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  • WPF命令参数CommandParameter

    XAML代码如下:

    <Window x:Class="Demo006.MainWindow"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            Title="MainWindow" Height="240" Width="360" WindowStyle="ToolWindow">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="24" />
                <RowDefinition Height="4" />
                <RowDefinition Height="24" />
                <RowDefinition Height="4" />
                <RowDefinition Height="24" />
                <RowDefinition Height="4" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <TextBlock  Grid.Row="0" Text="Name:" VerticalAlignment="Center" HorizontalAlignment="Left" />
            <TextBox Grid.Row="0" Name="NameTextBox" Margin="60,0,0,0" />
            <Button Grid.Row="2" Content="New Teacher" Command="New" CommandParameter="Teacher" />
            <Button Grid.Row="4" Content="New Student" Command="New" CommandParameter="Student" />
            <ListBox Grid.Row="6" Name="NewItemListBox" Height="117" VerticalAlignment="Bottom" />
        </Grid>
        <Window.CommandBindings>
            <CommandBinding Command="New"
                            CanExecute="CommandBinding_CanExecute" 
                            Executed="CommandBinding_Executed" />
        </Window.CommandBindings>
    </Window>
    

    相关的事件处理器代码如下所示:

    private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(this.NameTextBox.Text) == true) e.CanExecute = false;
        else e.CanExecute = true;
    }
    
    private void CommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
    {
        string name = this.NameTextBox.Text;
        if (e.Parameter.ToString() == "Teacher")
        {
            this.NewItemListBox.Items.Add(string.Format("New Teacher: {0}, 学而不厌,诲人不倦。", name));
        }
        else if (e.Parameter.ToString() == "Student")
        {
            this.NewItemListBox.Items.Add(string.Format("New Student: {0},好好学习,天天向上。", name));
        }
    }
    

      

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  • 原文地址:https://www.cnblogs.com/GJYSK/p/4036379.html
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