Windows Phone MultiBinding ：Cimbalino Toolkit-白红宇

本文转自 sun8134 博客园博客，原文链接： http://www.cnblogs.com/sun8134/p/3186066.html ，如需转载请自行联系原作者

这个有啥用呢，引用下MSDN的例子：

MultiBinding allows you to bind a binding target property to a list of source properties and then apply logic to produce a value with the given inputs. This example demonstrates how to use MultiBinding.

In the following example, NameListData refers to a collection of PersonName objects, which are objects that contain two properties, firstName andlastName. The following example produces a that shows the first and last names of a person with the last name first.

ConverterParameter="FormatLastFirst">

public class NameConverter : IMultiValueConverter

public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)

string name;

switch ((string)parameter)

case "FormatLastFirst":

name = values[1] + ", " + values[0];

break;

case "FormatNormal":

default:

name = values[0] + " " + values[1];

break;

return name;

public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)

string[] splitValues = ((string)value).Split(' ');

return splitValues;

可惜在wp中这个被砍掉了

想要 MultiBinding 需要自己来实现（方法见高手博客：）

当然也有一个稍微简单点的方法，使用Cimbalino Windows Phone Toolkit（），Cimbalino Toolkit 的作者为我们提供了一个MultiBindingBehavior，可以比较方便的实现 MultiBinding

下面看一个实例把，这里我们模拟一个显示学生各科成绩的应用，在应用中有一个ListPicker，应用会根据ListPicker的值来作为阈值，对成绩的颜色进行修改，下面是实现:

我们先新建一个wp工程（7.1，8.0都行，Cimbalino toolkit is compatible with the and ，这里我用7.1的，主要是机器不行，8.0的模拟器太卡…）

添加成绩类：

namespace PhoneIValueConverterMultibinding1

public class Score

public string name { get; set; }

public int number { get; set; }

在工程中添加Cimbalino Windows Phone Toolkit

然后定义我们的颜色转换类（由于我没用双向绑定，所以没写ConvertBack…）：

using System;

using System.Windows.Media;

using System.Globalization;

using Cimbalino.Phone.Toolkit.Converters;

namespace PhoneIValueConverterMultibinding1

public class ColorChange : MultiValueConverterBase

public override object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)

if (values.Length < 2)

return new SolidColorBrush(Colors.White);

if ((values[0] != null) && (values[1] != null))

//根据输入，判断返回值

try

int limitnumber = System.Convert.ToInt32((string)values[0]);

int studentscore = (int)values[1];

if (limitnumber < studentscore)

return new SolidColorBrush(Colors.Red);

else

return new SolidColorBrush(Colors.Green);

catch (FormatException)

return new SolidColorBrush(Colors.White);

catch (Exception)

return new SolidColorBrush(Colors.White);

else

return new SolidColorBrush(Colors.White);

public override object[] ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

throw new NotImplementedException();

然后在xaml里添加引用：

xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

xmlns:Local="clr-namespace:PhoneIValueConverterMultibinding1"

xmlns:cimbalinoBehaviors="clr-namespace:Cimbalino.Phone.Toolkit.Behaviors;assembly=Cimbalino.Phone.Toolkit"

添加ListPicker

添加页面资源

然后添加绑定的listbox，并在其中添加MultiBindingBehavior ，因为我们要改变的是文字的颜色，所以设置PropertyName="Foreground"

最后数据绑定：

ObservableCollection
     
       StudentScore = new ObservableCollection
      
       ();

private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)

StudentScore.Add(new Score { name = "语文", number = 55 });

StudentScore.Add(new Score { name = "数学", number = 66 });

StudentScore.Add(new Score { name = "英语", number = 76 });

StudentScore.Add(new Score { name = "物理", number = 72 });

StudentScore.Add(new Score { name = "化学", number = 97 });

StudentScore.Add(new Score { name = "生物", number = 86 });

StudentScore.Add(new Score { name = "地理", number = 68 });

StudentScore.Add(new Score { name = "历史", number = 95 });

StudentScore.Add(new Score { name = "政治", number = 39 });

private void listpicker1_SelectionChanged(object sender, SelectionChangedEventArgs e)

if (listpicker1 != null)

if (listpicker1.SelectedIndex != -1)

lb1.ItemsSource = StudentScore;

看看效果：

最后说下Ms强烈建议不要在复杂绑定中是使用Converter

另外还有许多其他的功能

大家可以试试

源码：

参考：