Question

我想创建一个新的用户控件，它显示我自己的组合框。（Combobox有自己的风格和其他东西......（稍后会出现））

usercontrol xaml文件：

<UserControl x:Class="WpfApplication1.MyCombobox"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d" d:DesignWidth="500"
             Height="50">

    <ComboBox Height="42" ItemsSource="{Binding Path=MyItems}"></ComboBox>

</UserControl>

文件后面的用户控制代码：

namespace WpfApplication1
{
    public partial class MyCombobox
    {
        public MyCombobox()
        {
            InitializeComponent();

            MyItems = new List<ComboBoxItem>();
        }

        public List<ComboBoxItem> MyItems { get; set; }
    }
}

mainwindow xaml文件：

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:WpfApplication1="clr-namespace:WpfApplication1" WindowStartupLocation="CenterScreen"
        Height="350"
        Width="500"
        >
    <Grid>
        <WpfApplication1:MyCombobox>
            <WpfApplication1:MyCombobox.MyItems>
                <ComboBoxItem Height="36">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="30"/>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>
                        <Grid Grid.Column="1">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="16" />
                                <RowDefinition Height="16" />
                            </Grid.RowDefinitions>
                            <TextBlock Text="Item Title 1" Grid.Row="0" FontWeight="Bold" />
                            <TextBlock Text="Item Description 1" Grid.Row="1" FontStyle="Italic" />
                        </Grid>
                    </Grid>
                </ComboBoxItem>
                <ComboBoxItem Height="36">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="30"/>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>
                        <Grid Grid.Column="1">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="16" />
                                <RowDefinition Height="16" />
                            </Grid.RowDefinitions>
                            <TextBlock Text="Item Title 2" Grid.Row="0" FontWeight="Bold" />
                            <TextBlock Text="Item Description 2" Grid.Row="1" FontStyle="Italic" />
                        </Grid>
                    </Grid>
                </ComboBoxItem>
            </WpfApplication1:MyCombobox.MyItems>
        </WpfApplication1:MyCombobox>
    </Grid>
</Window>

我希望我可以在主窗口中将组合文件添加到我的usercontrol中。像那样：

<WpfApplication1:MyCombobox.MyItems>
    <ComboBoxItem Height="36">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="30"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Grid Grid.Column="1">
                <Grid.RowDefinitions>
                    <RowDefinition Height="16" />
                    <RowDefinition Height="16" />
                </Grid.RowDefinitions>
                <TextBlock Text="Item Title 2" Grid.Row="0" FontWeight="Bold" />
                <TextBlock Text="Item Description 2" Grid.Row="1" FontStyle="Italic" />
            </Grid>
        </Grid>
    </ComboBoxItem>
    <!-- more items... -->
</WpfApplication1:MyCombobox.MyItems>

UserControl组合框使用了在主窗口中传递的项目。

当我运行代码时，它只显示一个空的组合框

怎么了？

Answer 1

这与您在Combobox中创建MyItems绑定的方式有关。

要使其正确定位代码隐藏中的MyItems属性，您可以执行以下操作：

public MyCombobox() 
{ 
    InitializeComponent(); 

    MyItems = new List<ComboBoxItem>(); 
    this.DataContext = this;
}

创建一个Combobox用户控件并从主窗口传递项目

1 个答案: