使用 WPF C# 中的多个控件组合创建自定义控件

Create a Custom Control with the combination of multiple controls in WPF C#

我想创建一个自定义控件,它应该是预定义控件的组合,如文本框、按钮、列表框等,

请参考以下控件(只是示例)

<Grid.RowDefinitions>
    <RowDefinition Height="30" />
    <RowDefinition Height="50" />
</Grid.RowDefinitions>
<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="300" />
        <ColumnDefinition Width="100" />
    </Grid.ColumnDefinitions>
    <TextBox Grid.Column="0" />
    <Button Grid.Column="1" Content="Add" Margin="20,0" />
</Grid>
<ListBox ItemsSource="{Binding textBox}" Grid.Row="1" Margin="0,25">
    <ListBoxItem />
</ListBox>
</Grid>

我需要在单个自定义控件中组合控件。我需要在按下按钮时在 ListItem 中添加文本框值,最后我需要来自此控件的列表。

预期的自定义控件(只是一个示例)

<cust:MultiControl ItemsSource="{Binding stringCollection}" />

描述: 我需要从用户那里获取字符串列表。我添加了一个 TextBox 来获取用户的输入。我添加了一个按钮以在 List<string> 中添加文本。为了显示列表,我添加了一个 ListBox。

我需要一个Single控件,它应该继承这三个控件。因为我需要一个 ItemsSource 用于 双向绑定 。如果更新了 List<string>,它应该更新 ItemSource。

我在超过 15 个地方使用了这个结构。所以,我希望将其作为自定义控件。请帮助我如何将其实现为单个控件?

我不需要用户控件,我需要自定义控件,请帮助我...

即使 ItemsSource 具有值,Item Source ViewModel 集合也不会更新。

假设这是您的自定义控件:

<UserControl x:Class="CustomControl.UserControl1"
         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" 
         xmlns:local="clr-namespace:CustomControl"
         mc:Ignorable="d" >
<StackPanel Width="200" Margin="15">
    <TextBox  Name="txtbox"/>
    <Button  Content="Add"
            Margin="20,0"  Click="Button_Click"/>

    <ListBox ItemsSource="{Binding}"
             Margin="0,25">
    </ListBox>

</StackPanel>

这是你的父级window调用你的自定义控件:

<Window x:Class="ParentControl.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:ParentControl"
    mc:Ignorable="d"
    xmlns:customcontrol="clr-namespace:CustomControl;assembly=CustomControl"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <customcontrol:UserControl1 Name="customcontrol"></customcontrol:UserControl1>
</Grid>

你有一个字符串集合,你想用文本框中的文本更新它,你可以这样做: 在父级window中将自定义控件的DataContext设置为字符串集合,像这样:

        public MainWindow()
    {
        InitializeComponent();

        ObservableCollection<string> stringcollection = new ObservableCollection<string>();
        stringcollection.Add("String 1");
        stringcollection.Add("String 2");
        stringcollection.Add("String 2");
        stringcollection.Add("String 3");
        customcontrol.DataContext = stringcollection;

    }

并在您的自定义控件后台逻辑中将处理程序添加到按钮单击事件并执行如下操作:

 private void Button_Click(object sender, RoutedEventArgs e)
    {
        var button = sender as Button;
        var list = button.DataContext as ObservableCollection<string>;
        list.Add(this.txtbox.Text.ToString());
    }

确保字符串集合是 Type Observable Collection,否则每次单击添加按钮时列表框都不会更新。

希望对您有所帮助。

我已经为您提供了所需 CustomControl 的最小示例。

控件

public class MyCustomControl : ItemsControl {

        static MyCustomControl() {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(MyCustomControl), new FrameworkPropertyMetadata(typeof(MyCustomControl)));
        }

        private Button _addButton;
        private TextBox _textBox;
        private ListView _itemsView;

        public override void OnApplyTemplate() {
            this._addButton = this.GetTemplateChild("PART_AddButton") as Button;
            this._textBox = this.GetTemplateChild("PART_TextBox") as TextBox;
            this._itemsView = this.GetTemplateChild("PART_ListBox") as ListView;

            this._addButton.Click += (sender, args) => {
                (this.ItemsSource as IList<string>).Add(this._textBox.Text);
            };
            this._itemsView.ItemsSource = this.ItemsSource;
            base.OnApplyTemplate();
        }

        public ICommand DeleteCommand => new RelayCommand(x => { (this.ItemsSource as IList<string>).Remove((string)x); });
    }

模板

 <Style TargetType="{x:Type local:MyCustomControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:MyCustomControl}">
                <Border Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="Auto" />
                        </Grid.RowDefinitions>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="300" />
                                <ColumnDefinition Width="100" />
                            </Grid.ColumnDefinitions>
                            <TextBox x:Name="PART_TextBox" Grid.Column="0" />
                            <Button x:Name="PART_AddButton" Grid.Column="1" Content="Add" Margin="20,0" />
                        </Grid>
                        <ListView ItemsSource="{TemplateBinding ItemsSource}" Grid.Row="1" Margin="0,25" x:Name="PART_ListBox" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
                            <ListView.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Stretch">
                                        <TextBlock Text="{Binding}"/>
                                        <Button Content="X" Foreground="Red" 
                                                Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:MyCustomControl}}, Path=DeleteCommand}" 
                                                CommandParameter="{Binding}" Margin="10,0,0,0"></Button>
                                    </StackPanel>
                                </DataTemplate>
                            </ListView.ItemTemplate>
                        </ListView>
                    </Grid>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

中继命令

public class RelayCommand : ICommand
    {
        #region Fields

        private readonly Action<object> _execute;
        private readonly Predicate<object> _canExecute;

        #endregion // Fields

        #region Constructors

        public RelayCommand(Action<object> execute, Predicate<object> canExecute = null)
        {
            if (execute == null)
                throw new ArgumentNullException(nameof(execute));

            this._execute = execute;
            this._canExecute = canExecute;
        }

        #endregion // Constructors

        #region ICommand Members

        [DebuggerStepThrough]
        public bool CanExecute(object parameter)
        {
            return this._canExecute == null || this._canExecute(parameter);
        }

        public event EventHandler CanExecuteChanged {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }

        public void Execute(object parameter)
        {
            this._execute(parameter);
        }

        #endregion // ICommand Members
    }

用法

 <local:MyCustomControl ItemsSource="{Binding Collection}"/>

备注 不要使用 List 作为 ItemsSource。而是使用 ObservableCollection,因为它会自动通知 View,您不必处理那个 Update-Stuff

干杯