C# IValueConverter-使用源和转换器在同一绑定/同一控件中的源和转换器

我有一组组合框和文本框，如下所示：

class ViewModel : INotifyPropertyChanged
{
    // The actual time. Similar to the "timeAll" field you have in the code now
    // Should be kept in UTC
    private DateTime _time;

    // The three selected TimeZoneInfo values for the combo boxes
    private TimeZoneInfo _timeZone1;
    private TimeZoneInfo _timeZone2;
    private TimeZoneInfo _timeZone3;

    public DateTime Time
    {
        get { return _time; }
        set { UpdateValue(ref _time, value); }
    }

    public TimeZoneInfo TimeZone1
    {
        get { return _timeZone1; }
        set { UpdateValue(ref _timeZone1, value); }
    }

    public TimeZoneInfo TimeZone2
    {
        get { return _timeZone2; }
        set { UpdateValue(ref _timeZone2, value); }
    }

    public TimeZoneInfo TimeZone3
    {
        get { return _timeZone3; }
        set { UpdateValue(ref _timeZone3, value); }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void UpdateValue<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
    {
        if (!object.Equals(field, value))
        {
            field = value;
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}

class TimeConverter : IMultiValueConverter
{
    public string Format { get; set; }

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        DateTime utc = (DateTime)values[0];
        TimeZoneInfo tzi = (TimeZoneInfo)values[1];

        return tzi != null ? TimeZoneInfo.ConvertTime(utc, tzi).ToString(Format) : Binding.DoNothing;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        string timeText = (string)value;
        DateTime time;

        if (!DateTime.TryParseExact(timeText, Format, null, DateTimeStyles.None, out time))
        {
            return new object[] { Binding.DoNothing, Binding.DoNothing };
        }

        ComboBox comboBox = (ComboBox)parameter;
        TimeZoneInfo tzi = (TimeZoneInfo)comboBox.SelectedValue;

        return new object[] { TimeZoneInfo.ConvertTime(time, tzi, TimeZoneInfo.Utc), Binding.DoNothing };
    }
}

C1T1

C2T2

C3T3

我实现了一个IValueConverter来在C1中设置时区，并在T1中获得相应的时间。其他几对也一样

我想做的是：如果用户手动更改T1中的时间，则T2和T3中的时间必须根据T1以及时区进行更改

T1不是参考。如果任何文本框的值已更改，则所有其他文本框也必须更改

这种变化可能发生在：

如果在组合框中更改了时区

如果用户通过在文本框中键入来手动更改时间

这是我的完整代码：

 public partial class MainWindow : Window 
{
    public static int num;
    public static bool isUserInteraction;
    public static DateTime timeAll;
    public MainWindow()
    {
        InitializeComponent();
        this.DataContext = this;
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        ReadOnlyCollection<TimeZoneInfo> TimeZones = TimeZoneInfo.GetSystemTimeZones();

        this.DataContext = TimeZones;

        cmb_TZ1.SelectedIndex = 98;
        cmb_TZ2.SelectedIndex = 46;
        cmb_TZ3.SelectedIndex = 84;
        cmb_TZ4.SelectedIndex = 105;
        cmb_TZ5.SelectedIndex = 12;
    }

    private void ComboBox_Selection(object Sender, SelectionChangedEventArgs e)
         {
        var cmbBox = Sender as ComboBox;

        DateTime currTime = DateTime.UtcNow;
        TimeZoneInfo tst = (TimeZoneInfo)cmbBox.SelectedItem;
        if (isUserInteraction)
        {
           /*  txt_Ctry1.Text=
              txt_Ctry2.Text =
              txt_Ctry3.Text =
              txt_Ctry4.Text =
              txt_Ctry5.Text =*/
            isUserInteraction = false;
        }
    }

  private void TextBox_Type(object Sender, TextChangedEventArgs e)
   {
     var txtBox = Sender as TextBox;

        if (isUserInteraction)
        {
            timeAll = DateTime.Parse(txtBox.Text); 
            if (txtBox.Name != "txt_Ctry1")
             txt_Ctry1.Text=
                       if (txtBox.Name != "txt_Ctry2")
                txt_Ctry2.Text =
                       if (txtBox.Name != "txt_Ctry3")
                txt_Ctry3.Text =
                       if (txtBox.Name != "txt_Ctry4")
                txt_Ctry4.Text =
                       if (txtBox.Name != "txt_Ctry5")
                txt_Ctry5.Text =
            isUserInteraction = false;
        }
    }


    private void OnPreviewMouseDown(object sender, MouseButtonEventArgs e)
    {
        isUserInteraction = true;
    }
}
public class TimeZoneConverter : IValueConverter
{
    public object Convert(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (MainWindow.isUserInteraction == false)
        {
            return value == null ? string.Empty : TimeZoneInfo
                .ConvertTime(DateTime.UtcNow, TimeZoneInfo.Utc, (TimeZoneInfo)value)
                .ToString("HH:mm:ss dd MMM yy");
        }
 else
        {
            return value == null ? string.Empty : TimeZoneInfo
           .ConvertTime(MainWindow.timeAll, TimeZoneInfo.Utc, (TimeZoneInfo)value)
           .ToString("HH:mm:ss dd MMM yy");
        }

             }

    public object ConvertBack(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

   <Window x:Class="Basic_WorldClock.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:src="clr-namespace:System;assembly=mscorlib"
    xmlns:sys="clr-namespace:System;assembly=System.Core"
    xmlns:local="clr-namespace:Basic_WorldClock"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">

  <Window.Resources>
  <ObjectDataProvider x:Key="timezone" ObjectType="{x:Type     
   sys:TimeZoneInfo}" MethodName="GetSystemTimeZones">
  </ObjectDataProvider>
      <local:TimeZoneConverter x:Key="timezoneconverter"/>
   </Window.Resources>

   <Grid Margin="0,0.909,0,-0.909">

    <TextBox x:Name="txt_Time1" Text="{Binding ElementName=cmb_TZ1, Path=SelectedValue, Converter={StaticResource timezoneconverter}}" VerticalAlignment="Top"/>
    <TextBox x:Name="txt_Time2"  Text="{Binding ElementName=cmb_TZ2, Path=SelectedValue, Converter={StaticResource timezoneconverter}}" VerticalAlignment="Top"/>
    <TextBox x:Name="txt_Time3" Text="{Binding ElementName=cmb_TZ3, Path=SelectedValue, Converter={StaticResource timezoneconverter}}" Height="23.637" VerticalAlignment="Bottom"/>

    <ComboBox x:Name="cmb_TZ1" SelectionChanged="ComboBox_Selection" PreviewMouseDown="OnPreviewMouseDown" ItemsSource="{Binding Source={StaticResource timezone}}" HorizontalAlignment="Right" Height="22.667" Margin="0,89.091,51.667,0" VerticalAlignment="Top" Width="144.666"/>
    <ComboBox x:Name="cmb_TZ2" SelectionChanged="ComboBox_Selection" PreviewMouseDown="OnPreviewMouseDown" ItemsSource="{Binding Source={StaticResource timezone}}" HorizontalAlignment="Right" Height="22.667" Margin="0,131.091,52.667,0" VerticalAlignment="Top" Width="144.666"/>
    <ComboBox x:Name="cmb_TZ3" SelectionChanged="ComboBox_Selection" PreviewMouseDown="OnPreviewMouseDown" ItemsSource="{Binding Source={StaticResource timezone}}" HorizontalAlignment="Right" Height="22.667" Margin="0,0,48.334,123.575" VerticalAlignment="Bottom" Width="144.666"/>


</Grid>

公共部分类主窗口：窗口
{
公共静态整数；
公共静态bool-isUserInteraction；
公共静态日期时间所有；
公共主窗口（）
{
初始化组件（）；
this.DataContext=this；
}
已加载私有无效窗口（对象发送器、路由目标）
{
ReadOnlyCollection TimeZones=TimeZoneInfo.GetSystemTimeZones（）；
this.DataContext=时区；
cmb_TZ1.SelectedIndex=98；
cmb_TZ2.SelectedIndex=46；
cmb_TZ3.SelectedIndex=84；
cmb_TZ4.SelectedIndex=105；
cmb_TZ5.SelectedIndex=12；
}
私有无效组合框\u选择（对象发送方，SelectionChangedEventArgs e）
{
var cmbBox=发送方作为组合框；
DateTime currTime=DateTime.UtcNow；
TimeZoneInfo tst=（TimeZoneInfo）cmbBox.SelectedItem；
if（isUserInteraction）
{
/*txt_Ctry1.Text=
txt_Ctry2.Text=
txt_Ctry3.Text=
txt_Ctry4.Text=
txt_Ctry5.Text=*/
isUserInteraction=false；
}
}
私有无效文本框_类型（对象发送方，TextChangedEventArgs e）
{
var txtBox=发送方作为文本框；
if（isUserInteraction）
{
timeAll=DateTime.Parse（txtBox.Text）；
如果（txtBox.Name！=“txt_Ctry1”）
txt_Ctry1.Text=
如果（txtBox.Name！=“txt_Ctry2”）
txt_Ctry2.Text=
如果（txtBox.Name！=“txt_Ctry3”）
txt_Ctry3.Text=
如果（txtBox.Name！=“txt_Ctry4”）
txt_Ctry4.Text=
如果（txtBox.Name！=“txt_Ctry5”）
txt_Ctry5.Text=
isUserInteraction=false；
}
}
私有void OnPreviewMouseDown（对象发送器，鼠标按钮ventargs e）
{
isUserInteraction=true；
}
}
公共类时区转换器：IValueConverter
{
公共对象转换(
对象值、类型targetType、对象参数、CultureInfo区域性）
{
if（MainWindow.isUserInteraction==false）
{
返回值==null？字符串。空：TimeZoneInfo
.ConvertTime（DateTime.UtcNow，TimeZoneInfo.Utc，（TimeZoneInfo）值）
.ToString（“HH:mm:ss dd MMM yy”）；
}
其他的
{
返回值==null？字符串。空：TimeZoneInfo
.ConvertTime（MainWindow.timeAll、TimeZoneInfo.Utc、（TimeZoneInfo）值）
.ToString（“HH:mm:ss dd MMM yy”）；
}
}
公共对象转换回(
对象值、类型targetType、对象参数、CultureInfo区域性）
{
抛出新的NotSupportedException（）；
}
}

}

XAML:

 public partial class MainWindow : Window 
{
    public static int num;
    public static bool isUserInteraction;
    public static DateTime timeAll;
    public MainWindow()
    {
        InitializeComponent();
        this.DataContext = this;
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        ReadOnlyCollection<TimeZoneInfo> TimeZones = TimeZoneInfo.GetSystemTimeZones();

        this.DataContext = TimeZones;

        cmb_TZ1.SelectedIndex = 98;
        cmb_TZ2.SelectedIndex = 46;
        cmb_TZ3.SelectedIndex = 84;
        cmb_TZ4.SelectedIndex = 105;
        cmb_TZ5.SelectedIndex = 12;
    }

    private void ComboBox_Selection(object Sender, SelectionChangedEventArgs e)
         {
        var cmbBox = Sender as ComboBox;

        DateTime currTime = DateTime.UtcNow;
        TimeZoneInfo tst = (TimeZoneInfo)cmbBox.SelectedItem;
        if (isUserInteraction)
        {
           /*  txt_Ctry1.Text=
              txt_Ctry2.Text =
              txt_Ctry3.Text =
              txt_Ctry4.Text =
              txt_Ctry5.Text =*/
            isUserInteraction = false;
        }
    }

  private void TextBox_Type(object Sender, TextChangedEventArgs e)
   {
     var txtBox = Sender as TextBox;

        if (isUserInteraction)
        {
            timeAll = DateTime.Parse(txtBox.Text); 
            if (txtBox.Name != "txt_Ctry1")
             txt_Ctry1.Text=
                       if (txtBox.Name != "txt_Ctry2")
                txt_Ctry2.Text =
                       if (txtBox.Name != "txt_Ctry3")
                txt_Ctry3.Text =
                       if (txtBox.Name != "txt_Ctry4")
                txt_Ctry4.Text =
                       if (txtBox.Name != "txt_Ctry5")
                txt_Ctry5.Text =
            isUserInteraction = false;
        }
    }


    private void OnPreviewMouseDown(object sender, MouseButtonEventArgs e)
    {
        isUserInteraction = true;
    }
}
public class TimeZoneConverter : IValueConverter
{
    public object Convert(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (MainWindow.isUserInteraction == false)
        {
            return value == null ? string.Empty : TimeZoneInfo
                .ConvertTime(DateTime.UtcNow, TimeZoneInfo.Utc, (TimeZoneInfo)value)
                .ToString("HH:mm:ss dd MMM yy");
        }
 else
        {
            return value == null ? string.Empty : TimeZoneInfo
           .ConvertTime(MainWindow.timeAll, TimeZoneInfo.Utc, (TimeZoneInfo)value)
           .ToString("HH:mm:ss dd MMM yy");
        }

             }

    public object ConvertBack(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

   <Window x:Class="Basic_WorldClock.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:src="clr-namespace:System;assembly=mscorlib"
    xmlns:sys="clr-namespace:System;assembly=System.Core"
    xmlns:local="clr-namespace:Basic_WorldClock"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">

  <Window.Resources>
  <ObjectDataProvider x:Key="timezone" ObjectType="{x:Type     
   sys:TimeZoneInfo}" MethodName="GetSystemTimeZones">
  </ObjectDataProvider>
      <local:TimeZoneConverter x:Key="timezoneconverter"/>
   </Window.Resources>

   <Grid Margin="0,0.909,0,-0.909">

    <TextBox x:Name="txt_Time1" Text="{Binding ElementName=cmb_TZ1, Path=SelectedValue, Converter={StaticResource timezoneconverter}}" VerticalAlignment="Top"/>
    <TextBox x:Name="txt_Time2"  Text="{Binding ElementName=cmb_TZ2, Path=SelectedValue, Converter={StaticResource timezoneconverter}}" VerticalAlignment="Top"/>
    <TextBox x:Name="txt_Time3" Text="{Binding ElementName=cmb_TZ3, Path=SelectedValue, Converter={StaticResource timezoneconverter}}" Height="23.637" VerticalAlignment="Bottom"/>

    <ComboBox x:Name="cmb_TZ1" SelectionChanged="ComboBox_Selection" PreviewMouseDown="OnPreviewMouseDown" ItemsSource="{Binding Source={StaticResource timezone}}" HorizontalAlignment="Right" Height="22.667" Margin="0,89.091,51.667,0" VerticalAlignment="Top" Width="144.666"/>
    <ComboBox x:Name="cmb_TZ2" SelectionChanged="ComboBox_Selection" PreviewMouseDown="OnPreviewMouseDown" ItemsSource="{Binding Source={StaticResource timezone}}" HorizontalAlignment="Right" Height="22.667" Margin="0,131.091,52.667,0" VerticalAlignment="Top" Width="144.666"/>
    <ComboBox x:Name="cmb_TZ3" SelectionChanged="ComboBox_Selection" PreviewMouseDown="OnPreviewMouseDown" ItemsSource="{Binding Source={StaticResource timezone}}" HorizontalAlignment="Right" Height="22.667" Margin="0,0,48.334,123.575" VerticalAlignment="Bottom" Width="144.666"/>


</Grid>

问题：如何像combox一样使用Convert方法将相应的更改级联到其他文本框？ 我可以使用TextChanged方法捕获引用文本框中的更改，并且可以添加几行代码来进行这些更改，但是我想使用IValueConverter。我可以将源代码和转换器放在文本框的同一个绑定中吗？

如果没有一个好的文件来清楚地显示您到目前为止所获得的内容，就很难提供准确的信息。但是根据您所描述的，这里的主要问题似乎是您没有使用WPF设计用于的基于“视图模型”的技术。此外，您正在将

Text

属性绑定到时区，而不是时间，因此当

Text

属性更改时，WPF想要更新的实际上是组合框选择，而不是时间本身

您需要做的第一件事是，不要让控件相互引用，而是创建一个表示要显示的实际状态的视图模型类，然后将其用于窗口中的

DataContext

，将适当的属性绑定到特定控件

这些属性是什么？根据你的描述，你实际上只有四个：1）实际时间，2）到4）你想要处理的三个时区

比如说：

class ViewModel : INotifyPropertyChanged
{
    // The actual time. Similar to the "timeAll" field you have in the code now
    // Should be kept in UTC
    private DateTime _time;

    // The three selected TimeZoneInfo values for the combo boxes
    private TimeZoneInfo _timeZone1;
    private TimeZoneInfo _timeZone2;
    private TimeZoneInfo _timeZone3;

    public DateTime Time
    {
        get { return _time; }
        set { UpdateValue(ref _time, value); }
    }

    public TimeZoneInfo TimeZone1
    {
        get { return _timeZone1; }
        set { UpdateValue(ref _timeZone1, value); }
    }

    public TimeZoneInfo TimeZone2
    {
        get { return _timeZone2; }
        set { UpdateValue(ref _timeZone2, value); }
    }

    public TimeZoneInfo TimeZone3
    {
        get { return _timeZone3; }
        set { UpdateValue(ref _timeZone3, value); }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void UpdateValue<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
    {
        if (!object.Equals(field, value))
        {
            field = value;
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}

class TimeConverter : IMultiValueConverter
{
    public string Format { get; set; }

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        DateTime utc = (DateTime)values[0];
        TimeZoneInfo tzi = (TimeZoneInfo)values[1];

        return tzi != null ? TimeZoneInfo.ConvertTime(utc, tzi).ToString(Format) : Binding.DoNothing;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        string timeText = (string)value;
        DateTime time;

        if (!DateTime.TryParseExact(timeText, Format, null, DateTimeStyles.None, out time))
        {
            return new object[] { Binding.DoNothing, Binding.DoNothing };
        }

        ComboBox comboBox = (ComboBox)parameter;
        TimeZoneInfo tzi = (TimeZoneInfo)comboBox.SelectedValue;

        return new object[] { TimeZoneInfo.ConvertTime(time, tzi, TimeZoneInfo.Utc), Binding.DoNothing };
    }
}

XAML看起来像这样：

class ViewModel : INotifyPropertyChanged
{
    // The actual time. Similar to the "timeAll" field you have in the code now
    // Should be kept in UTC
    private DateTime _time;

    // The three selected TimeZoneInfo values for the combo boxes
    private TimeZoneInfo _timeZone1;
    private TimeZoneInfo _timeZone2;
    private TimeZoneInfo _timeZone3;

    public DateTime Time
    {
        get { return _time; }
        set { UpdateValue(ref _time, value); }
    }

    public TimeZoneInfo TimeZone1
    {
        get { return _timeZone1; }
        set { UpdateValue(ref _timeZone1, value); }
    }

    public TimeZoneInfo TimeZone2
    {
        get { return _timeZone2; }
        set { UpdateValue(ref _timeZone2, value); }
    }

    public TimeZoneInfo TimeZone3
    {
        get { return _timeZone3; }
        set { UpdateValue(ref _timeZone3, value); }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void UpdateValue<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
    {
        if (!object.Equals(field, value))
        {
            field = value;
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}

class TimeConverter : IMultiValueConverter
{
    public string Format { get; set; }

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        DateTime utc = (DateTime)values[0];
        TimeZoneInfo tzi = (TimeZoneInfo)values[1];

        return tzi != null ? TimeZoneInfo.ConvertTime(utc, tzi).ToString(Format) : Binding.DoNothing;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        string timeText = (string)value;
        DateTime time;

        if (!DateTime.TryParseExact(timeText, Format, null, DateTimeStyles.None, out time))
        {
            return new object[] { Binding.DoNothing, Binding.DoNothing };
        }

        ComboBox comboBox = (ComboBox)parameter;
        TimeZoneInfo tzi = (TimeZoneInfo)comboBox.SelectedValue;

        return new object[] { TimeZoneInfo.ConvertTime(time, tzi, TimeZoneInfo.Utc), Binding.DoNothing };
    }
}

这将在运行时正常工作。但是，由于在

ConverterParameter

赋值中使用了

{x:reference…}

，您将收到设计时uquot对象引用未设置为对象实例”错误消息。对一些人来说，这是一个小小的不便，但我觉得这是一个巨大的烦恼，我愿意去f