1.作用：可以將源數(shù)據(jù)和目標(biāo)數(shù)據(jù)之間進行特定的轉(zhuǎn)化，

2.定義轉(zhuǎn)換器，需要繼承接口IValueConverter

[ValueConversion(typeof(int), typeof(string))] public class ForeColorConverter : IValueConverter {//源屬性傳給目標(biāo)屬性時，調(diào)用此方法ConvertBackpublic object Convert(object value, Type targetType, object parameter, CultureInfo culture){int c = System.Convert.ToInt32(parameter);if (value == null)throw new ArgumentNullException("value can not be null");int index = System.Convert.ToInt32(value);if (index == 0)return "Blue";else if (index == 1)return "Red";elsereturn "Green";}//目標(biāo)屬性傳給源屬性時，調(diào)用此方法ConvertBackpublic object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture){return null;} }　

public ValueConversionAttribute(Type sourceType, TypetargetType)：指定源屬性類型和目標(biāo)屬性類型

Convert：會進行源屬性傳給目標(biāo)屬性的特定轉(zhuǎn)化

ConvertBack：會進行目標(biāo)屬性傳給源屬性的特定轉(zhuǎn)化

加粗樣式參數(shù)parameter：對應(yīng)Binding的ConverterParameter屬性

3.使用轉(zhuǎn)換器

（1）引用轉(zhuǎn)換器所在的命名空間

xmlns:local1="clr-namespace:WpfTest.View"

（2）定義資源

<Window.Resources><local1:ForeColorConverter x:Key="foreColor"></local1:ForeColorConverter> </Window.Resources>

（3）定義屬性

private int status = 0; public int Status {get => status; set { status = value; RaisePropertyChanged("Status"); }}

（4）綁定屬性，添加轉(zhuǎn)換器

<Grid><Label HorizontalAlignment="Left" Height="23" Margin="243,208,0,0" Content="這里哦" Foreground="{Binding Status,Converter={StaticResource foreColor},Mode=OneWay}" VerticalAlignment="Top" Width="120"/><TextBox x:Name="tbName" HorizontalAlignment="Left" Height="23" Margin="243,160,0,0" TextWrapping="Wrap" Text="{Binding Status,UpdateSourceTrigger=LostFocus,Mode=OneWayToSource}" VerticalAlignment="Top" Width="120"/><Button Content="Button" HorizontalAlignment="Left" Margin="389,160,0,0" VerticalAlignment="Top" Width="75"/> </Grid>

4.效果

其它示例：
1、定義轉(zhuǎn)換器，需要繼承接口IValueConverter

public class LongToBoolConverter : System.Windows.Data.IValueConverter{public object Convert(object value, Type targetType, object parameter, CultureInfo culture){if (value == null){return new NotImplementedException();}double vv = (string)value == "" ? 0 : double.Parse((string)value);return vv > 8 ? true : false;}public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture){throw new NotImplementedException();}}

2、定義資源

<bandit:BanditWindow.Resources><localHelper:LongToBoolConverter x:Key="LongToBoolConverter"/> </bandit:BanditWindow.Resources>

3、數(shù)據(jù)綁定

<TextBox Width="200" Height="50" Name="txtBoxName" VerticalContentAlignment="Center"> <TextBox.Style><Style TargetType="TextBox"><Style.Triggers><DataTrigger Binding="{Binding ElementName=txtBoxName,Path=Text,Converter={StaticResource LongToBoolConverter}}" Value="True" ><Setter Property="Background" Value="Green"></Setter></DataTrigger><DataTrigger Binding="{Binding ElementName=txtBoxName,Path=Text,Converter={StaticResource LongToBoolConverter}}" Value="False" ><Setter Property="Background" Value="Red"></Setter></DataTrigger></Style.Triggers></Style></TextBox.Style></TextBox>

4、效果展示：

總結(jié)

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