WPF桌面端开发1-常用组件之ComboBox

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WPF桌面端开发1-常用组件之ComboBox

ComboBox

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<ComboBox
          x:Name="ip_cb"
          Height="auto"
          Margin="0,0,0,0"
          Padding="10,0,0,0"
          VerticalContentAlignment="Center"
          Cursor="Hand"
          DisplayMemberPath="Value"
          FontSize="14"
          SelectedValuePath="Key"
          SelectionChanged="ip_cb_SelectionChanged"
          Style="{StaticResource ComboBoxStyle}" />

数据绑定

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var addressList = ZConfig.ipaddressList();
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("Key", typeof(string)));
dt.Columns.Add(new DataColumn("Value", typeof(string)));

for (int i = 0; i < addressList.Count; i++)
{
  dt.Rows.Add(addressList[i], addressList[i]);
}

ip_cb.ItemsSource = dt.DefaultView;
if (addressList.Count > 0)
{
  ip_cb.SelectedIndex = 0;
}

注意

ip_cb.SelectedIndex = 0;会触发回调。

选中回调

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private void ip_cb_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
  if (ip_cb.SelectedValue != null)
  {
    var localIP = ip_cb.SelectedValue.ToString();
  }
}

获取到的是SelectedValuePath对应的值

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//保存的ID
ZCommonData.classid = Convert.ToInt32(cmbClass.SelectedValue.ToString());
//显示的名称
ZCommonData.classname = cmbClass.Text;

绑定自定义对象

绑定ComboBox的显示文本和实际值，可以使用DisplayMemberPath和SelectedValuePath属性来实现。

首先，假设你的数据模型类Item包含Name作为显示文本和Value作为实际值：

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public class Item
{
    public string Name { get; set; }
    public int Value { get; set; }
}

然后，在XAML中，你需要指定DisplayMemberPath用于显示文本和SelectedValuePath用于实际值，并绑定SelectedValue属性：

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<Window x:Class="ComboBoxBinding.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:ComboBoxBinding"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <ComboBox x:Name="comboBox"
                  DisplayMemberPath="Name"
                  SelectedValuePath="Value"
                  SelectedValue="{Binding SelectedItemId, Mode=TwoWay}">
        </ComboBox>
    </Grid>
</Window>

在C#中设置数据源：

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public partial class MainWindow : Window
{
    public ObservableCollection<Item> Items { get; set; }
    
    private int _selectedItemId;
    public int SelectedItemId
    {
        get { return _selectedItemId; }
        set
        {
            _selectedItemId = value;
            // Do something when selected item changes
        }
    }

    public MainWindow()
    {
        InitializeComponent();

        Items = new ObservableCollection<Item>
        {
            new Item { Name = "Item 1", Value = 1 },
            new Item { Name = "Item 2", Value = 2 },
            new Item { Name = "Item 3", Value = 3 }
        };

        comboBox.ItemsSource = Items;
        // Optionally, set the initial selected item
        SelectedItemId = Items[0].Value;
    }
}

在这个示例中，Items集合作为ComboBox的数据源，SelectedItemId用来绑定ComboBox选中项的实际值。

这样ComboBox就会显示Name属性作为每个选项的文本，并且可以通过SelectedValue获取选中项的实际值。

定义样式

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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <!--  ComBoBox项鼠标经过背景色  -->
    <SolidColorBrush x:Key="ComboBoxMouseOverBackground" Color="#f0f0f0" />
    <!--  Combox右侧下拉按钮  -->
    <Style x:Key="ComboxStyleBtn" TargetType="ToggleButton">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate>
                    <!--  下拉按钮内部背景色  -->
                    <Border
                        x:Name="Back"
                        Background="Transparent"
                        BorderBrush="Transparent"
                        BorderThickness="1"
                        CornerRadius="4">
                        <!--  下拉按钮内边框  -->

                        <Image
                            Name="PathFill"
                            Height="12"
                            Margin="0,0,10,0"
                            HorizontalAlignment="Right"
                            VerticalAlignment="Center"
                            Source="/Images/UserCenter/jiantou.png" />

                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="Back" Property="Background" Value="Transparent" />
                            <Setter TargetName="Back" Property="BorderBrush" Value="Transparent" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <!--  Combox  -->
    <Style x:Key="ComboBoxStyle" TargetType="ComboBox">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ComboBox">
                    <Grid>
                        <!--  文字区域背景和边线样式  -->
                        <TextBox
                            Grid.Column="0"
                            Padding="10,0,0,0"
                            VerticalAlignment="Center"
                            Background="Transparent"
                            BorderBrush="#c0c0c0"
                            BorderThickness="0"
                            Foreground="Black"
                            IsReadOnly="{TemplateBinding IsReadOnly}"
                            Text="{TemplateBinding Text}" />

                        <!--  右侧下拉button设置  -->
                        <Border BorderThickness="0">
                            <ToggleButton
                                BorderBrush="Black"
                                BorderThickness="3"
                                ClickMode="Press"
                                IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                Style="{StaticResource ComboxStyleBtn}" />
                        </Border>
                        <!--  弹出popup整体设置  -->
                        <Popup
                            x:Name="Popup"
                            AllowsTransparency="True"
                            Focusable="False"
                            IsOpen="{TemplateBinding IsDropDownOpen}"
                            Placement="Bottom"
                            PopupAnimation="Slide">
                            <Grid
                                x:Name="DropDown"
                                Width="{TemplateBinding ActualWidth}"
                                MaxHeight="200"
                                SnapsToDevicePixels="True">
                                <Border
                                    x:Name="DropDownBorder"
                                    BorderBrush="#e8e8e8"
                                    BorderThickness="1,0,1,1" />
                                <ScrollViewer
                                    Margin="1"
                                    CanContentScroll="True"
                                    HorizontalScrollBarVisibility="Disabled"
                                    SnapsToDevicePixels="True"
                                    VerticalScrollBarVisibility="Auto">
                                    <!--  StackPanel 用于显示子级，方法是将 IsItemsHost 设置为 True  -->
                                    <StackPanel
                                        Background="White"
                                        IsItemsHost="True"
                                        KeyboardNavigation.DirectionalNavigation="Contained" />
                                </ScrollViewer>
                            </Grid>
                        </Popup>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <!--  ComBoxItem  -->
                <Style TargetType="{x:Type ComboBoxItem}">
                    <Setter Property="MinHeight" Value="32" />
                    <Setter Property="MinWidth" Value="60" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ComboBoxItem}">
                                <Border
                                    Name="_back"
                                    Background="Transparent"
                                    BorderBrush="#f3f3f3"
                                    BorderThickness="0"
                                    CornerRadius="4">
                                    <ContentPresenter Margin="10,0,10,0" VerticalAlignment="Center" />
                                </Border>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsMouseOver" Value="True">
                                        <Setter TargetName="_back" Property="Background" Value="{StaticResource ComboBoxMouseOverBackground}" />
                                    </Trigger>
                                    <!--  下拉框背景色  -->
                                    <Trigger Property="IsHighlighted" Value="True">
                                        <Setter TargetName="_back" Property="Background" Value="{StaticResource ComboBoxMouseOverBackground}" />
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

使用

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<ComboBox Style="{StaticResource ComboBoxStyle}"
          Width="200"
          ItemsSource="{Binding TimeOpts}"
          Height="36">
</ComboBox>