WPF-数据转换器

一、单值转换器

1.不传参数

转换器 当Value值大于100时返回红色

public class DataConverter : IValueConverter{/// <summary>/// 表示从源到目标数据转换/// </summary>/// <param name="value">数据源的值</param>/// <param name="targetType">目标类型 根据目标类型进行不同转换</param>/// <param name="parameter">参数</param>/// <param name="culture">本地国际化时使用</param>/// <returns></returns>public object Convert(object value, Type targetType, object parameter,  CultureInfo culture){if (int.Parse(value.ToString()) > 100)return Brushes.Red;return Brushes.Black;}/// <summary>/// 表示从目标到源头的数据转换 /// </summary>/// <param name="value"></param>/// <param name="targetType"></param>/// <param name="parameter"></param>/// <param name="culture"></param>/// <returns></returns>public object ConvertBack(object value, Type targetType, object parameter,  CultureInfo culture){throw new NotImplementedException();}}

2.传参数Parameter

选则男或女后 后台的绑定值也发生变化

public class GenderConverter : IValueConverter
{public object Convert(object value, Type targetType, object parameter,  CultureInfo culture){//第一次 男标签触发 value=1 p=1//第二次 女标签触发 value=2 p=2if (value.ToString() == parameter.ToString())return true;return false;}//值返回的处理public object ConvertBack(object value, Type targetType, object parameter,  CultureInfo culture){return parameter;}
}

二、多值转换器

使用MultiBinding绑定多值，转换器使用数组接收

<Window.Resources><local:TextMulti x:Key="TextMulti"/>
</Window.Resources>
<Grid><TextBox x:Name="tex1"/><TextBox x:Name="tex2"/><TextBox x:Name="tex3"/><TextBox x:Name="tex4"><TextBox.Text><MultiBinding Converter="{StaticResource TextMulti}"><Binding ElementName="tex1" Path="Text" Mode="TwoWay"/><Binding ElementName="tex2" Path="Text" Mode="TwoWay"/><Binding ElementName="tex3" Path="Text" Mode="TwoWay"/></MultiBinding></TextBox.Text></TextBox>
</Grid>
public class TextMulti:IMultiValueConverter
{public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture){return values[0] + " " + values[1] + " " + values[2];}public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture){return value.ToString().Split(' ');}
}