在WPF中自动完成Combobox [英] Autocomplete Combobox in WPF

问题描述

在尝试自动完成一个文本框后，盖伊试图自动完成组合框。因为我无法将所有控件添加到文本框中。但是在组合框中，我做到了。但是问题也就在那里。当我输入组合框时它是弹出窗口很好地根据键入的文本过滤项目，但我需要通过鼠标选择一个选项，不能通过键盘箭头。我试图解决它与keydown事件但不知何故它不能集中组合框我认为。有人可以建议我在这里有什么不对我我在做什么或如何启用键盘arrowkey事件？以下是我的代码：



XML：

 <   ComboBox    高度  =  23    Horizo​​ntalAlignment   = 左   保证金  =   160,236,0,0   名称  =  comboBox1   < span class =code-attribute> VerticalAlignment   =  Top   宽度  =  120    IsEditable   =  True    ItemsSource   =  {Binding}    KeyDown   =  comboBox1_KeyDown >  
 <   ComboBox。资源 >  
 <   sys：Double     x：Key   =   {x：Static SystemParameters.VerticalScrollBarWidthKey} >  0 <   / sys：Double  >  
 < span class =code-keyword><   / ComboBox.Resources  >  
 <   / ComboBox  >  

C＃：

公共部分类MainWindow：Window 
 {
 List< string>名单; 
 
 public MainWindow（）
 {
 InitializeComponent（）; 
 nameList = new List< string> 
 {
A0-Word，B0-Word，C0-Word，
A1-Word，A111，A11122，B1-Word ，C1-Word，
B2-Word，C2-Word，
C3-Word，
}; 
 
 comboBox1.DataContext = nameList; 
 
 comboBox1.Loaded + =委托
 {
 System.Windows.Controls.TextBox textBox = comboBox1.Template.FindName（PART_EditableTextBox，comboBox1）as System.Windows.Controls 。文本框; 
 Popup popup = comboBox1.Template.FindName（PART_Popup，comboBox1）为Popup; 
 if（textBox！= null）
 {
 textBox.TextChanged + = delegate 
 {
 comboBox1.Items.Filter + =（item）=> 
 {
 if（item.ToString（）。StartsWith（textBox.Text））
 {
 popup.IsOpen = true; 
返回true; 
 
} 
 else 
 {
 // popup.IsOpen = false; 
返回false; 
} 
}; 
 
}; 
} 
}; 
 
 comboBox1.KeyDown + = new System.Windows.Input.KeyEventHandler（comboBox1_KeyDown）; 
 
} 
 
 private void comboBox1_KeyDown（object sender，System.Windows.Input.KeyEventArgs e）
 {
 
 if（e。 Key == Key.Down）
 {
 e.Handled = true; 
 comboBox1.Items.MoveCurrentToNext（）; 
} 
} 

解决方案

仅供参考，WPF Toolkit（）中有一个很好的自动完成文本框。为什么不使用它？

Guy's after trying to autocomplete a textbox i move towards now to an autocomplete combobox.Because i cannot add all controls to a textbox.But in combobox,i did that.But a problem also stands there.When i type in combobox it's popup filters the items according to typed text nicely,but i need to select a option by mouse,cannot by keyboard arrow's.I tried to solve it with keydown event but somehow it cannot focus combobox i think.Someone can suggest me here what wrong i am doing or how can i enable keyboard arrowkey events?Below are my codes:

XML:

<ComboBox Height="23" HorizontalAlignment="Left" Margin="160,236,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120" IsEditable="True" ItemsSource="{Binding}" KeyDown="comboBox1_KeyDown">
    <ComboBox.Resources>
        <sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">0</sys:Double>
    </ComboBox.Resources>
</ComboBox>

C#:

    public partial class MainWindow : Window
    {
        List<string> nameList;
        
        public MainWindow()
        {
            InitializeComponent();
            nameList = new List<string> 
            {
                "A0-Word","B0-Word","C0-Word",
                "A1-Word","A111","A11122","B1-Word","C1-Word",
                "B2-Word","C2-Word",
                "C3-Word",
            };

           comboBox1.DataContext = nameList;

            comboBox1.Loaded += delegate
            {
                System.Windows.Controls.TextBox textBox = comboBox1.Template.FindName("PART_EditableTextBox", comboBox1) as System.Windows.Controls.TextBox;
                Popup popup = comboBox1.Template.FindName("PART_Popup", comboBox1) as Popup;
                if (textBox != null)
                {
                    textBox.TextChanged += delegate
                    {
                            comboBox1.Items.Filter += (item) =>
                            {
                                if (item.ToString().StartsWith(textBox.Text))
                                {
                                    popup.IsOpen = true;
                                    return true;
                                    
                                }
                                else
                                {
                                   // popup.IsOpen = false;
                                    return false;
                                }
                            };

                    };
                }
            };

            comboBox1.KeyDown+=new System.Windows.Input.KeyEventHandler(comboBox1_KeyDown);
            
        }

private void comboBox1_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{

    if (e.Key == Key.Down)
    {
        e.Handled = true;
        comboBox1.Items.MoveCurrentToNext();
    }
}

解决方案

FYI, there is nice auto-complete text box in WPF Toolkit (). Why don`t you use it?

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