wpf 中的自动完成框焦点

在WPF中，自动完成框（AutoCompleteBox）是一种常用的控件，它能够为用户提供输入建议，并根据用户的输入进行自动完成。这是一个非常方便的功能，可以提升用户的体验和效率。本文将介绍如何使用WPF中的自动完成框，并提供一个案例代码来演示其基本用法。

xaml
                 Width="200" 
                 Height="30" 
                 Margin="10" 
                 ItemsSource="{Binding Suggestions}" 
                 Text="{Binding InputText, Mode=TwoWay}" 
                 MinimumPrefixLength="1" 
                 IsTextCompletionEnabled="True"/>

csharp
public class AutoCompleteViewModel : INotifyPropertyChanged
{
    private ObservableCollection _suggestions;
    private string _inputText;
    public ObservableCollection Suggestions
    {
        get { return _suggestions; }
        set
        {
            _suggestions = value;
            OnPropertyChanged(nameof(Suggestions));
        }
    }
    public string InputText
    {
        get { return _inputText; }
        set
        {
            _inputText = value;
            OnPropertyChanged(nameof(InputText));
        }
    }
    public AutoCompleteViewModel()
    {
        Suggestions = new ObservableCollection
        {
            "Apple",
            "Banana",
            "Cherry",
            "Durian",
            "Elderberry"
        };
    }
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

xaml
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:AutoCompleteBoxExample"
        Title="AutoCompleteBox Example" Height="450" Width="800">
    
        
    
    
        
            
            
            
                                               Text="{Binding InputText, Mode=TwoWay}" MinimumPrefixLength="1" 
                                   IsTextCompletionEnabled="True"/>