wpf autocomplate textbox 智能提示

因数据来自 google，所以 需要你在测试时 能够访问google的网址
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel;using System.Collections;using System.Web;using System.Xml;using System.Net;using System.Diagnostics;namespace Test{ public class ViewModel : INotifyPropertyChanged { private List<string> _WaitMessage = new List<string>() { "Please Wait..." }; public IEnumerable WaitMessage { get { return _WaitMessage; } } private string _QueryText; public string QueryText { get { return _QueryText; } set { if (_QueryText != value) { _QueryText = value; OnPropertyChanged("QueryText"); _QueryCollection = null; OnPropertyChanged("QueryCollection"); Debug.Print("QueryText: " value); } } } public IEnumerable _QueryCollection = null; public IEnumerable QueryCollection { get { Debug.Print("---" _QueryCollection); QueryGoogle(QueryText); return _QueryCollection; } } private void QueryGoogle(string SearchTerm) { Debug.Print("Query: " SearchTerm); string sanitized = HttpUtility.HtmlEncode(SearchTerm); string url = @"http://google.com/complete/search?output=toolbar&q=" sanitized; WebRequest httpWebRequest = HttpWebRequest.Create(url); var webResponse = httpWebRequest.GetResponse(); XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(webResponse.GetResponseStream()); var result = xmlDoc.SelectNodes("//CompleteSuggestion"); _QueryCollection = result; } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion protected void OnPropertyChanged(string prop) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(prop)); } }}