bool isFjty = false;void TextBox2TextChanged(object sender, EventArgs e){TextBox tb = sender as TextBox;if(isFjty)return;String outStr = tb.Text;if(outStr==""){listBox1.Hide();return;}elselistBox1.Show();listBox1.Items.Clear();foreach(String db in dataBuffer){/*方案1：包含提示  if(db.IndexOf(outStr)!=-1){listBox1.Items.Add(db);}*//*方案2：從前向後匹配if(db.StartsWith(outStr)){listBox1.Items.Add(db);}*/}int count = listBox1.Items.Count;if(count > 0)listBox1.Height = (count+1)*13;elseTextBox2Leave(null,null);}Keys keys;void ListBox1KeyDown(object sender, KeyEventArgs e){keys = e.KeyCode;textBox1.AppendText("key="+keys);}void TextBox2KeyUp(object sender, KeyEventArgs e){Keys keys = e.KeyCode;textBox1.Text = keys.ToString();if(keys.ToString()=="Down" && listBox1.Items.Count > 0){isFjty = true;int x = listBox1.SelectedIndex;x = x==-1?0:x+1;if(x > listBox1.Items.Count-1)x = 0;listBox1.SelectedIndex = x;textBox2.Text = listBox1.Items[x].ToString();textBox2.SelectionStart = textBox2.Text.Length+1;}else if(keys.ToString()=="Up" && listBox1.Items.Count > 0){isFjty = true;int x = listBox1.SelectedIndex;int len = listBox1.Items.Count-1;x = x==-1?len:x-1;if(x < 0)x = len;listBox1.SelectedIndex = x;textBox2.Text = listBox1.Items[x].ToString();textBox2.SelectionStart = textBox2.Text.Length+1;}else{isFjty = false;}}/*按下鍵時，如果不是上下移動，則立即偵聽輸入的字元*/void TextBox2KeyDown(object sender, KeyEventArgs e){if(keys.ToString()!="Down" || keys.ToString()!="Up"){isFjty = false;}}/*滑鼠手動選擇*/void ListBox1Click(object sender, EventArgs e){textBox2.Text = listBox1.Items[listBox1.SelectedIndex].ToString();textBox2.SelectionStart = textBox2.Text.Length+1;textBox2.Focus();//手動選擇後，是否應該隱藏掉提示列表呢？//TextBox2Leave(null,null);}//關鍵輸入框失去焦點後就【隱藏提示列表】。void TextBox2Leave(object sender, EventArgs e){listBox1.Items.Clear();listBox1.Height = 0;listBox1.Hide();}}}

4：樣本圖

|--從前向後匹配

 

|--模糊比對