wpf学习之(IValueConverter)

发布时间:2017-7-1 11:17:55编辑:www.fx114.net 分享查询网我要评论
本篇文章主要介绍了"wpf学习之(IValueConverter) ",主要涉及到wpf学习之(IValueConverter) 方面的内容,对于wpf学习之(IValueConverter) 感兴趣的同学可以参考一下。

 

学习IValueConverter的使用


public class StatuToNullableBoolConverter : IValueConverter { /// <summary> /// 将Statu转换为bool? /// </summary> public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { State s = (State)value; switch (s) { case State.Available: return true; case State.Locked: return false; case State.Unknown: default: return null; } } /// <summary> /// 将bool?转换为Statu /// </summary> public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { bool? nb = (bool)value; switch (nb) { case true: return State.Available; case false: return State.Locked; default: return State.Unknown; } } }
 
 
class CategoryToSourceConverter : IValueConverter    {        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            Category c = (Category)value;            switch (c)            {                case Category.Bomber:                    return @"\Icon\sys_ct_icon\chardevice.ico";                case Category.Fighter:                    return @"\Icon\sys_ct_icon\file_broken.ico";                default:                    return null;            }        }        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            throw new NotImplementedException();        }    }
 
 
<Window x:Class="WpfApplication1.WindowConvertListItem"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        xmlns:local="clr-namespace:WpfApplication1.DXSL.BLL"        Title="WindowConvertListItem" Height="300" Width="300">    <Window.Resources>        <local:CategoryToSourceConverter x:Key="cts" />        <local:StatuToNullableBoolConverter x:Key="ctnb" />    </Window.Resources>    <Grid>        <StackPanel Background="LightBlue">            <ListBox x:Name="listboxPlane" Height="160" Margin="5,5" >                <ListBox.ItemTemplate>                    <DataTemplate>                        <StackPanel Orientation="Horizontal">                            <Image Width="20" Height="20" Source="{Binding Path=Category,Converter={StaticResource cts}}" />                            <TextBlock Text="{Binding Path=Name}" Width="60" Margin="80,0" />                            <CheckBox IsThreeState="True" IsChecked="{Binding Path= Statu, Converter={StaticResource ctnb}}" />                        </StackPanel>                    </DataTemplate>                </ListBox.ItemTemplate>            </ListBox>            <Button x:Name="btnLoad" Content="load" Height="25" Margin="5,5" Click="btnLoad_Click" />            <Button x:Name="btnSave" Content="save" Height="25" Margin="5,5" Click="btnSave_Click" />        </StackPanel>    </Grid></Window>
 
 
/// <summary>    /// WindowConvertListItem.xaml 的交互逻辑    /// </summary>    public partial class WindowConvertListItem : Window    {        public WindowConvertListItem()        {            InitializeComponent();        }        private void btnLoad_Click(object sender, RoutedEventArgs e)        {            List<Plane> list = new List<Plane>()             {                 new Plane (){Category =Category.Bomber,Name="b_1", State =State.Unknown},                new Plane (){Category =Category.Bomber,Name="b_2",State =State.Available},                new Plane (){Category =Category.Fighter,Name="b_3",State =State.Locked},                new Plane (){Category =Category.Fighter,Name="b_4", State =State.Available}            };            this.listboxPlane.ItemsSource = list;        }        private void btnSave_Click(object sender, RoutedEventArgs e)        {            StringBuilder str = new StringBuilder();                       foreach (Plane item in this.listboxPlane.Items)            {                str.AppendLine(string.Format("{0},{1},{2}", item.Category, item.Name, item.State));            }            System.IO.File.WriteAllText("plane.csv", str.ToString());        }


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