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稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

silverlight   发布时间：2022-05-04  发布网站：大佬教程  code.js-code.com
大佬教程收集整理的这篇文章主要介绍了稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

概述

  [源码下载] 稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和fallBACkValue, CollectionViewsource 作者： webabcd 介绍 Silverlight 4.0 绑定相关的增强： DependencyObject Binding - 新增了
  [源码下载]

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定,索引器绑定,StringFormat,TargetNullValue和fallBACkValue,CollectionViewsource

作者： webabcd
介绍
Silverlight 4.0 绑定相关的增强：
  • DependencyObject Binding - 新增了对 DependencyObject 绑定的支持 
  • Indexer Binding - 新增了对索引器绑定的支持 
  • StringFormat - 指定绑定数据的显示格式 
  • TargetNullValue - 当绑定数据为 null 时所需要显示的值 
  • fallBACkValue - 当绑定失败（无法返回值）的时候所需要显示的值 
  • CollectionViewsource - 实现了 ICollectionView 的类，可以通过它对数据排序、筛选和分组 

在线DEMO
http://www.cnblogs.com/webabcd/archive/2010/08/09/1795417.html
示例
1、演示如何绑定到 DependencyObject
DependencyObjectBinding.xaml

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码 @H_502_48@
< navigation:Page  x:Class ="Silverlight40.binding.DependencyObjectBinding"  
           xmlns ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml/presentation"  
           xmlns:x ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml"  
           xmlns:d ="http://scheR_428_11845@as.microsoft.com/expression/blend/2008"
           xmlns:mc ="http://scheR_428_11845@as.openxmlformats.org/markup-compatibility/2006"
           xmlns:navigation ="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           title ="DependencyObjectBinding Page" >
     < Grid  x:Name ="LayoutRoot" >
         < StackPanel  HorizontalAlignment ="Left" >

             <!--  
                Silverlight 3.0 支持绑定到 FrameworkElement 
                    textBox 继承自 FrameworkElement
             -->
             < TextBox  Text =" {Binding ELEMENTNAME=slider, Path=value} "   />

             <!--  
                Silverlight 4.0 中新增了对 DependencyObject 绑定的支持
                    rotateTransform 继承自 DependencyObject
             -->
             < Rectangle  Width ="100"  Height ="100"  renderTransformOrigin ="0.5, 0.5"  Fill ="Red" >
                 < Rectangle.RenderTransform >
                     < RotateTransform  Angle =" {Binding ELEMENTNAME=slider, Path=value} "   />
                 </ Rectangle.RenderTransform >
             </ Rectangle  >

             < Slider  Name ="slider"  Height ="20"  Minimum ="0"  Maximum ="360"   />

         </ StackPanel >
     </ Grid >
</ navigation:Page >

2、演示如何绑定到索引器
IndexerBinding.xaml

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
< navigation:Page  x:Class ="Silverlight40.binding.IndexerBinding"  
           xmlns ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml/presentation"  
           xmlns:x ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml"  
           xmlns:d ="http://scheR_428_11845@as.microsoft.com/expression/blend/2008"
           xmlns:mc ="http://scheR_428_11845@as.openxmlformats.org/markup-compatibility/2006"
           xmlns:navigation ="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           title ="IndexerBinding Page" >
     < Grid  x:Name ="LayoutRoot" >

         <!--
            用于演示索引器的绑定
         -->
         < TextBlock  Name ="textBlock"  text =" {Binding Path=[3] } "   />

     </ Grid >
</ navigation:Page >

IndexerBinding.xaml.cs

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
/*
 * Silverlight 4.0 中新增了对索引器绑定的支持，索引的类型必须实现 IList
  */

using  System;
 using  System.Collections.Generic;
 using  System.Linq;
 using  System.Net;
 using  System.Windows;
 using  System.Windows.Controls;
 using  System.Windows.Documents;
 using  System.Windows.Input;
 using  System.Windows.Media;
 using  System.Windows.Media.Animation;
 using  System.Windows.Shapes;
 using  System.Windows.Navigation;

 namespace  Silverlight40.binding
{
     public   partial   class  indexerBinding : Page
    {
         public  indexerBinding()
        {
            initializeComponent();
        }

         protected   override   void  OnNavigatedTo(NavigationEventArgs E)
        {
            List < String >  list  =   new  List < String > ();
             for  ( int  i  =   0 ; i  <   10 ; i ++ )
            {
                list.Add( " 索引： "   +  i.ToString());
            }

            textBlock.DataCo@R_262_10443@t  =  list;
        }
    }
}

3、演示在绑定时使用 StringFormat 来指定数据的显示格式
StringFormat.xaml

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
< navigation:Page  x:Class ="Silverlight40.binding.StringFormat"  
           xmlns ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml/presentation"  
           xmlns:x ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml"  
           xmlns:d ="http://scheR_428_11845@as.microsoft.com/expression/blend/2008"
           xmlns:mc ="http://scheR_428_11845@as.openxmlformats.org/markup-compatibility/2006"
           xmlns:navigation ="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           title ="StringFormat Page" >
     < Grid  x:Name ="LayoutRoot" >

         <!--
            StringFormat - 指定绑定数据的显示格式
         -->
         < TextBlock  Name ="textBlock"  text =" {Binding StringFormat='yyyy-MM-dd HH:mm:ss'} "   />
        
     </ Grid >
</ navigation:Page >

StringFormat.xaml.cs

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
using  System;
 using  System.Collections.Generic;
 using  System.Linq;
 using  System.Net;
 using  System.Windows;
 using  System.Windows.Controls;
 using  System.Windows.Documents;
 using  System.Windows.Input;
 using  System.Windows.Media;
 using  System.Windows.Media.Animation;
 using  System.Windows.Shapes;
 using  System.Windows.Navigation;

 namespace  Silverlight40.binding
{
     public   partial   class  StringFormat : Page
    {
         public  StringFormat()
        {
            initializeComponent();
        }

         protected   override   void  OnNavigatedTo(NavigationEventArgs E)
        {
            textBlock.DataCo@R_262_10443@t  =  datetiR_428_11845@e.Now;
        }
    }
}

4、演示 TargetNullValue 和 fallBACkValue 的效果
TargetNullValuefallBACkValue.xaml

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
< navigation:Page  x:Class ="Silverlight40.binding.TargetNullValuefallBACkValue"  
           xmlns ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml/presentation"  
           xmlns:x ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml"  
           xmlns:d ="http://scheR_428_11845@as.microsoft.com/expression/blend/2008"
           xmlns:mc ="http://scheR_428_11845@as.openxmlformats.org/markup-compatibility/2006"
           xmlns:navigation ="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           title ="TargetNullValuefallBACkValue Page" >
     < Grid  x:Name ="LayoutRoot" >
         < StackPanel  HorizontalAlignment ="Left"  NAME ="stackPanel" >

             <!--
                fallBACkValue - 当绑定失败（无法返回值）的时候所需要显示的值
             -->
             < TextBlock  Text =" {Binding Path=xxx, fallBACkValue='绑定失败时的默认值'} "   />

             <!--
                TargetNullValue - 当绑定数据为 null 时所需要显示的值
             -->
             < TextBlock  Text =" {Binding TargetNullValue='绑定返回值为 null'} "   />

         </ StackPanel >
     </ Grid >
</ navigation:Page >

TargetNullValuefallBACkValue.xaml.cs

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
using  System;
 using  System.Collections.Generic;
 using  System.Linq;
 using  System.Net;
 using  System.Windows;
 using  System.Windows.Controls;
 using  System.Windows.Documents;
 using  System.Windows.Input;
 using  System.Windows.Media;
 using  System.Windows.Media.Animation;
 using  System.Windows.Shapes;
 using  System.Windows.Navigation;

 namespace  Silverlight40.binding
{
     public   partial   class  TargetNullValuefallBACkValue : Page
    {
         public  TargetNullValuefallBACkValue()
        {
            initializeComponent();
        }

         protected   override   void  OnNavigatedTo(NavigationEventArgs E)
        {
            stackPanel.DataCo@R_262_10443@t  =   null ;
        }
    }
}

5、演示 CollectionViewsource 的应用
Product.cs

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
using  System;
 using  System.Net;
 using  System.Windows;
 using  System.Windows.Controls;
 using  System.Windows.Documents;
 using  System.Windows.Ink;
 using  System.Windows.Input;
 using  System.Windows.Media;
 using  System.Windows.Media.Animation;
 using  System.Windows.Shapes;

 namespace  Silverlight40.binding
{
     //  实体类
     public   class  Product
    {
         public   int  ProductId {  get ;  set ; }
         public   String  NAME {  get ;  set ; }
         public   String  Category {  get ;  set ; }
    }
}

ProductCollection.cs

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
using  System;
 using  System.Net;
 using  System.Windows;
 using  System.Windows.Controls;
 using  System.Windows.Documents;
 using  System.Windows.Ink;
 using  System.Windows.Input;
 using  System.Windows.Media;
 using  System.Windows.Media.Animation;
 using  System.Windows.Shapes;

 using  System.Collections.Generic;

 namespace  Silverlight40.binding
{
     public   class  ProductCollection : List < Product >
    {
        
    }
}

CollectionViewsource.xaml

稳扎稳打Silverlight(50) - 4.0绑定之DependencyObject绑定, 索引器绑定, StringFormat, TargetNullValue和FallbackValue,

代码
< navigation:Page  x:Class ="Silverlight40.binding.CollectionViewsource"  
           xmlns ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml/presentation"  
           xmlns:x ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml"  
           xmlns:d ="http://scheR_428_11845@as.microsoft.com/expression/blend/2008"
           xmlns:mc ="http://scheR_428_11845@as.openxmlformats.org/markup-compatibility/2006"
           xmlns:navigation ="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           xmlns:sdk ="http://scheR_428_11845@as.microsoft.com/winfx/2006/xaml/presentation/sdk"
           xmlns:c ="clr-namespace:System.ComponentModel;assembly=System.Windows"
           xmlns:local ="clr-namespace:Silverlight40.binding"
           title ="CollectionViewsource Page" >
     < Grid  x:Name ="LayoutRoot" >

         < Grid.resources >
             < local:ProductCollection  x:Key ="products" >
                 < local:Product  ProductId ="1"  NAME ="abc"  Category ="CategoryA"   />
                 < local:Product  ProductId ="2"  NAME ="xyz"  Category ="CategoryA"   />
                 < local:Product  ProductId ="3"  NAME ="webabcd"  Category ="CategoryB"   />
             </ local:ProductCollection >

             <!--
                CollectionViewsource - 实现了 ICollectionView 的类，可以通过它对数据排序、筛选和分组
                    CollectionViewsource.sortDescriptions - 指定排序方式
                        PropertyName - 指定排序的字段
                        Direction - 指定按升序还是降序排序
                    CollectionViewsource.GroupDescriptions - 指定分组方式
                        PropertyName - 指定分组的字段
                        StringComparison - 指定是否区分大小写等
             -->
             < CollectionViewsource  x:Name ="datasource"  source =" {Staticresource products} " >
                 < CollectionViewsource.sortDescriptions >
                     < c:SortDescription  PropertyName ="Name"  Direction ="Descending"   />
                 </ CollectionViewsource.sortDescriptions >
                 < CollectionViewsource.GroupDescriptions >
                     < PropertyGroupDescription  PropertyName ="Category"  StringComparison ="CurrentCultureIgnoreCase"   />
                 </ CollectionViewsource.GroupDescriptions >
             </ CollectionViewsource >
         </ Grid.resources >

         < sdk:DataGrid  Itemssource =" {Binding source={Staticresource datasourcE}} "   />

     </ Grid >
</ navigation:Page >

OK
[源码下载]

大佬总结

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