参考链接：

WPF-15：AutoCompleteBox的使用(实现下拉列表)
WPF: AutoCompleteBox, an autocomplete text box
如果出现未能加载程序集，可以参照这篇回答

准备：

WpfToolKit.dll,System.Windows.Controls.Input.Toolkit.dll下载或通过nuget搜索安装，下载链接在第一个博客中

内容：

前端

通过wpftool框架实现自动补全信息或智能选择的功能
在前端添加
xmlns:toolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit"
在窗口内实现AutoCompleteBox

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<toolkit:AutoCompleteBox x:Name="searchTextBox" Grid.Row="1" ValueMemberPath="SerchString" Margin="10" FontSize="20" Height="50" IsTextCompletionEnabled="True" Foreground="Black">
                <toolkit:AutoCompleteBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Margin="5,5" FontSize="26">
                            <Run Text="{Binding SerchString}" Foreground="Blue"/>
                            <Run Text="{Binding Name}" Foreground="Gray"/>
                        </TextBlock>
                    </DataTemplate>
                </toolkit:AutoCompleteBox.ItemTemplate>
                
            </toolkit:AutoCompleteBox>

后端

实现MVVM，实现INotPropertyChanged接口，并创建事件将内容进行绑定，因为是实现代码，与第一个博客中内容基本一直，但是博客中本身的MessageBox会引发进程错误，这一块并没有搞懂，因为不u影响功能的实现，所以将语句注释掉了

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public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.searchTextBox.Populating += new PopulatingEventHandler(AutoCompleteBox_Populating);
            this.searchTextBox.SelectionChanged += new SelectionChangedEventHandler(SearchTextBox_selectionChanged);
            
        }
        void SearchTextBox_selectionChanged(object seder,SelectionChangedEventArgs e)
        {
            AutoCompleteModel model = this.searchTextBox.SelectedItem as AutoCompleteModel;
            //if (model != null)
            //{
            //    MessageBox.Show(model.Name);
            //}
        }
        private void AutoCompleteBox_Populating(object sender,PopulatingEventArgs e)
        {
            e.Cancel = true;
            List<AutoCompleteModel> data = new List<AutoCompleteModel>();
            for(int i = 0; i < 10; i++)
            {
                AutoCompleteModel model = new AutoCompleteModel();
                model.SerchString = "0"+ i.ToString();
                model.Name = "测试" + i;
                data.Add(model);
            }
            this.searchTextBox.ItemsSource = data;
            this.searchTextBox.FilterMode = AutoCompleteFilterMode.Contains;
            this.searchTextBox.PopulateComplete();
        }
        public class AutoCompleteModel : INotifyPropertyChanged
        {
            public void OnProperrtChanged(string proname)
            {
                if (this.PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs(proname));
            }
            public event PropertyChangedEventHandler PropertyChanged;

            private string searchString = string.Empty;
            private string name = string.Empty;

            public string SerchString
            {
                get { return searchString; }
                set
                {
                    searchString = value;
                    this.OnProperrtChanged("SearchString");
                }
            }

            public string Name
            {
                get { return name; }
                set
                {
                    name = value;
                    this.OnProperrtChanged("Name");
                }
            }
        }
    }