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Windows Phone MultiBinding ：Cimbalino Toolkit

發布時間：2024/4/13 windows 42 豆豆

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在WPF和WIN8中是支持MultiBinding

這個有啥用呢，引用下MSDN的例子http://msdn.microsoft.com/en-us/library/system.windows.data.multibinding.aspx：

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 and lastName. The following example produces a TextBlock that shows the first and last names of a person with the last name first.

<TextBlock Name="textBox2" DataContext="{StaticResource NameListData}"> <TextBlock.Text> <MultiBinding Converter="{StaticResource myNameConverter}" ConverterParameter="FormatLastFirst"> <Binding Path="FirstName"/> <Binding Path="LastName"/> </MultiBinding> </TextBlock.Text> </TextBlock> 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中這個被砍掉了

想要 MultiBinding 需要自己來實現（方法見高手博客：http://www.devdiv.com/wp_amp_win_-blog-55433-51080.html）

當然也有一個稍微簡單點的方法，使用Cimbalino Windows Phone Toolkit（http://cimbalino.org/），Cimbalino Toolkit 的作者為我們提供了一個MultiBindingBehavior，可以比較方便的實現 MultiBinding

下面看一個實例把，這里我們模擬一個顯示學生各科成績的應用，在應用中有一個ListPicker，應用會根據ListPicker的值來作為閾值，對成績的顏色進行修改，下面是實現:

我們先新建一個wp工程（7.1，8.0都行，Cimbalino toolkit is compatible with the Windows Phone SDK 7.1.x and Windows Phone 8.0，這里我用7.1的，主要是機器不行，8.0的模擬器太卡…）

添加成績類：

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

然后定義我們的顏色轉換類（由于我沒用雙向綁定，所以沒寫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)) { //根據輸入，判斷返回值 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

<toolkit:ListPicker Header="成績閾值" Name="listpicker1" SelectionChanged="listpicker1_SelectionChanged"> <toolkit:ListPickerItem Content="50" /> <toolkit:ListPickerItem Content="60" /> <toolkit:ListPickerItem Content="70" /> <toolkit:ListPickerItem Content="80" /> <toolkit:ListPickerItem Content="90" /> </toolkit:ListPicker>

添加頁面資源

<phone:PhoneApplicationPage.Resources><Local:ColorChange x:Key="ColorConverter" /></phone:PhoneApplicationPage.Resources>

然后添加綁定的listbox，并在其中添加MultiBindingBehavior ，因為我們要改變的是文字的顏色，所以設置PropertyName="Foreground"

最后數據綁定：

ObservableCollection<Score> StudentScore = new ObservableCollection<Score>(); ? private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e) { StudentScore.Add(new Score { name = "語文", number = 55 }); StudentScore.Add(new Score { name = "數學", number = 66 }); StudentScore.Add(new Score { name = "英語", number = 76 }); StudentScore.Add(new Score { name = "物理", number = 72 }); StudentScore.Add(new Score { name = "化學", 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 = "歷史", 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：

最后說下Ms強烈建議不要在復雜綁定中是使用Converter

另外Cimbalino Windows Phone Toolkit還有許多其他的功能

大家可以試試

源碼：

參考：

http://msdn.microsoft.com/en-us/library/system.windows.data.multibinding.aspx

https://github.com/Cimbalino/Cimbalino-Phone-Toolkit

http://www.pedrolamas.com/2013/05/17/cimbalino-windows-phone-toolkit-multibindingbehavior/

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