实现一个和Winform一样的NumericUpDown控件

可以使用 WPF 中的自定义控件来实现类似 WinForm 中的 NumericUpDown 控件。下面是一个简单的实现：

首先，创建一个新的 UserControl，命名为 NumericUpDown。在 UserControl 中添加两个 Button 控件，一个 TextBox 控件和一个 Label 控件，如下所示：

<UserControl x:Class="WpfApp1.NumericUpDown"
             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"
             mc:Ignorable="d"
             d:DesignHeight="30" d:DesignWidth="120">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        <TextBox x:Name="TextBox" Grid.Column="0" />
        <Grid Grid.Column="1">
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <Button x:Name="UpButton" Grid.Row="0" Content="▲" Click="UpButton_Click" />
            <Button x:Name="DownButton" Grid.Row="1" Content="▼" Click="DownButton_Click" />
        </Grid>
        <Label x:Name="Label" Content="Label" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,-20,0,0" />
    </Grid>
</UserControl>

然后，在 NumericUpDown.xaml.cs 文件中添加以下代码：

public partial class NumericUpDown : UserControl
{
    public NumericUpDown()
    {
        InitializeComponent();
    }

    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(double), typeof(NumericUpDown), new FrameworkPropertyMetadata(0.0, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, ValueChangedCallback));
    public static readonly DependencyProperty MinimumProperty = DependencyProperty.Register("Minimum", typeof(double), typeof(NumericUpDown), new PropertyMetadata(double.MinValue));
    public static readonly DependencyProperty MaximumProperty = DependencyProperty.Register("Maximum", typeof(double), typeof(NumericUpDown), new PropertyMetadata(double.MaxValue));

    public double Value
    {
        get { return (double)GetValue(ValueProperty); }
        set { SetValue(ValueProperty, value); }
    }

    public double Minimum
    {
        get { return (double)GetValue(MinimumProperty); }
        set { SetValue(MinimumProperty, value); }
    }

    public double Maximum
    {
        get { return (double)GetValue(MaximumProperty); }
        set { SetValue(MaximumProperty, value); }
    }

    private static void ValueChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var numericUpDown = d as NumericUpDown;
        if (numericUpDown != null)
        {
            numericUpDown.TextBox.Text = e.NewValue.ToString();
        }
    }

    private void UpButton_Click(object sender, RoutedEventArgs e)
    {
        var newValue = Value + 1.0;
        if (newValue <= Maximum)
        {
            Value = newValue;
        }
    }

    private void DownButton_Click(object sender, RoutedEventArgs e)
    {
        var newValue = Value - 1.0;
        if (newValue >= Minimum)
        {
            Value = newValue;
        }
    }
}

这里我们创建了 Value、Minimum 和 Maximum 三个依赖属性，分别表示当前值、最小值和最大值。当 Value 属性改变时，我们将文本框中的值更新为新值。当 UpButton 或 DownButton 被单击时，我们检查新值是否在最小值和最大值之间。如果是，则更新 Value 属性。最后，可以在 MainWindow.xaml 中使用 NumericUpDown 控件：

<StackPanel>
    <Label>Value:</Label>
    <local:NumericUpDown Value="0" Minimum="-10" Maximum="10" />
</StackPanel>