菲佣WPF——5(Convert瞎想)

Convert在WPF页面显示中，使用比较多。

今天就来瞎想下Convert

 

1.先来个最常用的 bool 转 Visible

XAML代码:

 

<Window x:Class="WpfApplication4.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:local="clr-namespace:WpfApplication4"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:BoolVisible x:Key="converter"/>
    </Window.Resources>
    <Grid>
        <Button x:Name="btnDemo" Width="100" Height="50" Visibility="{Binding IsVisible,Converter={StaticResource ResourceKey=converter}}" Command="{Binding ClickCommand}"/>
    </Grid>
</Window>

ViewModel代码：

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;

namespace WpfApplication4
{
    public class MainWindowsViewModel:NotifyObject
    {
        #region << Property >>
        public bool IsVisible
        {
            get { return GET(() => IsVisible); }
            set { SET(() => IsVisible, value); }
        }

        public ICommand ClickCommand { get; set; }
        #endregion
        #region << Constructor >>
        public MainWindowsViewModel()
        {
            IsVisible = true;
            ClickCommand = new DeletegateCommand(Click);
        }
        #endregion

        #region << Method >>
        public void Click()
        {
            IsVisible = false;           
        }
        #endregion

    }
}

Converter的实现代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;

namespace WpfApplication4
{
    public class BoolVisible:IValueConverter
    {
        #region << Method >>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            bool visible = (bool)value;

            if (visible != null)
                return visible ? "Visible" : "Hidden";
            else
                return "Hidden";
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return null;
        }
        #endregion
    }
}