c# – 使用转换器将Window Title绑定到属性

概述我正在尝试绑定窗口标题属性,以便它显示对象的文件名和修改状态.文件名和修改后的状态都是对象的依赖属性. 我知道我可能只是在对象中添加一个“WindowTitle”属性,但这看起来相当hacky.我已经创建了一个非常精简的版本,我正在尝试做的事情. 这是XAML： <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schem @H_301_1@我正在尝试绑定窗口标题属性,以便它显示对象的文件名和修改状态.文件名和修改后的状态都是对象的依赖属性.

我知道我可能只是在对象中添加一个“WindowTitle”属性,但这看起来相当Hacky.我已经创建了一个非常精简的版本,我正在尝试做的事情.

这是XAML：

<Window x:Class="WpfApplication1.MainWindow"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    xmlns:local="clr-namespace:WpfApplication1"    title="{Binding Converter={StaticResource windowTitleConverter}}" Height="195" WIDth="245"><Window.Resources>    <local:WindowTitleConverter x:Key="windowTitleConverter"/></Window.Resources><GrID Height="150" WIDth="217">    <TextBox Height="23" HorizontalAlignment="left" margin="12,12,0" name="textBox1" VerticalAlignment="top" WIDth="120" Text="{Binding filename}" />    <CheckBox Content="ModifIEd" Height="16" HorizontalAlignment="left" margin="12,41,0" name="checkBox1" VerticalAlignment="top" IsChecked="{Binding ModifIEd}" /></GrID>

和守则：

using System;using System.Globalization;using System.Text;using System.windows;using System.windows.Controls;using System.windows.Data;namespace WpfApplication1{    public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();            DataContext = new Foo();        }    }    public class Foo : DependencyObject    {        public string filename        {            get { return (string)GetValue(filenameProperty); }            set { SetValue(filenameProperty,value); }        }        public static Readonly DependencyProperty filenameProperty =            DependencyProperty.Register("filename",typeof(string),typeof(Foo),new UIPropertyMetadata());        public bool ModifIEd        {            get { return (bool)GetValue(ModifIEdProperty); }            set { SetValue(ModifIEdProperty,value); }        }        public static Readonly DependencyProperty ModifIEdProperty =            DependencyProperty.Register("ModifIEd",typeof(bool),new UIPropertyMetadata(0));    }    public class WindowTitleConverter : IValueConverter    {        public object Convert(object value,Type targettype,object parameter,CultureInfo culture)        {            Foo foo = (Foo)value;            if (foo == null || foo.filename == null)                return "Foo";            return foo.filename + (foo.ModifIEd ? " *" : "");        }        public object ConvertBack(object value,CultureInfo culture)        {            throw new NotSupportedException();        }    }}

解决方法 如果你移动资源下面的标题绑定它将工作.我不确定为什么声明的顺序在这里很重要,但它似乎对我来说是个错误

<Window x:Class="WpfApplication1.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        xmlns:local="clr-namespace:WpfApplication1"        Height="195" WIDth="245">    <Window.Resources>        <local:WindowTitleConverter x:Key="windowTitleConverter"/>    </Window.Resources>    <Window.Title>        <Binding Converter="{StaticResource windowTitleConverter}"/>    </Window.Title>    <!--...--></Window>

更新

您现在遇到的问题是因为Dependency Property ModifIEd具有错误的默认值类型.它是bool类型,你将它设置为0,所以将其更改为false,它应该工作

public static Readonly DependencyProperty ModifIEdProperty =    DependencyProperty.Register("ModifIEd",new UIPropertyMetadata(false));

更新

在直接绑定到DataContext时,我不知道有任何方法可以引发PropertyChanged.您可以使用的一个小解决方法是绑定到一个名为This的属性,它只返回它

<Window.Title>    <Binding Path="This" Converter="{StaticResource windowTitleConverter}"/></Window.Title>

然后,您可以使用PropertyChangedCallback为此引发PropertyChanged

public class Foo : DependencyObject,INotifyPropertyChanged{    public Object This    {        get { return this; }    }    public bool ModifIEd    {        get { return (bool)GetValue(ModifIEdProperty); }        set { SetValue(ModifIEdProperty,value); }    }    public string filename    {        get { return (string)GetValue(filenameProperty); }        set { SetValue(filenameProperty,value); }    }    public static Readonly DependencyProperty filenameProperty =        DependencyProperty.Register("filename",new UIPropertyMetadata(string.Empty,new PropertyChangedCallback(OnfilenameChanged)));    public static Readonly DependencyProperty ModifIEdProperty =        DependencyProperty.Register("ModifIEd",new UIPropertyMetadata(false,new PropertyChangedCallback(OnModifIEdChanged)));    private static voID OnfilenameChanged(DependencyObject obj,DependencyPropertyChangedEventArgs e)    {        Foo foo = obj as Foo;        foo.OnPropertyChanged("This");    }    private static voID OnModifIEdChanged(DependencyObject obj,DependencyPropertyChangedEventArgs e)    {        Foo foo = obj as Foo;        foo.OnPropertyChanged("This");    }    public event PropertyChangedEventHandler PropertyChanged;    public voID OnPropertyChanged(string propertyname)    {        if (PropertyChanged != null)        {            PropertyChanged(this,new PropertyChangedEventArgs(propertyname));        }    }}

另一种解决方案是使用MultiBinding,这样就不需要使用This属性了

<Window.Resources>    <local:TitleMultiConverter x:Key="TitleMultiConverter"/></Window.Resources><Window.Title>    <MultiBinding Converter="{StaticResource TitleMultiConverter}">        <Binding Path="filename"/>        <Binding Path="ModifIEd"/>    </MultiBinding></Window.Title>

TitleMultiConverter

public class TitleMultiConverter : IMultiValueConverter{    public object Convert(object[] values,CultureInfo culture)    {        string filename = values[0].ToString();        bool modifIEd = (bool)values[1];        if (filename == null)            return "Foo";        return filename + (modifIEd ? " *" : "");    }    public object[] ConvertBack(object value,Type[] targettypes,CultureInfo culture)    {        throw new NotImplementedException();    }}

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