C# WPF 小坑

我的XAML代码

<Grid x:Name="mainGrid" IsEnabled="False" MouseDown="TextBlock_MouseClick1">
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <TextBlock Grid.Column="0" Grid.Row="0" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="1" Grid.Row="0" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="2" Grid.Row="0" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="3" Grid.Row="0" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="0" Grid.Row="1" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="1" Grid.Row="1" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="2" Grid.Row="1" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="3" Grid.Row="1" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="0" Grid.Row="2" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="1" Grid.Row="2" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="2" Grid.Row="2" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="3" Grid.Row="2" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="0" Grid.Row="3" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="1" Grid.Row="3" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="2" Grid.Row="3" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
        <TextBlock Grid.Column="3" Grid.Row="3" HorizontalAlignment="Center" TextWrapping="Wrap" Text="?" VerticalAlignment="Center" FontSize="36" MouseDown="TextBlock_MouseClick1"/>
    </Grid>

我的C#代码

private void TextBlock_MouseClick1(object sender, MouseButtonEventArgs e)
{
    MessageBox.Show("MouseDown");
}

点击时不显示MessageBox

调了很久

最后注意到 IsEnabled="False"，改成 True 就好了（坑死我了）