wpf ComboBox 绑定命令

StevenChen85

于 2025-04-23 20:54:55 发布

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分类专栏： WPF 文章标签： wpf

本文链接：https://blog.csdn.net/cjh16606260986/article/details/147463050

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在WPF中为ComboBox绑定命令通常涉及ICommand接口的实现及XAML中事件与命令的关联。以下是具体实现方式：

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"

注意用 2010的版本

命令绑定和参数

         <ComboBox Grid.Row="0" x:Name="cboFormulaList" Width="100" Height="25" FontSize="15" Margin="5,10,0,6" HorizontalAlignment="Left" VerticalAlignment="Center" 
             ItemsSource="{Binding FormulaList}"
             DisplayMemberPath="Name"
             SelectedValuePath="Id"
             SelectedItem="{Binding FormulaSelect, Mode=TwoWay}"
             >
             <i:Interaction.Triggers>
                 <i:EventTrigger EventName="SelectionChanged">
                     <i:InvokeCommandAction Command="{Binding FormulaSelectionChangedCommand}"   
CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ComboBox}}"/>
                 </i:EventTrigger>
             </i:Interaction.Triggers>
         </ComboBox>

ViewModel

/// <summary>
/// 选择 配方
/// </summary>
public RelayCommand<object> FormulaSelectionChangedCommand
{
    get
    {
        return new RelayCommand<object>((arg) =>
        {
            //var content = arg.Content.ToString();
            //var id = arg;
            if (arg is ComboBox)
            {
                var val = (arg as ComboBox).SelectedValue;
                FormulaSelect = FormulaList.First(t => t.Id == val.ToInt());
                if (FormulaSelect != null)
                {
                    SearchModel.FormulaId = FormulaSelect.Id;
                }
                this.Query();
            }
        });
    }
}